Daikin IM 986-2 VHF Instruction Manual

Installation & Maintenance Manual
Vertical Stack Water Source Heat Pumps
Model VHC Vertical Stack Chassis
Model VHF Vertical Stack Cabinet
Unit Sizes 009 – 036 / R-410A Refrigerant
Group: WSHP
Part Number: 669646403
Date: May 2012
IM 986-2
©2012 McQuay International • 800.432.1342 • www.daikinmcquay.com

Page 2 of 48 / IM 986-2

IM 986-2 / Page 3 of 48
Table of Contents
Model Nomenclature ............................ 4-5
Vertical Stack Model VHF (Cabinet)...............4
Vertical Stack Model VHC (Chassis)...............5
Receiving, Storage & Handling ................... 6-7
Disassembling Upper & Lower Cabinet Sections..... 7-8
Dimensional Data.............................. 9-10
Unit Size 009-018..............................9
Unit Size 021-036.............................10
Pre-Installation Considerations ....................11
Cabinet Configurations...........................12
Typical Framing & Discharge Arrangements.........13
Critical Dimensions ..............................14
Framing Locations to Unit Openings..............14
Vertical Riser Stub-Outs Locations to
Unit Knockouts...............................14
Return Air Grille/Panel Dimensions...............15
Installation Procedure......................... 16-26
Risers & Cabinet........................... 16-17
Cleaning & Flushing Water System............ 17-19
Power Wiring From Building to Unit........... 19-20
Connect Condensate Drain Hose to Drain Stubout ...20
Water Connections ......................... 20-21
Installing Unit Chassis .........................22
Making Cabinet to Chassis Wiring Connections . . . . . 22
Installing & Wiring the Remote Control Node ......23
Installing the Return Air Grille/Panel..............24
Installing the Discharge Air Diffuser ..............25
Twin Units Installation .........................26
Controls..................................... 27-34
MicroTech III Unit Controller ...................27
Remote Reset Feature..........................27
MicroTech III Controller Terminal Locations
& Descriptions ............................ 28-29
I/O Expansion Module .........................30
MicroTech III Controller with Lon Module.........31
MicroTech III Controller with BACnet Module .. 32-33
MicroTech III Controller with Lon Module on
Board Diagram ...............................34
Typical Wiring Diagrams ...................... 35-38
MicroTech III Unit Controller, 2-Speed Fan (Toggle or
Thermostat), PSC Motor 208-230/60Hz/1-Phase,
Unit Sizes 009-018............................35
MicroTech III Unit Controller, 2-Speed Fan (Toggle or
Thermostat), PSC Motor 265-277/60Hz/1-Phase,
Unit Sizes 009-036............................36
MicroTech III Unit Controller, 2-Speed Fan (Toggle or
Thermostat), X13 Motor 208-230/60Hz/1-Phase,
Unit Sizes 021-036............................37
MicroTech III Unit Controller, 2-Speed Fan (Toggle or
Thermostat), X13 Motor 265-277/60Hz/1-Phase,
Unit Sizes 021-036............................38
Start-up........................................39
Additional Accessories (General) ................ 39-43
Thermostats & Temperature Sensors ........... 39-43
Troubleshooting .............................. 44-47
The in and outs of R-410A......................44
Refrigeration Circuit...........................45
The Water Source Heat Pump Unit ...............46
General Use & Information .....................47

Page 4 of 48 / IM 986-2
Vertical Stack Water Source Heat Pump – Cabinet (VHF)
Model Nomenclature
Unit Size - Tons
009 - 3/4 Ton
012 - 1 Ton
015 - 1-1/4 Ton
018 - 1-1/2 Ton
021 - 1-3/4 Ton
024 - 2 Ton
030 - 2-1/2 Ton
036 - 3 Ton
Controls
B - MicroTech III
C - MicroTech III With LonWorks
D - MicroTech III With BACnet
Voltage
A - 115/60/1 ph
E - 208-230/60/1 ph
J - 265-277/60/1 ph
Secondary Drain Pan
GL - Standard Galvanized Steel
SS - Stainless Steel
Product
Category
W - WSHP
Product Code
VHF - Cabinet
Design Series
1
2
Cabinet Type
080 - 80" Cabinet Height
088 - 88" Cabinet Height
092 - 92" Cabinet Height
096 - 96" Cabinet Height
Filter Option
S - Standard 1" Throwaway
P - 2" Pleated (Merv 7)
Y - None
Blower Motor
12 - 2-Speed PSC Motor
32 - ECM 2-speed 2.3 Motor
33 - ECM 2-speed X13 Motor
Power Connection
F - Fused Disconnect
N - Non-Fused Disconnect
H - HACR Breaker
Supply Air Conguration
LYY - Single Supply Outlet, Left Side
RYY - Single Supply Outlet, Right Side
FYY - Single Supply Outlet, Front Side
BYY - Single Back Side Supply Outlet
TYY - Single Top Supply Outlet
LFY - Double Supply, Left Side and Front Side
LRY - Double Supply, Left Side and Right Side
LBY - Double Supply, Left Side and Back Side
RFY - Double Supply, Right Side and Front Side
RBY - Double Supply, Right Side and Back Side
BFY - Double Supply, Back Side and Front Side
LTY - Double Supply, Left Side and Top
RTY - Double Supply, Right Side and Top
BTY - Double Supply, Back Side and Top
FTY - Double Supply, Front Side and Top
LFT - Triple Supply, Left Side, Front Side and Top
LRT - Triple Supply, Left Side, Right Side and Top
FRT - Triple Supply, Front Side, Right Side and Top
FBT - Triple Supply, Front Side, Back Side and Top
BRT - Triple Supply, Back Side, Right Side and Top
BLT - Triple Supply, Back Side, Left Side and Top
YYY - Closed Supply Plenum for eld modication
W VHF 1 009 B E DP LRY F 12 S 088
Note: For illustration purposes only. Not all options avail-
able with all models.
Please consult McQuay Sales Representative for
specic availability.

