Gas Fired Unit Heaters - Reznor HVAC

Gas Fired Unit Heaters

'T' SERIES

Ambi-Rad EnviroAir gas-fired, warm air heaters arecompact, fully automatic units for industrial and commercialapplications. They are simple to install and provide efficient,practical and economic heating, without occupying valuablefloor space.Designed and manufactured to the highest degree of technicalexcellence, the heaters have an established record of long life, lowmaintenance and reliability. The 'Thermocore' Heat Exchanger at the heartof each unit has been proven in over a million installations throughoutthe world.The new generation of CE approved units incorporates design features tofurther extend heat exchanger life and enhance thermal efficiency.The heaters are available either as conventional open flued appliances,drawing their combustion air from inside the building or as room sealedunits drawing in external fresh air for combustion.The 'T' Series heaters are complete with an integral down draught diverterand conventional open flue connection.

'ST' SERIES

The 'ST' Series heaters are room-sealed, fan-assisted, balanced flue unitsincorporating a separated combustion system. Separated combustiontechnology provides mechanically induced outside air for combustion,preventing dirt, lint, dust or other contaminants from entering the burnersor combustion process. The room sealed units provide significantimprovements in seasonal efficiency and reduced running costs comparedto conventional open flued heaters.

Industrial Showroom Warehousing and Storage

AMBI-RAD®

COMPREHENSIVE RANGEThe units are available in eleven outputcapacities from 17kW to 93kW.

CHOICE OF FUELSStandard units are suitable for operation onnatural gas; units for propane are availableas an option.

VERSATILE INSTALLATIONSHeaters are designed for either suspendedor base-mounted installation. Units may beeither freeblowing or fully-ducted. A rangeof outlet nozzles is available to give greaterflexibility of air distribution. For ease ofservicing, the burners are mounted in a slideout drawer, accessed from the left-hand sideof the heater (viewed from the front).Opposite hand units with right-hand sideaccess are available as an option.

OPTIONAL BURNER CONTROLSTwo-stage, High Low burner regulationprovides closer temperature control. Sincethe heater runs for longer periods on lowsetting, the air circulation is improved andstratification is significantly reduced. Thetwo-stage control system is particularlybeneficial on ducted systems.Modulating burner regulation providesproportional control between high- andlow-fire, for even closer temperaturecontrol. The modulating control system isideal for make-up air applications.

ECONOMYThe Thermocore Heat Exchanger providesoptimum efficiency and economy.Room-sealed ST units provide additional fueleconomy, with fully automatic ignition andintegral-powered flue being fitted asstandard. The sealed power flue systemeliminates the loss of heated room airassociated with conventional flue systems,thus providing significant energy savings. Thedesign also utilises waste heat from fluegasses to preheat incoming combustion air,maximising combustion efficiency.

MODEL OPTIONSAll units incorporate a high efficiencyThermocore Heat Exchanger, plusalternative air handling systems.

Axial FanTA and STA units are fitted with high qualityaxial fans to provide excellent airdistribution at low noise levels, forfreeblowing applications.

Centrifugal FanTB and STB units are fitted with belt drivecentrifugal blowers for increased air flowsand mounting heights, or for ductedinstallations with static pressures up to400 Pa.

Enclosed FanTE and STE units are fitted with a fanenclosure cabinet and belt drive centrifugalblowers. The fan enclosure allows the use ofreturn air ducts, filters and fresh air intakes.Full size access doors are fitted to bothsides of the fan cabinet for ease of serviceaccess.

Mixing BoxTE and STE units may also be fitted with amixing box type fan enclosure cabinet. Thefan enclosure cabinet can be fitted witheither a single fresh air damper orinterlinked fresh and return air dampers.The dampers may be either manuallycontrolled or fitted with two position orfully modulating damper actuators.Optional filters fitted internally within thecabinet provide filtration to both the freshair and recirculation air.

DESTRATIFICATIONAn optional destratification system may be added to heaters mounted at high level to recirculatestratified warm air back down to working level, even when the burners are switched off.A temperature sensor monitors the high level air temperature and operates the heater fanindependently of the burner.

