PoolPak R-410A SWHP Series User manual

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POOLPAK R-410A
SWHP SERIES
(MODELS SR, S, SE, SEP)
Engineering Guide
Packaged Natatorium Environment Control System
PoolPakTM SWHP Series
Natatorium Dehumidication Unit
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For unit weights and dimensions, see PoolPak SWHP Weights and Dimensions Guide.

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3491 Industrial Drive . York, PA 17402 . USA . 800-959-7725 . Fax [phone]
for more information: www.poolpak.com
The Leader in Indoor Pool Dehumidication
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TABLE OF CONTENTS
SECTION I: INDOOR POOL APPLICATION..............................................................................................................1
Introduction .................................................................................................................................................................................. 1
Creating an ideal environment for indoor pool facilities............................................................................................................ 1
Operating Cost ......................................................................................................................................................................... 1
Application ................................................................................................................................................................................... 1
Moisture Loads ........................................................................................................................................................................ 1
Effects of Moisture ................................................................................................................................................................... 1
Indoor Air Quality...................................................................................................................................................................... 1
Occupant Comfort .................................................................................................................................................................... 2
Pool Water Chemistry ............................................................................................................................................................. 2
Equipment Choices...................................................................................................................................................................... 3
Overview ................................................................................................................................................................................. 3
Ventilation with Heating ........................................................................................................................................................ 3
Ventilation with Heating and Energy Recovery..................................................................................................................... 3
Mechanical Dehumidication................................................................................................................................................ 3
Hybrids.................................................................................................................................................................................. 4
Other Technologies............................................................................................................................................................... 4
Room Air Distribution ................................................................................................................................................................... 4
Airside Design .......................................................................................................................................................................... 4
Supply Air.............................................................................................................................................................................. 5
Return Air.............................................................................................................................................................................. 6
Ductwork Design................................................................................................................................................................... 6
Air Distribution ...................................................................................................................................................................... 6
Air Connections to PoolPak™ .............................................................................................................................................. 7
Other Air-side Considerations............................................................................................................................................... 7
SECTION II: POOLPAK PRINCIPLES, FUNCTIONS, AND FEATURES ..................................................................8
Principles of Operation................................................................................................................................................................. 8
Room Dew Point Control.......................................................................................................................................................... 9
PoolPak™ Operation................................................................................................................................................................ 10
Standard Items Factory Mounted ......................................................................................................................................... 10
Standard Items Factory Supplied for Field Installation ......................................................................................................... 10
System Options .................................................................................................................................................................... 10
ECC Control System.................................................................................................................................................................... 12
Overview .................................................................................................................................................................................. 12
Humidity Control....................................................................................................................................................................... 12
Cold Surface Temperature Humidity Reset.............................................................................................................................. 13
Space Heating.......................................................................................................................................................................... 13
Networking Multiple Units ........................................................................................................................................................ 13
Smart Economizer (SR) ........................................................................................................................................................... 13
Space Cooling (optional).......................................................................................................................................................... 13
Air Conditioning with Air-Cooled Condenser ........................................................................................................................13
Air Conditioning with Water-Cooled Condenser .................................................................................................................. 14
Air Conditioning with Chilled Water Coil .............................................................................................................................. 14
Pool Water Heating .................................................................................................................................................................. 14
Smart Pump Control................................................................................................................................................................. 14
Occupied/Unoccupied Control Mode ....................................................................................................................................... 14
Purge Mode (SR and SEP) ...................................................................................................................................................... 14
CO2 Based Demand Ventilation .............................................................................................................................................. 14
Event Mode (SR) ..................................................................................................................................................................... 14
Selection ...................................................................................................................................................................................... 16
Overview .................................................................................................................................................................................. 16
Available Congurations....................................................................................................................................................... 16
Unit Selection Software Program ............................................................................................................................................. 16

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SECTION III: SIZING AND PERFORMANCE ............................................................................................................17
PoolPak SWHP Unit Dimensions and Weight ............................................................................................................................. 17
PoolPak SWHP Unit Capacity ..................................................................................................................................................... 17
Pool Water Condenser Pressure Drop and Heat Capacity.......................................................................................................... 18
PoolPak Auxiliary Gas Furnace Capacity .................................................................................................................................... 19
PoolPak Auxiliary Electric Heat Capacity..................................................................................................................................... 19
PoolPak Air-Cooled Condenser (ACC) Dimensions, Weight and Electrical................................................................................. 20
Water-Cooled Condenser (WCC) ................................................................................................................................................ 26
SECTION IV: INSTALLATION ....................................................................................................................................29
Overview...................................................................................................................................................................................... 29
Handling ................................................................................................................................................................................... 29
Rigging ..................................................................................................................................................................................... 29
Clearance................................................................................................................................................................................. 29
Foundation ............................................................................................................................................................................... 30
Inspection................................................................................................................................................................................. 30
Unit Hookup.............................................................................................................................................................................. 30
Gas Furnace Auxiliary Heat (Optional) ................................................................................................................................. 30
Power Supply........................................................................................................................................................................ 30
Single Point Power Supply ................................................................................................................................................... 31
Dual Point Power Supply...................................................................................................................................................... 31
Control Wiring....................................................................................................................................................................... 31
Condensate Piping ............................................................................................................................................................... 31
Curb Mounting ...................................................................................................................................................................... 31
ECCIII Controls Field Wiring........................................................................................................................................................ 32
Overview .................................................................................................................................................................................. 32
Remote Interface Unit (1)......................................................................................................................................................... 32
Outside Air Temperature and Relative Humidity Sensor (2)..................................................................................................... 33
Cold Surface Temperature Sensor (3)...................................................................................................................................... 33
Smoke Purge Input (SR only) (4) ............................................................................................................................................. 34
Fire Trip Input (5)...................................................................................................................................................................... 34
Occupied Mode Input (6).......................................................................................................................................................... 34
Purge Mode Input (SR and SEP) (7)........................................................................................................................................ 34
Remote Exhaust Fan Interlock (S only) (8) .............................................................................................................................. 34
Alarm Output (9)....................................................................................................................................................................... 34
Auxiliary Pool Water Heating System (10) ............................................................................................................................... 34
Auxiliary Air Heating System (11) ............................................................................................................................................. 35
System 1 Remote Air-Cooled Condenser Interlock and Control (12)....................................................................................... 35
System 2 Remote Air-Cooled Condenser Interlock and Control (13)....................................................................................... 35
Auxiliary Air Heat Control Valve (14) ........................................................................................................................................ 35
Building Automation System Connection (15) .......................................................................................................................... 35
Multi-unit Network Connection (Multi-unit installations only) (16)............................................................................................. 35
System 1 Remote Water-Cooled Condenser Interlock (If equipped) (17)................................................................................ 36
System 2 Remote Water-Cooled Condenser Interlock (If equipped) (18)................................................................................ 36
Pool Water Temperature Sensor (19)....................................................................................................................................... 36
Smart Pump Control Output (20).............................................................................................................................................. 36
Event Mode (21)....................................................................................................................................................................... 36
Summer Vent Mode (22) .......................................................................................................................................................... 36
Supply Temperature Sensor (not shown)................................................................................................................................. 36
SWHP Field Wiring Diagram.................................................................................................................................................... 37
Pool Water Piping And Installation............................................................................................................................................... 38
PoolPaK Pool Water Circulation Loop...................................................................................................................................... 38
Auxiliary Pool Water Heater (eld supplied)............................................................................................................................. 38
Main Pool Water Pump and PoolPak Pool Water Loop Pump Interlocks................................................................................. 38
Pool Water Isolation Valves...................................................................................................................................................... 38
Pool Water Flow Switch ........................................................................................................................................................... 39
Pool Water Piping Composition................................................................................................................................................ 39
Freeze Protection..................................................................................................................................................................... 39
Condensate Drains And Piping .................................................................................................................................................... 40