IM 986-2 / Page 5 of 48
Model Nomenclature
Vertical Stack Water Source Heat Pump – Chassis (VHC)
Unit Size - Tons
009 - 3/4 Ton
012 - 1 Ton
015 - 1-1/ 4 Ton
018 - 1-1/2 Ton
021 - 1-3/4 Ton
024 - 2 Ton
030 - 2-1/2 Ton
036 - 3 Ton
Controls
B - MicroTech III
C - MicroTech III With LonWorks
D - MicroTech III With BACnet
Voltage
A - 115/60/1 ph
E - 208-230/60/1 ph
J - 265-277/60/1 ph
Product
Category
W - WSHP
Product Code
VHC - Chassis
Design Series
1
2
Coax Coil Construction
C - Copper Inner - Steel Outer
S - CuproNickel Inner - Steel Outer
X - Special
Chassis Construction
AYY - Standard Fiberglass Insulation
EYY - IAQ - Cellular Insulation
AMY - Standard w/Compressor Blanket
EMY - IAQ w/Compressor Blanket
AYC - Standard w/E-Coated Air Coil
EYC - IAQ - Cellular w/E-Coated Air Coil
AMC - Standard w/Comp Blanket and Coated Air Coil
EMC - IAQ w/Comp Blanket and Coated Air Coil
Motorized 2-Way Isolation Valve
C - 2-Way Motorized 1/2" Iso-Valve, General Close-Off Pressure N.C.
(Normally Closed)
V - 2-Way Motorized 1/2" Iso-Valve, General Close-Off Pressure N.O.
(Normally Open)
H - 2-Way Motorized 1/2" Iso-Valve, High Close-Off Pressure N.C.
(Normally Closed)
D - 2-Way Motorized 3/4" Iso-Valve, General Close-Off Pressure N.C.
(Normally Closed)
K - 2-Way Motorized 3/4" Iso-Valve, General Close-Off Pressure N.O.
(Normally Open)
J - 2-Way Motorized 3/4" Iso-Valve, High Close-Off Pressure N.C.
(Normally Closed)
Y - None
X - Special
Refrigerant
A - R-410A
X - Special
W VHC 1 012 B E A C AMY C
Note: For illustration purposes only. Not all options
available with all models.
Please consult McQuay Sales Representative
for specic availability.