Gas Fired Unit HeatersINSTALLATION

LocationUnits may be suspended or base-mounted ona non-combustible surface. Installation shouldbe carried out by a competent CORGIregistered installer, in accordance with theinstallation instructions provided and currentcodes of practice. Incorrect installation willinvalidate the warranty.For applications supplying fresh airventilation stainless steel heatexchangers (AISI 409) arerecommended. Where chlorinatedvapours or certain other contaminantsmay be present special grade stainlesssteel (AISI 316) should be specified.Whilst the units are suitable for mostindustrial and commercial applications,standard units must not be installed inatmospheres containing highlyflammable vapours, combustible dust,halogenated hydrocarbons orchlorinated vapours. For suchapplications, separated combustionunits or remotely-sited units will berequired depending on the application.Care should be taken to ensure that the unitsare level and isolated from any vibrations.ALWAYS ENSURE ADEQUATECOMBUSTION AIR IS PROVIDED INCOMPLIANCE WITH BS 5440AND/OR BS 6230 DEPENDENT ONHEAT OUTPUT OF THE APPLIANCE.

FlueConventionally flued T Series heaters aresupplied complete with integral down draughtdiverter. A flue collar located on top of theheater accepts single wall flue; an adaptor willbe required for other types of flue.A power flue venter is available as an optionalextra. Power-vented flues may be used fordifficult flue routes, horizontal flues, or toovercome slightly negative pressure within thebuilding.Room-sealed ST heaters are fitted withintegral power flue venters and a differentialair pressure switch. The pressure switchmonitors flow and shuts down the heater inthe event of flue or combustion air blockage.To comply with CE approvals, room-sealed STappliances must be used with the sealed fluesystem provided by the manufacturer. Thebalanced flue terminal provides both the flueoutlet and air inlet from a single building

penetration. The balanced flue outlets areordered separately from the heater and achoice of wall outlet or roof outlet is available.Up to 9 metres of additional pipe can beadded to both the flue and the combustionair inlet (reduce by 1.5 metres for each90° bend).Connections to the heater flue outlet andcombustion air inlet require sealed single wallpipe.

Gas SupplyThe connection size to the heater does notindicate the size of gas supply pipeworkrequired. Gas supply pipework should be sizedwithin allowable pressure drops to complywith current codes of practice.Standard units are supplied for use on naturalgas and require a minimum inlet pressure ofI7.5mbar. Maximum inlet gas pressure to theunit should not exceed 30mbar.

TYPICAL BALANCED FLUEARRANGEMENTS

ElectricalUnits must be wired in accordance with thewiring diagrams provided and the currentedition of electrical standards. The mainelectrical supply to the units should not beisolated except for maintenance. Controlsmust be wired to the appropriate terminalsand must not interrupt the mains supply tothe heater.

Standard Top Flue Outlet

Optional Side Flue Outlet

DIMENSIONS

BALANCED FLUEOUTLETS

Overall LengthExternal LengthMaximum Additional Flue*

100mm dia

ROOF

1360555†9m

WALL

7652109m

130mm dia

ROOF

20051175†9m

WALL

9301959m

* Deduct 1.5 metres for each 90° bend. An equal amount of combustion air pipe may also be added,

† Varies according to roof pitch.

ACCESSORIES

Vertical LouvresVertical louvres may be added as an optionand are recommended where low dischargeair temperatures are used.Horizontal louvres are fitted as standard onTA and STA units and may be ordered as anoption on TB, STB, TE, and STE units.

Downturn NozzlesOptional 30° or 60° downturn nozzles increase the angle of air discharge and are recommended forunits installed above the minimum mounting height.Axial fan models may be fitted with either 30° or 60° nozzles but vertical louvres can only be added to30° nozzles.Centrifugal blower models may have 30°, 60° or 90° nozzles fitted and vertical louvres may be added asrequired to any nozzle.For heaters at extreme mounting height a 90° head complete with discharge plenum may be fitted. Theair may be directed using a two way or four way outlet to give the air distribution pattern required.

