AE-Air WSS6 Series Instruction manual

Installation, Operation, & Maintenance Manual
IOM 8302
Rev. A 04/21
WSS6 Series
“Slim” Vertical Water Source Heat Pump
16 EER

WSS6 Series - IOM
WSS6 SERIES – IOM (REV. A 4/21) 2
COPYRIGHT
AE Air works to continually improve its products and as a result, it reserves the right to change design and specifications
without notice.
The warranty may be void unless the Startup & Performance Checklist is completed and returned to the warrantor. If the WSS6
unit is not installed properly the warranty will be void as the manufacturer can’t be held accountable for problems that stem
from improper installation.
©2021 AE Air, 8273 Moberly Lane, Dallas, TX 75227
***WARNING TO INSTALLER, SERVICE PERSONNEL AND OWNER***
Altering the product or replacing parts with non-authorized factory parts voids all warranty or implied warranty
and may result in adverse operational performance and/or a possible hazardous safety condition to service
personnel and occupants. Company employees and/or contractors are not authorized to waive this warning.

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TABLE OF CONTENTS
SAFETY CONSIDERATIONS 4
MODEL NOMENCLATURE 5
GENERAL INFORMATION 6
INTRODUCTION 6
STORAGE 6
UNIT DIMENSIONAL DATA 7-8
UNIT PHYSICAL DATA 8
ELECTRICAL DATA 9
UNIT INSPECTION CHECKLIST 9
INSTALLATION PRECAUTIONS 10
MOUNTING DETAILS 11-12
PIPING 13
CONDENSATE 13-14
DUCTWORK 14
ELECTRICAL 15
APPLICATION 16-17
CONTROLS 18-22
CONTROL BOX DETAIL 23
BLOWER SPEED CONTROL 23
REFRIGERATION SLIDE OUT DETAIL 24-25
PRE-STARTUP CHECKS 26
STARTUP INSTRUCTIONS 26
STARTUP & PERFORMANCE CHECKLIST INSTRUCTIONS 26
PERFORMANCE TABLES 27
WIRING DIAGRAMS 28-31
CIRCUIT SCHEMATIC 32
TROUBLESHOOTING 33-34
SUPPLEMENTAL DATA / TABLES 35-37
SUPPORT MATERIAL 38
PREVENTATIVE MAINTENANCE 39
STARTUP & PERFORMANCE CHECKLIST 40
INDEX OF FIGURES 41
INDEX OF TABLES 42

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SAFETY CONSIDERATIONS
1. READ THE ENTIRE MANUAL BEFORE STARTING THE INSTALLATION.
2. These instructions are intended as a general guide and do not supersede national, state, or local codes in any way.
3. Altering the product, improper installation, or the use of unauthorized factory parts voids all warranty or implied warranty
and may result in adverse operation and/or performance or may result in hazardous conditions to service personnel and
occupants. Company employees or contractors are not authorized to waive this warning.
4. This product should only be installed and serviced by a qualified, licensed, and factory authorized installer or service agency.
5. All “kits” and “accessories” used must be factory authorized when modifying this product. Refer and follow instructions
packaged with the kits or accessories when installing.
RECOGNIZE THE FOLLOWING SAFETY NOTATIONS THROUGHOUT THIS MANUAL
AND POSTED ON THE EQUIPMENT:
WARNING
Indicates a potentially hazardous situation or unsafe practices
that could result in severe personal injury or death and/or
damage to property.
WARNING
ELECTRIC SHOCK HAZARD
This warning signifies potential electrical shock hazards that
could result in personal injury or death.
CAUTION
The CAUTION symbol indicates a potentially hazardous
situation that may result in minor or moderate injury.
NOTE
Used to highlight suggestions, which may result in enhanced
installation, reliability or operation.

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MODEL NOMENCLATURE
FIGURE 1 - WSS6 Model Nomenclature
MODEL NUMBER DESCRIPTION – WSS6 SERIES
Digits 1-4 – MODEL
WSS6 – 16 EER Slim WSHP
Digits 5-7 – CAPACITY
006 - 6,000 Btuh
009 - 9,000 Btuh
012 - 12,000 Btuh
015 - 15,000 Btuh
018 - 18,000 Btuh
024 - 24,000 Btuh
030 - 30,000 Btuh
Digit 8 – REVISION LEVEL
A –
Digit 9 – VOLTAGE / MOTOR DRIVE
6 – 208-230/1/60
7 – 265/1/60
Digit 10 – RETURN AIR LOCATION
L – Left Hand
R – Right Hand
Digit 11 – Heat Exchanger
C – Copper
N – Cupronickel
Digit 12 – WATER CONNECTION OPTIONS
F – Front
Digit 13 – AIR SUPPLY LOCATION
T – Top (Vertical)
Digit 14 – FILTER FRAME
1 – 1” Frame
2 – 2” Frame
Digit 15 – FILTER OPTIONS
0 – 1” TA Std
A – 2” MERV 8
B – 2” MERV 11
Digit 16 – CONTROLS
A – Std
Digit 17 – REFRIGERANT / DEHUM OPTIONS
0 – NONE
Digit 18 – CABINET / SOUND OPTIONS
0 – Std Insulation
Digits 19-21 – SPECIAL OPTIONS
000 – No Options
Digits 22 – BRAND