Page 6 of 48 / IM 986-2
Cabinet Skid (4-units per skid)
Never stack cabinets higher than as illustrated in Figure
1 at any time during transportation or storage or damage
may occur.
Figure 1: Unit Cabinet Skid as Shipped and Stored
Chassis Skid (4 per skid, stored two skids high)
Never stack chassis´ higher than as illustrated in Figure
2 at any time during transportation or storage or damage
may occur.
Figure 2: Chassis Skids Stacked 2 High Maximum
Storage and Operating Environment
Temporary storage at the job site must be indoor,
completely sheltered from rain, snow, etc. High or low
temperatures naturally associated with weather patterns
will not harm the units. Excessively high temperatures,
140°F (60°C) and higher, may deteriorate certain plastic
materials and cause permanent damage.
Storage Temperature:
-40ºF (-40ºC) to 140ºF (60ºC)
Operating Temperature:
32ºF (0ºC) to 140ºF (60ºC)
Humidity:
10%RH to 90%RH Non-condensing
PCB Material and Flammability Rating:
IPC/ANSI FR or CEM material as required to meet UL
94V-0 ammability rating.
Receiving and Storage
Upon receipt of the equipment, check the carton and
pallets for visible damage. Make a notation on the
shipper’s delivery ticket before signing. If there is any
evidence of rough handling, immediately open the
cartons to check for concealed damage. If any damage
is found, notify the carrier within 48 hours to establish
your claim and request their inspection and a report.
The Warranty Claims Department should then be
contacted.
For storing, each carton is marked with “up” arrows.
IMPORTANT
This product was carefully packed and thoroughly
inspected before leaving the factory. Responsibility for its
safe delivery was assumed by the carrier upon acceptance
of the shipment. Claims for loss or damage sustained in
transit must therefore be made upon the carrier as follows:
VISIBLE LOSS OR DAMAGE
Any external evidence of loss or damage must be noted
on the freight bill or carrier’s receipt, and signed by the
carrier’s agent. Failure to adequately describe such
external evidence of loss or damage may result in the
carrier’s refusal to honor a damage claim. The form
required to le such a claim will be supplied by the carrier.
CONCEALED LOSS OR DAMAGE
Concealed loss or damage means loss or damage which
does not become apparent until the product has been
unpacked. The contents may be damaged in transit due
to rough handling even though the carton may not show
external damages. When the damage is discovered upon
unpacking, make a written request for inspection by the
carrier’s agent within fteen (15) days of the delivery date
and le a claim with the carrier.
4'
6'

IM 986-2 / Page 7 of 48
DO NOT handle units by the riser piping. Riser clamps
hold the riser in position; they are not designed to
support the cabinet weight. The clamps are removed
after the unit is installed.
Unit cabinets are factory assembled and wired and
have individual thermostat control capability. They are
installed by stacking one unit on top of the other. While
installing, prevent dirt and other foreign matter from
entering the risers and plugging lines or valves. See
"Cleaning & Flushing Water System" on page 16.
General Information
McQuay Vertical Stack units are designed for use in
multiple oor apartments, ofce buildings, hotels,
nursing homes and other similar applications. They
require a minimum amount of oor space and are
designed for multiple discharge arrangement.
Installation and maintenance must follow accepted
industry practices as described in the ASHRAE
Handbook, the National Electric Code, and other
applicable standards. Install this equipment in
accordance with regulations of authorities having
jurisdiction and with all applicable codes.
WARNING
Installation and maintenance are to be performed by
qualied personnel who are familiar with local codes and
regulations, and experienced with this type of equipment.
WARNING
The installer must determine and follow all applicable
codes and regulations. This equipment presents hazards
of electricity, rotating parts, sharp edges, heat and weight.
Failure to read and follow these instructions can result in
property damage, severe personal injury or death. This
equipment must be installed by experienced, trained
personnel only.
Handling
Carefully check items against the bills of lading to
verify all crates and cartons have been received.
Cabinets and Chassis normally ship four to a pallet.
Carefully inspect all units for shipping damage. Report
damage immediately to the carrier and le a claim.
Check the unit data plate to be sure the unit electrical
agrees with the power supply available (Figures 3).
Component Descriptions (Assembled
Cabinet)
1. Cabinet assembly complete (without chassis)
1a. Pipe riser sets (inlet, outlet and condensate)
1b. Inner front panel and lter bracket
2. Cooling and heating chassis (shipped separate)
3. Return air grille/panel (accessory)
4. Double-deection diffuser (accessory)
Figure 3: Unit Components & Descriptions - Received as
Assembled Cabinet with Chassis Shipped Separate
1
1a
1b
1b
2
3
4
Unit
Data Plate
Stub-out
Seals
Chassis
Data Plate
CAUTION
Sharp metal edges are a hazard, use care when servicing
to avoid contact with them.
!

Page 8 of 48 / IM 986-2
Figure 5: Remove remaining eight (8) screws on the left and
right sides of the cabinet
Figure 6: Remove the ten (10) screws from the front panel/
lter rack.
Figure 7: Remove the six (6) screws located on the interior
of the unit.
Figure 8: Separate the lower cabinet section from the upper
cabinet
Four (4) screws located
on left side of cabinet
Disassembling Upper and Lower
Cabinet Sections
The Vertical Stack unit cabinet ships completely
assembled. If required, it may be disassembled into two
(2) sections (upper-fan/discharge cabinet) and (lower
chassis/return air cabinet) to make it easier to handle. To
disassemble, do the following.
1. Remove risers (if received attached).
2. Remove the three (bottom row) screws on the back
of the unit as shown in Figure 4.
Note: Retain all screws for later use to reassemble
unit in reverse order as described in steps 1-7.
Number of screws will vary depending on unit size.
3. Carefully lay the unit down on its back and remove
the remaining eight (8) screws on the left and right
side of the cabinet (Figure 5).
5. Remove the ten (10) screws and lift off the front
panel/lter rack to gain access to the cabinet interior
(Figure 6).
6. Locate and remove the six (6) screws located inside
the cabinet joining the upper and lower cabinet
sections (Figure 7).
Note: Pull the insulaton away from the walls of the
cabinet interior to get access to the screws.
7. Separate the lower return air cabinet section from
the upper blower/discharge cabinet section
(Figure 8).
Figure 4: Remove three (3) screws (bottom row) on the back
of the unit.
Back of Unit
Three screws (bottom row)
Return air cabinet
section interior

