AAON WH Series Owner's manual

WH Series
Horizontal Water-Source Heat Pump Unit
Installation, Operation
& Maintenance
If the information in this manual is not
followed exactly, a fire may result
causing property damage, personal
injury, or loss of life.
WARNING
QUALIFIED INSTALLER
Improper
installation, adjustment,
alteration, service,
or maintenance
can cause property damage,
personal injury or loss of life. Startup
and service must be performed by a
Factory Trained Service Technician.
Keep a copy of this IOM with the unit.
WARNING

3
Table of Contents
AAON WH Series Features and Options Introduction................................................................... 5
Safety .............................................................................................................................................. 6
WSHP Series Feature String Nomenclature ................................................................................. 10
General Information...................................................................................................................... 12
Codes and Ordinances .............................................................................................................. 12
Receiving Unit .......................................................................................................................... 13
Storage ...................................................................................................................................... 13
Direct Expansion (DX) Systems............................................................................................... 13
Wiring Diagrams....................................................................................................................... 14
Installation..................................................................................................................................... 14
Locating the Unit ...................................................................................................................... 14
Condensate Drain Piping .......................................................................................................... 15
Blower Assembly Removal – Side Access............................................................................... 18
Discharge Modification ............................................................................................................ 19
Lifting and Handling the Unit................................................................................................... 20
Horizontal Unit Bottom Access................................................................................................ 21
Blower Assembly Removal – Bottom Access.......................................................................... 22
Blower Motor and Fan Access.................................................................................................. 23
Refrigerant-to-Water Heat Exchanger Water Piping................................................................ 23
Electrical ................................................................................................................................... 27
How to Connect to WH Series Disconnect............................................................................... 29
Duct Connection ....................................................................................................................... 33
Waterside Economizer.............................................................................................................. 33
Startup........................................................................................................................................... 34
Supply Fans............................................................................................................................... 34
Fan Air Flow Adjustment ......................................................................................................... 34
Adjusting Refrigerant Charge................................................................................................... 35
Operation....................................................................................................................................... 38
AAON WSHP Pioneer Silver Controller.................................................................................. 38
AAON WSHP Pioneer Silver Expansion Board ...................................................................... 45
Maintenance.................................................................................................................................. 49
DX Cooling............................................................................................................................... 49
Condensate Drain Pans ............................................................................................................. 49
Supply Fans............................................................................................................................... 50
Microchannel Coil Cleaning..................................................................................................... 50
Filter Replacement.................................................................................................................... 51
Replacement Parts..................................................................................................................... 52
Warranty, Service, and Parts Department................................................................................. 52
Filter Information.......................................................................................................................... 52
Appendix A - Heat Exchanger Corrosion Resistance................................................................... 54
V81280 · Rev. F · 200721