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GENERAL INFORMATION
CAUTION
DO NOT use these units as a source of heating or
cooling during the construction process. Mechanical
components and filters can become clogged with dirt
and debris, which can cause damage to the system.
The manufacture does not warrant equipment
subjected to abuse. Construction debris can void
warranties and liability for equipment failure, personal
injury, and property damage.
WARNING
ELECTRIC SHOCK HAZARD
Before servicing equipment, ALWAYS turn off all power
to the unit. There may be more than one disconnect
switch. Electrical shock can cause injury or death.
Clear surrounding area of all tools, equipment, and
debris before operating this unit.
Unit must never be operated under any circumstances
without an air filter in place.
These instructions are given for the installation of the
WSS6 Water source heat pump specifically. For any
other related equipment, refer to the appropriate
manufacturer’s instructions.
NOTE
Material in this shipment has been inspected at the
factory and released to the transportation agency in
good condition. When received, a visual inspection of all
cartons should be made immediately. Any evidence of
rough handling or apparent damage should be noted on
the delivery receipt in the presence of the carrier’s
representative. If damage is found, a claim should be
immediately filed against the carrier.
These models are designed for indoor installation only.
Installation of this equipment, wiring, ducts, and any
related components must conform to current agency
codes, state laws, and local codes. Such regulations take
precedence over general instructions contained in this
manual.
CAUTION
Extreme caution must be taken that no internal damage
will result from screws that are drilled into the cabinet.
INTRODUCTION
The Hydrotech WSS6 model water to air heat pumps
provide the best combination of performance, efficiency
and reliability in a compact form factor. The heat pump
comes standard with ECM blowers for high efficiency
and comfort and features a removable condensing
section design to allow for easy servicing of the unit.
All WSS6 models are certified to AHRI ISO Standard
13256-1. The WSS6 models are designed to operate with
fluid temperatures between 50°F to 110°F in cooling
mode and 50°F to 90°F in heating mode for continuous
operation.
STORAGE
Equipment should be stored in a clean dry, conditioned
area with maximum temperatures up to 120°F and
minimum temperatures to 32°F. Units should be stored
upright and in an indoor environment. It is
recommended to leave packaging on the unit until the
installation is to begin.
CAUTION
Stacking of the WSS6 systems is strictly prohibitive.
Failure to do so may result in system and/or property
damage.
DO NOT use these units as a source of heating or cooling
during the construction process. Mechanical
components and filters could become clogged with dirt
and debris, which can cause damage to the system.
The manufacture does not warrant equipment subjected
to abuse. Construction debris can void warranties and
liability for equipment failure, personal injury, and
property damage.

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UNIT DIMENSIONAL DATA
FIGURE 2 - Dimensional Drawing
FIGURE 3 - Right Top View
FIGURE 4 - Left Top View
FIGURE 5 - Front View
FIGURE 6 - Return View