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Air-Cooled Condenser Installation ............................................................................................................................................... 41
Space and Location Requirements .......................................................................................................................................... 41
Walls or Obstructions............................................................................................................................................................ 41
Multiple Units ........................................................................................................................................................................ 41
Units in Pits........................................................................................................................................................................... 42
Decorative Fences................................................................................................................................................................ 42
Field Installed Piping ................................................................................................................................................................ 43
Piping Guidelines.................................................................................................................................................................. 43
SECTION V: OPERATION ..........................................................................................................................................47
Remote Interface Unit (RIU) ........................................................................................................................................................ 47
Service Display Connection ..................................................................................................................................................... 47
Multiple Unit Interfacing............................................................................................................................................................ 47
Building Automation System (BAS) Connection....................................................................................................................... 48
PoolPak Remote Access Package (RAP) ................................................................................................................................ 48
Send Emails – Alerts for Alarms............................................................................................................................................... 48
ECC III Network Operation .......................................................................................................................................................... 48
CM1 Conguration ................................................................................................................................................................... 49
RIU Conguration..................................................................................................................................................................... 49
Network Conguration.............................................................................................................................................................. 50
Network Ctl - No (Yes or No) ............................................................................................................................................... 50
Water Temp Ctl - Local (Local or Net) .................................................................................................................................. 50
Changing Network Set Points .................................................................................................................................................. 50
ECC III Service Troubleshooting.................................................................................................................................................. 51
Troubleshooting Overview........................................................................................................................................................ 51
Alarm Reset.............................................................................................................................................................................. 51
Supply Fan Not Running ...................................................................................................................................................... 51
Return Fan Not Running (SR only)...................................................................................................................................... 51
Fire Trip Active ..................................................................................................................................................................... 52
Smoke Purge Active ............................................................................................................................................................ 52
Return Air Temperature Out of Range ................................................................................................................................. 52
Supply and Return Fans Not Running ................................................................................................................................. 52
Freeze Danger, Low Supply Air Temperature ...................................................................................................................... 52
Low Compressor Oil Pressure (Recip Compressors only) ................................................................................................... 52
High Compressor Motor Temperature .................................................................................................................................. 52
High Refrigerant Pressure .................................................................................................................................................... 52
Low Refrigerant Pressure .................................................................................................................................................... 52
Compressor Current Transducer Failed ............................................................................................................................... 52
10 Fault Compressor Lockout .............................................................................................................................................. 53
Sensor Failure (All Sensors) ................................................................................................................................................ 53
Expansion Board Comm Failure .......................................................................................................................................... 53
Fault History Log ..................................................................................................................................................................... 53
Manual Control ........................................................................................................................................................................ 54
Digital Output ....................................................................................................................................................................... 54
Analog Output ...................................................................................................................................................................... 55
System Status Information ...................................................................................................................................................... 56
Data Log Retrieval.................................................................................................................................................................... 59
Maintenance ................................................................................................................................................................................ 60
Overview .................................................................................................................................................................................. 60
Daily Maintenance.................................................................................................................................................................... 60
Monthly Maintenance ............................................................................................................................................................... 60
Annual Maintenance................................................................................................................................................................. 61
SECTION VI: WIRING.................................................................................................................................................63
Single Point Power Connection ................................................................................................................................................... 63
Dual Point Power Connection...................................................................................................................................................... 63
Remote Connections ................................................................................................................................................................... 64
Multiple Unit Interface .................................................................................................................................................................. 65