4
Index of Tables and Figures
Tables:
Table 1 - WSHP WH Series Clearances....................................................................................... 17
Table 2 - Glycol Concentration.................................................................................................... 25
Table 3 - Water Connections ........................................................................................................ 26
Table 4 - Nameplate Voltage Markings........................................................................................ 27
Table 5 - Control Wiring............................................................................................................... 31
Table 6 - Acceptable Refrigeration Circuit Values at AHRI ISO 13256 WLHP Conditions....... 36
Table 7 - R-410A Refrigerant Temperature-Pressure Chart......................................................... 37
Table 8 - LED Diagnostic Codes.................................................................................................. 42
Table 9 - Glycol Percentage Setpoints.......................................................................................... 43
Table 10 - 006-012 WH Unit Series Filters (A Cabinet).............................................................. 52
Table 11 - 015-030 WH Series Unit Filters (B & C Cabinet) ...................................................... 52
Table 12 – 036 & 042 WH Series Unit Filters (D Cabinet).......................................................... 53
Table 13 – 048 & 060 WH Series Unit Filters (E Cabinet).......................................................... 53
Table 14 – 072 & 096 WH Series Unit Filters (F Cabinet) .......................................................... 53
Table 15 – 120 & 150 WH Series Unit Filters (G Cabinet).......................................................... 53
Figures:
Figure 1 – Access Panels .............................................................................................................. 13
Figure 2 - Foam Shipping Block................................................................................................... 14
Figure 3 - Mounting Horizontal Units .......................................................................................... 14
Figure 4 - Vibration Grommet Installation ................................................................................... 15
Figure 5 - Condensate Drain Piping.............................................................................................. 15
Figure 6 - Drain Trap .................................................................................................................... 16
Figure 7 - WH Series Unit Orientation (Right Return Unit Shown) ............................................ 17
Figure 8 - Blower Assembly with Captive Panel.......................................................................... 18
Figure 9 - Blower Assembly, Shown Pulled Away From Blower Panel...................................... 18
Figure 10 - Horizontal Unit Bottom Access ................................................................................. 21
Figure 11 - WH Bottom Access Panel.......................................................................................... 21
Figure 12 - Shipping Screw .......................................................................................................... 22
Figure 13 - Spade Connectors....................................................................................................... 22
Figure 14 - Release Button ........................................................................................................... 29
Figure 15 - Disconnect Terminals................................................................................................. 30
Figure 16 - Disconnect Faceplate ................................................................................................. 30
Figure 17 - Screws to Release Switch........................................................................................... 30
Figure 18 - Disconnect Terminals................................................................................................. 30
Figure 19 - Filter access Doors ..................................................................................................... 31
Figure 20 - Filter Rack Closed with Clip...................................................................................... 32
Figure 21 - Filter Rack Open with Clip ........................................................................................ 32
Figure 22 - Filter Pull.................................................................................................................... 32
Figure 23 – Using the Filter Pull................................................................................................... 32
Figure 24 - WSHP Series Supply Fan .......................................................................................... 34
Figure 25 – Pioneer Silver Controller Layout............................................................................... 40
Figure 26 - Pioneer Silver Expansion Board Layout.................................................................... 46

5
AAON WH Series Features and Options Introduction
Energy Efficiency
•Direct Drive Supply Fan
•Scroll or Rotary Compressor
•Closed Cell Neoprene Foam Cabinet
Insulation
•Waterside Economizer with 3-Way
Motorized Valve
•Electronically Commutated Motors
(ECM) or Permanent Split Capacitor
Motors (PSC)
•Copper or Cupronickel Coaxial
Refrigerant-to-Water-Heat Exchanger
•Microchannel Air Coils
•AHRI Certified Performance
Indoor Air Quality
•Multiple High Efficiency Filters up to
MERV 14 Rating
•Stainless Steel Drain Pan
•Closed Cell Neoprene Foam Cabinet
Insulation
Humidity Control
•ECM Fan Speed Dehumidification
•Hot Gas Reheat Dehumidification
Controls
•5 Wire Thermostat Control
Installation and Maintenance
•Tool-Less Access Panels
•Optional Bottom Service Access
•Color-Coded Wiring and Wiring
Diagram
•Non-Fused Service Disconnect
System Integration
•Waterside Economizer
•Hot Gas Reheat Humidity Control
Environmentally Friendly
•R-410A Refrigerant
•Recyclable Sheet Metal Shipping Pallet
Extended Life
•Induction Brazing
•Aluminum Cabinet
•Stainless Steel Drain Pan
•Cupronickel Coaxial Refrigerant-to-
Water Heat Exchanger
•Microchannel Aluminum Air Coil
Reduced Sound
•Sound Absorbing Cabinet Insulation
•Compressors mounted with rubber-in-
shear isolators on an isolation plate with
rubber-in-shear isolation to the cabinet
•Sound Absorbing Blower Insulation
•Compressor Sound Blanket
•Mass loaded vinyl available under
standard unit insulation for increased
sound dampening.