Destratification FansDestratification fans return air from the roofspace back down to the working zone. Theymay also be successfully applied in modern,well insulated buildings where low heat inputsrequire additional air recirculation to ensureeven temperature distribution.Depending upon the application thedestratification fans should be selected toprovide between 1.5 to 4 volume turnoversper hour. Two models are available:

DS 5 4900m3/hr for mounting heightsbetween 5 and 10 metres.

DS 10 10,250mVhr for mounting heightsbetween 10 and 15 metres.

Control PanelsAmbi Stat remote control panels provide:

Digital time control.

Day and night temperature thermostats.

Summer 'fan only' facility.

Remote lockout reset' for units fitted withauto ignition.

Ambi Tec II panels are fully electroniccontrollers and have a remote tamperproofsensor for greater accuracy and energy saving.A single sensor provides both day and nighttemperature settings, the sensor may be sitedup to 100 metres from the panel. The unitsfeature

Digital time control.

Single sensor for day and night settings.

Timed summer 'fan only' facility.

Remote 'lockout reset' for units fitted withauto ignition.

Ambi Tec EM I panels are micro processorEnergy Management controllers and share thesame basic features as the Ambi Tec II plus anoptimum start facility. The Ambi Tec EM Iunits must be specified for units with twostage High Low burner control, fullymodulating burner control or constantfan operation.

AMBI-RAD®

SPECIFICATION 'T' SERIES

CabinetsAll components exposed to products of combustion aremanufactured from aluminised steel. Exterior panels have abaked-paint finish.

Heat ExchangerThe Thermocore venturi tube heat exchanger assembly ismanufactured from special grade aluminised steel. For applicationsusing fresh air or where the temperature rise across the unit is lessthan 22°C, optional stainless steel (AISI 409) heat exchangers arerecommended.

BurnersCorrosion resistant aluminised steel burners with stainless steelribbons are mounted in a slide-out burner tray. The burner traywithdraws from the left side of the unit (when facing the airdischarge), opposite hand units are available as an option.

Gas and Safety ControlsStandard 'T' Series models are fitted with a multi-function gascontrol valve permanent pilot and a thermoelectric safety controlsystem. Fully automatic electronic ignition may be fitted as anoption. An integral fan control delays the fan operation until the unit

has reached operating temperature. The fan control also allows forfan overrun after the burners have switched off so that all residualheat is dissipated into the building.A limit switch thermostat shuts down the heater in the event ofoverheating. For additional safety a dual limit thermostat is fitted onall EnviroAir units.

Air HandlingTA models are fitted with direct drive axial flow fans and singlephase 230V motors. TA units are supplied complete with horizontallouvres.TB and TE models are fitted with double inlet, centrifugal blowerscomplete with belt drive. An adjustable pulley is fitted to allow smallvariations for on-site balancing. Standard units are fitted with singlephase 230V motors, optional three phase motors are available forincreased duty.TB and TE are supplied as standard with a duct outlet flange forconnection to ductwork. The data table indicates the airflow andstatic pressure available for ducted applications with the standardmotor. For higher airflows or for static pressures up to 400 pascalslarger motors may be specified. The data table indicates themaximum airflows available, excluding filter and damper resistance.

TECHNICAL DATA 'T' SERIES

Nominal Heat Output (kW)Gas Rate G20 Nat Gas (m3/h)Gas Connection (BSP in)Nominal Flue Diameter (mm)

7517

2.05

125

10023

2.73

150

12529

3.41

175

15035

4.10

200

17541

4.78

200

20047

5.46

200

22552

6.15

200

25059

6.83

200

30070

8.20

250

35081

8.57

250

40093

10.95

250AXIAL FAN MODELS TAAirflow Freeblowing (m3/h)Motor Rating (kW)Mounting Height (m)Throw* (m)

