The information in this manual supersedes and replaces previous catalogues with regards to McQuay Water Source Heat Pump products.
Illustrations cover the general appearance of McQuay International products at the time of publication and McQuay International reserves the
right to make changes in design and construction at anytime without notice.
™®The following are trademarks or registered trademarks of their respective companies: LonTalk from Echelon Corporation, BACnet from ASHRAE, Protocol
Selectability, and MicroTech II from McQuay International.
Engineering Guide Specications
............................37-39
Page 2 of 42 McQuay Large Horizontal Water Source Heat Pumps Catalog 1112-2
Introduction
Large Horizontal Water Source Heat
Pumps - Models CCH & CCW
Sizes 072-120 (6 to 10 Tons)
Model CCH (Standard Range: 55°F to 110°F)
Model CCW (Geothermal Range: 30°F to 110°F)
McQuay 6- to 10-ton horizontal units have a common
cabinet size and common water, condensate, and duct con-
nection locations for easier and more efcient installation.
The cabinet is constructed of unpainted, G-60 galva-
nized steel. Large panels provide access to the fan/motor
compartment and the compressor/control compartment.
The interiors of the top and side panels and the bottom of
the unit are covered with 1/2" thick, 1½ lb. dual-density
berglass insulation. The lter is supported by a factorymounted combination lter rack and return air duct collar,
eliminating the need for eld-mounted brackets.
The water and condensate connections protrude through
the outside of the cabinet. The water connections are FPT
type for easy connection to exible stainless steel hoses.
The large condensate connection provides effective conden-
sate removal.
The electrical components are located in the compressor
section of the unit. Holes are provided on the cabinet to facilitate main power and low voltage control wiring through
separate holes. All wiring connections are made internal to
the cabinet for maximum safety. Each unit is rated to accept
time delay fuses for branch circuit and is protected by a
resettable circuit breaker.
The standard control for all large capacity units is the
MicroTech™ III unit controller. The unit controller receives
its power from the 75VA control transformer.
A LonWorks® or BACnet® communication module is
available as an option.
Nomenclature
W CCH 1 120 B L Y S Y Y F
Product Category
W = WSHP
Product Identier
CCH = Large Horizontal - Standard Range
CCW = Large Horizontal - Geothermal
Design Series
1 = A Design 4 = D Design
2 = B Design 5 = E Design
3 = C Design
4. Drain Pan - Heavy-gauge, insulated, galvanized steel or op-
tional stainless steel.
5. Filters - Standard 2" factory-installed lter rack with 2" throw-
away lters. Filter rack outtted with duct collar.
6. Refrigerant Circuit - All units have a dual refrigerant circuit
with scroll compressors, thermal expansion valve, plate to
plate heat exchanger, nned tube airside coil, reversing valve
and service valves.
LED Annunciators
7. Electrical - The control enclosure includes components neces-
sary for proper unit operation. These components include,
but not limited to: fan relay, compressor contactors, 24 VAC
control transformer and control circuit boards.
8. Schrader Connections - Four Schrader valves are located in-
side the end access panel – one on the low side and one on the
high side of the refrigeration circuit – for charging and servic-
ing. All valves
are 7/16" SAE ttings.
9. MicroTech® III Controllers – Designed for exibility, the control
board is used in standalone applications in conjunction with
the I/O expansion module for control of the second refrigerant
circuit. A separate L
onWorks® or BACnet® communication
module can be easily snapped onto the Microtech III board to
allow communication with a building automation system. The
control system accomodates the use of a two-stage heat/two-
stage cool 7-day programmable or non-programmable wall-
mounted thermostat, offered as a eld-installed option.
10. LED Annunciators – External LED status lights display fault
conditions to provide easy troubleshooting and diagnosis, vis-
ible without removing the access panel.
11. External Pipe Connections – Supply and return pipe connec-
tions located outside the cabinet make pipe connections easy
without removing access panels.
Safety Controls (Not Shown) - Low and high refrigerant pres-
sure switches and low refrigerant suction temperature
(freezestat) sensor.
Page 4 of 42 McQuay Large Horizontal Water Source Heat Pumps Catalog 1112-2
CCH & CCW Features and Options
Cabinet Construction
McQuay 6- to 10-ton horizontal units have a common
cabinet size and common water, condensate, and duct connec-
tion locations for easier and more efcient installation.
The cabinet is constructed of heavy-gauge G-60 galva-
nized steel. Large panels provide access to the fan/motor
compartment and the compressor/control compartment. The
interiors of the top and side panels and the bottom of the unit
are covered with 1/2" thick, 1½ lb. dual-density berglass
insulation. Closed-cell foam (IAQ) insulation is available as
a selectable option, suitable for berglass-free applications.
The lter is supported by a factory-mounted combination lter
rack and return air duct collar, eliminating the need for eldmounted brackets.
The water and condensate connections protrude through
the outside of the cabinet. The water connections are FPT type
for easy connection to exible hoses. The large condensate
connection provides effective condensate removal.
The electrical components are located in the compres-
sor section of the unit. Holes are provided on the cabinet to
facilitate main power and low voltage control wiring through
separate holes. All wiring connections are made internal to the
cabinet for maximum safety. Each unit is rated to accept time
delay fuses for branch circuit and is protected by a resettable
circuit breaker.
Figure 1: Controls and Compressor Compartment
Extended range units include coil and piping insulation to
protect against condensation in low temperature geothermal
applications.
Safety controls include low suction temperature (freez-
stat) and high pressure switches to lock out compressor
operation at extreme conditions. The safety controls can
only be reset from the main disconnect switch - not from
the wall thermostat.
For additional safety, each unit has a 7 psi (48 kPa) low
pressure switch to protect the compressor from low refrig-
erant charge. The low setting prevents nuisance trips while
providing adequate protection.
Figure 2: Piping Compartment
Thermal Expansion Valve
Units include a Thermal Expansion Valve (TXV) for
refrigerant metering. The TXV allows the unit to operate at
optimum efciency with uid temperatures ranging from
25ºF to 110ºF (geothermal capable units only) and entering
air temperatures ranging from 40ºF to 90ºF. The TXV pre-
cisely meters the exact amount of refrigerant ow through
the system to meet the load and deliver rated heating and
cooling capacity.
Fan Section
The fan section includes the fan housing, fan wheel, fan
motor, adjustable sheave, high strength V-belt, and drain
pan. The standard drain pan is made of G-60 galvanized
Refrigeration System
Units have a dual circuit design and the two circuits
operate independently to enable load shedding when condi-
tions allow. Each circuit employs a random start feature to
prevent both compressors from energizing simultaneously
after an “unoccupied” cycle.
Units contain two of each refrigerant system compo-
nent, including high efciency compressors, plate-to-plate
heat exchangers, reversing valves, expansion valves,
high/low side refrigerant service valves, and required safety
controls. Large access panels are provided for easy service
access to any of these components.
