AIR TO WATER ALL IN ONE HEAT PUMP TO WATER ALL IN ONE HEAT PUMP 2 metran Contents 7. MAINTAINANCE & SERVICE INFORMATION 10 7.1 The Water Tank 10 7.2 Air Evaporator Coils

CODE:MK3045/MK3058

metran

AIR TO WATER ALL IN ONE HEAT PUMP

Installation & Instruction Manual


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Contents

1. ONE OF THE WORLD'S MOST ENERGY EFFICIENT METHODS OF WATER

HEATING PRODUCTION.................................................................................. 3

2. FEATURES OF YOUR metran HEAT PUMP WATER HEATER............................. 3

2.1 With dynamic cycle flow heating system................................................... 3

2.2 High efficient and energy saving................................................................ 3

2.3 Safe, reliable and long operating life ,good durability................................. 4

2.4 Simple installation and convenience to use................................................ 4

2.5 Wide application to save your money......................................................... . 4

2.6 Model Nomenclature ................................................................................. 4

3. SPECIFICATIONS & DIMENSIONS.................................................................... 5

3.1 Technical parameters for the main unit................................................. 5

3.2 Main unit appearance and mounting dimension..................................... 6

4. INSTALLATION DETAILS................................................................................. . 6

4.1 General Installation Requirements............................................................. 6

4.2 Air Flow...................................................................................................... 6

4.3 Evaporator Drain........................................................................................ 6

4.4 Pressure & Temperature Relief Valve (PTR)................................................ 7

4.5 Expansion Control Valve (ECV).................................................................. 7

4.6 Cold Water Connection.............................................................................. 7

4.7 Pressure Reducing Valve........................................................................... 8

4.8 Suitability For Installation In Frost Areas................................................... 8

4.9 Draining Of Tank................................. ....................................................... 8

4.10 Hot Water Connection.............................................................................. 8

4.11 Tempering Valves..................................................................... ................ 8

4.12 Electrical Connection.............................................................................. 8

4.13 Caution Regarding Drilling Metal Jacket.................................................. 9

5. OPERATING INSTRUCTIONS........................................................................... 9

5.1 Filling The Water Heater............................................................................. 9

5.2 Air Expelling Of The Circulating Water Pump.......................... .................... 9

5.3 Water Quality............................................................................................. 9

5.4 Caution When Left Operating But Unused.................................................. 9

6: SAFETY INFORMATION.................................................................................. .10

6.1 Safety Devices.......................................................................................... .10

6.2 Important Note Regarding PTR Valve........................................................ . 10


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Contents

7. MAINTAINANCE & SERVICE INFORMATION................................................... . 10

7.1 The Water Tank.......................................................................................... 10

7.2 Air Evaporator Coils................................................................................. . 10

7.3 Sacrificial Anode....................................................................................... 10

7.4 Service Caution before Any Work Is Carried Out...................................... . 11

7.5 Thermal Overload (Incorporated in Digital Controller).............................. . 11

7.6 Routine Service.................................................................................. ...... 11

7.6a Access & Removal of Sacrificial Anode................................................. . 11

7.6b Flushing of Water Tank.......................................................................... . 11

8. OPERATION & ADJUSTMENT OF THE DIGITAL CONTROLLER...................... 11

8.1 Mounting and fixing method of the remote controller......................... . 11

8.2 Functional illustration of the digital controller....................................... . 12

8.3 Uses of the digital controller................................................................................ 12

8.3a ON/OFF control...................................................................................................... 12

8.3b Effective for electric heating model..................................................................... 12

8.3c Timed ON/OFF setting....................................................................... . 13

8.3d Cancellation of timing setting operation............................................................. 13

8.3e Keyboard locking / unlocking operation............................................................ 13

8.3f Parameter setting.......................................................................... ...... 13

8.4 Operation data setting........................................................................... . 15

8.5 Time Delay on Start................................................................................... . 16

9. RECOGNITION OF ABNORMAL OPERATION................................................ 16

9.1 Pressure & Temperature Relief Valve Running......................................... . 16

9.1a Continuous Trickle............................................................................. .. 16

9.1b Steady Flow......................................................................................... . 16

9.2 No Hot Water............................................................................................ . 16

10. SYSTEM MALFUNCTION SCHEDULE............................................................... . 17

11. JUDGEMENT AND SOLUTION OF MALFUNCTIONS...................................... . 18

12. WIRING DIAGRAM.............................................................. ............................ 18


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metran ENERGY-SAVING HEAP PUMP

1. ONE OF THE WORLD'S MOST ENERGY EFFICIENT METHODS OF

WATER HEATING PRODUCTION We thank you for your decision to purchase a MACON Energy-Saving Heat Pump Water

Heater, which will reward you with many years of low energy hot water production.

metran Cooling & Heating Energy-Saving Equipment Co. Ltd. designs and manufactures

energy efficient Heat Pump water heaters. The simple way to explain the advantage of this heater

is that it saves energy in any weather, even at during the night & rainy or cloudy periods.

The All in one heat pump is a Compact model (heat pump and water storage tank) with

breakthrough technology- dynamic cycle flow & externally wrapped tank heating system; and for

every 1kW of electrical energy consumed, they are able to generate up to 3.60kW of heat energy into the

water when operated at 20°c ambient. The system can save between 75% & 80% of conventional hot

water energy utilization; greatly assisting in the worldwide greenhouse gas reduction campaign.

