McQuay VFC007 User Manual

Enfinity™ Vertical Water Source Heat Pumps Catalog 1103-2

Floor Model VFC & VFW

Unit Sizes 007 – 070 (1/2 to 6 Tons) • R-410A Refrigerant

Engineered for exibility and performance™

Table of Contents

Product Models Nomenclature . .......................................... 3

Introduction ...........................................................................4

Vertical Floor-mounted Design Features & Options ......... 5-9

Vertical Floor-mounted Design Control Options .................10

Vertical Floor-mounted Design Control Features ..........11-14

Microtech III Control System .......................................11

I/O Expansion Module .................................................12

Microtech III with LONWorks Comm. Module .............13

Microtech III with BACnet

Applications - Systems ................................................ 15-17

Heating and Cooling Refrigeration Cycle ....................15

Boiler

Open Loop Well Water Application ..............................16

Closed Loop Geothermal Application ..........................17

Applications Considerations .........................................18-20

T

Unit Location ...............................................................18

Ductwork & Ettenuation ................. ............................ 19

Piping ..........................................................................19

Condensate Drain .......................................................19

Unit Selection ..............................................................20

ISO Performance Data .................................................21-23

W

Ground Loop ...............................................................22

Ground Water ..............................................................23

Capacity Data ............................................................... 24-45

Size 012 (400 cfm) ......................................... 26-27

Size 015 (500 cfm) ......................................... 28-29

Size 019 (600 cfm) ......................................... 30-31

Size 024 (800 cfm) ......................................... 32-33

Size 030 (1000 cfm) ....................................... 34-35

Size 036 (1300 cfm) ....................................... 36-37

Size 042 (1400 cfm) ....................................... 38-39

Size 048 (1600 cfm) ....................................... 40-41

Size 060 (2000 cfm) ....................................... 42-43

Size 070 (2160 cfm) ....................................... 44-45

Performance Data

Operating Limits .........................................................46

Correction Factors

Airow .........................................................................47

Antifreeze ...................................................................47

Electrical Data ..............................................................48-59

Unit without Options ...................................................48

Unit with Desuperheater .............................................49

Unit with ECM .............................................................50

Unit with Desuperheater and ECM .............................51

Unit with 10kW Electric Heat Coil ...............................52

Unit with 5kW Electric Heat Coil .................................53

Unit with ECM and 10kW Electric Heat Coil ...............54

Unit with ECM and 5kW Electric Heat Coil .................55

Unit with Desuperheater and 10kw Elec. Heat Coil....56

Unit with Desuperheater and 5kW Elec. Heat Coil .....57

Unit with Desuperheatert, ECM and 10kW

Electric Heat Coil ........................................................58

Unit with Desuperheater

Electric Heat Coil ........................................................59

Tower Application ..............................................16

ypical Vertical Installation ..........................................18

ater Loop ..................................................................21

Size 009 (300 cfm) ......................................... 24-25

®

Comm. Module..................14

, ECM and 5kW

Fan Performance

PSC Motor CFM - Sizes 007 - 070 .............................60

ECM Motor CFM - Sizes 007 - 070

Physical Data.....................................................................61

Dimensional Data .........................................................62-66

Vertical (Left & Right Hand) Sizes 009, 012 ............... 62

Vertical (Left & Right Hand) Sizes 015, 019, 024 .......63

Vertical (Left & Right Hand) Sizes 030, 036 ...............64

Vertical (Left & Right Hand) Sizes 042, 048 ...............65

Vertical (Left Hand) Sizes 042, 060, 070 ....................66

Field Installed Accessories ...........................................67-69

Programmable Electronic Thermostat Two-Stage

Heat/Two-Stage Cool, 7-Day Programmable .............67

Non-Programmable, Auto or Manual Changeover
Two-Stage Heat/Two Stage Cool, Night Setback