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LIST OF FIGURES
Figure 2-1. Dew Point Control Psychrometric.............................................................................................................................. 9
Figure 2-2. SWHP SR System Schematic................................................................................................................................... 11
Figure 2-3. SWHP SEP System Schematic................................................................................................................................. 11
Figure 2-4. Typical PoolPak™ Rooftop Installation...................................................................................................................... 15
Figure 3-1. Air Cooled Condenser Dimensions - End View ......................................................................................................... 25
Figure 3-2. Air Cooled Condenser Dimensions - Side View ....................................................................................................... 25
Figure 3-3. Remote Cooling Tower Dimensions .......................................................................................................................... 26
Figure 3-4. PoolPak™ Optional Water-Cooled Condenser Cabinet - Attached........................................................................... 27
Figure 4-1. Field Wiring Diagram................................................................................................................................................. 37
Figure 4-2. Pool Water Piping Schematic .................................................................................................................................... 39
Figure 4-3. Negative Pressure Condensate Piping Schematic.................................................................................................... 40
Figure 4-4. Remote ACC Installation Around Walls or Obstructions............................................................................................ 41
Figure 4-5. Remote ACC Installation When Installing Multiple Units ........................................................................................... 41
Figure 4-6. Remote ACC Installation When Installing Units in Pits.............................................................................................. 42
Figure 4-7. Remote ACC Installation When Installing Units Near Decorative Fences................................................................. 42
Figure 4-8. Remote ACC Above Unit ........................................................................................................................................... 44
Figure 5-1. Remote Interface Unit Graphic.................................................................................................................................. 47
Figure 5-2. Data Retrieval Using USB Key.................................................................................................................................. 59
Figure 6-1. Single Point Power Connection................................................................................................................................. 63
Figure 6-2. Dual Point Power Connection ................................................................................................................................... 63
Figure 6-3. Remote Connections................................................................................................................................................. 64
Figure 6-4. Multiple Unit Interface................................................................................................................................................ 65
LIST OF TABLES
Table 1-1. Typical Pool Water and Air Temperature Set-Points ................................................................................................... 2
Table 1-2. Recommended Pool Water Chemistry........................................................................................................................ 3
Table 3-1. PoolPak™ SWHP Unit Capacity................................................................................................................................. 17
Table 3-2. Pool Water Condenser Pressure Drop and Heat Capacity ......................................................................................... 18
Table 3-3. PoolPak™ Auxiliary Gas Furnace Capacity ................................................................................................................ 19
Table 3-4. PoolPak™ Auxiliary Electric Heat Capacity ................................................................................................................ 19
Table 3-5. ACC - Model SWHP 0060 ........................................................................................................................................... 20
Table 3-6. ACC - Model SWHP 0080 ........................................................................................................................................... 20
Table 3-7. ACC - Model SWHP 0100 ........................................................................................................................................... 21
Table 3-8. ACC - Model SWHP 0120 ........................................................................................................................................... 21
Table 3-9. ACC - Model SWHP 0140 ........................................................................................................................................... 22
Table 3-10. ACC - Model SWHP 0190 ......................................................................................................................................... 22
Table 3-11. ACC - Model SWHP 0220 ......................................................................................................................................... 23
Table 3-12. ACC - Model SWHP 0260 ......................................................................................................................................... 23
Table 3-13. ACC - Model SWHP 0300 ......................................................................................................................................... 24
Table 3-14. ACC - Model SWHP 0340 ......................................................................................................................................... 24
Table 3-15. Remote Water Cooled Condenser Dimensions ........................................................................................................ 26
Table 3-16. WCC Piping Connections.......................................................................................................................................... 26
Table 3-17. Water Cooled Condenser Performance .................................................................................................................... 28
Table 4-1. Pipe Sizes for Remote Refrigerant Condensers ......................................................................................................... 44
Table 4-2. Remote ACC Refrigerant (R-410A) Charge ................................................................................................................ 45
Table 4-3. Refrigerant (R-410A) Charge for Different Line Sizes................................................................................................. 45
Table 5-1. Recommended Pool Water Chemistry........................................................................................................................ 60

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SECTION I: INDOOR POOL APPLICATION
INTRODUCTION
CREATING AN IDEAL ENVIRONMENT FOR INDOOR POOL FACILITIES
Indoor pool facilities are unlike any other structure in design, construction and maintenance requirements. Humidity, air
and water temperatures are especially difcult to control, and improper management usually results in an uncomfortable
environment, excessive operating costs and possibly serious structural damage. Effectively controlling these special
conditions require control hardware and control sequences specially engineered for large commercial indoor pool
applications. The PoolPak™ System utilizes an environmental control package designed to meet all special needs of the
indoor pool environment, while reducing energy usage and building maintenance costs.
OPERATING COST
Energy consumption is a direct function of the variables necessary to satisfy the occupant and protect the facility.
These variables include space heating and cooling, water heating, humidity removal and ventilation. Maintaining ideal
and precise environmental conditions has a fairly high cost of operation. A majority of the indoor pools, regardless of
geographic location, require water and space heating 70% to 90% of the year.
APPLICATION
MOISTURE LOADS
An indoor swimming pool produces large quantities of water vapor through evaporation, which accounts for roughly
95% of the pool water heat loss, making the water colder. This excessive humidity will form damaging condensation
unless removed from the building. In the past, the method of removing this water vapor was by ventilating an otherwise
energy efcient building, exhausting the humid air and the energy it contained. Additional energy was used to bring in
and heat the make-up air and to heat the pool water.
More cost effective technologies offer an alternative method adding heat exchangers and mechanical heat recovery
systems with many useful options. The ideal solution to removing the water vapor from the pool area is to convert the
latent (wet) heat contained in the moist air back into sensible (dry) heat, placing it back into the pool water and air.
EFFECTS OF MOISTURE
Excess humidity in natatorium structures may be readily apparent as condensation on cool surfaces such as windows and
outside doors, the growth of mildew or mold and when coupled with poor pool chemistry, the accelerated corrosion of
metals. In its less obvious forms, moisture may penetrate walls and ceilings and cause rot that becomes noticeable only
when large scale structural failure occurs. Humidity levels are also a major factor in the comfort of pool users.
INDOOR AIR QUALITY
Pools and water parks with water features have a higher evaporation rate than a standard pool because of the increased
water surface area. Chloramines (See Pool Water Chemistry below), which are present in the water, become more
concentrated in the air as the “water to air” interactions increase, affecting the indoor air quality. To control the buildup
of chloramines and gases in an enclosed poolroom, the space must have an adequate supply of outside air or ventilation
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A strong “chlorine” odor is an indicator of poor pool water chemistry and is generally offensive to the occupants. Higher
levels of chloramines can cause skin/eye irritation and respiratory problems commonly known as “lifeguard lung”.
Most poolrooms are designed with a minimum ventilation rate to dilute the airborne pollutants generated from the
chemical interactions in the pool water. Typically these rates are based on ASHRAE standard 62.1 and dictated by local
codes at about 0.5 CFM/square foot of pool and deck area, but depending on the pool water chemistry the ventilation rate
may not always be adequate for good poolroom IAQ.
However, increasing ventilation rates can signicantly add to the cost of operation. Energy conservation strategies such
as heat recovery, airow measurement and CO2 based control help control costs while improving IAQ.
Depending on the geographic location and season of the year, treating the outside air has a direct effect on energy
consumption. Some facilities prefer higher than minimum ventilation rates, up to 100% of OA, to maximize indoor air
quality, but the cost of treating this air can be signicant.
OCCUPANT COMFORT
Occupant comfort in a natatorium is easy to understand. If you ever swam in an outdoor pool on a cold, windy day
or exited a pool in a dry, desert location you will probably notice an immediate chill. The opposite is true where high
humidity is not adequately controlled either through ventilation or by mechanical means. The moisture level can
reach such a state where it is oppressive or stuffy. Common complaints are difculty in breathing and the room being
perceived to be warmer than the actual dry bulb temperature would suggest.
Regardless of the source of discomfort, users will not enjoy the facility if water/air temperatures and humidity levels
are not within a narrow range. Ideal water temperature is around 82°F with the air temperature about 2˚F higher to
prevent chilling when exiting the pool and to minimize evaporation from the pool surface. Refer to Table 1 for some
recommended temperatures for poolrooms, which can be adjusted to meet specic needs of bathers. In general, “active”
poolrooms are maintained at lower temperature ranges so the users don’t overheat, while warmer temperatures are more
common for seniors or children or less active pools.
The desirable humidity range is generally between 50 and 60%. A humidity level greater than 60% can create a sticky
feeling and difculty breathing. A humidity level lower than 50% will result in evaporative cooling on the bather’s skin,
creating a chill. Poor air movement caused by improper duct placement within the poolroom will also lead to occupant
discomfort. Excessive supply air blowing on bathers can create drafts, while uneven air distribution may create stagnant
zones within the space.
Table 1-1. Typical Pool Water and Air Temperature Set-Points
Water Temp. oFAir Temp. oF Room RH %
Recreational Pools 80-85 Water Temp + 2 55-60
Therapy Pools 86-92 86155-60
Whirlpools 99-104 86155-60
1Normally max 86 oF to minimize overheating of occupants
POOL WATER CHEMISTRY
Water chemistry in swimming pools is critical for the health of the bathers and the condition of the enclosure and
components. An enclosure with poor water chemistry has a noticeable “chlorine” smell, which is an indication of high
chloramines in the air. Not only does this have an effect on the water, but it affects the bathers and the air they breathe.
Dehumidication/ventilation equipment is not designed to remedy the effects of poor pool chemistry, but is designed to
deliver prescribed ventilation to manage smaller amounts of pollutants generated from normal pool activity. Pool water
chemistry is a part of daily maintenance and it is recommended that the users follow the current National Spa and Pool
Institute standards. See “Indoor Pool Water Chemistry – Controlling Chloramines with Proper Chlorine Management,”
MK2-BROPOOLCHEM, for more information on pool water chemistry.