As the name indicates, a Heat Pump is a machine that pumps heat from a low temperature

source to a high temperature reservoir. It has a cold side to absorb heat at low temperatures and

a hot side to deliver heat at high temperatures.

The metran all in one heat pump has series of product with different volumes to meet different

demands by ordinary households, factory, school , hotels, restaurants, hospitals, beauty salons,

laundries and so on , and it will work in temperatures from as low as -10 to + 43 during day as

well as the night time very efficiently without any need for electrical boosting.

metran water heaters can save energy in countries all around the world. They are used in all

weather conditions for domestic, commercial and industrial applications, and are regarded as the

most energy efficient and practical water heater available.

This is your assurance that you have purchased one of the highest quality water heaters on

the market, one that will provide continuous hot water for all your needs safely, economically,

and for many years to come.

2. FEATURES OF YOUR metran HEAT PUMP WATER HEATER

2.1 With dynamic cycle flow heating system

A metran all in one heat pump is a Compact model (heat pump and water storage tank) with

cycle heating type & with externally wrapped condenser hot water system, that is different from

the traditional all in one heat pump. On the principles, we heat the water by a dynamic cycle flow

system, whereby heat from the ambient air is absorbed by a refrigerant gas-R134a ,this

refrigeration gas is then compressed using a small compressor which causes the gas's

temperature and pressure to be raised, and the high temperature gas will go into a free-standing

double layer double-tube heat exchanger, or through the externally wrapped copper condenser .

The water in the tank flows from the tank into this heat exchanger and b a c k to the tank again.

The alternative version circulates the super heated refrigerant vapor through the externally

condenser that is wrapped around the outside of the storage tank therefore providing the heat

pump with higher efficiency making the COP higher.

2.2 High efficient and energy saving

Besides the advantage of the principle structure, the heat exchanger is an integrated

accessory and is installed in the heat pump to maintain the heat and temperature, and what's more

metran all in one heat pump use AC single inlet type centrifugal blower instead of normal fan

blade, which make the air heat exchange greatly increased which in turn increases efficiency.


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2.3 Safe, reliable and long operating life, good durability

The metran all in one heat pump is fully welded steel tank with double-tube heat exchanger have 2

layers of copper tube, so even if the inner tube broke, the refrigerant also will not touch the water ,

because it's a integrity accessories, so you can change it any time. All the major accessories in the

heat pump water heater, such as compressor and four-way valve are high-quality products

manufactured by world-famous factories. The outer shell is super-thick coated steel plate resistant

to corrosion so as to guarantee high quality of the product with a life span as long as more than ten to

15 years, which is generally longer than the life span of other types of water heater.

2.4 Simple installation and convenience to use

To install metran all in one heat pump only requires the collection of the inlet and outlet pipes

and the electrical connection and the system will provide 60°C hot water within a very short

time after the initial preheating period.

2.5 Wide application to save your money This all in one heat pump has a series of product with different volumes to meet different

demands by ordinary households, factory, school , hotels, restaurants, hospitals, beauty salons,

laundries and so on , and it will work in temperatures from as low as -10 to + 43 during day

and night very efficiently without need boosting. The product is b capable of saving energy

efficiently; even in cold colder climatic conditions.

System principles-Dynamic cycle flow heating system

Compressor

High temperature

Hot water

Outdoor air intake Air exchanger

Hydrothermal exchanger

Low temperature

Expansion valve

Water tank Cold water

2.6 Model Nomenclature

MA HR W - - Z A B - 27 0 ( )

Source medium

MA: Air source

MW: Ground source

Function of the unit

HR: heating

Energy exchange medium

A: Refrigerant

W: Water

The figure represents the horse power of unit

eg:010 means 1 horse power

Design alternative serial number

Tank capacity 270:270L

A: coil heating

B: circulating heating

A: Horizontal fan direction

B: Upward fan direction

C:Double air duct type

Z: Integrated type

W: Split type(indoor unit )


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3. SPECIFICATIONS & DIMENSIONS

3.1 Technical parameters for the main unit

Model MAHRW 010ZAB-270 010ZAB-340 S010ZAB-270 S010ZAB-340

Rated heating capacity

W 4100 4100 4100 4100

BTU/h 14000 14000 14000 14000

Input power W 1150 1150 1150 1150

Rated Current A 5.2 5.2 5.2 5.2

Max. Current A 6.5 6.5 6.5 6.5

Compressor starting current A 30 30 30 30

Auxiliary electric heating input power W 1500~3000 1500~3000

Solar installable installable

Power supply V/PH/Hz 220V~240V/1PH/50Hz

Compressor 24.7 cc/rev. Rotary

Max. Pressure of heat exchanger MPa 2.8 2.8 2.8 2.8

PTR valve setting

MPa 0.85 0.85 0.85 0.85

Suction pressure

MPa 0.15 0.15 0.15 0.15

Discharge pressure

MPa 2.74 2.74 2.74 2.74

Waterproof degree IPX4 IPX4 IPX4 IPX4

Water tank volume

L 270 340 270 340

Rated of hot water production

L/h 85 85 85 85

Water flow volume

m3/h 2.5 2.5 2.5 2.5

Max. working pressure

MPa 0.85 0.85 0.85 0.85

Rated water outlet temperature 60 60 60 60

Max. Water outlet temperature 70 70 70 70

Input/Output connection inch 3/4 3/4 3/4 3/4

Safety valve connection inch 3/4 3/4 3/4 3/4

Pressure & Temperature Relief Valve(PTR) inch 1/2 1/2 1/2 1/2

Noise dB(A) 50 50 50 50

Refrigerant gas type R134A

Operating temperature range -10~43 -10~43 -10~43 -10~43

Net dimension /H(mm) 700 1625 700 1875 700 1625 700 1875

Shipping dimension L/W/H(mm) 780/780/1670 780/780/1920 780/780/1670 780/780/1670

Net weight kg 100 106 101 107

Gross weight kg 108 116 109 117

Remarks: The technical parameters in this Manual are measured in the following working conditions:

outdoor dry bulb temperature 20 wet-bulb temperature 15 , water inlet temperature 20

and water outlet temperature 60 .