Override.................................................................67-68

MicroTech III Water Source Heat Pump Room

Temperature Sensors .................................................68

Optional Remote Sensor ............................................68

Supply and Return Water Hoses ................................69

Condensate Hose Kit .................................................69

Combination Balancing and Shutoff (Ball) Valves ......69

Optional Two-inch Filter Rack ....................................69

Control Connection Diagrams ...........................................70

Programmable Electronic Thermostat Two-Stage

Heat/Two-Stage Cool, 7-Day Programmable .............70

Non-Programmable, Auto or Manual Changeover

Two Stage Heat/Two Stage Cool, Night Setback and

Override Feature ........................................................70

Optional Remote Sensor Wiring to Thermostat(s) .....70

Optional Water Source Heat Pump Room

Temperature Sensors Wiring ......................................70

Typical Wiring Diagrams ...............................................71-75

MicroTech III Unit Controller (Standalone) –

208/230/460/575/60Hz/3-Phase.................................71

MicroTech III Unit Controller with Optional ECM

Motor, Desuperheater and I/O Expansion Module

– 208/230/265/277/60 Hz/1-Phase.............................72

MicroTech III Unit Controller with Optional ECM Motor,

Desuperheater, Electric Heat Coil and I/O Expansion

Module – 208/230/460/60 Hz/3-Phase .......................73

MicroTech III Unit Controller with Optional ECM

Motor, Desuperheater, and I/O Expansion Module

208/230/460/60/3-Phase ............................................74

MicroTech III Unit Controller with PSC Motor,

Desuperheater and I/O Expansion Module for Hot Gas

Reheat Control (Unit Sizes 019-070) 208/230/60/1-

Phase .........................................................................75

Guide Specications .....................................................76-79

2 McQuay Ennity Water Source Heat Pumps Catalog 1103-2

Model Nomenclature

Vertical Floor Unit (Size *007 - 070)

Note: For illustration purposes only. Not all options available with all models.

Please consult McQuay Sales Representative for specic availability.

W VFC 1 019 B E Y L T
Product Category

W = WSHP

Product Identier

VFC = Floor Mounted/Standard Range
VFW = Floor Mounted/Geothermal

Design Series

1 = A Design
2 = B Design
3 = C Design
4 = D Design

Nominal Capacity

*007 = 7,000 BTU/h

009 = 9,000 BTU/h
012 = 12,000 BTU/h
015 = 15,000 BTU/h
019 = 19,000 BTU/h
024 = 24,000 BTU/h
030 = 30,000 BTU/h
036 = 36,000 BTU/h
042 = 42,000 BTU/h
048 = 48,000 BTU/h
060 = 60,000 BTU/h
070 = 70,000 BTU/h

*Unit size 007 not available at time of publication. Please consult your

local McQuay Representative for specic availability.

Vertical (Floor) Water Source Heat Pumps Sizes *007-070 (1/2 to 6 Tons)

 Model VFC (Standard Range: 55°F to 110°F)
 Model VFW (Geothermal Range: 30°F to 110°F)

Controls

B = MicroTech III Unit Controller

C = MicroTech III Unit Controller w/LonWorks Communication Module

D = MicroTech III Unit Controller w/BACnet Communication Module

Discharge Air

T = Top

Return Air

L = Left
R = Right

Future

(None)

Voltage

A = 115/60/1
E = 208-230/60/1
F = 208-230/60/3
J = 277-265/60/1
K = 460/60/3
L = 575/60/3

“McQuay” is a registered trademark of McQuay International.

©McQuay International 2009. All rights reserved throughout the world.

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 III from McQuay International.

Catalog 1103-2 McQuay Ennity Water Source Heat Pumps 3

Introduction

Ennity

complete line of water source heat pumps for high efcien-

cy, individually-zoned comfort control in ofces, schools,

assisted living facilities, manufacturing facilities and other
commercial buildings. Our reputation for outstanding reli­ability and quiet operation has been reinforced in thousands
of successful installations.

our past and the best of what’s new. Using feedback from
building owners, consulting engineers, contractors and ser-

vice engineers, we designed Ennity 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 Efciency Ra­tios (EER’s)–helps preserve our environment and precious
energy resources.

™

Water Source Heat Pumps

More than 30 years ago, McQuay designed the rst

Ennity water source heat pumps incorporate the best of

With Ennity Water Source Heat Pumps,
you benet from:

High efciency that minimizes environmental impact

and lowers operating costs

 Units exceed ASHRAE Standard 90.1 minimum

requirements

 High efciency standard range or geothermal

application exibility

Easy, low-cost design and installation

 Two congurations for each unit size (left or right

return) allow you to specify units to t space require

ments and to design the system using minimum duct­work and piping.