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Table 1-2. Recommended Pool Water Chemistry
Pool Spa
Ideal Min Max Ideal Min Max
Total Chlorine (ppm) 1.0 - 3.0 1 3 3.0 - 5.0 1 10
Free Chlorine (ppm) 1.0 - 3.0 1 3 3.0 - 5.0 1 10
Combined Chlorine (ppm) 0 0 0.3 0 0 0.3
Bromine (ppm) if applicable 2.0 - 4.0 2 4 3.0 - 5.0 2 10
pH 7.4 - 7.6 7.2 7.8 7.4 - 7.6 7.2 7.8
Total Alkalinity (ppm) 80 - 100 80 180 80 - 100 60 180
TDS (ppm) 1000 - 2000 300 3000 1000 - 2000 300 3000
Calcium Hardness (ppm) 200 - 400 150 1000 200 - 400 150 1000
Calcium Acid (ppm) 30 - 50 10 100 30 - 50 10 100
EQUIPMENT CHOICES
OVERVIEW
There are several methods for controlling humidity, temperature and ventilation in poolrooms. Each method offers some
level of control, but there can be signicant differences in rst cost and operating cost of each method. Geographic
location, degree of comfort, unit cost and operational cost must be evaluated in the selection of the correct system.
Ventilation with Heating
• Moisture removal is accomplished through the dilution with dryer outside air
• High cost of operation (air reheating)
• Lowest rst cost
• No opportunity to recover energy in the ventilation airstream
• No opportunity to recover energy into the pool water
• No integral cooling capability
• Summer space conditions can be unbearably hot and humid
Ventilation with Heating and Energy Recovery
• Moisture removal is accomplished through the dilution with dryer outside air
• Signicant heat recovery from ventilation air stream
• Cost-effective method but with modest operating cost
• Performance limitations in humid areas or during summer peaks
• No opportunity to recover energy into the pool water
• No integral cooling capability
Mechanical Dehumidication
• Moisture removal is accomplished through mechanical refrigeration
• Signicant heat recovery using “heat pump” technology
• Recovers the most energy from the ventilation airstream
• Offers an opportunity to recover energy into the supply airstream
• Offers an opportunity to recover energy into the pool water
• Higher rst cost with lower operating cost
• No performance limitations based on location
• Tightest control of setpoint conditions
• Integral cooling capability
• Can be integrated to include appropriate ventilation strategies

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Hybrids
• Combines various technologies to increase efciency and capability
• Utilizes ventilation as primary dehumidication method
• Switches to heat pump method when conditions require better environmental control
Other Technologies
Desiccant technology can be adapted to provide super dry air which is injected into the poolroom to dilute the moisture
load. The regeneration phase of the desiccant is typically driven by waste heat from refrigeration cycle or other fossil
fuel.
Wheels are sometimes considered because of their wide acceptance as heat recovery devices. Latent or Enthalpy wheels
are not suitable for pools, but sensible wheels may have application.
ROOM AIR DISTRIBUTION
All PoolPak™ models provide continuous air recirculation, and with a good air distribution system, will promote
uniform space conditions. To remove the required moisture and maintain controlled conditions, it is essential that there
be adequate air movement and distribution in the natatorium. The unit must remove the humid air from the pool area
and discharge the dehumidied air back into it. The supply air should be distributed over areas subject to condensation
(windows, outside walls, support trusses, skylights, etc.).
AIRSIDE DESIGN
The supply air volume and external static pressure capability of the fan is given for each model in the Performance
Section. It is recommended that an experienced engineering or mechanical contracting rm do the design, sizing and
layout of the duct system.
The recommended volume of supply air should provide three to eight air changes an hour. However, in larger waterparks
or spaces with high sensible heat gain, higher airows may be appropriate. Lower air volumes require more care to avoid
short cycling the air between the return and supply, air stratication and pockets of high humidity.
The most even control of space conditions occurs with proper air distribution and a proper air ow rate. This provides
space control without excessive loading and unloading of refrigerant-based dehumidication equipment.