6
Safety
Rotation must be checked on all
COMPRESSORS AND MOTORS of 3
phase units at startup by a qualified
service technician.
Scroll compressors are directional
and can be damaged if rotated in the
wrong direction. Compressor rotation
must be checked for proper operation,
without using external refrigerant
pressure gauges.
Often, a
compressor running in reverse
rotation will be much louder than a
normal compressor, and will not
develop much of a temperature
differential between the suction and
discharge lines.
Fan motor rotation must
also be
checked for proper operation.
Alterations must only be made at the
unit power connection.
To prevent damage to the unit, do not
use acidic chemical coil cleaners. Do
not use
alkaline chemical coil
cleaners with a pH value greater than
8.5, after mixing, without first using
an aluminum corrosion inhibitor in the
cleaning solution.
Cleaning the cooling tower or the
water loop with harsh chemicals,
such as hydrochloric acid (muriatic
acid) or chlorine, can damage the
refrigerant-to-
water heat exchanger.
Care must be taken to avoid allowing
chemicals to enter the refrigerant-to-
water heat exchanger. See Appendix
A -
Heat Exchanger Corrosion
Resistance for more information.
Attention must be paid to the following statements:
NOTE - Notes are intended to clarify the unit installation, operation and maintenance.
CAUTION - Caution statements are given to prevent actions that may result in
equipment damage, property damage, or personal injury.
WARNING - Warning statements are given to prevent actions that could result in
equipment damage, property damage, personal injury or death.
CAUTION
CAUTION
CAUTION

7
PVC (Polyvinyl Chloride) and CPVC
(Chlorinated Polyvinyl Chloride) are
vulnerable to attack by certain
chemicals. Polyolester (POE) oils
used with R-
410A and other
refrigerants, even in trace amounts,
in a PVC or CPVC piping system will
result in stress cracking of the piping
and fittings and complete piping
system failure.
OPEN LOOP APPLICATIONS
Failure of the refrigerant-to-water
heat exchanger
as a result of
chemical corrosion is excluded from
coverage under AAON Inc.
warranties and the heat exchanger
manufacturer’s warranties.
Some chemical coil cleaning
compounds are caustic or toxic. Use
these substances only in accordance
with the manufacturer’s usage
instructions.
Failure to follow
instructions may result in equipment
damage, injury or death.
Do not work in a closed area where
refrigerant or nitrogen gases may be
leaking.
A sufficient quantity of
vapors may be present and cause
injury or death.
UNIT HANDLING
To prevent injury or death lifting
equipment capacity must exceed unit
weight by an adequate safety factor.
Always test-lift unit not more than 24
inches high to verify proper center of
gravity lift point to avoid unit damage,
injury or death.
ELECTRIC SHOCK AND FIRE
HAZARD
Failure to follow safety warnings
exactly could result in dangerous
operation, serious injury, death or
property damage.
Improper servicing could result in
dangerous operation, serious injury,
death, or property damage.

Before servicing, disconnect all
electrical power to the unit to
avoid shock hazard or injury from
rotating parts.
Follow proper
Lockout-Tagout procedures.
When servicing controls, label all
wires prior to disconnecting.
Reconnect wires correctly.

Verify proper operation after
servicing. Secure all service
panels.
CAUTION
WARNING
WARNING
WARNING
WARNING
WARNING