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UNIT DIMENSIONAL DATA CONTINUED
UNIT DIMENSIONAL DATA
Model A B C D E F G H I J K L
Overall Cabinet Supply Connections Water Connections
WSS6006 16.1 16.1 40 3.3 10.6 1.5 8.5 7.0 0.6 9.8 7.3 4.8
WSS6009 16.1 16.1 40 3.3 10.6 1.5 8.5 7.0 0.6 9.8 7.3 4.8
WSS6012 16.1 16.1 40 3.3 10.6 1.5 8.5 7.0 0.6 9.8 7.3 4.8
WSS6015 16.1 16.1 40 3.3 10.6 1.5 8.5 7.0 0.6 9.8 7.3 4.8
WSS6018 18.1 18.1 40 5.9 13.0 1.5 4.4 10.6 0.6 9.8 7.3 4.8
WSS6024 18.1 18.1 40 5.9 13.0 1.5 4.4 10.6 0.6 9.8 7.3 4.8
WSS6030 18.1 18.1 40 5.9 13.0 1.5 4.4 10.6 0.6 9.8 7.3 4.8
Table 1 – Unit Dimensional Data
UNIT DIMENSIONAL DATA CONTINUED
Model M N O P Q T V
Electrical Connections Return Connections
WSS6006 15.0 9.3 6.8 1.0 15.0 20.0 19.5
WSS6009 15.0 9.3 6.8 1.0 15.0 20.0 19.5
WSS6012 15.0 9.3 6.8 1.0 15.0 20.0 19.5
WSS6015 15.0 9.3 6.8 1.0 15.0 20.0 19.5
WSS6018 15.0 9.3 6.8 1.0 17.0 20.0 19.5
WSS6024 15.0 9.3 6.8 1.0 17.0 20.0 19.5
WSS6030 15.0 9.3 6.8 1.0 17.0 20.0 19.5
Table 2 – Unit Dimensional Data Continued
UNIT PHYSICAL DATA
UNIT PHYSICAL DATA
WSS6 006 009 012 015 018 024 030
Compressor (Quantity) Rotary (1) Rotary (1) Rotary (1) Rotary (1) Scroll (1) Scroll (1) Scroll (1)
Factory Charge (R410A) lbs [oz] 1.95 [31.2] 1.95 [31.2] 2.03 [32.5] 2.03 [32.5] 3.25 [51.2] 3.25 [51.2] 3.3 [56]
Fan Motor
Motor (Quantity) 1 1 1 1 1 1 1
Fan Motor Type ECM ECM ECM ECM ECM ECM ECM
Motor HP Standard / High Static 1/4 1/4 1/4 1/4 1/2 1/2 1/2
Blower
Blowers (Quantity) 1 1 1 1 1 1 1
Blower Wheel Size (D x W) 9x7 9x7 9x7 9x7 10x7 10x7 10x7
Water Connect
Size FPT (in) 3/4 3/4 3/4 3/4 3/4 3/4 3/4
Condensate Connection
Size FPT (in) 3/4 3/4 3/4 3/4 3/4 3/4 3/4
Air Coil
Dimensions (H x W) 20 x 12 20 x 12 20 x 12 20 x 12 20 x 14 20 x 14 20 x 14
Face Area (ft²) 1.7 1.7 1.7 1.7 1.9 1.9 1.9
Miscellaneous
Throwaway Filter (Dimensions) 20x16 20x16 20x16 20x16 20x18 20x18 20x18
Throwaway Filter (Quantity) 1 1 1 1 1 1 1
Weight – Operating (lbs) 153 155 157 159 211 213 215
Weight – Packaged (lbs) 158 160 162 164 216 218 220
Notes:
FPT = Female Pipe Thread
Table 3 – Unit Physical Data

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ELECTRICAL DATA
ELECTRICAL DATA
MODEL
NUMBER VOLTAGE-PH-HZ COMPRESSOR BLOWER MIN.
CIRCUIT
AMPACITY
MAX. CIRCUIT
PROTECTION
MIN.
VOLTAGE
MAX.
VOLTAGE
RLA LRA FLA HP
WSS6006 208/230V-1-60 3 15 2.3 1/4 7 15 187 253
265V-1-60 2.7 11 2.3 1/4 6 15 238 292
WSS6009 208/230V-1-60 4.4 22 2.3 1/4 8 15 187 253
265V-1-60 3.5 22 2.3 1/4 7 15 238 292
WSS6012 208/230V-1-60 4.7 26 2.3 1/4 9 15 187 253
265V-1-60 3.8 23 2.3 1/4 8 15 238 292
WSS6015 208/230V-1-60 6.3 32 2.3 1/4 11 15 187 253
265V-1-60 5.6 27 2.3 1/4 10 15 238 292
WSS6018 208/230V-1-60 9 47.5 4.1 1/2 16 20 187 253
265V-1-60 7.1 43 4.1 1/2 13 15 238 292
WSS6024 208/230V-1-60 10.9 62.9 4.1 1/2 18 20 187 253
265V-1-60 9 54 4.1 1/2 16 20 238 292
WSS6030 208/230V-1-60 12.8 72.2 4.1 1/2 21 25 187 253
265V-1-60 11.2 60 4.1 1/2 19 20 238 292
Table 4 - Electrical Data
UNIT INSPECTION CHECKLIST
Before preparing unit for installation, completing the
inspection procedures below.
1) Visually inspect unit for any shipping damage.
Damage must be reported immediately to the
shipping company to make a claim.
2) Ensure that the carrier make proper notation of
any shortages or damage on all copies of the
freight bill and completes a common carrier
inspection report.
3) Verify that unit nameplates on the data label
match the sales order or bill of lading (including,
unit configuration, size and voltage).
4) Immediately before installation, remove unit front
panel and verify that all electrical connections are
tight and that there are no loose wires.
5) Check to make sure that the refrigerant piping is
free from any kinks and there is no interference
between unit piping and sheet metal or electrical
wires.
6) Remove the blower access panel and remove the
Styrofoam packaging mount underneath the
blower.
7) Check that the blower spins freely within the
housing and there are no obstructions between
the wheel and housing. The wheel can sometimes
come loose in shipping.
8) Ensure that evaporator distributor tubes are not
touching one in another and that they are over the
drain pan.
9) Check the condensate sensor on the drain pan to
make sure that it is rigid and attached.
10) Check the air-coil fins for any damage during
shipping.
11) Ensure that shipping screws are removed from
condensing section. Refer to
FIGURE 7 - Removal of
Shipping Screws
for more information.
FIGURE 7 - Removal of Shipping Screws
NOTE
Check the unit nameplate for correct voltage with the
plans before installing the equipment. Also make sure
all electrical ground, connections are made in
accordance with local code.

