PDR 1/14/2003

NATATORIUM

DEHUMIDIFICATION

DESIGN MANUAL

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INDOOR POOL DEHUMIDIFICATION DESIGN MANUAL

Conventional indoor pool dehumidification systems are both drafty and costly to operate. The refrigeration controls are sensitive, susceptible to failure and difficult for field technicians to troubleshoot.

Nautica has resolved these problems by developing a more energy efficient and reliable indoor pool dehumidification system. Driven by many years of practical refrigeration experience, the Nautica indoor pool dehumidification and water heating system is designed to be simple and less expensive to install, operate, maintain, troubleshoot and service, and to provide a higher level of comfort.

Indoor pool dehumidifiers have been around for several decades and the basic concept, to remove humidity by overcooling pool air, then compensate with re-heating, has not changed.

Nautica dehumidifiers utilize MSP® heat transfer technology which comprises a regenerative heat exchanger to reduce the load on the cooling coil by pre-cooling. This unique feature reduces energy consumption by up to 50% and allows airflow to be cut by up to 70%, thereby saving energy and reducing drafts, which addresses the two most common complaints of indoor pool owners.

Another significant feature of the Nautica system is water-side heat rejection. All heat, generated from the dehumidification process, is transferred to a water loop.

Heat is then extracted from the loop to warm the pool water and room air. Surplus heat is rejected outside the building in summer. The refrigerant-side of the system is straight forward, without complicated controls. A small refrigerant charge is used and the system is easy to troubleshoot and repair.

Conventional pool dehumidifiers reject heat by routing hot refrigerant gas to a reheating coil, pool water or outdoor condenser. This process use automatic solenoid valves, check valves and piping to route the hot refrigerant gas to the appropriate device. On paper it looks good. However, excessive amounts of costly refrigerant are needed to fill the system and the devices in the refrigerant circuit are subject to malfunction if a slight amount of dirt is present. Refrigerant in these systems tends to migrate to the coldest area giving the illusion of a shortage, which often results in improper diagnosis, and over-charging.

Designing dehumidification systems for indoor swimming pools is a specialized area of HVAC design engineering. This design manual provides a simple method for sizing dehumidification equipment for indoor swimming pools, without elaborate calculations.

Dehumidifiers utilizing MSP® heat transfer technology are compatible with chilled water or refrigerant based systems and can be served by a wide range of conventional chillers and condensing units, using any fuel source.

KEY FEATURES AND BENIFITS BENIFIT EXPLANATION OF BENIFIT

OPERATING SAVINGS Energy consumption about one-half that of conventional dehumidification systems. No reheating to compensate for over-cooling.

INSTALLATION SAVINGS Smaller equipment and ductwork. Lower power requirements. IMPROVED COMFORT Minimal drafts. Airflow is up to 70% less than conventional systems.

HIGH RELIABILITY Water-side heat rejection eliminates complicated and temperamental refrigerant-side controls, reduces breakdowns, and simplifies troubleshooting.

LONG-LIFE Special construction & corrosion resistant coatings. REDUCED REFRIGERANT Water-side heat rejection reduces the amount of costly refrigerant.

NO “OVERSIZING" System is designed to meet the exact requirements of the specific application. Cooling, heating, dehumidification and water heating are sized for the specific requirements of each project.

WIDE RANGE OF SIZES Precise matching of dehumidification equipment to the load. MULTIPLE OPTIONS Dehumidification only, cooling, and heating options also available.

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NAUTICA vs. CONVENTIONAL DEHUMIDIFICATION TECHNOLOGY

FIGURE 1 - CONVENTIONAL DEHUMIDIFIER

COOLINGCOIL

HEATINGCOIL

FAN

With conventional dehumidification technology (Figure 1, above), warm humid air, flows through a cooling coil where it is cooled and dehumidified. The dehumidified and cooled air is then reheated through a heating coil prior to entering the conditioned space. In the regenerative dehumidification technology (Figure 2, above), warm, humid air flows through the first pass of an air-to-air heat exchanger for pre-cooling and dehumidification by thermal exchange with the cooler leaving air. The air then passes through a cooling coil for final cooling and dehumidification. The dehumidified and cooled air is then drawn back through the opposite side of the air-to-air heat exchanger to be heated, prior to entering the conditioned space.