 Four cabinet sizes, each with McQuay’s small footprint

design, make it easy to meet the space requirements of
your new construction or replacement application.

 Flush FPT water ttings allow easy, one-wrench tight-

ening of hose kits and help reduce delays caused by
shipping damage.

 Open Choices™ controls feature allows easy, low cost

integration with a Building control Automation System
of your choice.

 Factory-installed lter rack saves time and expense to

eld-install a lter rack.

 Factory-installed electric heat, desuperheater and ECM

motor options help you meet more specic application

requirements with minimum design or installation time

and expense.

Easy, low-cost maintenance

 Easy access to the unit compressor (2-sides), fan sec-

tion (1-side), motor (1-side) and unit controls (front

access).

 A removable orice ring allows the blower and motor

to be removed without removing the blower housing or

disconnecting the unit from the ductwork.

Quiet operation

 Large fan wheel allows the fan motor to operate at

lower speed for quieter operation.

 Two quiet compressor selections (depending on volt-

age and size variations) including rotary (sizes 007 to

015), and scroll compressors (sizes 019 to 070).

Superior Indoor Air Quality (IAQ)

 Double-sloped, polymer drain pan promotes positive

condensate drainage.

 Optional closed-cell foam insulation (no glass bers in

air stream).

 Optional Hot Gas Reheat Coil provides superior

humidity control.

R-410A refrigerant with zero ozone depletion potential
or phase-out date

 R-410A is classied as A1/A1 – lower toxicity, no

ame propagation – per ASHRAE Standard 31.

Exceeds ASHRAE 90.1 Minimum Efciencies

4 McQuay Ennity Water Source Heat Pumps Catalog 1103-2

Vertical Floor-mounted Features & Options

I/O Expansion
Module

LED Annunciator

MicroTech III Unit
Controller

L
Communication
Module

BACnet
Communication
Module

onWorks

1. Electric Heat (Optional) – Integral electric heat coil provides

supplemental or emergency heat when conditions require.

2. Electronically Commutated Motor (ECM-Optional) - ECM motor

provides quiet, efcient operation while maintaining constant

over its static operating range. Factory programmed for

CFM
3-speeds.

3

. 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 L

net®

communication module can be easily snapped onto the

onWorks® or BAC-

board to accommodate the building automation system of your
choice.

4. LED Annunciator

– External

LED status lights display fault

conditions to provide easy troubleshooting and diagnosis.

5. Compact Cabinet – The

standard unit is constructed of
unpainted G-60 galvanized steel, with the smallest possible
footprint. Optional painted cabinet is ideal for aesthetic re­quirements

6. Desuperheater (Optional) –

of residential applications.

Saves energy by producing domes­tic hot water using a small heat exchanger and water pump lo­cated

in the compressor compartment. Superheated refrigerant
gas from the compressor, which would otherwise be wasted,
is used to heat water. This reduces the amount of additional
energy required to heat water and it may eliminate the require

for separate water heating equipment.

ment

Desuperheater
Heat Exchanger and
Water Pump Piping Circuit

Optional – Hot Gas Reheat
Piping Circuit

7. Filter & Filter Rack – Units come standard with a 1" (25.4 mm)

thick throwaway lter mounted in a 4-sided combination lter

rack

and return air duct collar. This eliminates the added labor

and cost to eld-mount brackets. Filters can be easily removed

from

any side. A 2" lter rack is available as a factory-installed

selectable option to accept higher efciency lters

8.

Removable Access Panels – Two front panels provide easy

access to the blower motor and unit controls. Two rear panels
provide easy access to the fan housing and compressor section.

9. Piping Connections

– Water connections are FPT water t-

tings, ush with the outside of the cabinet for easy one-wrench

connection

to units. A large condensate connection provides

proper condensate removal.

10. Coaxial Heat Exchanger

– Designed

for maximum heat transfer

at normal and low water ow rates with minimum pressure
drop. The inside tube is deeply uted to enhance heat transfer

and

minimize fouling. A cupro-nickel heat exchanger is avail-

able

as a selectable option.