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Supply Air
After dehumidication, dry air is supplied back to the room. Supply air should be distributed from ducting around the
perimeter (see Figure 1-1) of the space. The two options for perimeter supply air distribution are overhead (see Figure
1-2) or below grade (see Figure 1-3).
Figure 1-1. Perimeter Air Distribution
The warm, dry air should be directed over outside walls, windows and other surfaces susceptible to condensation. Supply
ducts should be as short and with as few turns as possible. Use turning vanes to minimize air noise and static pressure
drop.
Recommended maximum supply duct air velocity is 1000 FPM. The recommended velocity from diffusers is 300 to 500
FPM. Air velocities in ducts should be kept as low as is reasonable to avoid excessive noise in the ducts. In multiple unit
installations, supply air from each unit may go into a common supply duct or into a plenum. The duct should be attached
with a exible connection to minimize vibration transmission.
Figure 1-2. Overhead Air Distribution Figure 1-3. Below Grade Air Distribution
SUPPLY AIR BLOWING
DOWN FROM SOFFIT DUCTS
COVERING WINDOWS AND
MOISTURE-EXPOSED AREAS
SUPPLY AIR
TO SKYLIGHTS
POOLPAK
DEHUMIDIFICATION
SYSTEM
RETURN AIR
RETURN AIR
SUPPLY AIR
TO SKYLIGHTS
POOLPAK
DEHUMIDIFICATION
SYSTEM
SUPPLY AIR BLOWING UP
FROM BELOW-GRADE
DUCTS COVERING WINDOWS
AND MOISTURE-EXPOSED
AREAS
Sky Light

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Return Air
The unit will operate most efciently in a natatorium where the supply and return openings are placed diagonally
opposite each other. All ducting should be done in accordance with acceptable practices. Return air ducts in the section
just prior to entering the unit return air opening and elbows in both the return and supply air ducts must comply with the
guidelines set forth in SMACNA HVAC Duct Construction Standards Metal and Flexible – Third Edition, Chapter 4.
Ductwork Design
All supply and return duct work to the unit should be installed such that no condensate occurs on the duct work. Duct
turns and transitions must be made carefully to keep friction losses to a minimum. Duct elbows should contain splitters
or turning vanes and avoid short radius ttings.
Duct work that is connected to the fan discharge should run in a straight line with proper transitions, and minimum
distances to elbows as recommended by SMACNA and should not be reduced in cross-sectional area. Never deadhead
the fan discharge into the at side of a plenum.
Duct work attached to the PoolPak™ unit return air connection must be done in accordance with SMACNA
recommended standards and /or generally accepted industry practice.
Supply and return duct work should have all seams sealed before applying insulation to the exterior of the duct work.
The insulation’s seams must be sealed, wrapped, and mastic coated. Use of pre-insulated duct work (interior) is
acceptable if it meets local codes; however, all seams must be sealed prior to startup.
Air Distribution
Supply outlets and return grilles should be carefully placed to avoid short-circuiting in the space. Short-circuiting
creates stagnant areas where humidity and temperatures may build up to undesirable levels, reducing the effectiveness
of the PoolPak™ System. Return grilles can be placed high in the space to reduce return ductwork, however removal of
chloramines from the occupied area has become much more of a design consideration and so low returns are favored by
poolroom designers.
Supply air should be directed 45 degrees up and down (most of the air will be directed downward) toward exterior walls,
windows, skylights, and other areas where stagnant conditions could cause humidity buildup and condensation problems
or drafts (see Figure 1-4). The end result of the supply air ducts is to wash the surfaces of the pool room that are prone to
condensation with the warm, dry supply air.
Figure 1-4. Supply Air Proportions
20% OF SUPPL
Y
AIR DIRECTED
ALONG CEILING
80% OF SUPPLY
AIR DIRECTED
DOWN WALLS
WINDOW
SURFACE
12”

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Diffusers for supply ducts located overhead (as opposed to under the deck) must be sized such that the supply air will be
thrown all the way to the deck and wash the entire wall surface from supply duct to the oor.
As a rule, directing the supply air at or across the pool surface increases the evaporation rate. To control the buildup of
chloramines at the surface of the pool, some air may be directed at the pool surface. Supply outlets should not discharge
directly onto surfaces where drafts may be created that will blow on swimmers walking along the edges of the pool.
Spectators should have supply air directed toward their faces.
Air Connections to PoolPak™
PoolPak™ outside air intake and exhaust air openings may have rain hoods if the unit is mounted outdoors. Rain hood
locations are illustrated on the unit arrangement drawings. The intake and exhaust should be screened to prevent the
entrance of foreign matter and arranged to avoid recirculation of exhaust and outside air. Also, when auxiliary gas heat is
selected (in an outside installation), a combustion air louver or rain hood is provided.
Supply, return, outside, and exhaust air ductwork connections over 5 feet long must be supported to avoid damage
to unit. Short, exible connections of rubber or canvas can be made between the return duct and the unit to eliminate
vibration transmission through the duct.
PoolPak™ International does not recommend the use of equipment rooms or locker rooms as return or supply air
plenums due to the potential of corrosion for components installed in the room. The return air duct should always
connect the pool enclosure to the return air connection of the PoolPak™ unit(s).
Other Air-side Considerations
A duct heater (hot water coil, electric, or gas) may be installed in the supply duct to provide auxiliary space heating.
Be sure that the additional air pressure drop across the heater is accounted for in the unit fan selection. These heating
components must be designed for use in swimming pool environments.
Maintain the poolroom at a slightly negative pressure. This will minimize moisture and chemical odor migration to other
spaces. The exhaust fan should be sized for about 5-10% greater CFM than the amount of outside air being introduced
into the space. Ducts can be fabric, aluminum, PVC, or galvanized steel. Even though “dry air” is being supplied back
to the pool, do not use duct board or similar materials. If the PoolPak™ unit is installed in an area that is below the
natatorium’s dew point temperature, the ducts may require insulation, pitching and drainage.
Continuous vapor barriers are required between the poolroom and all other interior and exterior spaces because of the
high dewpoint in the poolroom all the time. Care must be taken during design and installation to avoid gaps in the
vapor barriers or building damage may result. For more information, see the PoolPak™ Educational Library articles
“Eforescence, What Causes It and How Do You Remove It?” and “Vapor Barriers In Natatoriums”.
Windows and exterior doors must be selected with adequate thermal insulation (including thermal breaks) to minimize
condensation on their interior surfaces even if the supply air is directed across these components. Doors and windows
must also have as low an air leakage as possible. Although the space will be maintained at a slightly negative pressure,
cold air leaking into the space from poorly sealed openings will negate all of the effects of good thermal insulation.