8
GROUNDING REQUIRED
All field installed wiring must be
completed by qualified personnel.
Field installed wiring must comply
with NEC/CEC, local and state
electrical code requirements. Failure
to follow code requirements could
result in serious injury or death.
Provide proper unit ground in
accordance with these code
requirements.
During installation, testing, servicing
and troubleshooting of the equipment
it may be necessary to work with live
electrical components. Only a
qualified licensed electrician or
individual properly trained in handling
live electrical components must
perform these tasks.
Standard NFPA-
70E, an OSHA
regulation requiring an Arc Flash
Boundary to be field established and
marked for identification of where
appropriate Personal Protective
Equipment (PPE) be worn, must be
followed.
ROTATING COMPONENTS
Unit contains fans with moving parts
that can cause serious injury. Do not
remove panel containing fans until
the power to the unit has been
disconnected and fan has stopped
rotating.
WATER FREEZING
Failure of the refrigerant-to-water
heat exchanger due to freezing will
allow water to enter the refrigerant
circuit and will cause extensive
damage to the
refrigerant circuit
components.
Any damage to the
equipment as a result of water
freezing is excluded from coverage
under AAON warranties and the heat
exchanger manufacturer warranties.
WATER PRESSURE
Prior to connection of condensing
water supply, verify water pressure is
less than maximum pressure shown
on unit nameplate. To prevent injury
or death due to instantaneous
release of high pressure water, relief
valves must be field supplied on
system water piping.
WARNING
WARNING
WARNING
WARNING
WARNING

9
1. READ THE ENTIRE INSTALLATION,
OPERATION AND MAINTENANCE
MANUAL. OTHER IMPORTANT
SAFETY PRECAUTIONS ARE
PROVIDED THROUGHOUT THIS
MANUAL.
2. Startup and service must be performed
by a Factory Trained Service
Technician.
3. The unit is for indoor use only. See
General Information section for more
unit information.
4. Every unit has a unique equipment
nameplate with electrical, operational,
and unit clearance specifications.
Always refer to the unit nameplate for
specific ratings unique to the model you
have purchased.

10
WSHP Series Feature String Nomenclature
Unit Configuration
:
Accessory Options
Gen
Major Rev
Size
Series
Minor Rev
Voltage
Eff. Level
Comp Style
Loop Type
Coil Type
Heat Type
Heat Staging
1
2
3A
3B
4
5
6A
6B
7
8
9
10
11
12
13
14
15
16
WH A
-
024
-
C
-
0
-
3
-
1
-
0
0
0
-
0
0
:
0
0
-
0
A
-
0
0
-
0
0
-
0
0
0
0
0
-
0
0
0
0
0
MODEL OPTIONS
Generation and Orientation
WH = Horizontal Water-Source Heat Pump
Major Revision
A
Unit Size
006 = 6,000 Btu/hr = ½ ton
009 = 9,000 Btu/hr = ¾ ton
012 = 12,000 Btu/hr = 1 ton
015 = 15,000 Btu/hr = 1 ¼ ton
018 = 18,000 Btu/hr = 1 ½ ton
024 = 24,000 Btu/hr = 2 ton
030 = 30,000 Btu/hr = 2 ½ ton
036 = 36, 000 Btu/hr = 3 ton
042 = 42,000 Btu/hr = 3 ½ ton
048 = 48,000 Btu/hr = 4 ton
060 = 60,000 Btu/hr = 5 ton
072 = 72,000 Btu/hr = 6 ton
096 = 96,000 Btu/hr = 8 ton
120 = 120,000 Btu/hr = 10 ton
150 = 150,000 Btu/hr = 12 ½ ton
Series
A = A Cabinet (006, 009 & 012)
B = B Cabinet (015 & 018)
C = C Cabinet (024 & 030)
D = D Cabinet (036 & 042)
E = E Cabinet (048 & 060)
F = F Cabinet (072 & 096)
G = G Cabinet (120 & 150)
Minor Revision
0 = Minor Revision 0
Voltage
3 = 460V/3Φ/60Hz
4 = 575V/3Φ/60Hz
A = 265V/1Φ/60Hz
B = 115V/1Φ/60Hz
C = 208-230V/1Φ/60Hz
D = 208-230V/3Φ/60Hz
Efficiency Level
1 = Std Efficiency Compact Box with PSC Motor
2 = Std Efficiency Compact Box with ECM Motor
4 = Std Efficiency Compact Box with Two-Step
Compressor & ECM Motor
Compressor Style
0 = R-410A On/Off Compressor - Heat Pump
A = R-410A Two-Step Compressor - Heat Pump
Loop Type
0 = Water Loop (Cooling Tower Only, EWT ≥ 60°F)
A = Ground Loop Application
B = Ground Water Application
Coil Type
0 = Copper Coaxial Refrigerant-to-Water Heat
Exchanger + Microchannel Air Coil
B = Cupronickel Coaxial Refrigerant-to-Water Heat
Exchanger + Microchannel Air Coil
Heat Type
0 = No Heating
Heating Staging
0 = No Heating
1: Unit Orientation
0 = Right Hand Return + Left Hand Supply
A = Right Hand Return + End Supply
B = Left Hand Return + Right Hand Supply
C = Left Hand Return + End Supply
2: Supply Fan
0 = Standard Fan + PSC Motor
B = Standard Fan + ECM Motor