11. Hot Gas Reheat Coil (Optional) – Provides superior humidity

control by using expelled heat from the refrigeration cycle
and redirecting it through an isolated circuit in the evaporator
section. For every 10°F of temperature rise across the hot gas
reheat coil there is approximately a 20% drop in the discharge
air relative humidity (%Rh). A wall-mounted humidistat is

-

used in conjunction with the unit to measure and adjust the
humidity in the space.

Catalog 1103-2 McQuay Ennity Water Source Heat Pumps 5

Vertical Floor-mounted Features and Options

Flexible Congurations

Top View

Right Hand

Return

Air

Control Box

Cabinet

The Ennity Vertical Water Source Heat Pump is

factory assembled and tested for reliability. Five unique

cabinet sizes make up our 1/2 through 6 ton (1.8 through

21.2 kW) vertical heat pump product line. The consistent
shape makes layout simple. Water, condensate and
duct connections are all in similar locations to simplify
installation.

The fan section is separated from the compressor
section with an insulated divider panel for maximum sound
attenuation. A large removable panel provides easy service
access to the blower and motor.

The cabinet is constructed of unpainted, G-60
galvanized steel. The interiors of the top and side panels

and the bottom of the unit are covered with 1/2" thick

(13 mm), 1
standard. An optional closed cell insulation is available for
applications with more stringent IAQ requirements.

1

/2 lb. (681 g) density coated glass ber as

Cabinet Congurations

For maximum exibility, each vertical unit is available

in either a left-hand or right-hand return air arrangement to
provide the optimum piping location and service access.

The mirror image design of the units lets you congure

the system using minimum ductwork and piping. This helps
reduce design, material and installation costs.

Left Hand

Water

Connections

Filter Rack

The lter is supported by factory-mounted brackets that

allow for face removal. Units come standard with a 1" (25.4

mm) thick throwaway lter mounted in a combination lter
rack and return air duct collar, thus eliminating eld mounted
brackets. The lter can be removed from the right or left

side.

 Optional factory-mounted or eld-installed 2" lter rack

kit for higher ltration requirements.

Optional 2" Filter Rack

Remove lter from
the left or right
side without a tool

Blower Housing

The blower housing protrudes through the cabinet top

allowing adequate material for connection to a exible

duct.

Fan Housing Protrudes Through the Cabinet Top for
Connection of Flexible Duct

6 McQuay Ennity Water Source Heat Pumps Catalog 1103-2

Vertical Floor-mounted Features and Options

Electrical

The electrical components are located in the compressor
section of the unit. Separate holes are provided on the
cabinet to facilitate main power and low voltage control
wiring. All wiring connections are made internal to the
cabinet to reduce the risk of accidental contact. Each
unit is rated to accept time-delay fuses for branch circuit
overcurrent protection. Single phase units are also rated for
use with HACR circuit breakers.

The control box houses the major operating
electrical controls including the MicroTech III unit
controller, transformer, compressor relay and fan relay.
Each component can be accessed easily for service or
replacement.

Easy Access to the Vertical Unit Control Panel

Water Connections

The water and condensate connections are FPT ttings,
securely mounted ush to the corner post to allow for
connection to a exible hose without the use of a back-up

wrench. This helps reduce the time required to connect the
unit and helps prevent delays due to shipping damage. All
vertical units are internally trapped with clear vinyl tubing,
to allow inspection of condensate drain.

Flush FPT Water Fittings

Access panels lift
up and out easily

Vertical Unit Double-Sloped Drain Pan

Double Sloped Channels

Catalog 1103-2 McQuay Ennity Water Source Heat Pumps 7

Vertical Floor-mounted Features and Options

R-410A Refrigerant

 R-410A refrigerant has zero ozone depletion potential,

no scheduled phase-out and is classied in ASHRAE

Standard 31 as A1/A1 – lower toxicity, no ame

propagation.

Compressors

Ennity water source heat pumps are designed around

the most advanced compressors in the industry. A wide
variety of compressor types are used to offer the best
system design for the dedicated refrigerants and tonnage.

This allows Ennity water source heat pumps to deliver

rated capacity with low noise levels.

