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, Open
Choices, and MicroTech III from McQuay International.
Catalog 1104-2McQuay Ennity Console Water Source Heat Pumps3
Page 4
Introduction
Ennity™ Water Source Heat Pumps
More than 30 years ago, McQuay designed the rst
complete line of water source heat pumps for high efcien-
cy, individually-zoned comfort control in ofces, schools,
assisted living facilities, manufacturing facilities and other
commercial buildings. Our reputation for outstanding reli-
ability and quiet operation has been reinforced in thousands
of successful installations.
Ennity water source heat pumps incorporate the best of
our past and the best of what’s new. Using feedback from
building owners, consulting engineers, contractors and ser-
vice engineers, we designed Ennity products to give you
maximum exibility to design, install, operate and maintain
the ideal water source heat pump system for your building
project. And we incorporated non-ozone depleting R-410A
refrigerant, which–along with high Energy Efciency Ra-
tios (EER’s)–helps preserve our environment and precious
energy resources.
Factory-installed, unit-mounted thermostats save time
and money versus installing wall-mounted thermostats.
Wide range of factory-installed options, including elec-
tric heat, motorized valves and thermostat options help
you meet more specic application requirements with
minimum design or installation time and expense.
Easy, Low-Cost Maintenance
Easy access to the unit compressor (end panel), fan
section and coil (front panel) and unit controls (left or
right end panel).
A easily removable blower motor allows the tangen-
tial fan wheel to remain in the housing during motor
replacement.
A hinged control box allows easy access to the piping
compartment.
With Ennity Water Source Heat Pumps,
you benet from:
High efciency that minimizes environmental impact
and lowers operating costs
Units exceed ASHRAE Standard 90.1 minimum
requirements
Standard range or geothermal application exibility
Engineered For Flexibility and Performance
Two cabinet sizes, each with McQuay’s subtle
aesthetic and small footprint design, make it easy to
meet the space requirements of your new construction
or replacement application.
MicroTech® unit controller with Open Choices™ fea-
ture allows easy, low cost integration with the Building
Automation System (BAS) of your choice.
Improved Efciency
35% greater efciency than the
minimum required by ASHRAE
90.1, for units less than 17,000 Btuh
per ISO Standard 13256-1 for
Boiler/Tower applications.
Quiet Operation
New Gentleo™ fan wheel allows the fan motor to
operate at lower speed for quieter operation.
High efciency rotary compressor mounted on a mass
plate system reduces noise due to vibration.
Superior Indoor Air Quality (IAQ)
Removable, non-corrosive and double-sloped polymer
1. Cabinets – Selectable at top or slope top cabinet
congurations with multiple grille options, including user
congurable, multi-directional grilles. Individual panels-
top,
front and end panels are designed for easy removal and
provides easy access to unit components for service and
maintenance. Optional extended cabinet end pocket for high
sill units, providing 11" of additional area inside the left or
right end pocket for piping or a eld-installed pump.
2
. Compressor - High efciency rotary type, using R-410A re-
f
rigerant with zero ozone depletion potential or phase-out date.
3. Gentleo™ Fan – User
selectable, multi-speed tangential fan
system provides high efciency and very quiet operation
suitable
for noise sensitive applications.
4.LED Annunciator – LED
status lights display fault conditions
to provide easy troubleshooting and diagnosis. Accessed by
removing the left or right end panel to the control enclosure.
5. Filter
– Units come standard with a 1/2" (12.7mm) thick
disposable lter that is easy to access and replace without
removing
panels.
6. Hinged Control Box– Provides added accessibility to
plumbing
end compartment for easier access for service.
7. 2-Way Motorized Valve Packages (Option) – Factory installed
or eld-installed for variable pumping applications. Other
valve options available upon request.
8. MicroTech® III Unit Controller – Designed for exibility, the
main control board is used in standalone applications. An
optional I/O expansion module can be used to control
electric
heat and multiple fan speeds. A separate optional-
L
onWorks® or BACnet® communication module can be
easily snapped onto the board to accommodate the building
automation system of your choice.
9. Double-Sloped Drain Pan
polymer
, promotes positive condensate drainage for superior
– Made of durable, non-corrosive
Indoor Air Quality (IAQ). Drain Pan is easy to remove for
cleaning.
Air Dampers (Field-installed Accessory) – Motorized or manually
operated
outside air dampers provide ventilation air.
Expanded Paint Colors – Color selections that compliment any
decor.
Cupola White Off White Antique Ivory
Putty Beige
Soft Gray Oxford Brown
MicroTech III Controller
I/O Expansion Module
L
onWorks
Module
BACnet
Module
(Discharge Grille
& Subbase)
Multi-Directional Grilles
Extended
(High Sill Units Only)
Provides 11" of additional area inside the
left or right end pocket.
Cabinet End Pocket
Catalog 1104-2McQuay Ennity Console Water Source Heat Pumps5
Page 6
Console Design Features
Conguration
Console water source heat pumps are available in ve
cooling capacity sizes, from 1⁄2 through 1½ tons, (1757 to 5274
watts). Each is available in four different congurations.
Flat top units meet the traditional requirements for a rugged
unit. Slope top units offer a more modern look. The high
silhouette unit is 25" (635mm) high and the low silhouette unit
is only 22½" (572mm) high. The overall unit dimensions are
very compact; unit sizes 007 through 012 are 46" (1168mm)
long and sizes 015 through 018 are 54" (1372mm) long. All
units are a constant 10¾" (273mm) deep for minimum oor
space and a consistent “look” for all unit sizes.
All units incorporate a slide-out chassis concept which
allows it to be installed easily or removed and replaced quickly
when service is required to minimize downtime for the space
the unit serves. The cabinet is made up of individual panels,
each of which can be easily removed to expose the chassis for
eld hook-up of water and electrical connections. The chassis
easily slides off the subbase for service or changeout.
Cabinet
All cabinets are painted with optional Antique Ivory
or Cupola White baked enamel nish for an aesthetically
pleasing appearance that matches room decor. The discharge
grilles and subbase can be Oxford Brown or match the
cabinetry on at top or slope top units.