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SECTION II: POOLPAK PRINCIPLES, FUNCTIONS,
AND FEATURES
PRINCIPLES OF OPERATION
The PoolPak™ System is a complete environmental control system designed expressly for indoor swimming pool
enclosures. It takes into account two important factors: the swimming pool occupant (personal comfort) and the
swimming pool environment (the physical structure and surrounding furnishings).
The swimming pool enclosure can be a hostile environment for equipment, decor and building structures. A PoolPak™
System’s major function is to dehumidify the pool enclosure air through a vapor compression cycle. During this cycle
the PoolPak™ System recycles the sensible and latent heat and places it back into the pool water and air as needed. This
recycling process saves money and keeps your pool environment efcient and safe.
Solid state microprocessor technology, working in conjunction with sensors, continually monitors water and air
conditions to provide superior occupant comfort. Unlike typical outside air ventilation systems, a PoolPak™ System
recycles energy and blankets the walls and windows with warm, dry air.
PoolPak™ dehumidication systems reduce the energy input required to maintain pool water and air temperatures. By
dehumidifying the air and recycling the latent energy back into the pool air and water, the unit will reduce operating
costs when compared to conventional heating and ventilating systems. Pool water and enclosure heating are still needed
but with greatly reduced requirements.
A PoolPak™ unit, when matched correctly to the evaporation rate of the pool water and overall dehumidication
requirements, will efciently maintain the pool air at relative humidity levels between 50% and 60%. It should be noted
that a lower evaporation rate occurs when the pool enclosure’s air temperature is maintained above the pool water
temperature. Evaporation losses, and the energy required to maintain desired room conditions, will dramatically increase
if the air temperature is allowed to fall below the pool water temperature. It is recommended that the continuous dry bulb
temperature entering the evaporator of the PoolPak™ unit not fall below 75°F.
PoolPak™ International recommends that backup heating equipment for both pool water and pool enclosure air is
capable of carrying the full system heating requirements. This makes for a well-designed system that will provide the
least amount of pool down time if unforeseen system problems occur. Building conductive loads and other losses must
be taken into consideration.
AUTOMATIC CONTROL OF AIR TEMPERATURE AND HUMIDITY
An integral part of any PoolPak™ System is a proven microprocessor control system which automatically senses and
maintains comfort conditions. Sensors detect changes in humidity and air temperature in the indoor pool environment
and quickly regulate supply air conditions to meet set point comfort levels, even during periods of unusually heavy pool
use.
To prevent condensation on walls and windows, the PoolPak™ System automatically adjusts humidity in response to
changes in wall or window surface temperatures. As the seasons and weather conditions change, the PoolPak™ System
changes its own mode of operation. Throughout the year, PoolPak™ thinks “efciency” and automatically selects the
least expensive energy source for the poolroom conditions.
PoolPak™ models include a factory mounted and wired space temperature and humidity sensor at the return air opening
of the unit. Refer to the installation section for mounting location. Caution should be exercised. When the outside air is to
be introduced into the space for ventilation, adequate exhaust capacity via an integral (or a separate external fan) must be
specied to ensure the poolroom remains slightly negative. An inadequately sized exhaust system may result in damage
to the structure and pool odors may be forced into other areas of the building.

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ROOM DEW POINT CONTROL
PoolPak™ units with the ECC controller operate using an advanced type of control utilizing dew point and dry bulb
temperature control. This method of control is more accurate than conventional relative humidity control. The main
purpose of a dehumidication system is to maintain the amount of moisture in the pool area below a level that would
cause damage to the building. Relative humidity is a measurement of the percentage of moisture which is in the air at a
given dry bulb temperature in proportion to the maximum amount of moisture that could be contained at this particular
dry bulb temperature. Warmer air can hold more moisture than colder air, therefore, changes in dry bulb temperature
will change the relative humidity reading without any change in the actual amount of moisture in the air. The amount
of moisture in the air is expressed as “grains of moisture per pound of dry air” and is directly related to the dew point
temperature.
The ECC uses dew point control to operate the PoolPak™ unit and maintain the moisture level below the setpoint (see
Figure 2-1). The space dry bulb temperature and relative humidity determine the dew point temperature. By varying the
space temperature and space relative humidity set points, the dew point set point is changed. When the space dew point
temperature rises more than 1/2 degree Fahrenheit above the space dew point temperature set point, the ECC controller
energizes the compressor for dehumidication. As the dew point temperature drops more than 1/2 degree Fahrenheit
below the dew point temperature set point, the controller de-energizes the compressor.
Figure 2-1. Dew Point Control Psychrometric
0.000
30˚F/-1˚C
Dry Bulb Temp.
40˚F/4˚C 50˚F/10˚C 60˚F/16˚C 70˚F/21˚C 80˚F/27˚C 90˚F/32˚C 100˚F/38˚C 110˚F/43˚C 120˚F/49˚C
0.030
0.028
0.024
0.020
0.016
0.012
0.008
0.004
Humidity Ratio
lb
w
/ lb
a
Dew Point
82˚F / 28˚C
80˚F / 27˚C
75˚F / 24˚C
70˚F / 21˚C
65˚F / 18˚C
60˚F / 16˚C
55˚F / 13˚C
50˚F / 10˚C
45˚F / 7˚C
40˚F / 4˚C
35˚F / 2˚C
30˚F / -1˚C
80%
60%
40%
20%
If RA here, space too
cold, too humid
If RA here, space too
hot, too humid
If RA here, space too
cold, humidity OK
If RA here, space too
hot, humidity OK
ALL_DewpointControlPsychro_20131220.eps