11
WSHP Series Feature String Nomenclature
Unit Configuration
:
Accessory Options
Gen
Major Rev
Size
Series
Minor Rev
Voltage
Eff. Level
Comp Style
Loop Type
Coil Type
Heat Type
Heat Staging
1
2
3A
3B
4
5
6A
6B
7
8
9
10
11
12
13
14
15
16
WH A - 024 - C - 0 - 3 - 1 - 0 0 0 - 0 0 : 0 0 -
0
A
-
0
0
-
0
0
-
0
0
0
0
0
-
0
0
0
0
0
3A: Filter Rack*
0 = Open Return – Slide-Out Filter Rack
D = 4-Sided 2” Filter Rack - Return Duct Flange and
Access Panel
E = 4-Sided 2” Filter Rack + High MERV Filter Seal
- Return Duct Flange and Access Panel
F = 4-Sided 4” Filter Rack + High MERV Filter Seal
- Return Duct Flange and Access Panel
J = 4-Sided 1” Filter Rack + Access Panel - Return
Duct Flange and Access Panel
K = 4-Sided 1” Filter Rack + High MERV Filter Seal
- Return Duct Flange and Access Panel
* 1” Filter Rack for A Cabinet Only
3B: Filters
A = 2” MERV 8 Filter
B = 4” MERV 11 Filter
C = 4” MERV 13 Filter
D = 4” MERV 14 Filter
E = 1” MERV 8 Filter
F = 1” MERV 11 Filter
G = 1” MERV 13 Filter
4: Refrigeration and Dehumidification Options
0 = Standard
A = ECM Fan Speed Dehumidification
B = On/Off Hot Gas Reheat Dehumidification
5: Service Disconnect
0 = Standard - 5 KAIC
A = Non-Fused Service Disconnect - 30 Amp
B = Non-Fused Service Disconnect - 60 Amp
D = 5 KAIC Standard / 100 KAIC w/ Field Installed
Fusing
E = 100 KAIC Fusing
F = 100 KAIC Fusing w/ Fused Disconnect - 30 Amp
G = 100 KAIC Fusing w/ Fused Disconnect - 60
Amp
6A: Control Sequence
0 = Terminal Block for Thermostat + Pioneer Silver
Controller
A = Terminal Block for Thermostat + Pioneer Silver
Controller + Expansion Board
B = Pioneer Gold Controller
6B: Control Options
0 = Standard - No Communication
7: Cabinet Options
B = Closed Cell Neoprene Foam Cabinet Insulation +
Stainless Steel Drain Pan
C = Low Sound Package - Closed Cell Neoprene
Foam Cabinet and Blower Insulation + Compressor
Sound Blanket + Stainless Steel Drain Pan
0 = 1” Foil Face Cotton Fiber Cabinet Insulation +
Stainless Steel Drain Pan
A = Low Sound Package – 1” Foil Face Cotton Fiber
Cabinet and Blower Insulation + Compressor Sound
Blanket + Stainless Steel Drain Pan
E= Closed Cell Neoprene Foam Cabinet Insulation +
Mass Loaded Vinyl + Stainless Steel Drain Pan
8: WSE
0 = Standard - None
B = Waterside Economizer + 3-Way Motorized
Valve
9 & 10: Blank
00 = Standard - None
11: Code Options
0 = Standard - ETL USA Listing
B = ETL USA + Canada Listing
12: Shipping Options
0 = Standard - Sheet Metal Pallet with Forklift Slots
and AAON Blue Shrink Wrap
13: Cabinet Access
0 = Bottom Service Access Panel
A = Standard - No Bottom Access
14 & 15: Blank
00 = Standard - None
16: Cabinet
0 = All Aluminum Cabinet Construction