The shallow 22° slope top cabinet is constructed of 18-
gauge steel. The top and side corners and grille are constructed
of tough, impact-resistant ABS polycarbonate. The grille
extends to the front and sides for a smooth look as well as
providing a curtain stop in back. The discharge grilles can be
rotated to direct the air in an 11° angle from the vertical and
can be reversed for a 33° discharge angle. The control door has
a nger slot and simply lifts up for access to the thermostat.
Overall, the slope top unit allows minimal airow interference
from curtains and objects resting on the cabinet, while at the
same time providing a rugged, aesthetically pleasing look.
The flat top cabinet is constructed of 18-gauge steel
with grille options that meet basic needs with its rugged
construction and its 11° discharge angle.
Chassis
The chassis houses the fan section, refrigerant circuit and
controls. The air enters through the bottom of the chassis,
through the subbase or through the front panel in low sill
units.
The refrigeration system includes a rotary compressor,
reversing valve, coaxial heat exchanger, capillary tubes, air
coil, high and low side access valves, and safety controls.
Access to the compressor is through a removable end panel.
The compressor is isolated from the unit with external vibration
mounts, mass plate/viscoelastic dampening material and the
compartment is totally insulated to make the quietest console
unit on the market. Safety controls include low temperature
(freezestat) and refrigerant high pressure switches. The
control box is hinged for easy access to all of the controls.
The MicroTech III unit controller offers both standalone or
communicating (LonWorksor BACnet) control options.
Each uses a printed circuit board for clean wiring and a
low voltage control circuit with a 50 VA transformer. See
“Controls” section for more detailed information. Main power
is made to a chassis-mounted 2" x 4" (51mm x 102mm)
junction box.
The fan section employs McQuay's Gentleo tangential
system fan and efcient, two-speed PSC motor for selectable
airow and/or noise level. Access to the fan wheel is made
through the top panel. The motor is secured to the chassis
with three screws for easy service.
Water piping connections are 1⁄2" FPT ttings which
terminate in the outward position in the piping compartment
for easy access. Unique left- and right-hand piping (includes
condensate and electrical) locations are available. The 3⁄4"
(19mm) I.D. exible clear vinyl condensate drain tube is
internally trapped and extends 14" (356mm) into the piping
compartment for easy connection. Piping (electrical and
condensate also) can enter through the back wall or through
the oor within the subbase. The chassis allows for a piping
compartment between the chassis and the cabinet.
Optional Factory Installed Features
Boilerless system electric heat eliminates the need for a
boiler in the heat pump water loop. An electric heater is added
to the discharge side of the fan scroll. If the entering water
temperature falls to 58°F (15°C) the thermostat locks out
compressor operation. On a call for heat, the electric heater
is energized. When the entering water temperature raises,
the unit will resume compressor operation on a call for heat.
An emergency electric heat override plug allows for electric
heat, if the compressor (mechanical) heat should fail. Each
unit has various heater sizes to select from. Not available on
115 volt units. Not CSA listed.
Optional Extended End Pockets (High Sill Units)
Optional extended cabinet end pocket for high sill units,
provides 11" of additional area inside the left or right end
pocket for piping or a eld-installed pump.
Optional Multi-Directional Grilles
Selectable plastic Multi-Directional Grilles can rotate
90, 180 or 270 degrees for added control of discharge air
Control Options – Control Choices And Added Functionality
The control box is accessible through the left or right end
corner panel. It houses the major operating electrical controls
including the MicroTech® III unit controller, transformer,
compressor relay and fan relay. Each component is easily
accessed for service or replacement.
Four unique control choices are offered with the Micro-
Tech III unit controller:
■ Standalone operation using a MicroTech III unit controller
■ MicroTech III unit controller with I/O Expansion module
■ MicroTech III unit controller with a Lonworks® commu-
nication module
■ MicroTech III unit controller with a BACnet® communica-
tion 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 50 VA transformer.
Control Description Application Protocol
MicroTech III
(Standalone)
Unit Controller
The MicroTech III unit controller is
a standalone microprocessor-based
control board conveniently located
in the unit control box for accessibil
. The board is designed to provide
ity
standalone control of a Water Source
Heat Pump using a wall thermostat
r a wall mounted temperature sen-
o
s
or. Each unit controller is factory
programmed, wired, and tested. For
added functionality an optional I/O
expansion
MicroTech III controller for complete
control
water source heat pump.
module interconnects to the
and operation of your McQuay
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- mounted
or wall-mounted
thermostat
I/O Expansion
Module
LonWorks
Communication
Module
BACnet
Communication
Module
The I/O Expansion Module is an extension of the Microtech III unit controller
and
provides additional functionality.
It is required on all units with an LED
annunciator
the boilerless electric heat feature.
The MicroTech III unit controller can
a
ccept a plug-in LonWorks communication module to provide network
communications and added functional
to easily integrate with an existing
ity
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 unit controller
can
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
and provides operation of
accept a plug-in BACnet commu-
control the unit.
Allows
for:
• Monitoring of entering water temperature for
boilerless electric heat control.
• Outputs for optional electric heat
.
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 com
munications
-
management of multiple heat pumps.
network for centralized scheduling and
onWorks com-
U
nit-m ounted
or wall-mounted
thermostat
onMark 3.4
L
BaCnet
-
7McQuay Ennity Console Water Source Heat Pumps Catalog 1104-2
Page 8
Control Features – MicroTech® III Unit Controller
The MicroTech III Unit 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 pro-
vides all the necessary eld connections. The board can be
wired for 24-volt AC output to the wall thermostat by using
terminals R & C. An LED annunciator is located on the front
corner of the unit chassis to quickly check the operating status
of the unit.
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, the compressor
and fan will start 0 to 30 seconds later. When the load is
satised, the compressor and fan shut off.
■ Heating Mode – On a call for heating, the reversing valve
is energized after 60 seconds and the compressor and fan
start. When the load is satised, the compressor and fan
shut off. The reversing valve is de-energized 60 seconds
later.
■ Short Cycle Protection & Random Start – Each time
the compressor stops, a new random compressor start-
delay time between 180 and 240 seconds is generated.
This prevents compressor short cycling and prevents units
from starting simultaneously after coming back from an
unoccupied cycle.
■ 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.