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POOLPAK™ OPERATION
The PoolPak™ fan draws in warm, moist air from the pool enclosure. This air passes through the evaporator
(dehumidication) coil and gives up heat energy to the refrigerant which is in a cool, liquid state. This exchange of
energy causes the air temperature to fall below its dew point, resulting in moisture condensation on the evaporator coil.
The moisture formed falls into the unit’s condensate drain pan. After passing through the evaporator coil, the refrigerant
becomes a cool gas.
The refrigerant enters the unit’s compressor, where it is compressed into a hot gas. While in the compressor, the
refrigerant absorbs the energy used to operate the compressor. This hot gas refrigerant then travels either through an air
reheat coil, the pool water condenser or to an optional auxiliary air conditioning condenser, which may be either air or
water cooled. If air heating is called for, the air reheat coil is used. The hot refrigerant exchanges energy with the cooler,
dehumidied air coming from the evaporator coil. This causes the temperature of the air to rise for heating.
If pool water heating is required the hot gas ows into a pool water condenser, where it adds energy to the incoming pool
water. This heats the pool water while the refrigerant is condensed into a warm liquid. If space cooling is called for, the
refrigerant ows to the auxiliary air conditioning condenser bypassing the air reheat coil and pool water condenser and
allowing cool air from the evaporator coil to provide space cooling.
The SR series includes a return fan that allows for economizer operation and up to 100% outside air as shown in the SR
typical schematic, Figure 2-2.
The S series can include a factory mounted exhaust fan (SE), an exhaust and purge fan (SEP) or just an outside air
damper (S). A typical SEP series unit is shown in Figure 2-3. This series does not have a return fan so that the outside
air is limited to about 30% under normal operation.
Standard Items Factory Mounted
• Evaporator (dehumidication) coil
• Air reheat coil (hot gas reheat coil)
• Bottom, top (for indoor installations) or horizontal supply air conguration
• Filters and lter rack
• Air temperature and relative humidity sensor
• Compressor suction and discharge pressure transducers
• Compressor suction temperature
Standard Items Factory Supplied for Field Installation
• Remote Interface Unit (RIU)
• Cold surface temperature sensor
• Outside air temperature and humidity sensor
• Pool Water Temperature Sensor
System Options
• Remote air-cooled condenser for space air conditioning
• Flywheel air conditioning (SR and SEP)
• Water-cooled condenser
• Capability of introducing outside air
• Economizer control (SR and SEP)
• Network multiple units
• Remote monitoring via Internet
• Weatherproong for outdoor installation

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Figure 2-2. SWHP SR System Schematic
Figure 2-3. SWHP SEP System Schematic
WARM
RETURN
AIR
FROM
POOL
SUPPLY
AIR TO
POOL
T
H
TH
COMPRESSOR
DAMPER
EVAPORATOR
COIL (HEAT
RECOVERY
COIL)
EXPANSION
VALVE
POOL WATER
CONDENSER
HOT LIQUID REFRIGERANT
HOT GAS REFRIGERANT
COLD LIQUID REFRIGERANT
COLD GAS REFRIGERANT
TEMPERATURE SENSOR
RELATIVE HUMIDITY SENSOR
SUPPLY
FAN
OUTSIDE
AIR
S
S
S
SOLENOID
VALVES
TO AIR-COOLED
CONDENSER OR
WATER-COOLED
CONDENSER
(OPTIONAL)
COOL POOL WATER
FROM AIR-COOLED
CONDENSER OR WATER-
COOLED CONDENSER
(OPTIONAL)
WARM POOL WATER
AUXILIARY POOL
WATER HEATER
(SUPPLIED BY OTHERS)
CONDENSER/
REHEAT COIL
AUXILIARY HEATING COIL
(OPTIONAL HOT WATER,
NATURAL GAS INDIRECT-FIRED
FURNACE, STEAM OR ELECTRIC)
T
H
RECEIVER
NOTE: ALL ITEMS WITHIN
DASHED LINE AREA ARE
CONTROLLED BY POOLPAK
MICROPROCESSOR CONTROLLER
NATATORIUM
COLD SURFACE
TEMPERATURE
SENSOR
T
EXHAUST
FAN
EXHAUST TO OUTSIDE
PURGE
FAN
PURGE TO OUTSIDE
GLYCOL PUMP
HEAT RECOVERY
OPTION

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ECC CONTROL SYSTEM
OVERVIEW
The PoolPak™ is controlled by the Electronic Control Center (ECC III), a microprocessor-based system that
incorporates all of the functions necessary to maintain correct natatorium space temperature and humidity and control
pool water temperature. The ECC is designed to work with the PoolPak™ dehumidication system to provide an
environment that is both comfortable and cost effective. It controls unwanted humidity in the pool enclosure and helps to
prevent unsightly condensation from forming on surfaces.
System parameters and/or system status readouts are provided on the remote-mounted display/keypad panel, Remote
Interface Unit (RIU). Set points may be changed easily and may be password protected. Set points are saved in the
memory of the ECC and are not erased in the event of a power failure. Critical operating data can be easily accessed by a
qualied service technician for the purpose of system operation and evaluation.
The ECC III controller has a fault code history log that records the last 50 faults in the order of their occurrence. Each
fault code is recorded along with the date and time and the values of the critical system parameters. This fault code
history log is accessible at the control panel via the ECC III controller and at the remote display/keypad panel (Remote
Interface Unit, RIU). The fault code history log is also accessible with the optional Remote Access Package (RAP). This
Remote Access Package is available only with a BACnet/IP based Building Automation System (BAS).
The PoolPak™ ECC III also has the option to be directly connected to several different BAS options. The ECC III can be
connected to either a LonWorks based BAS or a Modbus RTU based BAS, BACnet/IP and BACnet MS/TP.
All PoolPak™ operating and logic controls are factory mounted and wired. The control sequences are designed
specically to control swimming pool environmental conditions.
As a minimum, the PoolPak™ control system provides full modulation of the heat recovery/heating system by
proportional control of dry bulb temperature, relative humidity, interior building-skin-temperature-based humidity reset,
and outside air volume.
The PoolPak™ controls automatically operate the heating, dehumidication, and heat recovery system in response
to the greatest requirements while adjusting unit outputs to maintain building conditions. The PoolPak™ controls are
capable of providing full heating capacity to either air or water and of providing proportional control of heating and
dehumidication by loading stages of compressor capacity as necessary. As building requirements are satised, the
compressor unloads.
The PoolPak™ System provides outside air ventilation to satisfy minimum air ventilation requirements per ASHRAE
62.1 ventilation standard.
HUMIDITY CONTROL
When equipped, the economizer is activated if dehumidication is required, air temperature is satised, the absolute
humidity of the outside air is lower than the absolute humidity of the pool room air and the outside air temperature will
not adversely affect the pool room air temperature.
The PoolPak™ provides full proportional control of relative humidity by staging unit capacity. The humidity controller
energizes the compressor. The moist air from the pool room is drawn over the evaporator coil, where the air is cooled
below its dew point. In this cooling process, the moisture in the return air is condensed onto the evaporator coil. The heat
recovered in the refrigerant from the dehumidication process is directed to the air reheat condenser if the space needs
heating or to the pool water condenser if pool water temperature is below the set point.