IM 986-2 / Page 9 of 48
Front View
Left Side View
Top View
Dimensional Data
Figure 9: Model VHC/VHF – 18" × 18" Cabinet – Size 009-018
Dimensions
Unit Size A B C D E F G J K L M N P Q
80" 18.07" 18.11" 37.50" .88" 58.09" 2.38" 3.125" 2" 2" 6.72" 12.4" 7.9" 3.3"
009–018 88" 18.07" 18.11" 37.50" .88" 58.09" 2.38" 3.125" 2" 2" 6.72" 12.4" 7.9" 3.3"
18" × 18" 92" 18.07" 18.11" 37.50" .88" 58.09" 2.38" 3.125" 2" 2" 6.72" 12.4" 7.9" 3.3"
Cabinet 96" 18.07" 18.11" 37.50" .88" 58.09" 2.38" 3.125" 2" 2" 6.72" 12.4" 7.9" 3.3"
A R S T U V
80" 3" 3" 3.3" 4.5" 4.5"
88" 3" 3" 3.3" 4.5" 4.5"
92" 3" 3" 3.3" 4.5" 4.5"
96" 3" 3" 3.3" 4.5" 4.5"
Discharge Openings
Unit Size Single Double Triple Single-Top Opening
W H WH WH W H
009 – 012 14" 16" 14" 8" NR NR 12" 12"
015 – 018 14" 16" 14" 8" 14" 8" 12" 12"
Table 1.
NR = Not Recommended

Page 10 of 48 / IM 986-2
Front View
Left Side View
Top View
Discharge Openings
Unit Size Single Double Triple Single-Top Opening
W H WH WH W H
021 – 024 NR NR 18" 10" 18" 10" 18" 18"
030 – 036 NR NR 18" 14" 18" 10" 18" 18"
A R S T U V
80" 3.09" 3.10" 3.12" 4.50" 4.50"
88" 3.09" 3.10" 3.12" 4.50" 4.50"
92" 3.09" 3.10" 3.12" 4.50" 4.50"
96" 3.09" 3.10" 3.12" 4.50" 4.50"
Dimensions
Unit Size A B C D E F G J K L M N P Q
80" 24" 24.04" 37.50" .88" 58.08" 2.38" 4.54" 2" 3" 6.72" 12.13" 7.63" 3.13"
021–036 88" 24" 24.04" 37.50" .88" 58.08" 2.38" 4.54" 2" 3" 6.72" 12.13" 7.63" 3.13"
24" × 24" 92" 24" 24.04" 37.50" .88" 58.08" 2.38" 4.54" 2" 3" 6.72" 12.13 7.63" 3.13"
Cabinet 96" 24" 24.04" 37.50" .88" 58.08" 2.38" 4.54" 2" 3" 6.72" 12.13" 7.63" 3.13"
Table 1.
NR = Not Recommended
Dimensional Data
Figure 10: Model VHC/VHF – 24" × 24" Cabinet – Size 021-036

IM 986-2 / Page 11 of 48
Pre-Installation Considerations
1. To prevent damage to equipment, do not operate
supplementary heating and cooling during the
construction period.
2. Inspect the carton for any specic tagging numbers
indicated by the factory per a request from the
installing contractor. At this time the voltage, phase
and capacity should be checked against the plans.
3. Check the unit size against the plans to verify that
the unit is being installed in the correct location.
4. Before installation, check the available dimensions
of the area where the unit is to be installed versus
the dimensions of the unit.
5. Note the location and routing of water piping,
condensate drain piping, and electrical wiring.
The locations of these items are clearly marked on
submittal drawings.
6. The installing contractor will nd it benecial
to confer with piping, sheet metal, and electrical
foremen before installing any unit.
Note: Check the unit data plate for correct voltage
with the plans before installing the equipment.
For Optimum Unit Performance and to
Help Minimize Noise and Vibration
● Adhere to the "Critical Dimensions" for locations of
framing and distances to the cabinet.
● Install a 1/4" thick vibration isolation pad under the
entire footprint of the unit cabinet base.
● Be sure there are no kinks and that the stainless
steel braided hoses do not come in contact with and
vibrate on chassis and cause noise.
● Ensure there is no metal-to-metal contact between
return air grille and cabinet and the discharge
diffuser and the cabinet, use provided gaskets.
● Air balancing in ducted applications is critical for
proper airow at each diffuser.
Figure 11: Typical Side by Side Unit Installation
WARNING
Make sure all electrical ground connections are made in
accordance with local code.
The contractor shall cover the units to protect the machines
during nishing of the building. This is critical while spraying
reproong material on bar joists, sandblasting, spray painting
and plastering.
WARNING
NOTICE
Top air discharge units will require turning vanes and/or a
volume damper for proper air flow and balancing, to mini-
mize turbulence. These components must be field-installed
and furnished in accordance with SMACNA guidelines.