20400.342.516

20400.342.5

16

24600.34

2.5-3.020

33000.34

2.5-3.024

33000.34

2.5-3.024

42600.47

2.5-3.2528

42600.47

2.5-3.2528

57000.58

2.5-3.530

57000.58

2.5-3.530

66000.82

2.5-4.035

75600.82

2.5-4.038

CENTRIFUGAL FAN MODELS TB & TEAirflow FreeblowingMounting Height (m)Throw* (m)Mounting Height c/w 90° (m)Standard Motor (kW)Airflow Ducted (Standard Motor) (m3/h)Max. Pressure (Standard Motor) (Pa)Max. Motor Size (kW)Max. Airflow (m3/h)Max. Pressure at Max. Airflow (Pa)Max. Airflow at 400Pa

19082.5-3.0

18-

0.3716502501.1

30004003000

25563.024

3.0-4.00.3720402501.1

30004003000

33843.025

3.0-5.00.3725502001.1

40004004000

39603.0-3.5

313.0-6.0

0.372900150

50004005000

40683.0-3.5

313.0-6.0

0.3734001001.5

50004005000

50403.0-4.0

313.5-7.0

0.564250

1002.2

7200150

6400

56163.0-4.0

323.5-7.0

0.754700

1002.2

7200150

6400

64083.0-4 .0

323.5-7.0

0.7551001503.0

90004009000

76683.0-4.5

344.0-8.0

1.1059502003.0

90004009000

85003.0-4.5

354.0-9.0

1.1073001003.0

10500200

10000

88563.0-5.0

474.0-10.0

1.1076001003.0

1200050

11000

* Throw depends on height of building, mounting height of heater, room temperature and louvre settings.

(m /h)3

(m3/h)

¾ ¾ ¾ ¾ ¾ ¾ ¾ ¾ ¾ ¾ ¾

1.5


SPECIFICATION 'ST' SERIES

CabinetsAll components exposed to products of combustion aremanufactured from aluminised steel. Exterior panels have a durableepoxy powder coat finish.

Heat ExchangerThe Thermocore venturi tube heat exchanger assembly ismanufactured from special grade aluminised steel. For applicationsusing fresh air or where the temperature rise across the unit is lessthan 22°C, optional stainless steel (AISI 409) heat exchangers arerecommended. For areas where chlorinated vapours may be presentcorrosion resistant stainless steel (AISI 316) should be specified.

BurnersCorrosion resistant aluminised steel burners with stainless steelribbons are mounted in a slide-out burner tray. The burner traywithdraws from the left side of the unit (when facing the airdischarge), opposite hand units are available as an option.

Gas and Safety ControlsA multi functional gas control valve and a fully automatic ignitionsystem provide full safety monitoring of the heater operation. Fanoperation is controlled by an integral fan control which delays startup until the unit has reached operating temperature and continues

to operate the fan after the burners have shut off, until all useful heathas been dissipated into the building. A differential pressure switchmonitors the operation of the integral power flue venter, so that in theevent of a flue or combustion air blockage or failure of the venter fan,the unit would not operate.A limit switch thermostat shuts down the heater in the event ofoverheating. For additional safety a dual limit thermostat is fitted on allEnviroAir units.

Air HandlingSTA fan models are fitted with direct drive axial flow fans and singlephase 230V motors. STA units are supplied with horizontal louvres.STB and STE centrifugal fan models are fitted with double inlet,centrifugal blowers and a belt drive with an adjustable motor pulley, toallow small on-site adjustments to be made. Standard units are fittedwith single phase 230V motors, optional three phase motors areavailable for increased duty.STB and STE are supplied as standard with a duct outlet spigot forconnection to ductwork. The data table indicates the airflow and staticpressure available for ducted applications with the standard motor. Forhigher airflows or for static pressures up to 400 pascals larger motorsmay be specified. The data table indicates the maximum airflows,excluding filter and damper resistance.