The reversing valves are energized in the heating mode
and will “fail-safe” to the cooling mode, which is the pre-
dominant mode of operation.
The air-to-refrigerant coil is a dual circuit coil on one
slab. It is split equally along the horizontal axis for maxi-
mum efciency. The ns are lanced and the tubes have
nned edges on the inside to enhance heat transfer capabilities.
Catalog 1112-2 McQuay Large Horizontal Water Source Heat Pumps Page 5 of 42
steel and is insulated from the cabinet. A stainless steel
drain pan is available as an option. The pan has ample
height to allow self-priming of the condensate trap. The
fan motor is a single speed, high efciency PSC type with
an adjustable sheave for eld adjustment. The motor is iso-
lated from the fan housing to minimize vibration transmis-
sion to the cabinet. The fan housing protrudes through the
cabinet to provide adequate material to connect to a eldprovided exible duct collar. The fan discharge can exit
from the end or the side of the unit and must be congured
at the factory.
Optional Factory Installed Features
Geothermal range units are available for applications
requiring heating operation at reduced entering condi-
tions. The geothermal range unit will operate at 25ºF (5ºC)
minimum entering water temperature, 40ºF (5ºC) minimum
entering air temperature.
Control Options – Control Choices And Added Functionality
The control enclosure houses the major operating electri-
cal controls including the MicroTech® III controller and I/O
expansion module, control transformer, compressor relays
and fan relay. Each component is easily accessed for service
or replacement.
Three unique control choices are offered with the Micro-
Tech III control system:
■ Standalone operation using a MicroTech III controller and
I/O expansion module
■ MicroTech III controller and I/O expansion module with a
LonWorks® communication module
■ MicroTech III controller and I/O expansion module with a
BACnet® communication module
Each option features direct quick-connect wiring to all
unit-controlled components for “clean” wiring inside the
control box. Each control circuit board receives power from
a 75 VA transformer.
Table 1: Control Options
Control Description Application Protocol
MicroTech III
(Standalone)
The MicroTech III controller is a standalone microprocessor-based control
board conveniently located in the unit
control enclosure for easy accessibility.
The board is designed to provide thermostat control of a Water Source Heat
Pump using a two-stage wall thermostat. The unit controller provides unitwide control of the WSHP and control
of the rst refrigerant circuit.
Each unit controller is factory programmed, wired,
and tested for complete control of single zone, standalone operation of your McQuay Water Source Heat
Pump.
Unit Controller
with
I/O Expansion
Module
The I/O Expansion Module is an extension of the Microtech III controller and
provides control of the second refriger-
ant circuit. External LED status lights
display fault conditions to provide easy
troubleshooting and diagnosis of the
second circuit.
Allows for:
• Control of second refrigeration circuit.
Uni t-mounted
or wall-mounted
thermostat
Wal l-mount ed
the rmostat or
sensor
LonWorks
Communication
Module
BACnet
Communication
Module
Page 6 of 42 McQuay Large Horizontal Water Source Heat Pumps Catalog 1112-2
The MicroTech III control system
accepts a plug-in LonWorks commu-
nication module to provide network
communications and added functional-
ity to easily integrate with an existing
BAS. The communication module can
be factory- or field-installed and is
tested with all logic required to monitor
and control the unit.
The MicroTech III controller accepts
a plug-in BACnet communication
module to provide network commu-
nications and added functionality to
easily integrate with an existing BAS.
The communication module can be
factory- or eld-installed and is tested
with all logic required to monitor and
control the unit.
Designed to be linked with a centralized building
automation system (BAS) through a L
munications network for centralized scheduling and
management of multiple heat pumps.
Designed to be linked with a centralized building
automation system (BAS) through a BACnet communications network for centralized scheduling and
management of multiple heat pumps.
onWorks com-
L o nMa rk 3 .4
certied
BACnet
MS/TP
Control Features – MicroTech® III Unit Controller
The MicroTech III Controller is a microprocessor-based
control board conveniently located in the unit control box for
easy access through a removable access panel. The standalone
unit controller is a hard wired interface and provides all the
necessary eld connections. The board can be wired for 24volt AC output to the wall thermostat by using terminals R
& C. An LED annunciator is located on the front of the unit
chassis to allow quick check of the unit operating status.
MicroTech III Operating Features
Assumes cycle fan operation-not continuous fan operation:
■ Start-up – The unit will not operate until all the inputs
and safety controls are checked for normal conditions.
■ Cooling mode – On a call for cooling from the wall ther-
mostat, the controller will energize the fan relay and stage
compressors to satisfy the space temperature setpoint.
When the load is satised, the controller will disable the
compressor and fan.
■ Heating Mode – On a call for heating from the wall
thermostat, the controller will enable the fan, energize
circuit one reversing valve and circuit 1 compressor to
satisfy the space heating setpoint. If the space temperature
setpoint is not satiseld, circuit two reversing valve and
circuit 2 compressor will be energized and run until the
heating setpoint at the thermostat is satised.
■ Random Start Power-up Delay Timer – In the event of
a building power outage, this feature prevents multiple
units from starting simultaneously upon building power
restoration.
■ Unoccupied Mode – A simple “grounded” signal between
terminals U and C (no power source required), puts the
unit into the unoccupied mode for night setback operation.
■ Interstaging Timer – A default value of 5 minutes be-
tween staging of compressors, this feature minimizes short
cycling of compressors and improves comfort.
■ Override Mode – A switch on the deluxe automatic
changeover thermostat can be activated during the unoc-
cupied mode to put the unit back into the occupied mode
for two hours for after-hours heating or cooling.
■ Motorized Valve/Pump Restart – The IV/PR (H8) ter-
minals on the The MicroTech III unit controller are used
to energize (open) a motorized valve or start a water pump
to get water circulating prior to starting the compressor on
call for heating or cooling. The IV/PR (H8) terminal may
be “daisy chained” between a maximum of 200 units.
■ Brownout Protection – The MicroTech III unit controller
measures the input voltage and will suspend compres-
sor and fan operation if the voltage falls below 80% of
the unit nameplate rated value. A unique LED status is
generated.
■ Unit Shutdown – A simple grounded signal puts the unit
into the shutdown mode. Compressor and fan operations
are suspended. A unique LED status is generated.
■ Condensate Overow Protection – The MicroTech III
controller incorporates a liquid sensor at the top of the
drain pan. Upon sensing water ow, cooling operation is
suspended. A unique LED status is generated.