Page 12 of 48 / IM 986-2
Cabinet Configurations
Figure 12: Single Side Discharge Figure 13: Double Side Discharge
Figure 14: Side & Top Discharge (See Notice on page 11) Figure 15:Double Side &Top Discharge (See Notice on page11)
Figure 16: Top Discharge (See Notice on page 11) Figure 17: Closed Plenum – Field Modication Required
= Return Riser = Supply Riser = Drain = Return Air = Discharge Air = Top Discharge

IM 986-2 / Page 13 of 48
Figure 18: Typical Framing & Discharge Arrangements
= Return Air
= Discharge Air
Typical Ducted
Application
Note: All ducted applications require a unit that utilizes an ECM-X13 or ECM 2.3 motor (sizes 021-036).
X13 motors are factory set for 2-speeds, 2 and 4 tap. For ducted unit applications only position 1 and 2-speed
motor taps should be used.
Additionally, static pressure must not exceed 0.40 inch static. See table below.
External Static Pressure, WC"
Unit Size Speed 0 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40
Speed 1
021 Speed 2
Speed 1
024 Speed 2
Speed 1
030 Speed 2
Speed 1
036 Speed 2
710
640
710
640
1060
930
1060
930
ECM-X13 Motor CFM - Sizes 021 - 036 External Static Pressure (Ducted Applications)
830
770
830
770
1200
1080
1200
1080
850
780
850
780
1230
1100
1230
1100
820
760
820
760
1180
1060
1180
1060
800
740
800
740
1160
1030
1160
1030
780
720
780
720
1140
1010
1140
1010
770
700
770
700
1120
990
1120
990
760
690
760
690
1100
970
1100
970
730
660
730
660
1080
950
1080
950
NOTICE
Top air discharge units will require turning vanes and/or a
volume damper for proper air flow and balancing, to mini-
mize turbulence. These components must be field-installed
and furnished in accordance with SMACNA guidelines.
Double Side Discharge

Page 14 of 48 / IM 986-2
Table 1: Reference Locations for Framing
Critical Dimensions
Location of studs is critical for proper installation and
t up and can help to reduce unit noise due to vibration
when properly installed.
Figure 19: Framing Locations to Unit Openings
2.38"
37.50"
58.08"
1/2" Conduit Fitting
for Electrical Supply
Unit Size 021-036 = 4.54"
Unit Size 009-018 = 3.125"
Unit Front
Return Air
Dimensions do not include 1/4" vibration isolation pad
Critical Dimensions
Note: If the unit cabinet was shipped without
risers attached it will be necessary to remove the
appropriate riser knockouts prior to positioning the
cabinet and connecting to the riser stub outs.
Figure 20: Vertical Riser Stub-Outs Locations to Unit
Knockouts
1Dimension includes approximately 1/4" for vibration isolation pad
2 Dimension “E” ± 0.125
3 Dimension “G” will vary based on diffuser size. Refer to Table 2, Discharge Knockout Openings on page 16.
4 Dimension “H” will vary based on cabinet height selected.
Unit Framing Locations
Size ABCD1E2F1G1, 3 H1, 4 JK L M N
80" 18" 2.07" 6" 22.25" 58.75" 61" 79" 3.125" 3.125"
18" × 18" 88" 18" 2.07" 6" 22.25" 58.75" 69" 87" 3.125" 3.125" 3.3" 7.9" 12.4"
92" 18" 2.07" 6" 22.25" 58.75" 73" 91" 3.125" 3.125"
96" 18" 2.07" 6" 22.25" 58.75" 77" 95" 3.125" 3.125"
80" 24" 2.125" 6" 28.25" 59.5" 63" 79" 4.54" 3.125"
24" × 24" 88" 24" 2.125" 6" 28.25" 59.5" 71" 87" 4.54" 3.125" 3.13" 7.63" 12.13"
92" 24" 2.125" 6" 28.25" 59.5" 75" 91" 4.54" 3.125"
96" 24" 2.125" 6" 28.25" 59.5" 79" 95" 4.54" 3.125"