■ Override Mode – A switch on the deluxe automatic
changeover thermostat can be activated during the unoccupied 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 200 units.
■ Brownout Protection – The MicroTech III unit controller
measures the input voltage and will suspend compressor
and fan operation if the voltage falls below 80% of the
unit nameplate rated value. A unique LED status is generated and an output is available to a “fault” LED at the
thermostat.
■ 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 and an
output signal is made available for connection to a “fault”
LED at the thermostat.
■ Condensate Overow Protection – The MicroTech III
unit 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 and output
is available to a “fault” LED at the thermostat. Heating
operation is not suspended.
■ Remote Reset of Automatic Lockouts – The Remote Re-
set feature provides the means to remotely reset automatic
lockouts generated by high-pressure and/or low-tempera-
ture faults. When the MicroTech III unit 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
unit controller receives separate input signals from the
refrigerant high-pressure switch and the low suction line
temperature sensor. In a high-pressure situation, compres-
sor 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 and output is available to a “fault”
LED at the thermostat if either situation exists.
Note: Most unit fault conditions are the result of operating
the equipment outside the unit specications.
MicroTech III unit controller LED & fault outputs
Mode / Fault
Occupied, Bypass,
Standby
Override
Unoccupied On On Off Energized
Condensate Overow On Off Off De-energized
High Pressure 1 Fault
Low Pressure 1 Fault Off Off On De-energized
Low Temperature 1 Fault Flash Off Off De-energized
Brownout
Emergency Shutdown
Room/Return
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.
Adding an I/O Expansion Module (with an interconnect
cable) to the unit controller allows the operation of
boilerless electric heat with the Console Water Source Heat
Pump.
Features
Standard Heat Pumps / Single Circuit Units
• Monitors entering water temperature for
boilerless electric heat control
Catalog 1104-2McQuay Ennity Console Water Source Heat Pumps9
Page 10
Control Features – MicroTech III with Communication Module
MicroTech
orksor BACnet CommunicationModule
W
Each McQuay Console 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 Automation System (BAS).
The BACnet module is designed to communicate over a
BACnet MS/TP communications network 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 Console
Water Source Heat Pump. The MicroTech III unit 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 L
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.
®
III Unit Controller with Lon-
onWorks Communication Module
MicroTech III Unit Controller with Communication Modules
Features
The MicroTech III Unit 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 unit 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
Room sensor with LED status and tenant override
button
Room temperature sensor with LED status, timed-
MicroTech III BACnet Communication Module
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.
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 420,000 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 building. 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 towers 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 re-
quirements 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.
Open Loop Well Application
Boiler/Tower Application
Catalog 1104-2McQuay Ennity Console Water Source Heat Pumps11
Page 12
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.
Vertical Loop Application
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 drain-
age 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.
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
Locate a Console 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.
To reduce noise emissions, install a eld-provided 1/4
inch thick, rubber isolator pad below the entire base of the
unit. The pad should be equal to the overall foot-print size
of the unit to provide sound dampening of the unit while
in operation. The unit must sit at on the oor to prevent
unwanted noise and vibration.
Condensate Drain
The factory provided condensate drain trap on the
console unit is located inside the end cabinet. Condensate
removal piping must be 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.
McQuay has available optional re-rated exible hoses
to better facilitate supply and return piping connections.
These exible hoses reduce vibration between the unit and
the rigid piping system.
Fire Rated Supply or Return Hoses
Piping
The console water source heat pump 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 acts as a sound
attenuator for both the unit operating noise and hydronic
pumping noise. One end of the hose has a swivel tting to
facilitate removal of the unit for replacement 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.
Catalog 1104-2McQuay Ennity Console Water Source Heat Pumps13
@ 70° to 90° Radius
24" 400 psig 1200 psig 2½"
Hose Type
1/2" MPT
12"
Supply
& Return
Fixed End, MPT
Nominal
9"
18"
Max. Recommended
Length
Working Pressure
400 psig 1200 psig 2½"
400 psig 1200 psig 2½"
400 psig 1200 psig 2½"
Assembled Length
Minimum Minimum
Burst Pressure Bend
Female Swivel
Adapter
Page 14
Applications – Systems
Typical Cooling and Heating Refrigeration Cycles
Note: For standard heat pump operation only
Cooling Refrigeration Cycle
When the wall thermostat calls
for COOLING, the reversing valve
directs the ow of the refrigerant, a
hot gas, from the compressor to the
water-to-refrigerant 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. 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 pressure gas through the reversing valve and back to the suction side
of the compressor to complete the
cycle.
Heating Refrigeration Cycle
When the wall thermostat calls
for HEATING, the reversing valve
directs the ow of the refrigerant, a
hot gas, from the compressor to the
air-to-refrigerant heat exchanger coil.
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. 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.
Achieving optimal performance with water source heat
pump systems requires both accurate system design and
proper equipment selection. Use a building load program to
determine the heating and cooling loads of each zone prior
to making equipment selections. With this information,
the McQuay SelectTools™ software selection program for
Water Source Heat Pumps can be used to provide fast, ac-
curate and complete selections of all McQuay water source
heat pump products. SelectTools software is available by
contacting your local McQuay Representative.
While we recommend that you use McQuay SelectTools
software for all unit selections, manual selections can be
accomplished using the same zone load information and the
capacity tables available in this catalog.
Boiler / Tower Application Manual Selections:
The following example illustrates a typical selection for
a zone in a boiler/tower system for a commercial building.
A building load program determines that this zone needs
10,430 BTUH of total cooling, 6,950 BTUH of sensible
cooling and 9,150 BTUH of total heating. The water tem-
peratures for the boiler/tower system are 90ºF for cooling
and 70ºF for heating. The return air temperature is 80ºF dry
bulb with 67ºF wet bulb for cooling and 70ºF for heating.
Zone Requirements:
Total Cooling Load = 10,430 BTUH
Sensible Cooling Load = 6,950 BTUH
Total Heating Load = 9,150 BTUH
Air Flow Required = 275 CFM
Return Air Cooling = 80ºFDB/ 67ºFWB
Return Air - Heating = 70ºFDB
Since a McQuay Model MHC 009 produces approxi-
mately 10,000 BTUH of cooling, it is not sufcient for
this zone and a model MHC 012 should be considered.