12
General Information
AAON WH Series Water-Source Heat
Pump units (WSHP) are designed for indoor
installation only. Units are assembled,
wired, charged and run-tested at the factory.
Certification of Cooling Models
a. Certified as a commercial central air
conditioner with electrically operated
compressors.
b. Certified for indoor installation only.
c. Certified with refrigerant R-410A coils.
Codes and Ordinances
WSHP Series units have been tested and
certified, by ETL, in accordance with UL
Safety Standard 1995/CSA C22.2 No. 236.
System must be sized in accordance with the
American Society of Heating, Refrigeration
and Air Conditioning Engineers Handbook.
Installation of units must conform to the
ICC standards of the International
Mechanical Code, the International Building
Code, Installation of Air Conditioning and
Ventilating Systems Standard, NFPA 90A,
and local building, plumbing and waste
water codes. All appliances must be
electrically grounded in accordance with
local codes, or in the absence of local codes,
the current National Electric Code,
ANSI/NFPA 70 or the current Canadian
Electrical Code CSA C22.1.
Improper installation, adjustment,
alteration, service or maintenance
can cause property damage,
personal injury or loss of life. Startup
and service must be performed by a
Factory Trained Service Technician.
A copy of this IOM must be kept with
the unit.
These units must not be used as a
“construction heater” at anytime
during any phase of construction.
Very low return air temperatures,
harmful vapors, and misplacement of
the filters can damage the unit and its
efficiency.
The Clean Air Act of 1990 bans the
intentional venting of refrigerant as of
July 1, 1992. Approved methods of
recovery, recycling, or reclaiming
must be followed.
Coils and sheet metal surfaces
present sharp edges and care must
be tak
en when working with
equipment.
WARNING
CAUTION
CAUTION
WARNING

13
Receiving Unit
When received, check the unit for damage
that might have occurred in transit. If
damage is found note on the carrier’s
Freight Bill. A request for inspection by
carrier’s agent must be made in writing at
once.
All units are shrink-wrapped in blue wrap. If
a unit shows up with any other color wrap,
the unit has been opened. Check unit
thoroughly for damage that necessitated re-
wrapping.
Check nameplate to ensure the correct
model sizes and voltages have been received
to match the job requirements.
If repairs must be made to damaged goods,
notify the factory before any repair action is
taken in order to protect the warranty.
Certain equipment alteration, repair, and
manipulation of equipment without the
manufacturer’s consent may void the
product warranty. Contact the AAON
Warranty Department for assistance with
handling damaged goods, repairs, and
freight claims: 918-382-6450.
Note: Upon receipt check shipment for
items that ship loose. Consult order and
shipment documentation to identify potential
loose-shipped items.
Figure 1 – Access Panels
Storage
If installation will not occur immediately
following delivery, store equipment in a dry
protected area away from construction
traffic and in the proper orientation as
marked on the packaging with all internal
packaging in place. Secure all loose-shipped
items.
Direct Expansion (DX) Systems
All systems are factory assembled, leak
tested, charged with R-410A refrigerant, and
run tested.
All systems include air coil, reversing valve,
liquid line filter dryer, thermal expansion
valve (TXV), and compressor.
Always control the unit from the thermostat,
or control panel, never at the main power
supply, except for emergency or complete
shutdown of the unit.
Failure to observe the following
instructions will result in premature
failure of your system and possible
voiding of the warranty.
WARNING