■ Remote Reset of Automatic Lockouts – The Remote
Reset feature provides the means to remotely reset auto-
matic lockouts generated by high-pressure and/or lowtemperature faults. When the MicroTech III controller is
in automatic lockout due to one of these faults, and the
cause of the fault condition has been alleviated, energizing the O-terminal for 10 seconds or more will force the
control board to clear the lockout. A unit power cycle can
also be used to clear an automatic lockout if the conditions
causing the fault have been alleviated.
■ Intelligent Reset – The Fault Retry feature helps to
minimize nuisance trips of automatic lockouts caused by
high-pressure and/or low-temperature faults. This feature
clears faults the rst two times they occur within a 24-hour
period and triggers an automatic lockout on the 3rd fault.
The retry count is reset to zero every 24 hours.
■ Equipment Protection Control – The MicroTech III
controller receives separate input signals from the refrigerant high-pressure switch and the low suction line tem-
perature sensor. In a high-pressure situation, compressor
operation is suspended. In a low temperature situation,
the unit goes into a defrost cycle where the unit is put
into cooling operation for 60 seconds until the coaxial
heat exchanger is free of ice. Each switch generates its
own unique LED status.
Note: Most unit fault conditions are the result of operating
the equipment outside the unit specications.
Table 2: MicroTech III Controller LED & Fault Outputs
Mode / Fault
Occupied, Bypass,
Standby, or Tenant Off On Off Energized
Override
Unoccupied On On Off Energized
Condensate Overow On Off Off De-energized
High Pressure 1 Fault Off Off Flash De-energized
Low Pressure 1 Fault Off Off On De-energized
Low Temperature 1 Fault Flash Off Off De-energized
Brownout
Emergency Shutdown Off Flash Off De-energized
Room/Return Air or Low
Temp Sensor 1 Failure
Service Test Mode
Enabled
Serial EEPROM
Corrupted
Network “Ofine”
Received
1
Compressor relay/compressor terminal is labeled COMP, switched line of
the same electric input as any of the L1 terminals.
Status LED’s
1
Yellow Green Red Output-Terminal “A”
Off Flash Off De-energized
Flash Flash On De-energized
Flash Flash Flash De-energized
On On On De-energized
Off Off Off De-energized
Thermostat Alarm Light
Catalog 1112-2 McQuay Large Horizontal Water Source Heat Pumps Page 7 of 42
Control Features – MicroTech III with I/O Expansion Module
I/O Expansion Module
The I/O Expansion Module is factory-installed for control
of the second refrigeration circuit.
The I/O Expansion Module has an independent LED an-
nunciator to identify operational fault conditions for the
second refrigeration circuit.
Table 3: I/O Expansion Module LED & Fault
Outputs
Terminal “A”
Invalid Conguration
Jumper Setting
Base Board
Communication Fail
High Pressure #2 Fault Off Off Flash De-energized
Low Pressure #2 Fault Off Off On De-energized
Unoccupied Mode On On Off Energized
Occupied, Bypass,
Standby, or Tenant
Override Modes
Note: Mode / Faults are listed in order of priority.
1
2
Mode / Fault
Low Suction Temp #2 Fault Flash Off Off De-energized
Service Test Mode Enabled Flash Flash Flash De-energized
Normal Operation Off On Off De-energized
Boilerless electric heat only
Alarm/fault LED indications take precedence over service test mode LED
indication. The controller shall use service test mode if the service test
mode jumper is installed, even if the LED’s indicate an alarm/fault.
Yellow Green Red
Status LED's
Flash Flash Off De-energized
Off Flash Flash N/A
Off On Off Energized
Thermostat Alarm
Light Output
Figure 3: I/O Expansion Module Conguration
Jumper Terminals
Jumper Terminals
JP1 shorted in units with
2 compressors
JP1 through JP8 not
used with 2 circuit units.
Page 8 of 42 McQuay Large Horizontal Water Source Heat Pumps Catalog 1112-2
Control Features – MicroTech III with Communication Module
MicroTech® III Controller with LonWorks® or
BACnet Communication Module
Each Ennity Large Vertical and Horizontal Water
Source Heat Pump can be equipped with a LonWorks or
BACnet communication module. The LonWorks module is
LonMark 3.4 certied and designed to communicate over a
LonWorks communications network to a Building Auto-
mation System (BAS). The BACnet module is designed to
communicate over a BACnet MS/TP communications net-
work to a building automation system. Both controllers are
microprocessor-based and can be factory or eld-installed.
The control modules are programmed and tested with all
the logic required to monitor and control the unit. Optional
wall sensors may be used with the communication modules
to provide limited local control of the Horizontal Water
Source Heat Pump. The MicroTech III controller monitors
water and air temperatures and passes information to the
communication module. The module communicates with
the BAS, to provide network control of the Water Source
Heat Pump.
MicroTech III LonWorks Communication Module
The LonWorks communication module is designed for
units that are integrated into a LonWorks communication
network for centralized scheduling and management of
multiple heat pumps.
MicroTech III Controller with Communication Modules
Features
The MicroTech III Controller with LonWorks or BACnet
Communication Module orchestrates the following unit
operations:
Enable heating and cooling to maintain space
temperature setpoint based on a room sensor setting
Enable fan and compressor operation
Monitors all equipment protection controls
Monitors room and discharge air temperatures
Monitors leaving water temperature
Relays status of all vital unit functions
An amber, on-board status LED indicates the status of the
MicroTech III LonWorks or BACnet module.
The MicroTech III Controller Includes:
A unit-mounted return air sensor
A unit-mounted discharge air sensor
A leaving water temperature sensor
The communication modules provide network access to
setpoints for operational control
Available Wall Sensors Include:
Room sensor
MicroTech III BACnet Communication Module
Designed to be linked with a centralized building auto-
mation system (BAS) through a BACnet communications
network for centralized scheduling and management of
multiple heat pumps.
Room sensor with LED status and tenant override
button
Temperature sensor with LED status, timed-override
button, and ±3°F setpoint adjustment
Room sensor with LED status, timed-override
button, 55° to 90°F setpoint adjustment
Catalog 1112-2 McQuay Large Horizontal Water Source Heat Pumps Page 9 of 42
Applications
Typical Horizontal Unit Installation
Unit Location
It is important to leave enough space for service person-
nel to perform maintenance or repair. Locate the horizon-
tal unit to allow for easy removal of the lter and access
panels. Allow a minimum of 18" (46 cm) clearance on each
side of the unit for service and maintenance access and
do not install the unit above any piping. Always be sure
to leave at least one side of the lter rack unobstructed so
that the service personnel will be able to slide the lter out.
Each unit is suspended from the ceiling by four 3/8" thread-
ed rods fastened to the unit by a hanger bracket and rubber
isolator. The design should place the unit directly below the
structural members so that it is securely anchored.
Avoid installing units directly above spaces where
building occupants will reside (e.g. above ofce desks or
classrooms) to reduce the requirement for noise attenuation.