Model MHC is chosen because it is specically designed
for a boiler/tower application. Typical water ow rates for
boiler/tower applications are 2.0 to 2.5 GPM per ton and in
this example no antifreeze is used.
Selection:
Model .............................MHC 012 (Boiler / Tower model)
Total Cooling Capacity @ 90 EWT = 11,511 BTUH
Sensible cooling capacity @ 90 EWT = 7,660 BTUH
Total Heating Capacity @ 70 EWT = 14,160 BTUH
CFM = 275
Water Flow required to meet capacity = 8 GPM
Water Pressure drop = 2.5 (FT. H2O)
Final Selection ....................................................MHC 012
Geothermal Applications:
The following example illustrates the same zone in a
geothermal application.
The load requirements for the zone are the same as the
above example – 10,430 BTUH of total cooling and 6,950
BTUH of sensible cooling and 9,150 BTUH of heating.
Geothermal loop software programs are available to help
determine the size of the loop eld based on:
Desired entering water temperatures for the system.
Specic acreage available for the loop which produces
specic min./max loop temps for the unit selection.
Entering water temperatures for geothermal systems can
be as high as 90º to 100ºF and as low as 30ºF based on the
geographical location of the building. Water ow rates are
typically 2.5 to 3 GPM per ton and the use of antifreeze is
required in most northern applications.
Zone Requirements:
Total Cooling Load = 10,430 BTUH
Sensible Cooling Load = 6,950 BTUH
Total Heating Load = 9,150 BTUH
Air Flow Required = 275 CFM
Return Air Cooling = 80 DB / 67 WB
Return Air - Heating = 70 DB
A McQuay Model MHW is chosen for this geothermal
application. Model MHW offers insulated water piping for
condensation considerations and a different freezestat setting to allow entering water temperatures lower than 40ºF
(with antifreeze). Output capacities should be recalculated
using the antifreeze reduction tables that are shown on page
34. The Model MHW 012 is rst considered but may not
meet the heating load because of the reduced entering water
temperatures (35ºF) and an antifreeze solution of 21 %
propylene (see page 39).
Selection:
Model ..................................MHC 012 (Geothermal model)
Total cooling capacity @ 100 EWT = 10,555 BTUH x
.980 = 10,344
Sensible cooling capacity @ 100 EWT = 7,257 BTUH x
.980 = 7,112
Total heating capacity @ 35 EWT = 9,430 BTUH x .975 =
9,240 Btuh
CFM = 284
Water Flow required to meet capacity = 2.4 GPM
Water Pressure drop = 2.5 x 1.5 = 3.75 (FT. H2O)
Final Selection ....................................................MHC 012
Note:
In applications where the zone may be a corner ofce or have
excessive glass area, the heating load could be greater than the
heating output capacity of the MHC 012 model (say 7,800 BTUH).
The choices are to upsize the unit to the next model available (015).
15McQuay Ennity Console Water Source Heat Pumps Catalog 1104-2
16 McQuay Ennity Console Water Source Heat Pumps Catalog 1104-2
Page 17
Cooling Capacity Data – Console Unit Size 007
EWT
GPM
1.0
1.
100
5
2.0
1.0
110
1.5
2.0
Capacity Tables Notes:
EWT = Entering Water Temperature (°F) WPD = Water Pressure Drop (Ft. Hd) EA = Entering Air Temperature (°F)
LWT = Leaving Water Temperature (°F) TOT = Total Heat (Btu) SEN = Sensible Heat (Btu) kW = Kilowatts
COP = Coefcient of Performance THA = Total Heat of Absorption (Btu) THR = Total Heat of Rejection (Btu) GPM = Gallons Per Minute
18 McQuay Ennity Console Water Source Heat Pumps Catalog 1104-2
Page 19
Heating Capacity Data – Console Unit Size 007
EWT
GPM
1.0
1.
90
5
2.0
Capacity Tables Notes:
= Entering Water Temperature (°F) WPD = Water Pressure Drop (Ft. Hd) EA = Entering Air Temperature (°F)
EWT
LWT = Leaving Water Temperature (°F) TOT = Total Heat (Btu) SEN = Sensible Heat (Btu) kW = Kilowatts
COP = Coefcient of Performance THA = Total Heat of Absorption (Btu) THR = Total Heat of Rejection (Btu) GPM = Gallons Per Minute
20 McQuay Ennity Console Water Source Heat Pumps Catalog 1104-2
Page 21
Cooling Capacity Data – Console Unit Size 009
EWT
GPM
1.1
100
1.8
2
.5
1.1
110
Capacity Tables Notes:
EWT = Entering Water Temperature (°F) WPD = Water Pressure Drop (Ft. Hd) EA = Entering Air Temperature (°F)
LWT = Leaving Water Temperature (°F) TOT = Total Heat (Btu) SEN = Sensible Heat (Btu) kW = Kilowatts
COP = Coefcient of Performance THA = Total Heat of Absorption (Btu) THR = Total Heat of Rejection (Btu) GPM = Gallons Per Minute
22 McQuay Ennity Console Water Source Heat Pumps Catalog 1104-2
Page 23
Heating Capacity Data – Console Unit Size 009
EWT
GPM
1.1
90
Capacity Tables Notes:
EWT
LWT = Leaving Water Temperature (°F) TOT = Total Heat (Btu) SEN = Sensible Heat (Btu) kW = Kilowatts
COP = Coefcient of Performance THA = Total Heat of Absorption (Btu) THR = Total Heat of Rejection (Btu) GPM = Gallons Per Minute
Performance data based on 208/1ph power supply.
1.8
2
.5
= Entering Water Temperature (°F) WPD = Water Pressure Drop (Ft. Hd) EA = Entering Air Temperature (°F)
24 McQuay Ennity Console Water Source Heat Pumps Catalog 1104-2
Page 25
Cooling Capacity Data – Console Unit Size 012
EWT
100
GPM
1.