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Type A B C

MAHRW010ZAB-270 700 1595 1090

MAHRW010ZAB-340 700 1845 1340

MAHRWS010ZAB-270 700 1595 1090

MAHRWS010ZAB-340 700 1845 1340

3.2 Main unit appearance and mounting dimension

A

A

B

C 885mm

B

C 1135mm

30mm 30mm

4 INSTALLATION DETAILS

4.1 General Installation Requirements This water heater must be installed by a licensed tradesperson, and in accordance with

1). AS 3500.4, National Plumbing and Drainage Code, Part 4: Hot Water Supply Systems.

2). AS 3500.4.2, National Plumbing and Drainage Code, Part 4.2: Hot Water Supply Systems

acceptable solutions.

3). Other relevant Australian Standard, Industry or Local Water Supply regulations or codes for

mains pressure storage tanks.

4)The water heater will have to be installed in accordance with the requirements of

AS/NZS 3500.4 or, in New Zealand, NZBC G12 or other local Authority regulations. Note: This water heater is not suitable for pool heating or building heating.

Corrosion Protection

Fittings and the Shell Surface in contact with the water are to be materially compatible.

Sealants and / or Teflon plumbing tape should be used on potentially materially incompatible

fittings. This is to protect against possible electrolytic corrosion between the metals (where

moisture penetration could occur due to incorrectly or poorly sealed fittings).

4.2 Air Flow The heat pump extracts the required heat from air being drawn through their Fin Coil Evaporator.

This produces cold exhaust air as a by-product. In order for the heaters to operate efficiently, good

ventilation of the proposed location for the heat pump separate evaporator is required. This is to

provide warm air as a heat source and to remove the cold air being produced. The heat pump

therefore is best located externally; however a large double garage (minimum of 120 cubic meters)

may also be suitable.

4.3 Evaporator Drain During operation considerable amounts of condensate water will flow from the evaporator drain.

If allowed to simply flow out of the outlet, this water may pool below the unit and can cause

problems to both the water heater and area around it. The evaporator drain should be drained to

a suitable location. This can be accomplished with a length of hose or pipe but must not be

connected directly to the PTR valve or expansion valve drain.


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4.4 Pressure & Temperature Relief Valve (PTR) The Pressure and Temperature relief valve, which is supplied with the unit, must be fitted and

made accessible so that the release mechanism can be operated and, if required, the valve

replaced. The outlet of the PTR valve must be suitably drained to remove the water discharged

during the normal heating cycle. The valve thread is G1/2 /20mm and must be installed into the

connection point as indicated on the tank.

Warning:

A separate drain line must be run for this relief valve. It is not permitted to couple the drain lines

from the relief valve and evaporator into a single common line. The use of a tundish under the

evaporator drain with this then connected to the drain of the PTR valve is acceptable.

Following installation The valve lever MUST be operated AT LEAST ONCE A YEAR by the hot water tank owner to ensure that the water-ways are clear. Certain naturally occurring mineral deposits may adhere to the valve, rendering it inoperative. When manually operating the lever, water will discharge and precautions must be taken to avoid contact with hot water and to avoid water damage. BEFORE operating lever, check to see that a discharge line is connected to this valve directing the flow of hot water from the valve to a proper place of disposal otherwise personal injury may result. If no water flows, valve is inoperative. TURN OFF THE WATER HEATER AND CALL A PLUMBER IMMEDIATELY. This device is designed for emergency safety relief and shall not be used as an operating control.

IMPORTANT: INQUIRE WITH GOVERNING AUTHORITIES FOR LOCAL INSTALLATION

REQUIREMENTS AND FOLLOW THESE REGULATIONS CAREFULLY.

4.5 Expansion Control Valve (ECV) Where an Expansion Control Valve is fitted to the cold water supply, the ECV should be rated at

150kPa lower than the Pressure & Temperature Relief valve (PTR). It is a State requirement for

SA & QLD that an ECV be fitted on the cold water supply line between the non- return valve and

the water heater.