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COLD SURFACE TEMPERATURE HUMIDITY RESET
The ECC control system includes a sensor that measures the temperature of the coldest surface in the pool enclosure,
usually an exterior window or door frame. When the temperature of this surface approaches the dewpoint temperature
of the space, the controller lowers the humidity setpoint to activate dehumidication. This function helps to prevent
condensation on the cold surface. Typical locations for this condensate prevention surface temperature sensor are north
facing exterior walls, windows, window/door frames and skylights.
SPACE HEATING
Space heating via heat recovery uses full proportional control of the space dry bulb temperature by staging compressor
loading of unit capacity with humidity override. Heat is recovered automatically from the pool room return air. The
PoolPak™ automatically controls the output of the optional factory-installed auxiliary air-heating coil which can be hot
water, steam, electric or gas.
NETWORKING MULTIPLE UNITS
ECC networking allows multiple units to be connected together. The units will work with each other to control water
temperature, air temperature and relative humidity. Networked units have all the features of standard units plus the ability
to control water temperature in multiple pools. All units on the network are accessible from a single remote interface
unit for convenience.
SMART ECONOMIZER (SR)
The Smart Economizer utilizes the simultaneous operation of the heat recovery and economizer control sequence.
When the PoolPak™ compressor is operating in the heating and/or dehumidifying heat recovery mode, return air passes
through the evaporator. The sensible and latent heat in the return air is transferred to the refrigerant. Air leaving the
evaporator is cold and saturated. The exact temperature and dew point of the air leaving the evaporator is monitored
and compared to outside air temperature and dew point. If the outside air is warmer and/or dryer than the air leaving
the evaporator, all the air leaving the evaporator is exhausted and 100% outside air is drawn into the PoolPak™. All the
heat recovered in the PoolPak™ unit refrigerant is transferred to the supply air in the air reheat condenser. The Smart
Economizer saves more energy than a standard mixing box and economizer.
SPACE COOLING (OPTIONAL)
If space cooling is required and the unit is equipped with an auxiliary refrigerant condenser (air-cooled or water-cooled),
the ECC will activate the space cooling mode of operation. In this mode, the heat removed from the space air will be
directed to the auxiliary condenser. The air cooling mode of operation is independent of the need for dehumidication.
The PoolPak™ SR and SEP units are equipped with economizer sections. The ECC will automatically select the most
economical method for space cooling. An economizer utilizes outside air rather than the refrigeration system to achieve
space cooling. A sensor connected to the ECC monitors the outside air temperature. When appropriate, the controller will
disable the compressor and bring in cool outside air for economical operation.
Air Conditioning with Air-Cooled Condenser
The PoolPak™ can be equipped with a properly sized remote air-cooled condenser. This remote condenser can be
“piggyback-mounted” on the PoolPak during installation or installed on a separate pad.

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Air Conditioning with Water-Cooled Condenser
The PoolPak™ unit can be equipped with a factory-mounted or remote-mounted air conditioning water condenser. This
condenser can be either cleanable or non-cleanable. Sensible and latent heat recovered in the air conditioning mode is
rejected to the water condenser if pool water temperature requirements are satised.
Air Conditioning with Chilled Water Coil
When chilled water is available, a chilled water coil can be factory-installed upstream of the supply fan. The coil has a
factory-installed and wired two-way ow control valve and is controlled by the PoolPak™ control system.
POOL WATER HEATING
If the space temperature is at or above the set point and the pool water temperature is below the set point, hot gas
is directed to the pool water condenser when the compressor is running. During times when the pool water requires
more heat than is available from the pool water condenser, the PoolPak™ activates the auxiliary pool water heater. An
auxiliary pool water heater must be supplied as part of the pool water pump and lter system.
NOTE
Contact factory for pool water temperature set points greater than 87° F
SMART PUMP CONTROL
Smart Pump control allows the ECC to control operation of the PoolPak™ water loop pump. When the ECC determines
that pool heating and space cooling are required, a contact closure signal activates the remote pump. The pump will be
deactivated when the pool heating or space cooling requirement is satised.
OCCUPIED/UNOCCUPIED CONTROL MODE
The PoolPak™ unit time clock allows 7-day, 24-hour scheduling of operational control for both occupied and
unoccupied times during the year. During unoccupied times, the outside air and exhaust dampers are kept in the closed
position to minimize the air-heating load. During occupied times, the PoolPak™ operates to maintain programmed
natatorium parameters.
PURGE MODE (SR AND SEP)
The PoolPak™ has a purge cycle to fully ventilate the natatorium at the airow (CFM) specied for the unit’s supply
fan. The purge cycle is programmable by the owner as necessary to ventilate the natatorium after shocking the pool. Unit
controls provide completely automatic operation by controlling the supply fan and return (or purge) fan and by opening
the outside air and exhaust air dampers for the programmed time intervals.
CO2 BASED DEMAND VENTILATION
The amount of outside air ventilation provided is controlled by the PoolPak™ unit based on the CO2level sensors in the
return air stream.
EVENT MODE (SR)
The Event Mode changes the ventilation air quantity to meet the demands of an event or situation where additional
outside air is needed. The unit controller can store up to 28 schedule events, which is user adjustable at the Remote
User Interface (RUI). During Event Mode, the minimum damper position is raised to a value higher than the minimum
damper setpoint. For each event, the screen shows the day of the week, the hour in 24-hour format, the minute, and the
event type.