2.4
6
3.2
1.6
110
2.4
3.2
Capacity Tables Notes:
EWT = Entering Water Temperature (°F) WPD = Water Pressure Drop (Ft. Hd) EA = Entering Air Temperature (°F)
LWT = Leaving Water Temperature (°F) TOT = Total Heat (Btu) SEN = Sensible Heat (Btu) kW = Kilowatts
COP = Coefcient of Performance THA = Total Heat of Absorption (Btu) THR = Total Heat of Rejection (Btu) GPM = Gallons Per Minute
26 McQuay Ennity Console Water Source Heat Pumps Catalog 1104-2
Page 27
Heating Capacity Data – Console Unit Size 012
EWT
GPM
1.6
90
2.4
3.2
Capacity Tables Notes:
= Entering Water Temperature (°F) WPD = Water Pressure Drop (Ft. Hd) EA = Entering Air Temperature (°F)
EWT
LWT = Leaving Water Temperature (°F) TOT = Total Heat (Btu) SEN = Sensible Heat (Btu) kW = Kilowatts
COP = Coefcient of Performance THA = Total Heat of Absorption (Btu) THR = Total Heat of Rejection (Btu) GPM = Gallons Per Minute
28 McQuay Ennity Console Water Source Heat Pumps Catalog 1104-2
Page 29
Cooling Capacity Data – Console Unit Size 015
EWT
GPM
2.0
100
3.0
4.0
2.0
110
3.0
4.0
Capacity Tables Notes:
EWT = Entering Water Temperature (°F) WPD = Water Pressure Drop (Ft. Hd) EA = Entering Air Temperature (°F)
LWT = Leaving Water Temperature (°F) TOT = Total Heat (Btu) SEN = Sensible Heat (Btu) kW = Kilowatts
COP = Coefcient of Performance THA = Total Heat of Absorption (Btu) THR = Total Heat of Rejection (Btu) GPM = Gallons Per Minute
30 McQuay Ennity Console Water Source Heat Pumps Catalog 1104-2
Page 31
Heating Capacity Data – Console Unit Size 015
EWT
GPM
2.0
90
3.0
4.0
Capacity Tables Notes:
= Entering Water Temperature (°F) WPD = Water Pressure Drop (Ft. Hd) EA = Entering Air Temperature (°F)
EWT
LWT = Leaving Water Temperature (°F) TOT = Total Heat (Btu) SEN = Sensible Heat (Btu) kW = Kilowatts
COP = Coefcient of Performance THA = Total Heat of Absorption (Btu) THR = Total Heat of Rejection (Btu) GPM = Gallons Per Minute
32 McQuay Ennity Console Water Source Heat Pumps Catalog 1104-2
Page 33
Cooling Capacity Data – Console Unit Size 018
EWT
100
GPM
2
.4
3.6
4.8
2
.4
110
3.6
4.8
Capacity Tables Notes:
EWT = Entering Water Temperature (°F) WPD = Water Pressure Drop (Ft. Hd) EA = Entering Air Temperature (°F)
LWT = Leaving Water Temperature (°F) TOT = Total Heat (Btu) SEN = Sensible Heat (Btu) kW = Kilowatts
COP = Coefcient of Performance THA = Total Heat of Absorption (Btu) THR = Total Heat of Rejection (Btu) GPM = Gallons Per Minute
34 McQuay Ennity Console Water Source Heat Pumps Catalog 1104-2
Page 35
Heating Capacity Data – Console Unit Size 018
EWT
GPM
2.4
90
3.6
4.8
Capacity Tables Notes:
= Entering Water Temperature (°F) WPD = Water Pressure Drop (Ft. Hd) EA = Entering Air Temperature (°F)
EWT
LWT = Leaving Water Temperature (°F) TOT = Total Heat (Btu) SEN = Sensible Heat (Btu) kW = Kilowatts
COP = Coefcient of Performance THA = Total Heat of Absorption (Btu) THR = Total Heat of Rejection (Btu) GPM = Gallons Per Minute
Catalog 1104-2McQuay Ennity Console Water Source Heat Pumps37
Page 38
Performance Data
Fan Performance
Airow Vs. CFM - Standard Static Motor
Unit Fan
Size
Speed
007
009
012
High
015
Low
018
Cooling Heating
SCFM L/s SCFM L/s
Low
High
Low
258 122 264 124
High
347 164 355 167
Low
243 115 256 121
275 130 300 142
340 160 376 177
Low
High
559 265 619 292
380 179 392 185
421 199 450 212
High
103 224 106
218
273
129 294 139
Operating Limits
Air Limits - °F (English units)
Standard Range Geothermal RangeUnits Units
Cooling Heating Cooling Heating
Min. Ambient Air 50ºF 50ºF 40ºF 40ºF
Normal Ambient Air 80ºF
Max Ambient Air 100ºF
Min. Entering Air
Normal Entering Air db/wb 80/67ºF
Max Entering Air db/wb
1,2
58ºF 50ºF 58ºF 40ºF
1,2
100/83ºF 80ºF 100/83ºF 80ºF
Air Limits - °C (SI units)
Standard Range Geothermal Range
Units Units
Cooling Heating Cooling Heating
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
14ºC 10ºC 14ºC 5ºC
1,2
38/28ºC 27ºC 38/28ºC 27ºC
Water - °F (English units)
Standard Range Geothermal Range
Units Units
Cooling Heating Cooling Heating
Min. Entering Water
Normal Entering Water 85ºF 70ºF 77ºF 40ºF
Max Entering Water
1,2
55ºF 55ºF 30ºF 20ºF
1,2
110ºF 86ºF 110ºF 86ºF
70ºF 80ºF 70ºF
85ºF 100ºF 85ºF
70ºF 80/67ºF 70ºF
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.
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.
Water - °C (SI units)
Standard Range Geothermal Range
Units Units
Cooling Heating Cooling Heating
Min. Entering... Water
Normal Entering Water29ºC
Max Entering Water
1 At ARI ow rate
2 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 conditions, but not more than two, with all other
Catalog 1104-2McQuay Ennity Console Water Source Heat Pumps43
2¾" 4¼" 1" 1¾" 10¼" 13/5" 5¼" 7½" 10¾"
Page 44
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.
Thermostats and Wall Sensors
Easy-to-operate comfort command centers provide a
complete range of deluxe features.