4.6 Cold Water Connection An approved isolating valve, approved non-return valve, line strainer (optional but

recommended), and union must be fitted between the supply main and the G3/4 /25mm socket

in the water heater. All fittings must be approved by the relevant Authority (as follow diagram)

Single Line >150mm

Power Cable

Non Return Valve

Water Connections

Isolating Valve

Cold Water Inlet

Pressure Limiting Valve

Line Strainer >300mm

>500mm

Expansion Control Valve(If Required)

Hot Water Outlet

Sacrificial anode

(Magnesium)

PTR Valve

Drain

metran

PTR Valve

Single Line

Power Cable

Water Connections

>500mm

tank temp. >300mm

>500mm

PTR Valve

Drain

>500mm


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4.7 Pressure Reducing Valve This water heater is designed for direct connection to a maximum water supply pressure of

600kpa. Where the mains pressure exceeds this or fluctuate beyond this pressure, a pressure-

limiting device (complying with AS1357) must be fitted in the cold-water supply line. This device

must be installed after the isolating valve and set at or below 500kPa (or 350kPa if a 600kPa

expansion control valve fitted). An ECV is fitted when the water supply has a tendency for form

scale. This type of water is referred to as scaling water because calcium carbonate is deposited

out of the water onto any hot metallic surface. The fitting of an ECV is mandatory in WA, SA and

some other areas of Australia as dictated by local regulations.

4.8 Suitability for Installation The R134a refrigerant used has a boiling point of 26 so there is no risk of damage to the

heat pump from frost. Performance may be reduced in very low temperatures but the system will

not be damaged by such climatic conditions. The unit should be installed at outdoor or open place

and installed base for concrete structure ,also can be use the angle steel bracket and add rubber

cushion on the ground or house roof for shockproof, and ensure the unit in a horizontal position.

4.9 Draining Of Tank Consideration should be given to the possible necessity of draining the tank at some point.

Draining of the tank can be accomplished by the connection of a hose to the cold water inlet and

running to a suitable drain. It will be necessary to disconnect the hot water outlet or PTR valve to

the expansion of water during heating and relieve any partial vacuum created as the water flows

out.

4.10 Hot Water Connection The hot water pipe should be connected to the G3/4”/ 25mm socket as shown in the Installation

Diagram. NOTE: Plugs are supplied with the water heater to plug off the inlet / outlet entries that

are not required. Ensure that adequate sealing tape is applied to the plugs for a tight, leak proof

seal.

4.11 Tempering Valves

Where a tempering valve is fitted on the hot water outlet of a metran (to reduce water

temperature to 50 as per the plumbing code) ONLY high performance valves suitable for Solar

type water heaters are recommended to be used. Standard tempering valves may not function

correctly.

4.12 Electrical Connection

metran water heaters are designed for single-phase 220/240V A.C supply only. A certified

electrician must carry out all electrical work according to the local supply authority regulations

and AS3000. A 15-amp circuit breaker must be installed at the power supply for the hot water unit.

A separate circuit breaker is recommended for each unit in the case of multiple installations. The

power connection rating is 220-240VAC 50Hz 15A. 60 Hz Models are also available on request.

It is not recommended to wire the system to an earth leakage circuit breaker. There is lot of

moisture present while in operation and this can lead to nuisance tripping.

The connection will require an approved, standard 240V 15A On / Off switch or Junction Box in

close proximity to the heater. The unit should be connected to Standard Domestic tariff. Off Peak

connection is NOT recommended for metran heat pump units. If the unit is connected to an Off

Peak tarrif, the minimum power availability must be at least 18 hours per day. The fitted power cord is not to be removed; this cord should be connected with the building wiring in an On / Off switch enclosure or Junction Box. Faulty wiring may void the warranty if damage has been sustained to the compressor or heat pump from such faulty or sub-standard wiring.


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Safety Notes

Note.1: This water heater is fitted with a thermostat and over-temperature energy cut-out (both

incorporated into the digital controller). Under no circumstances should the water heater be

operated without both of these devices being in the circuit. Only a qualified electrician or the

manufacturer should carry out replacement.

Note.2: If the supply cord is damaged, its local service agent or other similarly qualified person

must replace it in order to avoid hazard.

Caution: The water heater must be filled with water before turning on the electricity

4.13 Caution Regarding Drilling Metal Jacket This is extremely important and MUST be adhered to without exception!

DO NOT DRILL ANY HOLES IN OUTER METAL JACKET IT MAY BE DAMAGE TO WATER LINES MAY RESULT

5. OPERATING INSTRUCTIONS

5.1 Filling the Water Heater Open all hot water taps. Open isolating valve at the cold-water inlet and allow the water heater to

fill until water flows through the system. Close each hot water tap after the air is expelled from it’s

line.

5.2 Air Expelling Of the Circulating Water Pump before Power Up For the First Time After the system is filled with water, keep all the hot water taps and isolating valve at the cold-water inlet open to let the water flow out for a minute, then power up the unit (Or use the digital controller to push the button of ON/ OFF ) to operating unit, if the unit does not stop after 5 minutes, indicating the unit is operating normally, then close the all the hot water taps to let the heat pump start its initial start-up heating cycle. If not, Power off (Or use the digital controller to push button of the ON/ OFF ) , and open the hot water tap again for a minute to let the water flow out, then power up the unit (Or use the digital controller to push the button of ON/ OFF ) to operating unit, if the unit not stop during 5 minute, that means the unit normal operation, then close the all the hot water taps to let the heat pump work normally, Repeat the same process to let the air expelled from the water pump .

5.3 Water Quality

Your metran water heater has been manufactured to suit the water conditions of most

Australian metropolitan supplies. Please note that harsh water supplies can have a detrimental

effect on the water heater and its life expectancy. If you are unsure about your water quality you

can obtain information from your local water supply authority. The PH of water is 7.2--7.6 which is

better for human consumption.