IM 986-2 / Page 15 of 48
Critical Dimensions
Return Air Grille/Panel Dimensions
Location of studs in relation to the unit and the return
air grille panel are critical for proper installation and
t up. When installed, the return air grille gasket must
compress and seal completely against the outer edge of
the cabinet and around the inner front panel and lter
bracket. See page 24, “Installing The ReturnAir/Grill
Panel” and page 14, gure 19 “Framing Locations to
Unit Openings”.
Figure 21: Unit Sizes 009 - 018 (18" x 18" Cabinet) Figure 22: Unit Sizes 021 - 036 (24" x 24" Cabinet)

Page 16 of 48 / IM 986-2
Installation Procedure
Risers and Cabinet
1. Position the cabinet and risers within the building
pipe chase and align with the unit on the oor above
and/or below (Figure 23).
Figure 23: Position the Cabinet and Risers
Note: Refer to "Critical Dimensions", page 14 to
determine the correct recess depth from the front of
the unit to the drywall face. When the installation is
complete,the returnair grille/panelframe mustmeet
to seal with the cabinet discharge opening and the
discharge air diffuser duct must meet and seal with
the discharge opening.
2. Using the riser extensions, make preliminary riser
connections between the units above and or below
to assure proper riser alignment (supply, return and
condensate). See gure 20 on page 14.
3. After all components are aligned properly, anchor
the unit cabinet to the oor using the McQuay
provided mounting brackets (Figure 24).
4. Locate the two (2) mounting brackets in the parts
bag and position them near the back corners of
the unit, or one on a side and one on the back,
whichever location or combination is most suitable,
as illustrated in gure 24. Cut away an area of the
1/4" isolation pad at the mounting bracket locations.
Contractor is responsible for the appropriate
fasteners to secure the brackets to the oor, as local
codes dictate.
Figure 24: Position the Cabinet for Securing to the Floor
with Mounting Brackets (2)
IMPORTANT
A eld-supplied ¼” thick isolation pad should be installed now
(Figure 23).
1/4" Isolation Pad
Inlet, Outlet and
Condensate
Risers
Riser Couplings
Connect to Risers
on Unit Above
Risers Through
Floor Opening
Stud Wall Floor Plate
and Finish Wall
Location
Riser Extensions
Align and Connect
to Couplings and
Unit Above
Provided Mounting
Brackets (2)
Fasteners (by others)
Finished Wall
Stud Wall Floor Plate
Unit Front
Unit Cabinet 3
1
/
8
" from Finished Wall
Back of
Unit
1/4" Vibration
Isolation Pad
Installation and maintenance is to be performed only by qualied
personnel who are familiar with, and in compliance with state, local
and national codes and regulations, and experienced with this
type of equipment. Sharp edges and coil surfaces are potential
injury hazards. Avoid contact with them.
CAUTION
!
The cabinet must be centered between the wall studs and plumb
vertically for the grille/panel frame and diffuser to properly align
and seal to the cabinet. Use of a 4' level is recommended.
IMPORTANT

IM 986-2 / Page 17 of 48
Before furring-in units, hydrostatically test the risers and
unit connection joints in accordance with local building
codes, to make sure they are leak-proof.
Note: Perform "Cleaning and Flushing Water
System" Procedure Below.
When furring-in units make sure that no screws or nails
penetrate the unit cabinet.
8. Layout the stud wall oor plates and frame-in
unit referencing “Typical Framing & Discharge
Arrangements” on page 13 and “Critical Dimensions”
on page 14 and table 1.
Note: Before cutting and hanging drywall, remove
theappropriate discharge air opening knockout.See
Table 2). Protect unit from construction debris with a
protective cover.
Cleaning and Flushing Water
System
Prior to first operation of any unit, the water circulating
system must be cleaned and flushed of all construction dirt
and debris or damage will occur.
1. Prior to rst operation of any unit, the water
circulating system must be cleaned and ushed of all
construction dirt and debris.
If the units are equipped with water shutoff valves,
either electric or pressure operated, the supply and
return runouts must be connected together at each
unit location. This will prevent the introduction of
dirt into the unit (Figure 26).
CAUTION
Note: Be sure that each riser stub-out (supply &
return) are centered within the riser knockout in
the cabinet (Figure 25). If there is a void between
the stub-out and the stub-out seal on the cabinet
interior,this indicatesthat thestub-out is notproperly
centered within the knockout.
Figure 25: Center the Riser Stub-Outs in the Knockouts and
within Seals on the Cabinet Interior
5. Anchor risers to the building structure to prevent
vertical riser movement greater than, plus or minus
one inch to allow for riser expansion or contraction.
6. Solder all supply and return riser connections to
units above and/or below.
7. Remove riser ties used to secure the risers to the
cabinet during shipping.
Riser Knockouts
Stub-Out Connections with
Valves Centered within
Knockouts and Seals
Stub-Outs
Seals
Cabinet
Interior
Knockouts
on Cabinet
Exterior
CAUTION
WARNING
The unit is not designed to support the weight of the risers.
Anchor them securely to the building structure.
CAUTION
Discharge Openings
Unit Size Single Double Triple Single-Top Opening
W H WH WH W H
009–012 14" 16" 14" 8" NR NR 12" 12"
015–018 14" 16" 14" 8" 14" 8" 12" 12"
021–024 NR NR 18" 14" 18" 10" 18" 18"
030–036 NR NR 18" 14" 18" 10" 18" 18
Table 2: Discharge Knockout Openings
NR = Not Recommended