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INSTALLATION PRECAUTIONS
WARNING
Use multiple people when moving and installing these
units. Failure to do so could result in injury or death.
CAUTION
Contact with metal edges and corners can result injury.
Protective gloves should be worn when handling.
Exercise caution when installing and servicing unit.
Observe the following precautions for typical
installation:
 Always use proper tools and equipment
 No wiring or any work should be attempted without
first ensuring the unit is completely disconnected from
the power source and locked out. Also, verify that a
proper permanent and uninterrupted, ground
connection exists prior to energizing power to the
unit.
 Review unit nameplate and wiring diagram for proper
voltage and control configurations. This information
may vary from unit to unit.
CAUTION
When the unit is in operation components are rotating
at high speeds and caution should be taken.
WARNING
When soldering and brazing, it is recommended to have
a fire extinguisher readily available. When soldering and
brazing close to valves or sensitive components, heat
shields or wet rags are required to prevent damage to
the valves or components.
NOTE
Insulation is installed in the unit to provide a barrier
between varying atmospheres outside and within the
unit. If insulation is damaged condensation can occur
and can lead to corrosion, component failure, and
possible property damage. Damaged insulation must be
repaired prior to the operation of the unit. Insulation
will lose its effectiveness and value when wet, torn,
separated, and/or damaged.
CAUTION
Always wear all appropriate personal protection
Equipment when installing and servicing these units.
CAUTION
When servicing this equipment, because of high
pressures, make sure the reversing valve, expansion
device, filter drier and other components are
specifically designed for R-410A refrigerant.
ONLY USE service equipment specifically designated for
use with R-410A.
WARNING
R-410A can become combustible if mixed with air at
elevated temperature and/or pressure. Failure to follow
this warning could result in property damage and
personal injury or death.

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MOUNTING DETAILS
NOTE
It is important to ensure the unit is securely mounted and that the mounting structure is sufficient to support the
operating weight of the equipment. Place and size all anchors to ensure a safe and durable installation.
Locate the unit in an area that provides minimum clearance to all service access panels.
FIGURE 2 - Dimensional Drawing
and
Table 1 – Unit Dimensional Data
&
Table 2 – Unit Dimensional Data Continued
for detailed information on unit dimensional
sizes. Consider all additional clearances needed for water connections, electrical connections, duct connections and
sufficient return airflow.
These units are for indoor installation ONLY!
Do not locate unit in areas subject to freezing temperatures or where high humidity levels could cause cabinet
condensation. WSS6 units are available in right and left hand configurations. Units should be mounted level with a proper
drain pan pitch toward the condensate drain as seen below in
FIGURE 8 - Mounting Illustration
. 3/8”-1/2” vibration isolation
pads must be used to minimize vibration transmission.
FIGURE 8 - Mounting Illustration

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MOUNTING DETAILS CONTINUED
MOUNTING EXAMPLES
FIGURE 9 - Mount on High Platform
FIGURE 10 - Hanging from Ceiling
Units should be mounted level on a solid platform no less
than ¾” plywood or other related material with a proper
drain pan pitch toward the condensate drain.