By using the correct anode this water heater can be used in areas where the Total Dissolved

Solids (TDS) content of the water supply is up to 2500 mg/L. In areas where the TDS exceeds

750mg/L it is possible that the magnesium alloy anode (supplied in the heater) may become over

reactive. To alleviate this, the magnesium alloy anode should be replaced with an aluminum alloy

anode (Note: metran only supplies the anode in the vitreous enamel lined steel cylinder

products).

5.4 Caution When Left Operating but Unused If the water heater is left in an operating condition but unused for two weeks or more, a quantity of

hydrogen gas (which is highly flammable) may accumulate in the top of the water cylinder. To

dissipate this gas safely it is recommended that a hot tap be turned on for several minutes at a sink,

basin or bath, but not a dishwasher, clothes washer or other appliance. During this procedure there

must be no smoking, open flame or any other electrical appliance operating nearby. If hydrogen

gas is discharged through the tap it will probably make an unusual sound similar to air escaping.


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6. SAFETY INFORMATION 6.1 Safety Devices WARNING: For safe performance this water heater is fitted with:

1). Digital Controller. 2). A thermostat (connected to the digital controller) to manage water temperature. 3). A thermostat (connected to the digital controller) to manage compressor temperature. 4). A non self-setting thermal cut out (incorporated into the digital controller). 5). Combination Pressure & Temperature relief valve.

These devices must not be tampered with or removed. The water heater must not be operated unless each of these devices is fitted and in working

order. This appliance is not intended for use by persons (including children) with reduced physical,

sensory or mental capabilities, or lack of experience and knowledge, unless they have been given supervision or instruction concerning use of the appliance by a person responsible for their safety. Children should be supervised to ensure that they do not play with the appliance

6.2 Important Note Regarding PTR Valve The Pressure & Temperature relief valve should be checked for adequate performance or

replaced at intervals not exceeding 5 years, or less in areas where there is a high incidence of

water deposits. Providing there is some discharge from the relief valve during each heating cycle

there is no requirement to manually activate the release mechanism on the relief valve. There is

a possibility that manually opening the relief valve may allow contamination / grit etc to settle in

the valve seat causing continuous leakage. If the relief valve is operated manually it should be

done with care.

The Pressure & Temperature relief valve and the drain outlet pipe must not be sealed or blocked.

It is normal for small amounts of water to leak from the valve during each heating cycle.

DO NOT TURN ON POWER UNLESS THE TANK IS FULL OF WATER

7. MAINTAINANCE & SERVICE INFORMATION Your metran water heater is a completely sealed refrigeration system, similar to a household

refrigerator. The maintenance program to be employed on your metran is not much different to

that required for the maintenance of a standard electric water heater. However, metran warranty

may be void if any of the following conditions are not met or if the refrigeration lines or

components are damaged or altered in any unauthorized way.

7.1 The Water Tank The water tank must not be drilled or punctured. Drilled holes or punctures, may damage the

water pipes located in the water tank.

7.2 Air Evaporator Coils

metran water heaters use evaporator coils to extract heat from the air. The coil is extremely

efficient in warm humid weather; however, as temperatures drop to ten degrees or less the coil

will begin to collect ice. The coil has been designed with auto-defrost for the coil under such

conditions. The defrost is automatic and is managed by the digital controller. It is important that

the air inlet vents are kept clean. Restriction of air-inlet or outlet vents may void warranty if the

system has been damaged because of insufficient airflow.

7.3 Sacrificial Anode A sacrificial anode is fitted inside the vitreous enamel lined cylinder. Its purpose is to help protect

the cylinder from the corrosive effects of water. Normally, the sacrificial anode should be inspected

every fifth year and replaced if necessary. In areas where hard water or where poor quality water

conditions exist, the sacrificial anode must be inspected every second year. Replacement

anodes must meet metran quality specifications and must be appropriate for local water

conditions. The anode socket in the tank can be either a ½” or ¾” connection.


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7.4 Service Caution Before Any Work Is Carried Out Before any electrical components are inspected the System MUST be turned off at the power

switch / hot water circuit breaker. Do not touch wiring or any electrical components without

supervision or training to Australian (or equivalent) standards.

7.5 Thermal Overload (Incorporated in Digital Controller) All models are fitted with a digital controller for heat pump management. One function of the

digital controller is to initiate a shut down and lockout if the compressor reaches a temperature

of 105 . The system will not automatically restart from this. Turning the power off then back on

will also perform a reset.

7.6 Routine Service

7.6a Access & Removal of Sacrificial Anode

The anode can be accessed via the heat pump section, to remove.

1). Turn off power to the unit, cut into water valve, open PTR valve to release pressure on the system.

2). The anode head is now accessible and can be unscrewed with a suitable socket wrench.

3). Once unscrewed the anode can be drawn out through the flank of the tank / heat pump section.

4). The new anode can then be fitted and the heater reassembled.

7.6b Flushing of Water Tank

As with other hot water heater tanks, dissolved solids in the water or scale may accumulate in

the bottom of the water tank forming sludge. This is generally less of a problem with metran units

as no internal elements or burners are used.

If such sludge build-up does occur the following procedure can be followed to clean out the tank.

1). Turn Off power to the unit.

2). Turn Off water supply to the unit.

3). Remove the blanking plug (brass fitting) from the unused inlet (normally on the right hand side

for left hand connected tanks) the inlets are at the bottom of the tank about 300mm up from the

base.

4). Remove the blanking plug from the unused hot water outlet (normally on the right hand side

for left hand connected tanks) the outlets are at the top of the tank.