TECHNICAL DATA 'ST' SERIES

Nominal Heat Output (kW)Gas Rate G20 Nat GasGas Connection (BSP in)Flue Diameter (mm)Combustion Air Inlet (mm)

10023

2.75

100100

12528

3.36

100100

344.07

100100

17540

4.76

130130

22550

6.03

130130

30069

8.25

130130

40091

11 .01

130130

AXIAL FAN MODELS STAAirflow FreeblowingMotor Rating (kW)Mounting Height (m)Throw* (m)

17000.0752.517

24000.12

2.5-3.020

37000.12

2.5-3.028

37000.12

2.5-3.2528

42000.12

2.5-3.528

56002 x 0.122.5-3.5

32

79002 x 0.122.5-4.0

38

CENTRIFUGAL FAN MODELS STB & STEAirflow FreeblowingMounting Height (m)Throw* (m)Mounting Height c/w 90° (m)Standard Motor (kW)Airflow Ducted (Standard Motor)Max. Pressure (Standard Motor) (Pa)Max. Motor Size (kW)Max. AirflowMax. Pressure at Max. Airflow (Pa)Max. Airflow at 400Pa

22003.024-

0.1819001001.1

30004003000

26003.025-

0.1821001001.1

40004004000

36003.0-3.5

303.0-6.0

0.373000150

5000400

5000

41503.0-3.5

313.0-6.0

0.373500100

50004005000

50003.0-4.0

323.5-7.0

0.554200

100

7200150

6400

68003.0-4.5

344.0-4.5

0.7558001003.0

90004009000

86003.0-5.0

474.0-10.0

0.7573001003.0

12000200

11000

* Throw depends on height of building, mounting height of heater, room temperature and louvre settings.

150

1.2 1..2 1..2

AMBI-RAD®

(m3/h)

(m3/h)

(m3/h)

(m3/h)

(m3/h)

(m3/h)

'T' SERIES DIMENSIONAL DATA

Gas

Gas

ElectricalConnections

SIDE 'TA'

FRONT 'TB/TE' SIDE 'TB'

DIMENSIONS TA & TB (mm)

MODELHeater width

Height

Depth axial fan model TA

Depth centrifugal fan model TB

Suspension centres TA & TB

Duct outlet internal width TB

Flue outlet diameter

Front to centre of flue TA & TB

Side clearance (controls access) †

Side clearance (non control side)

Top clearance

Bottom clearance* (to combustibles)

Minimum flue height (m)

Approx weight TA kg

Approx weight TB kg

AB

CDEFG

H

J

7548881986511333483171254896401521521522.08098

100488819

8651 1 3 33483171504896401521521522.08098

1255588199081133418387175489

7101521521522.086118

150/17569881992712265585272004898501521521522.093136

200/22583889592912266986672004389901521521522.01 1 8147

25010488959211 1 3 390887620043812001521521522.5146177

30010488959211 1 3 390887625043812001521521522.0146177

3501187

89592912261048101625043813401521521522.5166185

400132889592912261187115625043814801521521522.5191223

* Units may be base mounted on a suitable non-combustible surface.† Units may be ordered with controls access from right-hand side as an option (non standard).


FRONT 'TE' SIDE 'TE'

REAR 'TE'

Note: For TE units with mixing box cabinet complete with dampers and filters consult Ambi-Rad for dimensional data.

DIMENSIONS TE (mm)

MODELHeater width

Height

Ducted air inlet width TE

Ducted air inlet height TE (open cabinet)

Suspension centres TE

Duct outlet internal width TE

Flue outlet diameter

Front to centre of flue TE


Side clearance (non control side)Top clearanceBottom clearance* (to combustibles)

Minimum flue height (m)

Approx weight TE kg

A

B

CDEFGH

J

75488819451706348317125489

640

1521521522.0106

100488819

451706348317

4896401521521522.0106

125558819

4517064183871754897101521521522.0134

150/1756988195917065585272004898501521521522.0151

200/2258388957307836986672004389901521521522.0160

250104889594078390887620043812001521521522.5206

300104889594078390887625043812001521521522.0206

350118789510807831048101625043813401521521522.5213

40013288951219

7831187115625043814801521521522.5251

* Units may be base mounted on a suitable non-combustible surface.† Units may be ordered with controls access from right-hand side as an option (non standard).