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PIPING
CAUTION
Prior to making piping connections, contractor must
clean and flush water loop system. Failure to clean/flush
system may result in nuisance tripping and premature
component failure.
PIPING NOTES
1. Flush all field piping prior to connection to clear all
debris.
2. Open all valves (mid-way for hand valves, manually
open motorized valves) prior to soldering and brazing.
Use proper heat shields to protect valve bodies.
3. When soldering or brazing to the unit, it is
recommended to have a fire extinguisher readily
available.
4. Use proper soldering and brazing techniques to
protect valve bodies and unit components.
5. Avoid rapid quenching of soldered joints to prevent
weakening.
6. Make provisions for expansion and contraction of
piping systems to provide movement with
temperature changes. Failure to do so will result in
damage and failure of piping, fittings, and valves
throughout the system.
7. DO NOT insulate the heads or motorized portion of
control valves. Excessive heat build-up can cause
damage and affect proper operation of the system.
8. Consider electrical routing when installing field piping.
9. Observe all regulations and codes governing
installation of piping.
10. When all connections are complete, pressure test the
system, and repair any leaks or faulty joints. Hydronic
systems are not designed to hold pressurized air and
should only be tested with water. Failure to observe
this note could damage the system.
PIPING INSTALLATION:
All piping must be adequately sized to meet the
designed water flow as specified for the specific
application, and must adhere to all applicable codes.
Piping connections on the equipment are not necessarily
indicative of the proper supply and return line sizes.
Refer to the project drawings and specifications for
sizing.
On units with plastic drain pans the drain connection
must be made hand tight only.
Chilled water piping must be properly insulated to
prevent condensation and potential property damage. It
is also recommended that all piping be insulated to
prevent freezing in unconditioned spaces.
CAUTION
Do not bend or kink supply lines or hoses. For all supply
lines or hoses of 1-1/2” OD or greater, use proper sized
fitting is recommended to prevent piping damage and
potential restrictions in water flow.
NOTE
For all applications, 50°F minimum entering water
temperature and rated water flow is required to
prevent freezing. Antifreeze solution is required for any
application with entering water below 50°F. Frozen
water coils are not covered under warranty.
These units are designed to operate with the entering
liquid temperature between 50°F and 100°F. Below 50°F.
Antifreeze solution must be used to prevent freezing.
Frozen water coils are not covered under warranty.
CONDENSATE
Condensate drain lines must be properly installed with
adequate slope away from unit to ensure proper
drainage. A minimum trap of 1.5 inches must be
installed to isolate the negative pressures of the drain
pan from the drain line. Refer to
FIGURE 11 - Condensate
Drain Layout
for schematic information on the
condensate drain lines.
CAUTION
Check the condensate overflow sensor for proper
operation and adjust if necessary. Final field
adjustments ensures proper operation to avoid
property damage.
CAUTION
On units with plastic drain pans, the drain connection
must be made hand tight only.

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CONDENSATE CONTINUED
FIGURE 11 - Condensate Drain Layout
DUCTWORK
Discharge ductwork is normally used with these units.
When return air ductwork is required, the unit is
supplied with 1” filter rack/duct collar for connection of
return air ductwork.
All duct work must be installed in accordance with
National Fire Protection Assoc. Codes 90A and 90B.
Supply and Return ducts must be sized properly as to not
exceed static pressure capabilities Ducts should be
adequately insulated to prevent condensation and to
minimize heat loss. A flexible connector is recommended
for supply air connections on metal duct systems.
DISCHARGE DUCTING
All ductwork must conform to industry standards of
good practice as described in ASHRAE System Guide.
A field supplied discharge duct system will normally
consist of flexible connector at the unit, a non-insulated
transition piece to the full duct size, a short run of duct,
an elbow without vanes and a trunk duct teeing into a
branch circuit with discharge diffusers as shown in
FIGURE 12 – Unit Ducting
.
The transition piece must not have an angle greater than
30° or severe loss of air performance can result. Do not
connect the full duct size to the unit discharge collar
without using a transition piece down to the size of the
unit discharge collar. With metal material, the sides of
the elbow and entire branch duct should be internally
lined with acoustic insulation for sound attenuation.
Glass Fiber duct board material is more absorbing and
may permit omission of the flexible connector.
The ductwork should be laid out so that there is no line
of sight between the unit discharge and the distribution
diffusers.
RETURN AIR DUCTING
Return air duct can be brought in through a wall grille
and then to the unit. The return duct system will
normally consist of flexible connector at the unit and a
trunk duct to the return air grille. With metal duct
material, the return air duct should be internally lined
with acoustic insulation for sound attenuation. Glass
Fiber duct board material is more absorbing and may
permit omission of the flexible connector.
A 1” air duct collar flange is included on the filter rack for
ducted return air application. A flexible duct collar can
then be attached between a duct transition and the
return air ductwork. The return air duct transition must
be the same size as the return air coil face area. See
FIGURE 12 – Unit Ducting
. Be sure to allow for proper
clearance to allow for filter change outs.
FIGURE 12 – Unit Ducting
NOTE
Follow the filter rack kit instructions &
recommendations for installation.