5). Allow the water to drain from tank, while the water is draining a non-metallic rod may be inserted

through the open cold-water inlet and used to break up any sludge and assist in its removal.

6). Turning the cold water supply back on while the tank is emptying or after the tank has drained

and continuing with the mechanical agitation will further assist with the removal of the sludge.

8. OPERATION & ADJUSTMENT OF THE DIGITAL CONTROLLER Caution:

Alteration of the Digital Controllers programming & settings without authorization from metran

International Pty. Ltd. will void your warranty. This section is provided ONLY for qualified

refrigeration technicians to assist in servicing, repairs or trouble shooting.

8.1 Mounting and fixing method of the remote controller:


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2 2

Illustration 1 Illustration 2

Use flat screwdriver to press down the two back-off

and lift open the face covering.

Remove the top covering leftwards to disengage

two top back-off.

Illustration 3 Illustration 4

Put the remote controller in the electrician base .

box and tighten the two setscrews.

Cover the face covering in the reverse procedures

as shown in Illustration 2 and Illustration 1 to

complete the mounting of the remote controller.

8.2 Functional illustration of the digital controller

The electrical base box of the remote controller is of standard dimension (86 86mm),and

the fixed hole distance is 60mm.Before the interior decoration, if embedded the box and three-

core cable (3 0.5mm2) in the wall ,it will make the overall decoration more beautiful. The user

interface and use functions are shown in the figure below

Operation mode display area Initialization mode Standby mode

Running status and parameter setting display area

IN O UT

1 Clock and timing display area 1

Button control area

8.3 Uses of the digital controller

8.3a ON/OFF control

ON/OFF button. Press this button to power on and off. In the ON mode, the remote controller

displays the operation mode, clock, timing status, bottom of water tank temperature and solar water

collector temperature.

Notice: your metran unit has the power off memory function, if you re power on the unit after power

off , the unit will work again automatically . So if you don't need the digital controller to ON/OFF the

unit , just use the power switch to ON/OFF the unit is ok, if not, please use the digital controller to

ON/OFF it !

Bottom of water tank temperature

solar water collector temperature.

8.3b Effective for electric heating model (Effective for electric heating model)

button for mode selection. Press this button to shift between the ON/OFF electrical heating

modes, and the corresponding display is or .


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OUT

Water heating mode

OUT

Manual mode for electric-heating is on

8.3c Timer ON/OFF setting.

Timer ON setting: Press bottom, and the place of hour and 1 ON will keep

flicking. Press to adjust the setting of the hour. Press button again, and the bit

minute flicks. Press buttons to adjust the setting of minute; timed OFF setting: Press

button again and the place of hour and OFF flicks. Press to adjust the

setting of hour. Press button again, and the bit minute flickers. Press buttons

to adjust the setting of minute. press to end the first timing setting.

Press 3 seconds to enter the second timing setting; and the place of hour and 2

and ON will keep flicking. Press to adjust the setting of the hour. Press

button again, and the bit minute flicks. Press buttons to adjust the setting of minute;

Press button again and the place of hour and OFF flicks. Press to adjust

the setting of hour. Press button again, and the bit minute flickers. Press

buttons to adjust the setting of minute. Press button again to complete and exit the timed

ON/OFF setting mode.

Timing ON setting Timing ON hour

setting Timing ON minute setting

Timing ON setting completed

Timing OFF hour s etting

Timing OFF minute setting

Timed ON/OFF setting completed

Timing ON setting Timing ON Timing ON Timing ON Timing OFF Timing OFF Timed ON/OFF

hour setting minute setting setting completed hour setting minute setting setting completed

8.3d Cancellation of timing setting operation

Press button and press button to cancel the timing 1. Press 3 seconds to enter the second timing setting; and the place of hour and 2

and ON will keep flicking, and press button to cancel the timing 2.

8.3e Keyboard locking / unlocking operation

In non-parameter setting mode, press and hold down and buttons for 10 seconds, and

the system will lock the keyboard automatically. Press and hold down and buttons for 10

seconds again, the keyboard will be unlocked.

8.3f Parameter setting

In the standby mode, press key or key to enter the browsing interface and

can see the parameters of 0-14/A/b/c/d/E/F , then choose the parameters you want to modify ,

and press the key and key at the same time to enter the interface of parameters

modifying , then press the key or key to modify the corresponding parameter

value ,then press the key and key at the same time for confirm the modification .

In the boot - up state. Press key or key to enter the browsing interface and can

see the parameters of 0-14/A/b/c/d/E/F .( but can't modify the parameters )

Note: All the parameters could not be modified under boot-up state and just can be modified under standby mode.


14

metran

Parameter 0 Domestic hot water tank temperature Alternative range: 10 to 70 . Default: 60

Parameter 4 The temp. of start high-temperature disinfection per week Alternative range: 60 to 90 . Default: 70

Parameter 1 Domestic hot water return temperature Alternative range: 2 to 15 . Default: 5

Parameter 5 High-temperature disinfection maintain time Alternative range: 0 to 90 min. Default: 30 min

Parameter 2 Start temp. of heating Aux. Alternative range: 10 to 90 . Default: 55

Parameter 6 Defrost cycle Alternative range: 30 to 90 min. Default: 45 min

MIN

Parameter 3 Electric heating start time delayAlternative range: 0 to 90(N*5)min Default: 6(N*5) min