Do not place units above high trafc areas because service
access may be limited during occupied hours. For example,
units are typically installed above the hallway drop ceiling
in Schools and the supply and return air is routed directly
into classrooms. Local code may require re dampers to be
used with this application.
Piping
The WSHP unit is typically connected to the supply/return piping using a “reverse return” piping system which
includes a ow control device so that ow requirements are
met for each zone. A short, high pressure “exible hose” is
used to connect the unit to the building’s hard piping and
Figure 4: Typical Ceiling Installation
acts as a sound attenuator for both the unit operating noise
and hydraulic pumping noise. One end of the hose has a
swivel tting to facilitate removal of the unit for replace-
ment or service. Include supply and return shutoff valves
in the design to allow removal of a unit without the need to
shut down the entire heat pump system. The return valve
may be used for balancing and will typically have a “memory stop” so that it can be reopened to the proper position
for the ow required. Fixed ow devices are commercially
available and can be installed to eliminate the need for
memory stop shut off valves. Include Pressure / Temperature ports to allow the service technician to measure water
ow and unit operation.
Condensate Drain Piping
Condensate piping can be made of steel, copper or PVC
pipe. In most cases, PVC pipe eliminates the need to wrap
insulation around the pipe to prevent sweating. A threaded,
factory supplied condensate tting allows the connection of
PVC, exible vinyl hose or steel braided hose.
The condensate piping must be trapped at the unit and
pitched away from the unit not less than 1/4" per foot. A
vent is required after the trap so that the condensate will
drain away from the unit. The vent can also act as a clean
out if the trap becomes clogged. To avoid having waste
gases entering the building, the condensate drain should
not be directly piped to a drain/waste/vent stack. See local
codes for the correct application of condensate piping to
drains.
Figure 5: Typical Condensate Piping
Condensate
Drain (P Trap)
1 1/2"
(38mm)
Page 10 of 42 McQuay Large Horizontal Water Source Heat Pumps Catalog 1112-2
1 1/2"
(38mm)
Optional
Field Installed Vent
1/4" Per Foot
(21mm Per Meter)
Ductwork and Sound Attenuation Considerations
Applications
Ductwork is normally applied to ceiling-mounted heat
pumps on the discharge side of the unit. A discharge collar
is provided on all horizontal unit models for fastening the
ductwork. Use a exible connector between the discharge
collar and the duct transformation to help reduce vibration
straight length of duct, 5 to 10 times the duct width, before
the next tting to smooth out airow. Diffusers that are lo-
cated in the bottom of a trunk duct can also produce noise.
For this same reason, volume control dampers should be
located several duct widths upstream from an air outlet.
transmission from the cabinet and to simplify disconnection
of the unit from the ceiling ductwork. If return ductwork
is to be used, attach a exible connector to the lter rack
collar to help reduce vibration transmission and removal of
the unit. Return plenum ducting should be at least 12 inches
away from the coil so that the coil is evenly loaded with
return air.
For Hotel, Motel, Dormitory or Nursing Home applica-
tions that use a single duct discharge, a velocity of 500 to
600 fpm is suggested. These applications typically have
static pressures as low as 0.05 inches of water and duct
lengths approximately six feet in length. The discharge
duct must be fully lined and have a square elbow without
turning vanes. Return air for these applications should
As a general recommendation, duct interiors should
have an acoustic / thermal lining at least 1/2 inch thick
over the entire duct run. For better sound attenuation, line
the last ve diameters of duct before each register with a
one-inch thick sound blanket. Elbows, tees and dampers
can create turbulence or distortion in the airow. Place a
enter through a “low” sidewall lter grille and route up the
stud space to a ceiling plenum. For horizontal heat pumps
mounted from the ceiling, an insulated return plenum is
sometimes placed at the return air opening to further
attenuate line-of-sight sound transmission through return
openings.
Figure 6: Suggested Supply Ducting per ASHRAE and SMACNA Publications
Flexible Connector
Acoustic/Thermal Lining
3ft. (.9m) to 5ft. (1.5m)
Acoustic/Thermal
Lining
Diffuser
(Ductwork Sized Based on Airow)
Figure 7: Suggested Return Ducting per ASHRAE and SMACNA Publications
Two 90° Turns Prior to the Intake
(Ductwork Sized Based on Airow)
Ductwork Supported
Independent of Unit
Acoustic/Thermal
Lining
Flexible Connector
Ductwork Supported
Independent of Unit
Diffuser
Two 90° Turns
Acoustic/Thermal
Lining
Return Air Intake
Located
Away from the
Unit Blower
Catalog 1112-2 McQuay Large Horizontal Water Source Heat Pumps Page 11 of 42
Acoustic/Thermal
Lining 10ft. (3 meters)
Flexible Connector
Applications
Typical Cooling and Heating Refrigeration Cycles – Dual Compressors
Note: Typical temperature readings are at full load conditions at ISO-13256 for boiler-tower applications.
Figure 8: Cooling Refrigeration Cycle
When the wall thermostat calls for COOLING, the revers-
ing valve (de-energized) directs the ow of the refrigerant,
a hot gas, from the compressor to the water-to-refrigerant
heat exchanger (coaxial heat exchanger). There, the heat is
removed by the water, and the hot gas condenses to become
a liquid. The liquid then ows through a thermal expansion
valve to the air-to-refrigerant heat exchanger coil (evapora-
tor). The liquid then evaporates and becomes a gas, at the
same time absorbing heat and cooling the air passing over the
surfaces of the coil. The refrigerant then ows as a low pres-
sure gas through the reversing valve and back to the suction
side of the compressor to complete the cycle.
Figure 9: Heating Refrigeration Cycle
When the wall thermostat calls for HEATING, the
reversing valve (energized) directs the ow of the refriger-
ant, a hot gas, from the compressor to the air-to-refrigerant
heat exchanger coil (condenser). There, the heat is removed
by the air passing over the surfaces of the coil and the hot
gas condenses and becomes a liquid. The liquid then ows
through a thermal expansion valve to the water-to-refrigerant
heat exchanger (evaporator). The liquid then evaporates and
becomes a gas, at the same time absorbing heat and cooling
the water. The refrigerant then ows as a low pressure gas
through the reversing valve and back to the suction side of
the compressor to complete the cycle.
Page 12 of 42 McQuay Large Horizontal Water Source Heat Pumps Catalog 1112-2
Applications – Systems
Water source heat pump systems are one of the most ef-
cient, environmentally friendly systems available for heating
and cooling buildings. High-efciency, self contained units
(sizes 7,000 btuh to 290,000 btuh) can be placed in virtually
any location within a building. Each unit responds only to
the heating or cooling load of the individual zone it serves.