FIGURE 2 - REGENERATIVE DEHUMIDIFIER FAN PLATE HEAT

EXCHANGER

COOLING COIL

CONDENSED MOISTURE

As in conventional dehumidification, the regenerative technology uses ordinary refrigerants or chilled water. However, in the energy-efficient regenerative dehumidifier, a lower temperature air enters the cooling coil as a result of pre-cooling and dehumidification through the air-to-air heat exchanger. This innovative combination of an air-to-air heat exchanger with conventional cooling coil results in reduced compressor capacity, requiring half the energy for dehumidification compared with conventional dehumidification systems.

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PDH SYSTEM CONFIGURATION

FIGURE 3 - AIR AND WATER FLOW SCHEMATIC

SPA WATERHEAT

EXCHANGE

OUTDOORHEAT

EXCHANGE

LOOPPUMP

MSPTM

DEHUMIDIFIERWATER COOLED

CONDENSING UNIT

ROOMHEATEXCHANGE

CONDENSER

FAN

MSPTM

COIL

POOLWATERHEAT

EXCHANGE

COMP-RESSOR

PACKAGEDOR SPLIT

HEATING LOOP COMPONENTSMAY PACKAGED WITH

CONDENSING UNIT OR SPLIT.

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FIGURE 4 - INDOOR POOL DEHUMIDIFIER – LEVELS OF PRODUCT OFFERING

LEGEND: EA = EXHAUST AIR OA = OUTSIDE AIR RA = RETURN AIR SA = SUPPLY AIR

IIIENERGY

RECOVERYVENTILATION

POOL

WATER

HEATING

OPTIONSENERGY RECOVERY UNIT TOMEET VENTILATION NEEDS.

STANDARD AND HIGH-EFFICIENCYHEAT EXCHANGERS.

DIRECT EXPANSION OR CHILLEDWATER COILS TO MEETDEHUMIDIFICATION NEEDS.

AIR COOLED AND WATER COOLEDCONDENSING UNITS.

LEVEL

VENTILATION TO MEET INDOOR AIRQUALITY NEEDS (Note: Ventilation airmust be heated to 650F minimum)

BYPASS TO MEET AIR-CHANGEAND COOLING NEEDS.

HOT WATER HEATING COIL TOMEET ROOM HEATING NEEDS.

EA

OA

RA

SA

RA

SA

RA

HEATING

OA

IBASIC

DEHUMID

IIVENTILATION,BYPASS AIR,

COOLING,& HEATING

Features • Split or packaged units • Indoor & outdoor construction • Air-cooled, water-cooled or chilled water • Double-wall construction • Stainless steel drain pans, epoxy coated coils • Internally isolated fans • Modular designs • All voltage options

Options • Hot water or steam heating coils • Electric heat • Single point electrical connections • Unit mounted disconnect switch • Self-contained control system • High efficiency MSP® heat exchangers • Roof curbs—isolation and standard • Temperature control option

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INDOOR POOL DEHUMIDIFICATION DESIGN STRATEGY TABLE 1 - INDOOR POOL HVAC RELATED FUNCTIONS AND DEPENDENT FACTORS

FUNCTION DEPENDENT FACTORS

1 Dehumidification& Water heating Water surface area, water temperature. Indoor air temperature and indoor humidity

2 Room cooling Design heat gain 3 Room heating Design heat loss 4 Ventilation Room area and occupancy level 5 Air changes Room volume and occupancy level 6 Window defogging Window area

Table 2 illustrates the six HVAC-related functions associated with the indoor pool environment and their dependent factors.

Dehumidification and water heating share common dependent factors because "The energy needed to dehumidify an indoor swimming pool is equal to the energy needed to maintain its pool water temperature". The remaining functions have dependent factors that are unrelated to dehumidification, water heating and each other.

Conventional pool dehumidifiers, when designed for dehumidification and water heating, are normally oversized for cooling and compensated with reheat. In applications with exceptionally high solar loads, a conventional dehumidifier may be undersized for cooling. Therefore, it is not reasonable to expect a single unit, designed specifically for dehumidification and water heating, to efficiently meet the cooling requirement without compromise. Furthermore, energy needed for cooling most indoor pools represents a small fraction of the annual energy needed for dehumidification. Therefore, a properly designed system should treat cooling separately from dehumidification and water heating.