Parameter 7 Enter defrost temperature Alternative range: -30 to 0 . Default: -7

Parameter 8 Exit defrost temperature Alternative range: 2 to 30 . Default: 13

Parameter 12 Discharge temperature setting of compressor to close the solenoid valve Alternative range: 60 to 80 . Default: 70

Parameter 9 Exit defrost time condition Alternative range: 1 to 12 min. Default: 8 min

Parameter 13 Discharge temperature setting of compressor Alternative range: 90 to 127 . Default: 105 (A:100)

Parameter 10 Difference temp. Value between solar and tank for Solar pump start setting Alternative range: 1 to 20 . Default: 6

Parameter 14 Exiting discharge temperature setting of compressor Alternative range: 60 to 80 . Default: 70

Parameter 11 Discharge temperature setting of compressor to open the solenoid valve Alternative range: 70 to 120 . Default: 5


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metran

8.4 Operation data setting

The unit's operation data can be set on the wire controller. Please set according to the table below.

Parameter

Content description range default Adjust

0 Domestic hot water tank temperature setting 10 70 60 Adjustable

1 Tank temperature difference value for the compressor restart setting

2 15 5 Adjusted by technicians

2 Start temp. of heating Aux. setting 1 10 90 55 Adjusted by technicians

3 Electric heating start time delay 1 0 90 6(N*5) Adjusted by technicians

4 The temp. of start high-temperature disinfection per week setting

1

60 90 70 Adjusted by technicians

5 High-temperature disinfection maintain time 0 90 min

30 min Adjusted by technicians

6 Defrost cycle setting 30 90 min


7 Enter defrost temperature setting -30 0

-7 Adjusted by technicians

8 Exit defrost temperature setting 2 30

13 Adjusted by technicians

9

Exit defrosts max. time cycle setting 1 12 min


10 Different temp. Value between solar and tank for Solar pump start setting 1~20


11 Discharge temperature setting of compressor to open the solenoid valve

70 120


12 Discharge temperature setting of compressor to close the solenoid valve

60~80


13 Discharge temperature setting of compressor

90 127

105

Adjusted by technicians

14 Exiting discharge temperature setting of compressor

60~80

70

Adjusted by technicians

A Tank bottom temperature

-9 99

Actual testing value

B Tank top temperature

-9 99


C Coil temperature

-9 99


D

Discharge temperature

0 127


E Solar collector temperature

-9 99


F Ambient temperature

-9 99


Note:

: Only applies to the heat pump with Aux. electric heater. : Only applies to the heat pump with Solar collector.

Parameter 3 : every unit means 5 minutes ,for example, if you set the parameter is '1' ,that's mean 5 minute, set it to be ''2', it's 10 minute, and so on.

In the operation, if you stop operating for 10 seconds, it will log out automatically.


16

metran

8.5. Time Delay on Start

NOTE: The system has a 3-minute time delay on restart. When the power is after a disconnection then re connection, the time delay on start will commence. The compressor and fan will not operate until the completion of this delay period.

9. RECOGNITION OF ABNORMAL OPERATION

9.1 Pressure & Temperature Relief Valve Running It is not unusual for the Pressure & Temperature Relief valve to allow a small quantity of water to

escape during the heating cycle. The amount of discharge will depend on hot water usage. As

a guide, if it discharges more than 20 litres of water in 24 hours then there may be a problem.

9.1a Continuous Trickle

Likely build up of foreign matter. Try gently operating the release mechanism on the Pressure & Temperature Relief valve for a few seconds. This may dislodge any small particles of foreign matter and rectify the fault. 9.1b Steady Flow

Likely causes are excessive water supply pressure (500kPa Pressure Limiting valve should be

fitted), a faulty Pressure & Temperature Relief valve, a faulty or no pressure limiting valve or a

faulty Thermostat / Digital Controller. Turn off the electricity supply and contact your metran

distributor or service agent.

9.2 No Hot Water

1). Check if the Electricity switched on? Check that the isolating switch, to which the metran Unit is connected, is on. Check that the switch marked Water Heater in the

switchboard is on. Are all circuit breakers on? If on Off Peak, is the meter switching on when it

should? Note if the system is connected to any form of Off Peak, running out of hot water can be

quite common Off Peak tariffs are not recommended for metran water heaters.

2). Check that the thermal overload (on the digital controller) has not been tripped. Turning

the power off then back on will also perform a reset.

3). Check if the Pressure & Temperature Relief valve discharging too much water? See "Pressure & Temperature Relief Valve Running".

4). Do you have the correct size water heater for your requirements? Sizing details are

available from your metran supplier.

5). Check if one outlet (such as the shower) is using more hot water than you think?

Carefully review the family's hot water usage and if necessary check the shower flow rates with

a bucket and a watch. If it is not possible to adjust water usage patterns, an inexpensive flow

control valve can easily be fitted to the shower outlet.


17

metran

Fault code

Motherboard travel light

Malfunction and Protection Name

Solution

Off

Standby

On

Normal start

PP1

1 fl as h 1 of f

Bottom of water tank temp. Sensor failure

1.Check whether the temperature thermostat at the bottom of the water tank is connected loose or not .