Non-Programmable, Auto Changeover, Fan Speed
Control, Hardwired
• Single Stage Heat Pump/Non-Heat Pump Systems
• Backlit Display
• Single Stage Heat/Cool Systems
• Field Calibration
• Auto Changeover
• Button Lockout Function
• Two Speed Fan Control
• Remote Temperature Sensor Capability
• Title 24 Compliant / No Batteries Required
• Relay Outputs (minimum voltage drop in thermostat)
• Ideally Suited for:
– Residential (New Construction/Replacement)
– Light Commercial
Catalog 1104-2McQuay Ennity Console Water Source Heat Pumps45
Page 46
Accessories
Specifications–668811001
Electrical rating: • 24 VAC (18-30 VAC)
• 1 amp maximum per terminal
• 3 amp maximum total load
Temperature control range: 45°F to 90°F (7°C to
32°C) Accuracy: ± 1°F (± 0.5°C)
System congurations:
1-stage heat, 1-stage cool,
heat pump
Timing:
Anti-short Cycle: 5 minutes
Backlight Operation: 10 seconds
Terminations: C, RH, RC, W, Y, B, O G1, G2, S1, S2
detailed installation, operation and application
For
refer to Operation & Application Guide LIAF016
MicroTech III Water Source Heat Pump
Room Temperature Sensors
(Kit P/N 669529101, 669529201, 669529001)
Room temperature sensors provide electronic sensing of
room temperatures at wall locations. All sensor models
feature a thermistor (10kΩ), a green LED for unit
status and tenant override button. Setpoint adjustment
potentiometer, heat and fan mode switches are optional
features.
669529001
enant Override
T
Button
SPT
Status LED
Fan and
Mode Switches
Notes:
1
55º to 95°F (13º to 35ºC)
2
-3º to +3ºF (-1.5º to +1.5ºC)
Feature
Adj. Pot No Yes Yes
Yes Yes Yes
Sensor Part Numbers
669529101 669529201
Yes Yes Yes
No
1
Yes
Room Temperature Sensor User Interface
3.75"
Status LED
(Green)
4.59"
Mode Control
Slide Switch
Tenant Override
Momentary Push Button Switch
2
Yes
0 to 10 K ohm
Potentiometer
Fan Control
Slide Switch
Sensor 669529101
Sensor 669529201 Not Shown
• Set Point Adjustment
• LED
• Override feature
The fast, easy solution for temperature sensing problems.
Optional Water Source Heat Pump Room
Temperature Sensors Wiring
Part No.s 669529101, 669529201
Temperature
Sensor Terminals
MicroTech III Unit
Controller TB1 Terminals
Part No. 669529001
Wireless Temperature Control (T9000)
The T9000 Wireless Temperature Control is designed to
provide precision temperature control without the installation labor and expense of wiring.
• Powered by AA batteries
• Mounts in any suitable location that will provide good
temperature control.
• Large LCD display provides the user with current room
temperature, set point temperature, time, program interval,
and other system status information.
For detailed installation, operation refer to Operation &
Maintenance Bulletin OM 897.
Programmable Non-programmable
Temperature
Sensor Terminals
MicroTech III Unit
Controller TB1 Terminals
The second part of the T9000 system is called a Remote
Control Node or “RCN”. An RCN interfaces with specic
desired HVAC equipment, and communicates with its ther-
mostat using unlicensed 900 MHz, radio frequency energy.
the time of installation, the T9000 thermostat is linked
At
to one or more RCN controls. The thermostat and RCN that
have been linked will not interfere with, or be affected by,
any other thermostat or RCN in adjacent rooms, apart-
ments, or neighboring homes.
Remote Control Node (RCN)
Used with the Wireless Temperature Control, the RCN
interfaces with specic HVAC equipment, and communicates with its thermostat using unlicensed 900 MHz, radio
frequency energy. Contact your local McQuay Representa-
tive for details.
Catalog 1104-2McQuay Ennity Console Water Source Heat Pumps47
Page 48
Accessories
Supply and Return Water Hoses
Available as re rated construction in lengths of 9", 12"
or 24". 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 con-
nections. Fire rated hoses have a swivel connection at one
end. Hoses are available in 3/4" (19 mm) to match the FPT
ttings on the unit.
Supply and Return Water Hoses
A motorized valve relay and control valve assembly in-
cludes a relay, valve and wire harness. The valve opens
when the compressor is turned on and closes when the
compressor is off. The valve is rated for 300 psig (2070
kPa).
A multiple unit control panel allows a single wall-mounted
thermostat to control up to three units in a common
space.
An auxiliary relay controls optional devices when the fan
is operating. The relay has SPDT contacts.
Piping Packages
Piping packages can be ordered as a factory installed
option. Motorized valves can be ordered as a eld-installed
accessory.
Typical Left Hand Piping Package Congurations
Combination Balancing and Shutoff Valves
Constructed of brass and rated at 400 psig (2758 kPa)
maximum working pressure. Valves have a built-in adjustable memory stop to eliminate rebalancing. Valves have
FPT connections on both ends for connection to the water
hose and to the eld piping.
Shut off Ball Valve
2-Way Motorized Valve
Used for variable pumping applications, the valve is
wired in the compressor circuit and piped in the return
water line from the unit.
2-Way Motorized Valve
= Field-Installed
1. Measureow Device
2. 2-Way Motorized Isolation Valve
3. Air Bleed Vent
4. Supply, Return and Bypass Hand Valve
5. Inlet-Outlet Flexible Hoses (Field-installed)
Note: On left-hand piping units the water supply
connection is on the top. Right hand piping units
the water supply is at the bottom location.
Manually operated or Motorized outside air damper as-
semblies are available to order as eld-installed accessories
and provide ventilation air.
Manual Outdoor Air Damper
Seal
Manual Outside
Damper Assembly
Motorized Outdoor Air Damper
Seal
Subbase
Multiple Unit Control Panel (MUCP)
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. Console units must have the MUCP eld-installed in a remote location, typically close to the units and
convenient for service access.
Note: The MUCP control board does not t inside
the console unit control box.
A maximum of 2 boards may be used together if up to
6-units must be connected and controlled from a single
thermostat.