This permits an excellent comfort level for occupants, better
control of energy use for building owners and lower seasonal
operating costs. The Air-Conditioning Refrigeration Institute
(ARI) and the International Standards Organization (ISO)
publish standards so that water source heat pumps are rated
for specic applications. The ARI/ISO loop options shown in
this catalog are typical water source heat pump loop choices
available in today’s market. These systems offer benets rang-
ing from low cost installation to the highest energy efciency
available in the market today.
Boiler / Tower Applications: ARI 320 / ISO
13256-1
A “Boiler/Tower” application uses a simple two-pipe
water circulating system that adds heat, removes heat or
transfers rejected heat to other units throughout the build-
ing. The water temperature for heating is generally main-
tained between 65ºF – 70ºF and is usually provided by a
natural gas or electric boiler located in a mechanical room.
The condensing water temperature, during cooling months,
is maintained between 85ºF and 95ºF and requires the use
of a cooling tower to dissipate waste heat. Cooling tow-
ers can be located on the roof, or inside or adjacent to the
building. This application can be the lowest cost of the loop
options available.
Note: ASHRAE 90.1 standards require that circulating
pumps over 10 HP will require use of “variable frequency
drive” equipment and pipe insulation to be used whenever
water temperatures are below 60 degrees and above 105
degrees. See ASHRAE 90.1 Standards for details.
Open Loop Well Water Applications: ARI
325 / ISO 13256-1
“Open Loop” well water systems use ground water
to remove or add heat to the interior water loop. The
key benet of an open loop system is the constant water
temperature, usually 50ºF to 60ºF, which provides efcient
operation at a low rst cost. Most commercial designers
incorporate a heat exchanger to isolate the building loop
from the well water. Using heat exchangers can reduce
maintenance issues while still allowing the transfer of heat
from unit to unit as with the “Boiler/Tower System”. A successful design provides an ample amount of groundwater
(approximately 2 GPM per ton) and adequate provisions
for discharging water back to the aquifer or surface. Open
Loop applications are commonly used in coastal areas
where soil characteristics allow reinjection wells to return
the water back to the aquifer. Note that some states have requirements on the depths of return water reinjection wells,
and such wells must be approved by the United States En-
vironmental Protection Agency. Also, bad water quality can
increase problems with heat exchanger scaling. Suspended
solids can erode the heat exchanger. Strainers can be used
to contain suspended solids.
Figure 11: Open Loop Well Application
Figure 10: Boiler/Tower Application
Catalog 1112-2 McQuay Large Horizontal Water Source Heat Pumps Page 13 of 42
Applications – Systems
Closed Loop Geothermal Applications ARI
330/ISO 13256-1
“Vertical Closed Loop” applications are installed by
drilling vertical bore holes into the earth and inserting
a plastic polyethylene supply/return pipe into the holes.
The vertical wells are connected in parallel reverse return
fashion to allow the water from the building to circulate
evenly throughout the boreeld. The circulating uid dissipates heat to the ground in a similar manner as a “tower”
and adds heat back to the loop like a boiler. If properly
designed, the loop eld can maintain the loop temperatures
necessary to condition the building without the use of a
boiler or a tower. Loop temperatures usually range from
37ºF to 95ºF in Northern climates. Southern applications
can see temperatures ranging from 40ºF to 100ºF. The
number of bore holes and their depth should be determined
by using commercial software that is specically designed
for vertical geothermal applications. Typical bore depths
of a vertical loop range from 150 to 400 feet and generally
require about 250 feet of surface area per ton of cooling.
Figure 12: Vertical Loop Application
Figure 13: Horizontal Loop Application
A “Surface Water” or “Lake” closed loop system is a
geothermal loop that is directly installed in a lake or body
of water that is near the building. In many cases, the body
of water is constructed on the building site to meet drainage
or aesthetic requirements. Surface loops use bundled
polyethylene coils that are connected in the same manner
as a vertical or horizontal loop using a parallel reverse
return design. The size and the depth of the lake is critical.
Commercial design services should be used to certify that a
given body of water is sufcient to withstand the building
loads. Loop temperatures usually range from 35ºF to 90ºF
and prove to be the best cooling performer and lowest
cost loop option of the three geothermal loops. Some
applications may not be good candidates due to public
access or debris problems from ooding.
Figure 14: Surface Water Loop Application
A closed loop “Horizontal” geothermal application
is similar to a vertical loop application with the exception
that the loops are installed in trenches approximately 5
feet below the ground surface. The piping may be installed
using a “four-pipe” or “six-pipe” design and could require
1,500 to 2,000 square feet of surface area per ton of
cooling. Loop temperatures for a commercial application
can range from 35ºF to 95ºF in Northern climates. Southern
climates can see temperatures ranging from 40ºF to
100ºF. Horizontal loops are generally not applied in urban
areas because land use and costs can be prohibitive. New
advances in installation procedures have improved the
assembly time of horizontal loops while keeping the rst
cost lower than a vertical loop.