Compressor capacity and air volume in regenerative dehumidifiers is much lower than that of conventional dehumidifiers. This savings results in:

Lower installation, operation and maintenance cost. High operating cost is the most frequent complaint from indoor pool owners.

Lower air volume. Drafts and excess air movement is the second most frequent complaint from indoor pool owners.

The following is a discussion of the primary and secondary, HVAC-related, indoor pool functions:

DEHUMIDIFICATION ONLY (THE BENEFITS OF A POOL COVER)

The pool water heating components of a dehumidification system adds considerable cost and may not be justifiable when a pool cover is employed or where large amounts of ventilation air, can cause significant reduction in run-time of the dehumidifier/water heater. In these cases, a dehumidification only scenario may be practical. To avoid unnecessary expense, a careful study of these issues, in the specific application, should be undertaken.

DEHUMIDIFICATION AND WATER HEATING

These synergistic functions are well served by a regenerative dehumidification system consisting of a dehumidifying air handler and a conventional water-cooled condensing unit that has a corrosion-resistant condenser.

In this system, the condenser heat is sufficient to maintain pool water temperature. Excess heat is routed to a heat recovery coil mounted in the air stream leaving the dehumidifier.

When a cooling option is chosen, an optional fan-coil unit may be used for outside heat rejection when room heating is no longer needed.

An auxiliary (second stage) pool water heater is recommended for rapid warm-up from a cold condition. This heater may be an electric, hot water or steam heater. This heater is especially important in colder climates where the introduction of outdoor air, in sufficient quantity, acts to dehumidify and cause premature shut down of water heating.

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ROOM COOLING

Regenerative dehumidifiers using plate heat exchangers convert most of the sensible heat energy to latent heat energy. Consequently, very little energy is available for room cooling.

Requirements vary greatly for room cooling, from a below grade pool with no windows to a pool with considerable glass and skylight area, creating a heavy solar load. The cooling load is calculated using conventional methods. The latent portion of the outside air load should be included in the cooling calculation.

With a cooling option, to avoid heat being added to the room through the indoor heat recovery coil, an optional outside heat rejection fan-coil unit may be used.

ROOM HEATING

After heating pool water, any remaining rejected heat is used to warm room air. A second stage heater is normally needed for additional room heat. This heater may be an electric, hot water or steam coil mounted in the duct. The heating load is calculated using conventional methods.

VENTILATION

The designer should avoid excessive amounts of ventilation air, especially in colder climates where outside air shortens the run-time of a dehumidifier and reduces the available energy for water heating. Nautica recommends no more than 20 CFM/occupant, averaged over the active period.

Ventilation should be provided for purging of the space in the event of a chemical emergency. ASHRAE recommends a minimum of 0.5 cfm per square foot of pool and deck area.

Outside air, should be pre heated in winter to 70°F and introduced to the system between the MSP® dehumidifying coil and fan. This will ensure that the dehumidifier receives stable air conditions with the highest possible temperature and moisture content.

Exhaust air should be utilized to ensure that the pool area remains under a negative pressure. A negative pressure is needed to prevent room air from being "pushed" through the wall cavity and condensing on cold surfaces and to minimize the migration of pool odors to adjacent areas. Exhaust air should be at least 10% higher than ventilation air volume.

An energy recovery ventilator (ERV) should be considered to reduce the cost of treating ventilation air.

AIR CHANGES

Four to six total air changes per hour are recommend in an indoor pool. A pool with spectators requires six to eight air-changes. The primary reason is to achieve good mixing of the dehumidified air and outside air, with room air. Air changes can also be provided with ceiling hung propeller fans and other air recirculation devices.

DEFOGGING

The goal of defogging is to raise the interior surface temperature of the windowpanes above the room dew point temperature. Double-pane glass is a minimum requirement. In colder climates, triple-pane and/or super insulating low-E glass should be used. Simply moving air across a windowpane will facilitate defogging. This air need not be furnished by the dehumidification system. A localized fan, or fan-duct arrangement, moving room air will do the job. The air terminal should be close to the glass to ensure maximum turbulence on the glass and optimum effectiveness.

CORROSION

HVAC equipment and duct corrosion occurs when moisture is present. To avoid the deleterious effects of corrosion, all surfaces that could be splashed upon or reach the dew-point temperature should be made of corrosion-resistant material or covered with a corrosion-resistant coat. Where possible keep ducts and equipment above the splash zone.