14
During the cooling season, if the airflow is
reduced due to dirty air filters or any other
reason, the cooling coils can get too cold
which can cause excessive liquid to return to
the compressor. As the liquid concentration
builds up, oil is washed out of the
compressor, leaving it starved for
lubrication.
The compressor life will be seriously
shortened by reduced lubrication and the
pumping of excessive amounts of liquid oil
and refrigerant.
Wiring Diagrams
Unit specific wiring diagrams are affixed
inside the control compartment panel.
Installation
AAON equipment has been designed for
quick and easy installation.
Before startup of the unit, check the supply
blower and remove the foam shipping block
that may be included to support the blower
assembly before installation, or damage may
occur.
Figure 2 - Foam Shipping Block
Locating the Unit
Placement of the unit relative to ductwork,
electrical and plumbing must be carefully
considered. Supply and return air plenum or
duct can be mounted directly to the duct
connection flanges. Use a properly sized
duct transition to connect supply duct to unit
supply air opening. Return duct flanges are
only included on units with the optional 4-
sided filter rack. Use flexible gasket material
to seal the duct to the unit.
Verify ceiling, floor, or foundation can
support the total unit weight, including
accessory weights.
To properly support the horizontal WSHP
unit and reduce sound and vibration, it must
be mounted level in both horizontal
directions. These units are designed to be
suspended via threaded rod (field provided)
through all four hanger brackets using the
four (4) vibration grommets (factory
provided) and 3/8” washers (field provided)
and as shown in Figure 3.
Figure 3 - Mounting Horizontal Units
Vibration grommets are factory provided
and must be field installed on units 6 tons
and larger.
Threaded Rod
(Field Provided)
Nut
(Field Provided)
3/8” Washer
(Field Provided)
Vibration
Grommet

15
Verify the top of the vibration grommet is
inserted into (or through) the hole provided
in the hanger bracket, as pointed out in
Figure 4.
Figure 4 - Vibration Grommet Installation
The threaded rod and nut must be
adequately sized to support the total unit
weight. Avoid installing units directly above
or adjacent to sound-sensitive areas.
Note: Ductwork must be supported
independently from the unit. The unit must
not support supply and/or return ductwork.
Allow adequate service clearances as shown
on the unit nameplate and unit drawing.
Consult your local building codes for
additional service clearance requirements.
Allow adequate space for piping access and
panel removal. Water piping is on the
compressor end and condensate drain
connections are located on the opposite end.
Figure 5 - Condensate Drain Piping
Floor Mounted Units
Make sure the unit is level and mounted on a
field supplied platform with a minimum
height to allow for proper depth of the
condensate line p-trap. Other installation
provisions may be necessary according to
job specifications.
It is recommended that a vibration isolation
pad be used when floor mounting a unit
Condensate Drain Piping
A p-trap and drain line must be installed on
horizontal units, with the p-trap not to
exceed 6” from the drain connection. Use
the same pipe size or larger as/than the drain
connection and pitch downward toward
drain. Use an air break in long runs of
condensate lines. Note: All horizontal units
require a field installed p-trap.
Emergency drain pan is
recommended for all applications
where a risk of water
damage to
surrounding structure or furnishings.
Refer to local codes.
Condensate
Drain
CAUTION