Page 14 of 42 McQuay Large Horizontal Water Source Heat Pumps Catalog 1112-2
ISO Performance Data
Table 4: Water Loop
Unit Size
CFM L/S GPM L/S Btuh
072
096
120
Note: Water Loop Performance Data – Rated in Accordance with ISO Standard 13256-1
Table 5: Ground Loop
Unit Size
CFM L/S GPM L/S Btuh
072
096
120
Note: Ground Loop Performance Data – Rated in Accordance with ISO Standard 13256-1
Airow Waterow
1133
2400
3000
4000
1416
1888
20.1
23.6
30.1
Airow Waterow
1133
2400
3000
4000
1416
1888
20.1
23.6
30.1
1.27
1.49
1.90
1.27
1.49
1.90
Voltage
208/230-60-3
460-60-3
575-60-3
208/230-60-3
460-60-3
575-60-3
208/230-60-3
460-60-3
575-60-3
Voltage
208/230-60-3
460-60-3
575-60-3
208/230-60-3
460-60-3
575-60-3
208/230-60-3
460-60-3
575-60-3
78100
94900
121800
77700
97300
124600
Cooling Heating
Watts EER COP Btuh Watts COP
22868
27788
35664
13.4
14.8
14.4
3.9
4.3
4.2
Cooling Heating
Watts EER COP Btuh Watts COP
22751
28490
36484
16.3
16.8
16.0
4.8
4.9
4.7
82700
94300
126200
58700
66100
92500
24215
27612
36953
17188
19355
27085
4.4
4.3
4.4
3.7
3.3
3.6
Table 6: Ground Source
Unit Size
CFM L/S GPM L/S Btuh
072
096
120
Note: Ground Source Performance Data – Rated in Accordance with ISO Standard 13256-1
Airow Waterow
1133
2400
3000
4000
1416
1888
20.1
23.6
30.1
1.27
1.49
1.90
Voltage
208/230-60-3
460-60-3
575-60-3
208/230-60-3
460-60-3
575-60-3
208/230-60-3
460-60-3
575-60-3
82500
103100
134400
Cooling Heating
Watts EER COP Btuh Watts COP
24157
30189
39354
21.3
21.5
20.7
6.2
6.3
6.1
71400
79800
115700
20907
23366
33878
4.2
3.8
4.2
Catalog 1112-2 McQuay Large Horizontal Water Source Heat Pumps Page 15 of 42
Cooling Capacity Data – Large Horizontal, Size 072 @ 2400 SCFM
Page 22 of 42 McQuay Large Horizontal Water Source Heat Pumps Catalog 1112-2
Operating Limits
Table 9: Air Limits - °F (English units)
Standard Range Geothermal RangeUnits Units
Cooling
Min. Ambient Air 50ºF 50ºF 40ºF 40ºF
Normal Ambient Air 80ºF 70ºF 80ºF 70ºF
Max Ambient Air 100ºF 85ºF 100ºF 85ºF
Min. Entering Air
Normal Entering Air db/wb 80/67ºF 70ºF 80/67ºF 70ºF
Max Entering Air db/wb
1,2
50ºF 50ºF 50ºF 40ºF
1,2
100/83ºF 80ºF 100/83ºF 80ºF
Heating Cooling Heating
Table 10: Air Limits - °C (SI units)
Standard Range Geothermal Range
Units Units
Cooling
Min. Ambient Air 10ºC 10ºC 5ºC 5ºC
Normal Ambient Air 27ºC 21ºC 27ºC 21ºC
Max Ambient Air 38ºC 29ºC 38ºC 29ºC
Min. Entering Air
Normal Entering Air db/wb 27/19ºC 21ºC 27/19ºC 21ºC
Max Entering Air db/wb
1,2
10ºC 10ºC 10ºC 5ºC
1,2
38/28ºC 27ºC 38/28ºC 27ºC
Heating Cooling Heating
Table 11: Water - °F (English units)
Standard Range Geothermal Range
Units Units
Cooling
Min. Entering Water
Normal Entering Water 85ºF 70ºF 77ºF 40ºF
Max Entering Water 110ºF 90ºF 110ºF 90ºF
1,2
55ºF 55ºF 30ºF 20ºF
Heating Cooling Heating
Environment
This equipment is designed for indoor installation only.
Sheltered locations such as attics, garages, etc., generally
will not provide sufcient protection against extremes in
temperature and/or humidity, and equipment performance,
reliability, and service life may be adversely affected.
Power Supply
A voltage variation of +/-10% of nameplate voltage is
acceptable. Three-phase system imbalance shall not exceed
2%.
Additional Information for Initial
Start-Up Only
Standard Range Units:
Units are designed to start in an ambient of 50ºF (10ºC),
with entering air at 50ºF (10ºC), with entering water at 70ºF
(21ºC), with both air and water at the ow rates used in the
ISO 13256-1 rating test, for initial start-up in winter.
Note: This is not a normal or continuous operating
condition. It is assumed that such a start-up is for the
purpose of bringing the building space up to occupancy
temperature.
Table 12: Water - °C (SI units)
Standard Range Geothermal Range
Units Units
Cooling
Min. Entering... Water
Normal Entering Water29ºC 21ºC 25ºC 4ºC
Max Entering Water43ºC 32ºC 43ºC 32ºC
1At ARI ow rate
Maximum and minimum values may not be combined. If one value is
2
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 conditions, but not more than two, with all other
conditions being normal conditions.
1,2
13ºC 13ºC -1ºC -6ºC
Heating Cooling Heating
Geothermal Range Units:
Geothermal range heat pump conditioners are designed
to start in an ambient of 40ºF (5ºC), with entering air at
40ºF (5ºC), with entering water at 40ºF (5ºC), with both air
and water at the ow rates used in the ISO 13256-1 rating
test, for initial start-up in winter.
Note: This is not a normal or continuous operating
condition. It is assumed that such a start-up is for the
purpose of bringing the building space up to occupancy
temperature.
Catalog 1112-2 McQuay Large Horizontal Water Source Heat Pumps Page 23 of 42
Correction Factors
Table 13: Airow Correction Factors
55
Total Cooling Capacity
Sensible Cooling CapacitykW - CoolingTotal Heat of Rejection
Total Heating Capacity
kW - Heating
Total Heat of Absorption
0.935
0.779
0.925
0.931
0.912
1.025
0.908
60 65 70 75 80 85 90 95 100
0.942
0.803
0.933
0.939
0.921
1.022
0.918
0.948
0.828
0.942
0.946
0.931
1.019
0.928
0.955
0.852
0.950
0.954
0.940
1.017
0.938
Percent of Nominal Airow
0.962
0.877
0.959
0.961
0.950
1.014
0.948
0.969
0.901
0.967
0.969
0.960
1.011
0.958
0.976
0.926
0.976
0.976
0.969
1.009
0.968
0.983
0.950
0.984
0.984
0.979
1.006
0.978
0.990
0.975
0.993
0.991
0.988
1.003
0.988
1.000
1.000
1.000
1.000
1.000
1.000
1.000
105
Total Cooling Capacity
Sensible Cooling CapacitykW - CoolingTotal Heat of Rejection
Total Heating Capacity
kW - Heating
Total Heat of Absorption
155
Total Cooling Capacity
Sensible Cooling CapacitykW - CoolingTotal Heat of Rejection
Available as re rated construction in 2 or 3 foot (610
mm or 914 mm) lengths. Fire rated hoses have a synthetic
polymer core with an outer rated covering of stainless
steel. Fittings are steel. Assembly is “re rated” and tested
according to UL 94 with a VO rating and ASTM 84. Each
hose has MPT connections. Hoses have a swivel connection
at one end and are available in 1¼" (32 mm) to match the
FPT ttings on the unit.
Figure 28: Supply and Return Water Hoses
Condensate Hose Kit
Available as a long clear plastic hose with the necessary
clamps and a MPT hose tting for connection to the FPT
eld piping.
Figure 29: Condensate Hose Kit
Hose Specifications
Inner Tube: Fire retardant TRP (Thermosplastic Rubber)
tested to UL-94 with V-O rating.
Outer Braid: Stainless steel wire (ANSI 302/304)
Temperature range: 40°F to 200°F
Catalog 1112-2 McQuay Large Horizontal Water Source Heat Pumps Page 29 of 42
Accessories
Combination Balancing and Shutoff (Ball)
Valves
Constructed of brass and rated at 400 psig (2758 kPa)
maximum working pressure. Valves have a built-in adjust-
able memory stop to eliminate rebalancing. Valves have
FPT connections on both ends for connection to the water
hose and to the eld piping.