Ductwork carrying low temperature air should be insulated with a minimum of 1" foil faced fiberglass insulation to prevent the possibility of condensation.

SYSTEM COMPONENTS

The Nautica dehumidification and water heating system for indoor swimming pools include the necessary components and controls for a complete installation. Nautica furnishes the dehumidifying air handler, water-cooled condensing unit/water heater, wall-mounted humidity control, controls and installation manual for proper installation and operation. Water-cooled systems require a duct or unit -mounted heat recovery coil. For summer heat rejection, an optional water-side heat rejection dry cooler unit may be used for outdoor heat rejection. Air conditioning systems require a dedicated conventional outdoor air-cooled condensing unit, matched to the sensible cooling load.

The installer furnishes ducting, water piping, refrigerant and refrigerant piping, wiring, water pump, antifreeze solution and start up, service

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FIGURE 5 - DATA GATHERING WORKSHEET (EXAMPLE FOR 600 SQ. FT. POOL) # DATA REQUIRED SPA (s) POOL (P) EXAMPLE A Activity factor. Table 3 0.65 B Evaporation rate factor at 50% RH. Table 4 .048 C Evaporation rate factor at 60% RH. Table 4 .036 D Water surface area. Square feet. 600 E Pool water capacity. D x Avg. depth x 62.42 = #H2OLbs. 149,808 F Electric cost. $/KWH. $0.10 G Outside air quantity. CFM. (See ventilation) ** 200 H Active hours of operation. Total/week. 72 --- Active hours of operation. Maximum/day. 12 --- Pool room temperature. Table 2. 820F --- Heating load. MBTUH. 30,000 --- Cooling load. MBTUH. 24,000 --- Pool and/or spa cover. Y/N. N --- Water heating by Nautica system. Y/N. Y --- Water temperature. Table 2 800F

FIGURE 6 - ENGINEERING FORMULA WORKSHEET

DATA CALCULATED FORMULAS ACTUAL EXAMPLE I Inactive period evaporation rate at 50%. (BP x DP) + (BS x DS) 14.40 J Active period evaporation rate at 60%. (AP x CP x DP) + (AS x CS x DS) 14.04

--- Select model to meet the requirements at both conditions above. PDHA0204 FAN SELECTION

K CFM for selected model 665 L Total CFM. G + K 865 M Supply and return duct pressure drop 0.25” --- Total PD, inches water gauge L + M 1.37”

LOOP PUMP SELECTION --- Total GPM for selected model. 2.90 N Water PD for selected model 18.9’ O Piping loss. Feet of H2O. 6.0’ --- Total PD. Feet of H2O. N + O 29.9’

RATE OF POOL WATER TEMPERATURE RISE P Water BTUH for selected model 35,768 --- Rate of pool water temperature Rise. °F/Hr P/E 0.24

ESTIMATED ENERGY USE & OPERATING COST Q Comp. Efficiency at 50% RH for selected model 6.293 R Comp. Efficiency at 60% RH. Q x 1.15 7.237 S Annual evaporation at 50% RH. #H2O. (168-H) x I x 52 71,885 T Annual evaporation at 60% RH. #H2O. H x J x 52 52,566 --- Annual cost for dehumidification * [(S/Q) + (T/R)] x F $1,869 * --- Annual cost for water heating Free **

AIR CHANGES U Square feet of pool and deck area Room length x room width 1,200 V Cubic feet of space U x average ceiling height 12,000 W Air Changes *** (L*60)/V 4.3

* Fan power not included-add about 50% for continuous operation ** Introduction of outside air in cold weather will shorten dehumidifier run-time and may result in operation of auxiliary water heater.

Outside air should be heated and introduced to the system after the MSP® Dehumidifying Coil. *** Additional air may be needed to meet air change requirements. Consider using ceiling fans. NOTE: The basic level I Nautica system does not provide cooling. Use conventional means or consult with factory.