2. Connect temperature thermostat of the bottom of the water tank tight or change the temperature thermostat.

PP2

2 fl as h 1 of f

Top of water tank temp. Sensor failure

1. Check whether the temperature thermostat of the upper part of the water tank is connected loose or not.

2. Connect temperature thermostat to the upper part of the water Tank is tight or change the temperature thermostat.

PP3

3 fl as h 1 of f

System coil temp. Sensor failure

1. Check whether the temperature thermostat of the coil is connected loose or not .

2. Connect temperature thermostat of coil tight or change the temperature thermostat.

PP4

4 fl as h 1 of f

Compressor discharge temp. sensor failure

1. Check whether the exhaust temperature thermostat is connected loose or not .

2. Connect exhaust temperature thermostat tight or change the exhaust temperature thermostat.

PP5

5 fl as h 1 of f

Solar energy collector

temp. sensor failure

1. Check whether the temperature thermostat of the solar collector is connected loose or not .

2. Connect temperature thermostat of the solar collector tight or change the temperature thermostat.

PP6

10 flash 1 off

Ambient temp. sensor failure

1. Check whether the ambient temperature thermostat is connected loose or not .

2. Connect ambient temperature thermostat tight or change the ambient temperature thermostat

EE1

6 fl as h 1 of f

System high pressure protection

Check whether lack of water in the system or cycle heating system pipe exist air and need discharge the air , or the water temperature is too high or the refrigerant is too much or high pressure switch has been damaged

EE2

7 fl as h 1 of f System low pressure protection

The system lack of refrigerant or the low pressure switch has been damaged

EE3

8flash 1 off

aux. electric heater overheat protection

The aux. electric heater is broken ,so the unit make overheat protection only effective to the unit with auxiliary electrical heater lack of water protection

EE4

9 flash 1 off

Compressor discharge temp. High

Check whether lack of water in the system, or cycle heating system pipe exist air and need discharge the air, or leakage of Freon in the system, or the water temperature is too high

Defrosting indication

Keep flashing

system is running defrost program

EE8

No flashing Communication failure

Communication wires disconnect or Connection Error

10. SYSTEM MALFUNCTION SCHEDULE

d


18

metran

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B

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Blu

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11. JUDGEMENT AND SOLUTION OF MALFUNCTIONS

Malfunction Reason Solution

Unit does

not work

1.Power failure

2.Loose power wire connection

3.Fuse of controller burn-out

1.Turn off power and inspect power supply

2.Identify the cause and rectify

3.Identify the cause and replace with new fuse

The pump is

operating, but

water isn't

circulatory or the

noise of pump is

to loud

1. Shortage of the water or exist air

in the water system.

2.Water pump damage

3.Valve of water system is not all opened

4.Water filter is blocked

1.Check water supply equipment and replenish

water remove the air of the water system

2. Change to another pump.

3.Open the valve of the water system

4.Clean the water filter and the pump

Unit heating

capacity is low or

compressor

long term working

1.Shortage of refrigerant or leakage

2.Poor thermal insulation of water system

3.Poor heat dissipation of the air heat exchanger

4.Shortage of water flow

1.Check the system for leakage and fill refrigerant

2.Strengthen thermal insulation of the system pipeline

3.Clean the air heat exchanger and improve the

condensation condition

4.Clean the filter

Compressor

discharge pressure

too high

1.Excessive refrigerant

2.Poor cooling capacity of air heat exchanger

1.Release the excess refrigerant

2.Clean the air heat exchanger and improve

condensation conditions

Compressor

suction pressure

too low

1.Shortage of refrigerant or leakage

2.Filter or capillary blocked

3.Poor condenser heat dissipation


2.Replace capillary tube or filter

3. Clean the heat exchanger.

Compressor is

out off

operation

1.Power failure

2.Compressor contactor breaks down

3.Loose connection

4.Overload protection of compressor

5.Incorrect setting of the return water

temperature in the water tank

6.Compressor capacitance break down

1.Check the power supply and debug

2.Replace the contactor

3. Check the loose place and maintenance it.

4. Overload protection of the compressor.

5. Reset the return temp.

6. Replace the capacitance.

Loud compressor

noise

1.Liquid refrigerant enters the compressor

2.Compressor breads down

1.Check the cause for liquid impact and solve the problem

2.replace the compressor

Fan is out of

operation 1.The relay or capacitance of the fan breaks down

2.Burnt the fan motor

1.Replace the fan relay or capacitance

2.Replace the fan motor

The compressor

is in operation,

but the unit

doesn't heating

1.All the refrigerants leak out

2.Compressor breaks down


2.Check the reason and replace the compressor

12. WIRING DIAGRAM

Blue

Fan

Four-way valve

Yellow/greed

solenoid valve

Red

Capacitance

Red

Compressor Electrical

heating

Ambient temp.

Solar collector temp. 1

Discharge temp.

C Yellow/greed Coil temp.

R Com

S Top of tank temp. 2

Capacitance

Bottom of tank temp.

Blue Transformer

Brown Blue Green

Blue

Power input

Pump

3 Cycle pump

output

Annotation: 1 :Effective for Solar model

2 :Effective for electricheating model

3 :Effective for electricheating model

CODE:MK3045/MK3058

metran


Metran International Pty. Ltd.

8 Lochern Court

North Lakes 4509

Queensland – Australia

Email: [email protected]

Website: http://www.metrangroup.com

mailto:[email protected]

http://www.metrangroup.com/

Documents

AIR TO WATER ALL IN ONE HEAT PUMP TO WATER ALL IN ONE HEAT PUMP 2 metran Contents 7. MAINTAINANCE & SERVICE INFORMATION 10 7.1 The Water Tank 10 7.2 Air Evaporator Coils