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ELECTRICAL
HIGH VOLTAGE
WARNING
ELECTRIC SHOCK HAZARD
Disconnect all power supplies before servicing. Lock
out/tag out to prevent accidental electrical shock.
NOTE: There may be multiple power sources supplying
the unit.
WARNING
Use copper conductors only. Install all parts and panels
before operation of unit. Failure to follow these
warnings can result in injury or death.
All wiring must comply with local and national code
requirements. Units are provided with wiring diagrams
and nameplate data to provide information required for
necessary field wiring.
These units are provided with a class 2 transformer for
24VAC control circuits. Should any add-on accessory or
component also have a class 2 transformer furnished,
care must be taken to prevent interconnecting outputs
of the two transformers by using a thermostat with
isolating contacts.
WARNING
Connect ground wire to ground terminal marked
“GND”. Failure to do so can result in injury or death.
CAUTION
Any device that has been furnished by the factory for
field installation must be wired in strict accordance with
the associated wiring diagram. Failure to do so could
damage components and void warranties.
208 VOLT OPERATION
All 208-240 Volt units are factory wired for 240 Volt
operation. For 208 Volt operation,
moving/changing/rewiring the line voltage tap on the 24
Volt control transformer is required. See note 3 on the
wiring diagram for instruction.
LOW VOLTAGE
THERMOSTAT
A standard 24 VAC Heat Pump thermostat is required
that will operate the reversing valve in the fooling mode.
Thermostat connections and their functions are below in
FIGURE 13 - Thermostat Connections
as follows:
C – Transformer 24VAC Common
O – Reversing Valve (energized in cooling)
Y – Compressor Contactor
R – Transformer 24VAC Hot
G – Evaporator Blower
FIGURE 13 - Thermostat Connections
THERMOSTAT INSTALLATION
The Thermostat should be located on an interior wall in
a larger room, away from supply duct draft. Position the
thermostat back plate against the wall so that it appears
level and so the thermostat wires protrude through the
middle of the back plate mounting holes and drill holes
with a 3/16” (5mm) bit. Install supplied anchors and
secure plate to the wall. Thermostat wire must be 18
AWC wire.

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APPLICATION
COOLING TOWER/BOILER APPLICATION
To ensure optimum cooling and heating performance,
the cooling tower and boiler loop temperature should be
maintained between 55-75°F in the heating mode and
60-95°F in the cooling mode. In the cooling mode, heat
is rejected from the heat pump’s refrigerant into the
water loop. A cooling tower and/or boiler may be
required to maintain proper water temperature within
the water loop. In an open cooling tower, chemical
water treatment is mandatory to ensure water is free of
corrosive materials
In heating mode, heat is absorbed from the water loop
into the heat pump’s refrigerant. A boiler may be utilized
to maintain the proper water temperature within the
loop.
CAUTION
A boiler may be required in the water loop to maintain
the loop water temperature between 55-75°F. Failure
to maintain proper water loop temperatures could
result in equipment failure and property damage, and
void warranties.
A secondary heat exchanger (plate frame between the
unit and the open cooling tower) may also be used. It is
imperative that all air is eliminated from the closed loop
side of the heat exchanger to prevent condenser fouling.
CAUTION
The manufacturer does NOT WARRANT equipment
subjected to abuse. Dirt, piping chips or other foreign
material can cause damage or failure to the water or to
refrigerant heat exchanger.
EXTENDED RANGE OPERATION
Piping systems expected to utilize water temperature
below 50°F require the extended range option, which
includes closed cell installation on all piping surfaces to
eliminate condensation. This application requires
sufficient antifreeze solution to prevent the water loop
against extreme temperature conditions and condenser
coil freezing. Frozen condenser coil are not covered
under warranty. A boiler may be required to maintain
the minimum water temperature within the loop.
CLOSED LOOPS
Failure to maintain proper water loop temperatures
could result in equipment failure and property damage,
and void warranties. Consult the factory when running
entering water temperatures below 50°F as additional
pipe insulation may be required to avoid excessive
sweating inside the unit. For applications below 50°F it is
imperative that the system be operated with antifreeze
solution.
When a secondary heat exchanger is used (i.e. plate to
plate; closed loop system) it is imperative that all air is
purged from the system to prevent condenser fouling.
CAUTION
The entire water loop must be completely cleaned and
flushed of all debris prior to final connections and unit
operation.
Valves should be adjusted to supply proper water flow
rated for the unit.
Failure to do so will VOID ALL FACTORY WARRANTY.