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TABLE 2 - TYPICAL NATATORIUM DESIGN CONDITIONS TYPE OF POOL AIR TEMP. 0F WATER TEMP. 0F RELATIVE HUMIDITY

Recreational 750 to 850 750 to 850 Therapeutic 800 to 850 850 to 950 Competition 780 to 850 760 to 820

Diving 800 to 850 800 to 900 Whirlpool/spa 800 to 850 970 to 1040

50% to 60%

TABLE 3 - WATER ACTIVITY FACTORS

TYPE OF POOL ACTIVITY FACTOR Residential 0.50

Condominium 0.65 Therapy 0.65

Hotel 0.80 Maximum Public Schools 1.00 Maximum Whirlpools Spa 1.00

Wave pools & waterslides 1.50 minimum

TABLE 4 - POOL EVAPORATION RATE FACTORS (LB/HR./SQ.FT.) AT 50% & 60% RH

POOL ROOM TEMPERATURE ºF 86ºF 85ºF 84ºF 83ºF 82ºF 81ºF 80ºF 79ºF 78ºF 77ºF 76ºF

POOL WATER TEMP. ROOM RELATIVE HUMIDITY %RH

ºF 50% 60% 50% 60% 50% 60% 50% 60% 50% 60% 50% 60% 50% 60% 50% 60% 50% 60% 50% 60% 50% 60%

78º 0.036 0.020 0.036 0.024 0.040 0.024 0.040 0.028 0.040 0.032 0.044 0.032 0.044 0.036 0.048 0.036 0.048 0.040 0.052 0.040 0.052 0.044

80º 0.044 0.028 0.044 0.032 0.048 0.032 0.048 0.036 0.048 0.036 0.052 0.040 0.052 0.040 0.052 0.044 0.056 0.048 0.056 0.048 0.060 0.052

82º 0.048 0.036 0.052 0.036 0.052 0.040 0.052 0.044 0.056 0.044 0.056 0.048 0.060 0.048 0.060 0.052 0.064 0.052 0.064 0.056 0.068 0.056

84º 0.056 0.040 0.060 0.044 0.060 0.048 0.060 0.048 0.064 0.052 0.064 0.056 0.068 0.056 0.068 0.060 0.072 0.060 0.072 0.064 0.072 0.064

86º 0.064 0.048 0.068 0.052 0.068 0.056 0.068 0.056 0.072 0.056 0.072 0.060 0.076 0.064 0.076 0.068 0.076 0.068 0.080 0.072 0.080 0.072

88º 0.072 0.060 0.076 0.060 0.076 0.064 0.076 0.064 0.080 0.068 0.080 0.072 0.084 0.072 0.084 0.076 0.088 0.076 0.088 0.080 0.088 0.080

90º 0.080 0.068 0.084 0.068 0.084 0.072 0.084 0.076 0.088 0.076 0.088 0.080 0.092 0.080 0.092 0.084 0.096 0.084 0.096 0.088 0.100 0.088

92º 0.092 0.076 0.092 0.080 0.096 0.080 0.096 0.084 0.096 0.084 0.100 0.088 0.100 0.092 0.100 0.092 0.104 0.096 0.104 0.096 0.108 0.100

94º 0.100 0.084 0.104 0.088 0.104 0.092 0.104 0.092 0.108 0.096 0.108 0.096 0.108 0.100 0.112 0.100 0.112 0.104 0.116 0.108 0.116 0.108

96º 0.112 0.096 0.112 0.100 0.116 0.100 0.116 0.104 0.116 0.104 0.120 0.108 0.120 0.112 0.120 0.112 0.124 0.116 0.124 0.116 0.128 0.120

98º 0.120 0.108 0.124 0.108 0.124 0.112 0.124 0.116 0.128 0.116 0.128 0.120 0.132 0.120 0.132 0.124 0.136 0.124 0.136 0.128 0.140 0.128

100º 0.132 0.120 0.136 0.120 0.136 0.124 0.136 0.124 0.140 0.128 0.140 0.132 0.144 0.132 0.144 0.136 0.148 0.136 0.148 0.140 0.148 0.140

102º 0.144 0.132 0.148 0.132 0.148 0.136 0.148 0.136 0.152 0.140 0.152 0.144 0.156 0.144 0.156 0.148 0.160 0.148 0.160 0.152 0.160 0.152

104º 0.156 0.144 0.160 0.144 0.160 0.148 0.160 0.152 0.164 0.152 0.164 0.156 0.168 0.156 0.168 0.160 0.172 0.160 0.172 0.164 0.176 0.164

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SYSTEM SPECIFICATIONS

GENERAL

Dehumidification system shall be Nautica model ___. System efficiency shall be a minimum of 5.75 pounds of condensed water per KWH of compressor power consumption. Dehumidifier air volume shall not exceed 45 CFM per pound of condensed moisture per hour.