Figure 30: Shutoff Ball Valve
Motorized Valve
Used in variable pumping type applications, the valve
actuator is wired and typically piped in the return water
line. On a call for heating or cooling, the valve will open
prior to the compressor starting. The 24VAC valve actuator
must be wired directly to terminal block H8 on the
MicroTech III controller. The valve is rated for 300
psig (2070 kPa).
Multiple Unit Control Panel (MUCP)
Figure 32: Multiple Unit Control Panel and Board
The Multiple Unit Control Panel (MUCP) is an accessory used when up to 3-units are controlled from a single
thermostat. The MUCP must be eld-installed in a remote
location, typically close to the units and convenient for
service access.
A maximum of 2 boards may be used together if up to
6-units must be connected and controlled from a single
thermostat.
Figure 33: Multiple Unit Control Panel Ciruit Board
Figure 31: 2-Way Motorized Valve
Field Installed Controls
The 2-way motorized water valve kit includes the valve
body, actuator and wire harness. The valve will only open
on a call for heating or cooling. The valve is rated for 300
psig (2070 kPa).
A multiple unit control panel allows a single thermostat
to control up to three units in parallel.
The multiple unit control board provides the components necessary to protect the MicroTech III unit controller
from electrical damage that may occur when using standard
off-the-shelf relays.
This version of the board uses VAC relays and should
not be used in combination with any other accessories or
equipment that require VDC connections to the “G”, “W1”,
or “Y1” terminals.
Page 30 of 42 McQuay Large Horizontal Water Source Heat Pumps Catalog 1112-2
Accessories
These easy-to-operate comfort command centers bring
you a complete range of deluxe features. Features that
enable you to match temperature programming to your application, provide added convenience, and help save energy
and money. All packed into an extra rugged, highly reliable
design that will look and perform like new for years to
come.
HP Circuit 1 High Pressure Switch
HP2 Circuit 2 High Pressure Switch
IOEXP I/O Expansion Board / Harness
LED1 LED Annunciator / Harness
LED2 LED Annunciator / Harness
*RAT Return Air Temp Sensor
*LWT Leaving Water Temp Sensor
LP Circuit 1 Low Pressure Switch
LP2 Circuit 2 Low Pressure Switch
SLTS Circuit 1 Suction Line Temp Sensor
SLTS2 Circuit 2 Suction Line Temp Sensor
R1 Fan Motor Starter
RV Circuit 1 Reversing Valve Solenoid
RV2 Circuit 2 Reversing Valve Solenoid
TB1 Power Terminal Block
X1 75 VA Transformer
*DAT Discharge Air Temp Sensor
*EWT Entering Water Temp Sensor
Notes:
1. “Run/Prg” Jumper to be in “Run” position
for normal operation
* Optional with Communication Module
Page 36 of 42 McQuay Large Horizontal Water Source Heat Pumps Catalog 1112-2
Engineering Specications – Model CCH, CCW
General
Contractor shall furnish and install Water Source Heat Pumps as indicated on plans. Each unit shall be CETL Listed. Units
less than 135,000 Btu/hr. total cooling capacity shall be ISO rated per Standard 13256-1. Each unit shall be fully run tested at
the factory. Each unit shall be shipped on a wooden skid and covered with plastic.
Casing and Cabinet
The casing shall be constructed of heavy-gauge G-60 galvanized steel corner posts and steel panel construction with heavy
gauge steel base pan. The base pan shall have holes to accept eld installation of rubber or spring isolators. The interior shall
be lined with 1/2" thick, 1½ lb. density glass ber. Multiple panels on front, back and sides shall provide access to compressor,
control box, fan motor and fan assembly. Unit shall have a galvanized steel painted drain pan with a drain connection extending
through the unit casing. Insulated drain pan shall act as a divider panel between the compressor and fan sections. Units shall have
as standard a factory installed 2" thick lter brackets for side lter removal. Unit shall have multiple 2" thick throwaway lters.
Cabinets shall have knockouts for entrance of line voltage and low voltage control wiring. Supply return water and condensate
connections shall be copper FPT ttings and protrude through the casing.
R-410A Refrigerant Circuit
Units shall be dual circuit design containing scroll compressors, electronic expansion valve, water-to-refrigerant braze
plate heat exchanger, reversing valve, nned tube heat exchanger (air coil), and safety controls. Non-ozone depleting R-410A
refrigerant must be used.
Compressor(s) shall be scroll type with thermal overload protection and external rubber vibration isolation mounts. Air coil
shall be aluminum ns bonded to copper tubes. The braze plate heat exchanger shall be stainless steel plates with copper braz-
ing with a U.L. Listing and a 400 psig water side rating and a 450 psig refrigerant side rating. High and low side service valves
shall be provided on each refrigerant circuit for measuring and charging of the refrigerant circuit.
Safety controls shall include a low suction temperature (freezestat), high refrigerant pressure and low refrigerant pressure
switches. Units shall be capable of being reset only by interrupting the power supply to the unit and not from the wall thermostat.
Unit shall be capable of starting in an ambient of 40º F with entering water at 55º F standard range, 20º F extended range, with
both air and water ow rates at the ISO rating conditions.
Electrical
A control enclosure shall be located within the unit and shall contain controls for compressor(s), reversing valves(s) and
fan motor operation. A terminal block shall facilitate main power wiring connection. A 75 VA transformer shall supply the low
voltage control circuit.
Unit shall be nameplated to accept time delay fuses for branch overcurrent protection of the power conductors.
Unit control system shall provide one or two stage cooling and heating as required by the setpoints of the wall thermostat.
The unit shall be capable of providing an output signal to a unit-mounted LED annunciator to indicate a “fault” condition.
The control system shall be microprocessor based and provide the following:
■ Stand-alone operation
■ LonWorks communication capabilities (Must be LonMArk 3.4 certied)
■ BACnet communication capabilities (BACnet MS/TP Network)
Catalog 1112-2 McQuay Large Horizontal Water Source Heat Pumps Page 37 of 42
Engineering Specications – Model CCH, CCW
Fan and Motor Assembly
Units shall have a belt driven centrifugal fan. The fan housing shall protrude through the cabinet to facilitate eld duct con-
nection.
Solid-State Control System
MicroTech III Control System - Unit shall have a microprocessor- based control system. The unit control logic shall pro-
vide heating and cooling operation as required by the wall thermostat set point. The control system shall provide the following
for stand-alone operation:
1. The use of standard non-programmable or programmable wall thermostats.
2. Fan operation simultaneous with the compressor (fan interlock) regardless of thermostat logic.
3. Time delay compressor operation.
4. Delayed de-energizing of the reversing valve for quiet reversing valve operation.
5. Compressor short cycle protection of a minimum of three minutes before restart is possible.
6. Random unit start-up after coming off on unoccupied mode.
7. Single grounded wire connection for activation of the unoccupied or unit shutdown modes.
8. Night setback temperature setpoint input signal from the wall thermostat.
9. Override signal from wall thermostat to override unoccupied mode for 2 hours.
10. Brownout protection to suspend unit operation if the supply voltage drops below 80% of normal.
11. Condensate overow protection to suspend cooling operation in an event of a full drain pan.
12. Suspended compressor operation upon activation of the refrigerant pressure switch(es).
13. Cooling operation activated for 60 seconds upon activation of the low suction temperature sensor -
defrost cycle.