WSS6 Series
-
IOM
WSS6 SERIES – IOM (REV. A 4/21) 17
APPLICATION CONTINUED
WELL WATER APPLICATION
REQUIREMENTS:
 50° Minimum Entering Water Temperature
 Cupronickel Refrigerant Heat Exchanger
When a water well is used exclusively for supplying water to the heat pump, a cupronickel refrigerant heat exchanger is
required and the well pump should operate only when the heat pump operate. A 24 Volt contactor can be wired to the
ACC1 terminal on the Control Module which can be selected to be energize prior to or at compressor start-up, which
would in turn energize the water pump to operate with the heat pump.
WELL WATER APPLICATION DATA
Potential Failure
Mode
Water Chemistry Parameter Copper CuNi
Corrosion and
Scaling
pH Level 7-9 7-9
Hardness (Calcium or Magnesium
Carbonate)
< 350 ppm <350 ppm
Langelier Saturation Index (LSI) -0.5 to 0 -0.5 to 0
Ryznar Stability Index (RSI) 6.2 – 6.8 6.2 – 6.8
Hydrogen Sulfide < 0.5 ppm < 0.5 ppm
Sulfates < 125 ppm < 125 ppm
Chlorine < 0.5 ppm < 0.5 ppm
Chlorides < 20 ppm < 150 ppm
Carbon Dioxide < 5 ppm < 5 ppm
Ammonia < 2 ppm < 2 ppm
Ammonia Chloride, Nitrate, Hydroxide,
Sulfate
< 0.5 ppm < 0.5 ppm
Total Dissolved Solids (TDS) < 1000 ppm < 1500 ppm
Iron Fouling
Iron, Iron Bacteria < 0.2 ppm < 0.2 ppm
Iron Oxide < 1 ppm < 1 ppm
Erosion
Suspend Solids
< 10 ppm, < 600
Micron or 30 mesh
filter size
< 10 ppm, < 600
Micron or 30 mesh
filter size
Design Water Velocity 3 GPM/TON 3 GPM/TON
Table 5 - Well Water Application Data
CAUTION
Minimum entering water temperature is 50°F. Failure to
follow this warning could result in equipment failure
and property damage.
The discharge water from the heat pump is not
contaminated in any manner and can be disposed of in
various way depending upon local codes.
CAUTION
Close loop and pond applications require specialized
design knowledge. Do not attempt at these
installations without the licensed installer the received
specialized training.

WSS6 Series - IOM
WSS6 SERIES – IOM (REV. A 4/21) 18
CONTROLS
SEQUENCE OF OPERATIONS
FIGURE 14 - Sequence of Operations

WSS6 Series
-
IOM
WSS6 SERIES – IOM (REV. A 4/21) 19
CONTROLS CONTINUED
WSCM CONTROL MODULE
CONTROL FEATURES
 Anti-short Cycle Protection
 Random Start
 High and low Pressure Cut-out
 Water Coil Low Temperature Cut-out
 Over/Under Voltage Protection
 Fault Retry
 Lockout with Soft and Hard Reset
 Condensate Overflow Sensor
 Diagnostic LED Display
 Test Mode
 Alarm Relay
 Accessory Relays
 Vacated Mode
 Extended Compressor Operating Monitoring
MOTOR SPEED OPERATION
An ECM blower can be driven directly from the WSCM
control module. The control of the motor is based off
the input signals of G, Y1, and O. The blower speed is
automatically controlled via the WSCM module.
MOTOR SPEED OPERATION
Unit Call Fan Speed
G G1
Y G3
Y,O,G G2, then G3 after
10min of run time
Table 6 - Motor Speed Operations
FIELD CONTROLLABLE FUNCTIONS
TEST MODE
The unit can be placed into test mode by shorting the
test pins on the WSCM module. Once the pins are
shorted, the WSCM module will enter a test mode
period in which all time delays are sped up 15 times.
While in test mode the yellow LED2 will light up yellow.
Faults stored in memory can be cleared by entering into
test mode and exiting the test mode, or by a hard reset.
Test mode can be exited by shorting the test pins for
approximately 3 seconds.
NOTE
Test mode will be automatically exited after a 10
minute period.
NOTE
During test mode, the control will monitor to see if CO1
and CO2 freeze thermistors are present and correctly
installed. The controls will indicate fault code 19 if CO1
or CO2 are open, or if there is a jumper connecting
across the free sensors terminals.
VACATED PREMISES CONTROL
NOTE
Optional Vacated Premise Kit option must be installed
to operate in this mode.
The vacated premises operation is designed for
extended periods of un-occupancy when the occupant
wants the heat pump to operate in cooling mode for a
predetermined cycle time to help control indoor air
conditions. See Dip 1.7 for time selection (1 or 2 hours).
Additionally, the mode will store all faults seen over 24
hours in memory. If the same fault occurs for 4
consecutive days, the unit will go into a hard lockout.
The control kit consist of a rocker switch, wiring and a
programmed chip that is installed on the WSCM module
by a licensed contractor.
HOME SELECTION
If the switch is in the HOME position the heat pump will
operate in its normal mode.
AWAY SELECTION
If the switch is in the AWAY position the heat pump and
thermostat are set to “COOL” mode the heat pump will
operate in accordance to the thermostat setting.
Additionally, the heat pump will cycle on in cooling
mode for 15 minute run times either 4 or 8 times per
day depending on the Dip 1.7 selection. Thermostat still
has priority and will cycle the unit as needed.
NOTE
If the LED display is flashing “Ay” the thermostat is not
set in cooling mode.