Pool dehumidifying and water-heating system shall be manufactured by Nautica Dehumidifiers, Inc., and furnished with the following components.

DEHUMIDIFYING AIR-HANDLER

Dehumidifier shall be capable of removing ____ pounds of moisture per hour with inlet conditions of 82 DB/60% RH. Dehumidifier air volume shall be ___ CFM.

Cabinet shall be double wall, constructed of 20-gauge galvanized steel exterior with 20-gauge galvanized steel interior skin. Insulation shall be sandwiched between interior and exterior surfaces. All interior wall openings and seams that could allow passage of humid air into the insulated space shall be double-sealed to prevent the possibility of internal wall condensation. Access shall be provided for inspection and service access to all components.

Insulation shall be 1" thick, 3-pound density, fiberglass and shall comply with NFPA-90A for flame spread, smoke development and fuel contribution.

MSP® Dehumidifying coil

Unit shall be furnished with an MSP® dehumidifying coil. Coil to comprise a cooling coil for dehumidifying the air, air-to-air heat exchangers for precooling and reheating the air and a manifold assembly to direct the air through its intended path. Dehumidifiers using hot gas for reheat shall not be acceptable.

Air-to-Air heat exchanger shall be stationary, plate-type utilizing MSP® (multiple small plate) technology. The heat transfer media shall be constructed of 1100 series aluminum. To ensure complete drainage of condensate and no standing water, heat exchangers shall be positioned so that condensate flows downward through the heat exchanger, at an angle between vertical and 45 degrees. Pressure drop through air-to-air heat exchangers shall be no greater than 0.14” Wc, with 77% sensible efficiency, equal flow rates, 70 deg Fahrenheit temperature difference and 50% RH on the condensing pass

Cooling coil shall be ARI-rated direct expansion type with 3/8”, ½”, or 5/8” OD copper tubes, aluminum fins. Air shall pass through a minimum of 6 rows of coil. Fin spacing shall not exceed 12 fins per inch. Coil position shall be arranged to ensure that each circuit is exposed to equal loads. DX coils shall have pressure-type brass distributors and solder connections shall be provided. Coil face velocity shall not exceed 500 FPM. DX coils shall be provided with externally equalized thermostatic expansion valve for maximum cooling effectiveness.

Condensate drain pan shall be insulated heliarc welded minimum 18-gauge stainless steel type 304. Pan shall be pitched to ensure no standing water.

Thermostatic expansion valve shall be provided for maximum cooling effectiveness.

DEHUMIDIFIER FAN

Dehumidifier fan shall be AMCA rated ______ type. Fan shall be rated at ____ CFM and ___ inches Wc.

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WATER HEATING CONDENSING SECTION (loop water heating

Water heater shall be capable of providing ___ MBH of heating.

(For rapid warming of pool water, a field furnished second stage auxiliary water heater shall be provided by others. A contact closure for this auxiliary heater shall be provided by the control system).

Compressor shall be R-22 hermetically sealed, reciprocating, suction-cooled. Compressor shall be equipped with suction and discharge service valve. Compressor electrical circuit shall be equipped with overload protection, high and low pressure safety controls.

Water-cooled condenser shall be brazed plate type with stainless steel plates to protect against corrosion. Condenser shall be rated to maintain a maximum 120○-Fahrenheit condensing-temperature.

HEAT RECOVERY COIL (room air heating)

Heat recovery coil shall be provided in supply air stream of air handler. Coil is designed to reject heat to the room when pool water temperature is satisfied.

HEAT RECOVERY HEAT EXCHANGERS (pool water heating)

Heat recovery heat exchangers shall be provided for field installation in pool and/or spa water circuits.

CONTROL SYSTEM

Control system shall be designed to optimize energy consumption and provide precise control of humidity, water temperature and space temperature. Control system to be designed to provide full-integrated control of auxiliary water heating, air heating and air-cooling components.

Control system shall be complete with humidity, space, and pool water temperature sensors. Auxiliary contacts shall be provided for room cooling, final-stage room heating and final stage water heating.