14. Method of defeating compressor, reversing valve and fan time delays for fast service diagnostics.
15. Remote reset - Provides means to remotely reset automatic lock-outs generated by high/low pressure faults and/or
low temperature faults.
16. Fault Retry clears faults the 1st two times they occur within a 24-hour period and triggers automatic lock-out on
3rd fault.
MicroTech® III Control with I/O Expansion Module – I/O Expansion Module connects directly to the main MicroTech
III controller to provide control of the second refrigeration circuit.
MicroTech® III Control with LonWorks® Communication Module – Unit shall have a microprocessor-based control
system. The unit control logic shall communicate over a LonMark communications network. The unit controller is factory
programmed [LonMark ® 3.4 certied Application Code the current standard for new applications] and tested with all the logic
required to monitor and control heating and cooling operation. The controller sets the unit mode of operation, monitors water
and air temperatures, and can communicate fault conditions via a LonMark communications network. Units with the MicroTech III and LonWorks communication module include return air, discharge air and leaving water temperature sensors. Space
temperature sensor options include a set-point adjustment, tenant override button, and the capability of substituting the return
air sensor with a wall-mounted room sensor.
Microtech III Control w/ BACnet® Communication Module – Unit shall have a microprocessor-based control system.
The unit control logic shall communicate over a BACnet communications network. The BACnet communication module shall
incorporate an Atmel ARM7 Thumb series MCU and be capable of supporting a full MSTP BACnet implementation. The
microprocessor shall also support SPI compatible communications with the MCU of the Microtech III controller. The physi-
cal interface to a BACnet BAS network shall be through an industry standard RS-485 transceiver capable of existing on an
RS-485 network of up to 64 nodes. The unit controller is factory programmed and tested with all the logic required to monitor
and control heating and cooling operation. The controller sets the unit mode of operation, monitors water and air temperatures,
and can communicate fault conditions via a BACnet communications network. Units outtted with Microtech III and BACnet
Communication modules include return air, discharge air and leaving water temperature sensors. Space temperature sensor
options include a set-point adjustment, tenant override button, and the capability of substituting the return air sensor with a
wall-mounted room temperature sensor.
Page 38 of 42 McQuay Large Horizontal Water Source Heat Pumps Catalog 1112-2
Engineering Specications – Model CCH, CCW
Each communicating unit controller performs the following unit operations:
■ Enable heating and cooling to maintain space temperature set point at the room sensor
■ Enable fan and compressor operation
■ Monitor all safety controls
■ Monitor discharge and return air temperature
■ Monitor leaving water temperature
■ Relay status of all vital unit functions
■ Support optional control outputs
Unit mounted LED annunciators aid in diagnosing unit operation by indicating the water source heat pump operating mode
and alarm conditions. If there are no current alarm conditions, a green LED on the annunciator board will indicate normal unit
operating mode. If an alarm condition exists, the Microtech III controller will send the fault condition to the LED annunciator,
which will assist in troubleshooting the unit. LED Annunciator shall be visible without removing access panel. Heat pumps
with the MicroTech III Controller with a LonWorks Communication Module is designed to be linked with a centralized Build-
ing Automation System (BAS) through a LonMark communications network for centralized scheduling and management of
multiple heat pumps.
Wall-mounted room sensors are available to control the heating and cooling operation of each MicroTech III Water Source
Heat Pump.
Available room sensors include:
■ Room Sensor with timed override button and LED;
■ Room temperature sensor with timed-override button and set point adjustment (55 to 95 deg F);
■ Room sensor with timed-override button and set point adjustment (-3 to +3 deg F);
■ Room sensor (no options, sensor only).
Warranty
An optional 4-year extended compressor warranty covers the compressor for 5 years from the date at which the unit ships
from the factory.
An optional 4-year extended refrigeration circuit warranty covers the entire refrigeration circuit and related components for
5 years.
Field Installed Accessories
Wall Thermostat Options
■ Programmable Electronic Thermostat Two-stage heat/Two-stage cool, 7-day programmable. Subbase shall have
system "Mode/Prog" and fan "Auto/On" switches. Thermostat shall have the option of an Optional Remote Sensor.
■ Non-programmable, auto or manual changeover Two-stage heat/Two-stage cool, night setback override. Subbase
shall have system "Cool/Off/Heat/Auto" and fan "Auto/On switches. Thermostat shall have the option of an Optional
Remote Sensor.
Wall Temperature Sensor Options:
■ Wall Sensor with timed-override button.
■ Wall Sensor with timed-override button and set point adjustment (55 to 95 deg F), fan mode switch (auto/on), opera-
tional mode button (Heat/Cool/Auto) and status LED to display fault condition.
■ Wall Sensor with timed-override button and set point adjustment (-3 to +3 deg F), fan mode switch (auto/on), opera-
tional mode button (Heat/Cool/Auto) and status LED to display fault condition.
Hose Kits:
Two re-rated exible hoses with ASTM ratings of Flame Spread 25, Fuel Contribution 25 and Smoke Density 50 for con-
nection to unit and eld piping. Hose shall be covered with stainless steel braiding to prevent damage.
Valve Options:
■ Combination water balancing and shutoff valve with adjustable memory stop.
■ Optional 2-way, Normally Open (N.O.) or Normally Closed (N.C.) motorized water valves.
Catalog 1112-2 McQuay Large Horizontal Water Source Heat Pumps Page 39 of 42
McQuay Water Source Heat Pumps
Quality Products, Flexible Congurations
Stacking Units
3/4 to 3 Ton
Large Vertical Units
6 to 25 Ton
Large Horizontal Units
6 to 10 Ton
Console Units 3/4 to 11/2 Ton
Rooftop Units 3 to 35 Ton
Water to Water Source Heat
Pump Units
3 to 35 Ton
Ennity Vertical &
Horizontal Units
1/2 to 6 Ton
Warranty
All McQuay equipment is sold pursuant to its standard terms and conditions of sale, including Limited Product Warranty. Consult your local McQuay Representative for warranty details. Refer to Form
933-43285Y. To find your local McQuay Representative, go to www.mcquay.com.
This document contains the most current product information as of this printing. For the most up-to-date
product information, please go to www.mcquay.com.
Products Manufactured in an ISO Certified Facility.