Motorized Outside
Damper Assembly
Subbase
Extended End Pocket (Option)
Optional extended cabinet end pocket for high sill units,
provides 11" of additional area inside the left or right end
pocket for piping or a eld-installed pump.
Note: Multi-speed operation is only available with
the optional unit-mounted fan speed switch.
Multiple Unit Control Panel Ciruit Board
The multiple unit control board provides the compo-
nents 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.
Catalog 1104-2McQuay Ennity Console Water Source Heat Pumps49
Page 50
Typical Wiring Diagrams
MicroTech III Unit Controller for Sizes 007-015 – 208/230/60Hz/1-Phase
Drawing No. 669539003A
Legend
Item Description
C1 Capacitor-Compressor
C2 Capacitor-Fan
UMT Unit-Mounted Thermostat
CM Compressor - Motor
COS Condensate Overow Sensor
DPG Drain Pan Ground
FSR Fan Speed Relay
HP High Pressure Switch
SLTS Suction Line Temp Sensor
OVL Compressor Overload Protector
RV Reversing Valve Solenoid
T1 EG2UPC Terminal Strip
X1 Transformer
LED1 LED Annunciator / Harness
able B
T
208V RED
230V ORG
Notes:
Transformer:
Unused wire to be capped.
2. Unit wired for 208V, see Table “B”
Note: Wiring diagrams are typical. For the latest
drawing version refer to the wiring diagram located on
the inside of the controls access panel of the unit.
50 McQuay Ennity Console Water Source Heat Pumps Catalog 1104-1
Page 51
Typical Wiring Diagrams
MicroTech III Unit Controller With Electric Heat for Size 018
208/230/60Hz/1-Phase
Drawing No. 669539006A
Legend
Item Description
C1 Capacitor-Compressor
C2 Capacitor-Fan
CC Compressor Contactor
CM Compressor - Motor
COS Condensate Overow Sensor
DPG Drain Pan Ground
FSR Fan Speed Relay
HP High Pressure Switch
R2 Relay - Electric Heat
IOEXP I/O Expansion Board / Harness
LED2 LED Annunciator / Harness
SLTS Suction Line Temp Sensor
OVL Compressor Overload Protector
RV Reversing Valve Solenoid
T1 EG2UCP Terminal Strip
X1 Transformer
LED1 LED Annunciator / Harness
FHS Fan High Speed Relay
UMT Unit-Mounted Thermostat
EWT Entering Water Temp Sensor
able B
T
208V RED
230V ORG
Notes:
Transformer:
Unused wire to be capped.
2. Unit wired for 208V, see Table “B”
3. I/O Expansion board jumper JP4 shorted.
Note: Wiring diagrams are typical. For the latest
drawing version refer to the wiring diagram located on
the inside of the controls access panel of the unit.
Catalog 1104-1McQuay Ennity Console Water Source Heat Pumps51
Page 52
Typical Wiring Diagrams
MicroTech III Unit Controller with Communication Module and Wall-Mounted Room
Temperature Sensor
265/277/60Hz/1-Phase
Legend
Drawing No. 669542001
Item Description
C1 Capacitor-Compressor
C2 Capacitor-Fan
R1 Relay - Fan Motor
CM Compressor - Motor
COS Condensate Overow Sensor
DPG Drain Pan Ground
FSR Fan Speed Relay
PTB Power Terminal Block
HP High Pressure Switch
SLTS Suction Line Temp Sensor
OVL Compressor Overload Protector
RV Reversing Valve Solenoid
T1 EG2UCP Terminal Strip
X1 Transformer
LED1 LED Annunciator / Harness
CR Compressor Relay
LWT Leaving Water Temperature Sensor
DAT Discharge Air Temperature Sensor
When the optional wall-mounted room temperature sensor is connected to the unit controller, the Return Air
Temperature (RAT) sensor must not be installed. The wallmounted room temperature sensor and return air sensor
must not be connected simultaneously or the unit will not
operate properly.
CAUTION
Note: Wiring diagrams are typical. For the latest drawing
version refer to the wiring diagram located on the inside
of the controls access panel of the unit.
52 McQuay Ennity Console Water Source Heat Pumps Catalog 1104-1
Page 53
Engineering Guide Specications
General
Contractor shall furnish and install Water Source Heat Pump units as indicated on plans. Each unit shall be listed in the ARI
directory of certied products, ISO rated and CETL or CE listed. Each unit shall be fully run tested at the factory. Each unit shall
ship in its own corrugated box. The unit shall consist of a subbase for oor mounting, a cabinet front, a left and right end corner
panel and a slide-out chassis for attachment to the back wall and oor mounting on the subbase. The chassis shall include the
refrigeration system, fan assembly and all controls.
The unit shall be capable of being shipped as a (choose one):
complete unit including subbase, cabinet front, left and right end corner panels and chassis.
□
chassis only for spare unit or future installation.
□
Cabinet and Chassis
The cabinet shall be fabricated from 18 or 20-gauge steel and include multiple holes/slots for attachment to the wall and
oor. The cabinet sections shall be nished in Antique Ivory or Cupola White baked enamel. The subbase shall be nished in
Oxford
Brown or to match the cabinet color. The cabinet shall be insulated. The chassis shall house the refrigeration system,
water piping, fan assembly and all controls. Panels shall provide access to the fan compartment and the compressor/control box
compartment. The lter shall be a 1/2" (25mm) throwaway type with front removal from the subbase.
The chassis shall be fully insulated and incorporate a non-corrosive condensate pan. The drain hose shall have a formed
condensate trap.
The cabinet shall be 10¾" (273mm) maximum depth and shall (choose one):
have a 22° slope top angle and an opening in the subbase for return air with a maximum height of 25" (635mm).
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have a at top and an opening in the subbase for return air with a maximum height of 25" (635mm).
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(Choose one:)
The slope top cabinet shall incorporate an optional, adjustable discharge grille and thermostat cover with ush mounting
□
to the front and sides of the cabinet. The discharge grille shall direct the air at an 11° angle from the vertical and be
eld reversible for a 33° discharge angle. The grille shall be constructed of painted steel or optional, re retardant ABS
polycarbonate or anodized aluminum bar grille. The left and right cabinet corners shall be Antique Ivory or Cupola
White and be constructed of polycarbonate to match the discharge grilles and control door.