Page 18 of 48 / IM 986-2
Standard Range Geothermal Range
Units Units
Cooling Heating Cooling Heating
Min. Entering. Water  55°F/13°C 55°F/13°C 30°F/-1°C 20°F/-6°C
Normal Entering. Water 85°F/29˚C 70˚F/21°C 77°F/25˚C 40˚F/5°C
Max. Entering. Water  110°F/43°C 90°F/32°C 110°F/43°C 90°F/32°C
Once the system has been lled with clean water and
antifreeze (if used), precautions should be taken to
protect the system from dirty water conditions.
It is not McQuay International’s policy to make recommen-
dations on water treatment. However, the general contrac-
tor or owner should contact a local water treatment com-
pany regarding water treatment. A fouled closed loop water
system will lead to premature component failure.
Note: Contact a local water treatment company to
conrm water clarity prior to unit operation.
Dirty water will result in system wide degradation
of performance and solids may clog system-wide
valves, strainers, ow regulators, etc. Additionally,
the heat exchanger may become clogged which
reduces compressor service life or causes premature
failure.
6. Set the loop water controller heat add setpoint
to 70°F (21°C) and the heat rejection setpoint to
85°F (29°C). Supply power to all motors and start
the circulating pumps. After full ow has been
established through all components including the
heat rejector (regardless of season) and the vented
air and loop temperatures have been stabilized, each
of the units will be ready for check, test and start-up,
air balancing, and water balancing.
Standard Range Geothermal Range
Units Units
Cooling Heating Cooling Heating
Min. Ambient Air 50°F/10°C 50°F/10°C 40°F/5°C 40°F/5°C
Normal Ambient Air 80°F/27°C 70°F/21°C 80°F/27°C 70°F/21°C
Max. Ambient Air 100°F/38°C 85°F/29°C 100°F/38°C 85˚F/29°C
Min. Entering. Air  50°F/10°C 50°F/10°C 50°F/10°C 40°F/5°C
Normal Entering Air, 80°F/67°F 70°F 80°F/67°F 70°F
db/wb 27/19°C 21°C 27/19°C 21°C
Max. Entering Air 100/83°F 80°F 100/83°F 80°C
db/wb  38/28°C 27°C 38/28°C 27°C
Figure 26: Connections for ushing system piping
2. Fill the system at the city water makeup connection
with all air vents open. After lling, close all air vents.
The contractor should start main circulator with
the pressure reducing valve open. Check vents in
sequence to bleed off any trapped air, ensuring
circulation through all components of the system.
Power to the heat rejector unit should be off, and the
supplementary heat control set at 80°F (27°C).
While circulating water, the contractor should check
and repair any leaks in the unit and surrounding
piping. Drains at the lowest point(s) in the system
should be opened for initial ush and blow-down,
making sure city water ll valves are set to make up
water at the same rate. Check the pressure gauge at
pump suction and manually adjust the makeup to
hold the same positive steady pressure both before
and after opening the drain valves. Flush should
continue for at least two hours or longer until the
drain water is clean and clear.
3. Shut off supplemental heater and circulator pump
and open all drains and vents to completely drain
down the system. Short circuited supply and return
runouts should now be connected to the unit supply
and return connections. Do not use sealers at the
swivel are connections of hoses.
4. Flush system with water for 2 hours or longer until
water is clean.
5. Rell the system with clean water. Test the water
using litmus paper for acidity, and treat as required
to leave the water slightly alkaline (pH 7.5 to 8.5).
The specied percentage of antifreeze may also be
added at this time. Use commercial grade antifreeze
designed for HVAC systems only. Do not use
automotive grade antifreeze (See Table 5 on page 19
for Antifreeze Correction Factors).
NOTICE
CAUTION
Units must be checked for water leaks upon initial water
system start-up. Water leaks may be a result of mishan-
dling or damage during shipping. Failure by the installing
contractor to check for leaks upon start-up of the water
system could result in property damage.
At ARI flow rate.
Maximum and minimum values may not be combined. If one value
is at maximum or minimum, the other two conditions may not exceed the
normal condition for standard units. Extended range units may combine any
two maximum or minimum conditions, but not more than two, with all other
conditions being normal conditions.
Table 4: Water Limits
Table 3: Air Limits
Adapter, MPT x Straight Pipe Thread
included with flexible hoses
Note: Use for making connections to the
supply & return valves for the "Cleaning
and Flushing Water System" procedure.