150

AMBI-RAD®

'ST' SERIES DIMENSIONAL DATA


GasConnection

FRONT 'STA' SIDE 'STA' TOP 'STA'

FRONT STB


GasConnection

SIDE STB

DIMENSIONS STA & STB (mm)

MODELHeater width

Depth axial fan model STA

Depth centrifugal fan model STB

Suspension centres STA & STB

Duct outlet spigot width STB

Flue fan outlet diameter

Combustion air inlet diameter

Front to combustion air inlet

Combustion air inlet/flue outlet centres



Top clearance


Approx weight STA kg

Approx weight STB kg

A

BCDEFGH

JK

100520859118035936010210216614055015015015086108

125590897

1237429430

102102166140620

15015092135

7309021330569570102102166140750150150150108155

175730902133056957013213290

225750150150150108155

225870902133070971013213290

225900150150150130168

30010808971237919

92013213290

2251100300150150150193

400136090213301199120013213290

2251400300150150195248

* Units may be base mounted on a suitable non-combustible surface.† Units may be ordered with right-hand controls, i.e. controls access, flue and air inlet on right-hand side (non standard).

TOP STB

150

150


'STE' SERIES DIMENSIONAL DATA

FRONT 'STE'

REAR 'STE'(open back cabinet)

TOP 'STE'(with optional damper locations)

DIMENSIONS STE (mm)

MODELHeater width

Overall width STE with baseframe

Ducted air inlet width STE

Suspension centres STE

Duct outlet spigot width STEFlue fan outlet diameter

Combustion air inlet diameter

Front of heater to combustion air inlet

Combustion air inlet/flue outlet centres



Top clearance


Approx weight STE kg

A

B

C

DEF

G

H

J

K

100520524370436360102102166140550

155

125590594440506430102102166140620

150150188

730734580646570102102166140750150150150219

I75

73073458064657013213290225750

219

225870874720

78671013213290

225900150150150241

3001080108493099692013213290

2251100300150150295

4001360136412101276120013213290

2251400300

150350

* Units may be base mounted on a suitable non-combustible surface.† Units may be ordered with right-hand controls, i.e. controls access, flue and air inlet on right-hand side (non standard).

SIDE 'STE'

150

150

150150

150 150150150

150

AMBI-RAD®

COMPANY PROFILEAmbi-Rad Limited specialises in theproduction of a complete range of gas-firedheating systems primarily for industrial andcommercial building applications.

Since its foundation in 1979, Ambi-Rad hasdeveloped into a truly global business andnow operates in over 35 countries worldwide. The company's philosophy is toprovide a supply-based service tocontractors, professional bodies andpremises' managers. Ambi-Rad offers a full

range of services including: system design,on-site support and commissioning, inaddition to a comprehensive service backup.The aim of the company has always been tosupply the most efficient and cost effectivesolutions to the heating needs of industrialand commercial companies.

COMPLETE SERVICEAmbi-Rad offers a complete range of after-sales service options. It has a dedicatedservice department that has BS EN ISO9002:1994 accreditation; is Corgi registeredand all members are trained to CITBstandards and have gained ACOPSregistration. Ambi-Rad offers a standardone-year parts and labour guarantee,optional warranty schemes of up to tenyears are available upon request.Ambi-Rad is continually developing its policyof Total Quality Management. A full QualityPlan and Certificate of Conformity areavailable for a nominal charge.

Ambi-Rad is a registeredtrademark of AMBI-RAD LTD.Due to continuous product innovation,AMBI-RAD reserves the right to changeproduct specification without due notice. Energy Efficient Heating Systems

AMBI-RAD LIMITED • FENS POOL AVENUE • WALLOWS INDUSTRIAL ESTATE • BRIERLEY HILL • WEST MIDLANDS DY5 1QATELEPHONE 01384 489700 • FAX 01384 489707

e-mail: [email protected],uk • http://www.ambirad.co.ukDoc. Ref. no. WA/017/02 99

AMBI-RAD®

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Gas Fired Unit Heaters - Reznor HVAC