16
Draw-through cooling coils will have a
negative static pressure in the drain pan area.
This will cause an un-trapped drain to back
up due to air being pulled up through the
condensate drain piping.
Condensate drain trapping and piping must
conform to all applicable governing codes.
Note: The drain pan connection is an
unthreaded 7/8” stainless steel pipe stub.
Figure 6 - Drain Trap
The total height from the trap inlet to the top
of the bottom bend of the trap must be 2”
minimum.
The height from top of the bottom bend of
the trap to the bottom of the leaving pipe
must be at least equal to 1”. This ensures
that enough water is stored in the trap to
prevent losing the drain seal during unit
startup.
Unit must not be operated without p-
traps. Failure to install a p-trap may
result in overflow of condensate
water.
CAUTION

17
Table 1 - WSHP WH Series Clearances
Minimum Clearances Required
Capacity
Front/Control
Panel
Back
(Optional) Air Intake *Bottom
006, 009, 012
20
24
6
14
015, 018
20
20
6
20
024, 030
20
20
6
20
036, 042
20
20
6
24
048, 060
20
20
6
24
072, 096
20
20
6
20
120, 150
20
20
6
NA
*Note: If bottom service access is not available, optional dimensions are required.
Water Connections
Air Intake
(Filters)
End
Discharge
Straight
Discharge
End Discharge (Optional)
Air Intake
(Filters)
Straight
Discharge
Figure 7 - WH Series Unit Orientation (Right Return Unit Shown)

18
Blower Assembly Removal – Side Access
1) Using a 5
16
�”socket, remove the
shipping screw on the outside of the
right or discharge side of the unit as
shown in the figure below.
2) Remove the side blower access panel
using the panel handle and lift the panel
upwards about ½” or until it clears the
captive panel at the bottom of the blower
panel.
3) Pull the bottom of the blower panel out
about 10 degrees then down and away
from the unit
4) Grip the blower assembly with both
hands and lift it about ½” or until it
clears the captive panel at the assembly.
Figure 8 - Blower Assembly with Captive
Panel
Figure 9 - Blower Assembly, Shown Pulled
Away From Blower Panel
5) Pull the lower half of the blower mount,
away from the blower panel about 10
degrees.
Handle

19
6) Once the blower assembly is clear of the
blower panel, turn the blower assembly,
90 degrees, counter clockwise.
Caution: At any time, DO NOT rest
blower assembly on bottom access
panel, as damage may occur to the unit
7) Pull the blower assembly out of the unit.
Discharge Modification
The AAON WSHP discharge direction can
be selected in ECat and is also designed so
that the discharge direction can be field
modified if needed.
Note: DO NOT perform this action while
unit is hanging. It MUST be done on a solid
working surface. Otherwise, serious unit
damage may occur.
For WH-006
1) Use a5
16
�”socket to remove the four
(4) screws holding the blower panel
in place.
2) Firmly grip the blower panel and lift it
approximately ½” or until the bottom of the
blower panel clears the WSHP unit.
3) Pull the bottom of the blower panel out
about 10 degrees then down and away from
the unit.
4) Remove the side access panel.
5) Swap and install the two panels keeping
note of which side is up.
Note: Installing blower panel upside down
will result in damage to the unit.

20
For A Cabinet (009 & 012)
Remove the blower assembly as outlined in
the “Blower Assembly Removal – Side
Access” section before modifying the
discharge.
Once complete, proceed to the following:
1) Use a 5
16
�”socket to remove the four
(4) screws holding the blower panel
in place.
2) Firmly grip the blower panel and lift it
approximately ½” or until the bottom of the
blower panel clears the WSHP unit.
3) Pull the bottom of the blower panel out
about 10 degrees then down and away from
the unit.
4) Remove the side access panel as shown
in the “Blower Assembly Removal – Side
Access” section, step 2.
5) Swap the two panels keeping note of
which side is up. (Note: Installing blower
panel upside down will result in damage to
the unit.)
Ensure both the blower panel and side
access panels are installed correctly as
outlined in the “Blower Assembly Removal
– Side Access” section.
Lifting and Handling the Unit
Before lifting unit, be sure that all shipping
material has been removed from unit.
Unit may be lifted with a pallet jack.