AIR CONDITIONING (OPTION)

Cooling coil shall be provided in supply air stream of air handler. Cooling coil shall be direct expansion or chilled water type with 5/8”, 1/2" or 3/8" OD copper tubes. Cooling coil shall be coated for corrosion resistance. Coil face velocity is not to exceed 500 FPM.

Thermostatic expansion valve shall be provided for maximum cooling effectiveness.

Condensate drain pan shall be insulated 18-gauge stainless steel. Pan shall be pitched to ensure no standing water.

OUTDOOR HEAT REJECTION (OPTION)

Outside heat rejection dry-cooler shall be provided for outside heat rejection. Dry cooler shall be designed to reject heat to outdoors, in summer, when pool water temperature and space heating are satisfied.

To prevent the possibility of freezing in colder climates, the system shall be filled with a suitable antifreeze solution. Antifreeze solution and installation to be provide by others.

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AIR AND WATER-COOLED PACKAGED DEHUMIDIFIERS

Table 1 Air and water-cooled packaged dehumidifiers selection MODEL CAPACITY AIRFLOW POWER MRE *DRIP-4A LB/H SCFM KW LB/KWH

4-22** 17.3 1,000 2.80 6.186-30** 23.3 1,000 3.45 6.758-41** 32.7 1,120 4.90 6.679-44** 34.8 1,260 5.00 6.96

10-49** 38.6 1,400 5.84 6.6112-56** 43.6 1,680 6.63 6.5816-81** 63.6 2,240 7.86 8.09

24-121** 95.5 3,360 11.65 8.2032-156** 122.8 4,480 15.84 7.7548-240** 189.4 6,720 24.59 7.70

** Insert Heat rejection configuration (Figures 1-4)* Moisture Removal Efficiency

For use in indoor swimming pools, specify "coated units"

Figure 1 – Heat rejection options for packaged dehumidifiers

COIL

COMPRESSOR

MSP®

COIL

COIL

COMPRESSOR

MSP®

COIL

AIR COOLEDCONDENSER

COIL

COMPRESSOR

MSP®

COIL

CONDENSER

POOL WATERHEATING CIRCUIT

COIL

COMPRESSOR

MSP®

COIL

WATERLOOP

OPTION 3 - INDOOR AIR REJECTIONOPTION 1 - INDOOR AIR & WATER REJECTION

OPTION 2 - INDOOR AIR & WATER REJECTION OPTION 4 - INDOOR AIR & OUTDOOR REJECTION

REFER TO BACK OF “DEHUMIDIFIERS” SECTION FOR DETAILED SELECTION DATA ON INDIVIDUAL AIR COOLED SPLIT (DRIA) UNITS.

SPECIFY “COATED” UNITS FOR INDOOR POOLS AND OTHER CORROSIVE ENVIRONMENTS

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AIR -COOLED SPLIT DEHUMIDIFIERS

Table 2 - Air -cooled split dehumidifier selection MODEL CAPACITY AIRFLOW POWER CONDENSING UNIT MRE *DRIA-4A LB/H SCFM KW NOMINAL TONS LB/KWH06-030A 22.9 1,000 3.11 2.5 7.3806-036A 25.3 1,000 3.84 3.0 6.5808-042A 30.1 1,120 4.24 3.5 7.1109-048A 33.8 1,260 4.97 4.0 6.8010-060A 40.3 1,400 5.97 5.0 6.7515-072A 52.3 2,100 7.14 6.0 7.3216-090A 65.6 2,240 8.91 7.5 7.3624-120A 92.1 3,360 12.80 10.0 7.2028-150A 106.6 3,920 15.68 12.5 6.8032-180A 130.5 4,480 18.68 15.0 6.9948-240A 180.0 6,720 26.00 20.0 6.92

* Moisture Removal EfficiencyFor use in indoor swimming pools, specify "coated units"

Figure 2 – Air-cooled split system

MSPTM

COIL

SU

CTI

ON

LIN

ELI

QU

ID L

INE

REFER TO BACK OF “DEHUMIDIFIERS” SECTION FOR DETAILED SELECTION DATA ON INDIVIDUAL AIR COOLED SPLIT (DRIA) UNITS.

SPECIFY “COATED” UNITS FOR INDOOR POOLS AND OTHER CORROSIVE ENVIRONMENTS