WSS6 Series - IOM
WSS6 SERIES – IOM (REV. A 4/21) 20
CONTROLS CONTINUED
BOILERLESS CONTROL
The system can operate in boilerless mode by switching
Dip 1.5. If CO1 goes below the setting of Dip 1.6 the
compressor will be de-energized and control goes into
emergency heat mode staging on “W1”. The compressor
will be locked out for 60 minutes to prevent nuisance
cycling.
The set point for boiler less changeover temperature can
be adjusted by switching Dip 1.6.
WATER-COIL LOW TEMPERATURE CUT-OUT LIMIT
Jumpers JW1-CO1 provide field selection of the
temperature limit settings for CO1.
Not Clipped = 30°F Clipped = 10°F
CAUTION
For all applications below 50°F entering water
temperature, anti-freeze solution is required. Failure
to follow this warning could result in heat exchanger,
equipment or property damage.
ALARM RELAY SETTING
Jumper 3 (JW3 Alarm) provides field selection of alarm
relay terminal AL2 to be jumpered to 24VAC or to be
dry. The alarm relay is activated during lockout mode.
Not Clipped = AL2 Connected to “R”
Clipped = AL2 dry contacts (No connection)
DEHUMIDIFICATION MODE
The system can operate in Dehumidification mode by
switching Dip 1.4 on the WSCM module. In this mode,
the unit will run continuously in fan speed G2 when Y,O,
G calls are given to the board. Dehumidification mode
will not run in heating mode.
WSCM SAFETY FEATURES
ANTI-SHORT CYCLE PROTECTION
The WSCM module incorporates a 5 minute anti-short
cycle protection for the compressor.
RANDOM START
The WSCM module features a 5-80s random start upon
receiving a call to operate.
FAULT RETRY
While in Fault Retry Mode the LED will display a code
representing retry and the fault code. The unit will
initiate the Anti-short cycle timer and try to restart after
the delay. If 3 consecutive faults occur without satisfying
the thermostat the unit will go into hard lockout. The
last fault causing the lockout will be stored in memory
and displayed on the two digit LED display.
WATER-COIL LOW TEMPERATURE CUT-OUT (CO1)
The control module will recognize a CO1 fault during a
compressor run cycle if:
a) Thermistor temperature is below the selected set
point limit.
b) The thermistor temperature is rising at a rate less
than 2°F per 30s time period. The CO1 input is
bypassed for the first 120s of a compressor run
cycle. On the second and third retry CO1 is
bypassed for the initial 90s and 60s of run-time
respectively.
AIR COIL LOW TEMPERATURE CUT-OUT (CO2)
The control module will recognize a CO2 fault during a
compressor run cycle if:
a) Thermistor temperature is below the selected set
point limit.
b) The thermistor temperature is rising at a rate less
than 2°F per 30s time period. The CO2 input is
bypassed for the first 120s of a compressor run
cycle.
CONDENSATE OVERFLOW SENSOR
The condensate overflow sensor must sense overflow
levels for 30 continuous second to initiate a COF fault.
The condensate overflow sensor will be monitored
during the compressor run cycle.
LOW PRESSURE
The low pressure switch must be open and remain open
for 30 continuous seconds during the “on” cycle to be
recognized as a low pressure fault. The low pressure
switch input is bypassed for the initial 120s of
compressor run-time.
HIGH PRESSURE
If the high-pressure switch opens at any time, the
compressor relay is de-energized immediately.