The at top unit shall (choose one):
incorporate a one-piece stamped, painted steel grille. The grille shall be painted Oxford Brown or match the cabinet
□
color.
incorporate no cabinet and a duct collar on the chassis for installation into a eld supplied custom cabinet enclosure.
□
Refrigerant Circuit
Each unit shall have a sealed refrigerant circuit including a compressor, capillary expansion tube(s), nned tube heat exchanger,
reversing valve, water-to-refrigerant coaxial heat exchanger, high and low side access valves, and safety controls.
Compressor shall be rotary type with external vibration mounts and thermal overload protection. The nned tube coil shall
be constructed of aluminum ns bonded to copper tubes. The coaxial heat exchanger shall be constructed of a copper inner tube
and a steel outer tube and be U.L. listed. The heat exchanger shall be rated for 400 psig (2759 kPa) on the water side and 450
psig (3104 kPa) on the refrigerant side.
Safety controls shall include a low suction temperature (freezestat) switch and a high refrigerant pressure switch to lock out
compressor operation. Unit shall be capable of being reset only by interrupting the power supply to the unit. Manual reset of the
safety switch at the unit shall not be allowed. Unit shall be capable of starting at entering air of 40°F (5°C) and entering water
at 70°F (21°C) with both air and water ow rates at the ARI rating conditions.
Electrical
A control box with removable top cover shall be located on the right or left side of the chassis and shall contain controls for
compressor, reversing valve and fan motor operation and a 50 VA transformer. The chassis shall have a 2" x 4" (51mm x mm)
junction box mounted on the side to facilitate main power wiring and be capable of being located on the left or right side of the
chassis. Unit shall be nameplated to accept time delay fuses or HACR circuit breaker for branch overcurrent protection of the
power source.
Catalog 1104-2McQuay Ennity Console Water Source Heat Pumps53
Page 54
Engineering Guide Specications
Fan and Motor Assembly
Unit shall have a direct-drive tangential fan wheel. The fan housing shall be insulated with closed-cell insulation to help
attenuate noise. The motor shall be thermally protected, two-speed, PSC type and be connected to the chassis. The motor shall
have a plug connection and be connected to the chassis with three screws for easy removal and service.
Piping
The supply and return lines shall be 5/8" O.D. copper tubing and terminate away from the side of the chassis. The internally
trapped condensate shall be a 3/4" (19mm) I.D. clear exible vinyl tube protruding 14" (356mm) out of the chassis for connection
at the oor or at the back wall. The supply, return and condensate tubing shall be capable of terminating at the left or right side
Unit shall have a microprocessor based control system and provide random start, compressor short cycle protection, grounded
signal input (one each) for activation of unoccupied or emergency shutdown modes, LED fault status, optimal two-hour override
of the unoccupied mode, brownout protection, condensate overow protection, remote reset of automatic lockouts, fault retry
to minimize nuisance trips, defrost cycle and pump restart relay output.
wall-mounted sensor.
□
wall-mounted sensor w/status LED and night setback
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wall-mounted sensor w/setpoint adjustment
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wall-mounted sensor w/setpoint adjustment
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The control system type shall have an option of, (choose one):
unit-mounted non-programmable w/LCD display, Hi-Lo-auto fan speed control.
□
unit-mounted 7-day programmable w/LCD display, Hi-Lo-auto fan speed control.
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wall-mounted non-programmable w/LCD display, Hi-Lo-auto fan speed control.
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wall-mounted 7-day programmable w/LCD display, Hi-Lo-auto fan speed control.
□
wall-mounted space temperature sensor/setpoint adjustment (55° F to 95°F), auto- On fan speed control.
□
wall-mounted space temperature sensor/setpoint adjustment (-3° F to +3°F), auto- On fan speed control.
□
wall-mounted sensor, no setpoint adjustment.
□
wall-mounted sensor, night setback override button and LED status light.
□
wireless thermostat and receiver, non-programmable, Hi-Lo-auto fan speed control.
□
wireless thermostat and receiver, 7-day programmable, Hi-Lo-auto fan speed control.
□
Optional Boilerless System Electric Heat
Unit shall have a factory mounted electric heater and control system. A unit-mounted entering water temperature thermostat
shall lock out compressor heating operation at 58°F (15°C). On a call for heating, the electric heater shall be activated. When
the entering water temperature rises, the unit shall resume normal compressor heating operation. An emergency heat switch
shall provide heating only from the electric heater in the event of a compressor failure.
Optional Outside Air Damper Kit
The damper is located in the back of the subbase for outside air intake and shall be operated manually from the subbase.
Damper can be congured for manual adjustment or motorized control.
The chassis shall incorporate a plug cord for connection to a unit-mounted receptacle/fused disconnect switch box in the
subbase under the chassis. The plug cord shall electrically mate to the receptacle.
Optional Receptacle/Fused Disconnect Kit
The permanent portion of the cabinet shall have a receptacle and fused disconnect switch to facilitate main power electrical
connection permitting chassis removal without disconnecting main power wiring.
Optional Motorized Valve Package
The return water line shall have a motorized water valve. The valve shall operate in conjunction with compressor operation;
valve opens before compressor is turned on. The valve shall have a maximum rating of 150 psig (1035 kPa).
Field-Installed Accessories
Optional Flexible Hoses
Each unit can be supplied with two steel re-rated hoses for connection to unit and eld piping. Hose assembly shall be
rated at 500 psig (3494 kPa).
Optional Ball Valves
Each unit can be supplied with two combination balancing and shutoff valves with adjustable memory stop.
Optional Filter Kits
12-pk. lter kits available from selection software.
Catalog 1104-2McQuay Ennity Console Water Source Heat Pumps55
Page 56
McQuay Water Source Heat Pumps
Quality Products, Flexible Congurations
Large Vertical Units
6 to 25 Ton
Large Horizontal Units
6 to 10 Ton
Ennity Vertical &
Horizontal Units
1/2 to 6 Ton
1
Console Units 1/2 to 1
Rooftop Units 3 to 35 Ton
/2 Ton
Water to Water Source
Heat Pump Units
3 to 35 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 nd 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 Certied Facility.