IM 986-2 / Page 19 of 48
10% 20% 30% 40% 50%
Cooling Capacity 0.9910 0.9510 – – –
Heating Capacity 0.9950 0.9600 – – –
Pressure Drop 1.0350 0.9600 – – –
10% 20% 30% 40% 50%
Cooling Capacity 0.9980 0.9720 – – –
Heating Capacity 0.9950 0.9700 – – –
Pressure Drop 1.0230 1.0570 – – –
10% 20% 30% 40% 50%
Cooling Capacity 0.9900 0.9800 0.9700 0.9600 0.9500
Heating Capacity 0.9870 0.9750 0.9620 0.9420 0.9300
Pressure Drop 1.0700 1.1500 1.2500 1.3700 1.4200
10% 20% 30% 40% 50%
Cooling Capacity 0.9950 0.9920 0.9870 0.9830 0.9790
Heating Capacity 0.9910 0.9820 0.9770 0.9690 0.9610
Pressure Drop 1.0700 1.1300 1.1800 1.2600 1.2800
Table 5: Antifreeze Correction Factors
Ethylene Glycol
Propylene Glycol
Methanol
Ethanol
Power Wiring From Building to Unit
1. Locate the electrical power supply wiring from the
building and feed wiring through the 1/2" conduit
tting (strain relief) on the unit as shown in Figure
27 & 28, following local electrical codes and
regulations.
Figure 27: Supply Electric Wiring from Building to Unit
Figure 28: Wire to Unit Switch
2. If a remote wall-mounted thermostat is being used,
install a 24-volt thermostat wiring cable with at
least 6 wires from the unit low voltage terminal strip
(Figure 29) to the thermostat location.
3. If a wireless remote thermostat was ordered to
control the unit, it is recommended that the Remote
Control Node (RCN) be installed now.
Flexible Metal Conduit &
Strain Relief
1/2" Knockout for
Supply Wiring
DANGER
To avoid electrical shock, personal injury or death:
1. Installer must be qualied, experienced technician.
2. Disconnect power supply before installation to prevent
electrical shock and damage to equipment.
!

Page 20 of 48 / IM 986-2
Water Connections
All piping connections should be made using good
plumbing practices and in accordance with any and all
local codes that may apply.
Unit Piping Connection
Unit sizes 009 through 018 coil connections are
gooseneck style, made of copper tubing with 1/2" FPT.
Unit sizes 021 through 036 have 3/4" FPT connections
(Figure 31).
Shutoff/Balancing Valve
Each heat pump requires a shutoff valve on both the
supply and return risers for easy serviceability and
removal of the chassis when necessary.
We suggest using a factory installed 2-way motorized
isolation valve on the return line of the chassis and a
Auto Flow Regulator (AFR) installed on the supply line
which allows proper water ow in a given size unit.
Each valve package has 1/2" FPT or 3/4" FPT threaded
connections (Figure 32).
Figure 31: Typical Motorized Valve Piping
Adding A Motorized Valve & Auto Flow
Regulator
The Vertical stack water source heat pump chassis can
be congured with a 2-way motorized valve. The 2-way
motorized valve is mounted on the return line of each
unit and the Auto Flow Regulator (AFR) is mounted to
the supply line. Valve assemblies terminate with either
a 1/2" (unit sizes 009-018) or 3/4" (unit sizes 021-036)
NPT threaded connection and will accommodate factory
supplied hoses.
Figure29:Low Voltage Terminal StripforThermostatWiring
Note: See specic thermostat installation manual
for wiring and operation of thermostat. Install wall
mounted thermostat while completing dry wall
installation.
Connect Condensate Drain Hose to Drain
Stub Out
1. Remove the two (2) screws located along the back
edge of the drain pan, holding it in place
(Figure 30).
2. Adjust the direction of the condensate drain hose
and slip it over the drain stub out. Using the
provided clamp, secure the hose by tightening the
clamp.
3. Reinstall the secondary drain pan with the two (2)
screws removed in step 1.
Figure 30: Connect Drain Hose to Drain Stub Out
FPT Supply
Connection
2-Way
Motorized
Valve
Auto Flow
Regulator
FPT Return
Connection
Two (2) Screws Holding
Pan in Place
Drain
Stub Out
Hose Clamp
Thermostat Low
Voltage Terminal Strip
2-Speed
Fan Switch