Rotary compressor with R-410A is used in vertical units
size 007 to 015. R-410A, non-CFC refrigerant is used in
all unit sizes 007 to 070. Unit sizes 019 to 070 use a scroll
compressor.

Scroll Compressor

Rotary Compressor

Thermal Expansion Valve

All Ennity water source heat pump units include a

thermal expansion valve for refrigerant metering. The
Thermal Expansion Valve (TXV) allows the unit to operate

at optimum efciency with uid temperatures ranging from

30ºF to 110ºF, and entering air temperatures ranging from
40ºF to 90ºF. The TXV precisely meters the exact amount

of refrigerant ow through the system to meet the load and

deliver rated heating and cooling capacity.

Thermal Expansion Valve (TXV)

Reversing Valve

A 4-way reversing valve is included with all Enn­ity water source heat pumps. The valve is energized in
the heating mode and will “fail-safe” to the cooling mode
which is the predominant mode of operation for
commercial applications.

4-Way Reversing Valve

Fluid-to-Refrigerant Coil

The copper or cupronickel (optional) tube-in-tube

coaxial heat exchanger used in Ennity water source heat

pumps are designed for maximum heat transfer at normal

and low water ow rates with minimum pressure drop. The
inside tube is deeply uted to enhance heat transfer and

minimize fouling. All coaxial coils are tested to 400 psig on
the water side and 500 psig on the refrigerant side.
Geothermal range (VFW) units include coil and piping in­sulation to protect against condensation in low-temperature
geothermal applications.

Coaxial Heat Exchanger

8 McQuay Ennity Water Source Heat Pumps Catalog 1103-2

Vertical Floor-mounted Features and Options

Noise Reduction

Ennity Water Source Heat Pumps include multiple

features and options to reduce unwanted noise generation
including scroll and rotary compression, viscoelastic acous­tical mass plate, vibration isolated fan mounts, optional
compressor sound blankets and soft starting ECM motors.
While good design and installation practices are always
required to prevent objectionable noise, McQuay, as a
leader in engineered products can also provide many other
customized solutions to meet your applications
requirements.

Schrader Connections

Two Schrader valves are located inside the end access
panel – one on the low side and one on the high side of the
refrigeration circuit – for charging and servicing. All valves

are 7/16" SAE ttings.

Schrader Valve

to lock out compressor operation at extreme conditions.
For additional protection, unit sizes 015 and larger have a
7 psi (48 kPa) low-pressure switch to protect the compres­sor from low refrigerant charge. The low setting prevents
nuisance trips while providing additional protection.

Blower Section

The blower section includes the blower housing, wheel,
motor and drain pan. It is separated from the compressor
section by an insulated divider panel for maximum sound
attenuation. The large size of the blower wheel allows it
to rotate more slowly, reducing motor work to improve

efciency and provide for quiet operation. A large panel

provides service access to the blower and motor. All

blower/motor assemblies have a removable orice ring on

the housing to accommodate motor and blower removal
without disconnecting the unit from the ductwork.

Blower Motors

The standard blower motor is a multi-speed, Permanent
Split Capacitor (PSC) type with thermal overload protec­tion. It is permanently lubricated. The motor is factory

wired to maximize performance and efciency. Unit sizes

019 and larger have a terminal strip on the motor for simple
motor speed change without going back to the control
box. The motor is isolated from the fan housing using
rubber isolators to minimize vibration transmission. All

blower/motor assemblies have a removable orice ring on

the housing to accommodate motor and blower removal
without disconnecting the unit from the ductwork. Optional
Electronically Commutated Motor (ECM) provides soft
start, maintains consistent CFM over its static operating
range and fan speed can be adjusted automatically based on
mode of operation.

High Efciency Blower Motor Options

Air-to-Refrigerant Coil

The air-to-refrigerant heat exchanger is a large face

area coil with copper tubes and aluminum ns. The ns are
lanced and mechanically bonded to the tubes using nned

edges on the inside which expand during assembly to
enhance heat transfer capabilities. The maximum working
pressure of the heat exchanger is 500 psig (3447 kPa). The
coil is designed for optimal performance in both heating

and cooling while maintaining the benet of a compact

size. Coils can be provided with an optional E-coating.

Electronically Commutated
Motor (ECM)

Refrigeration System

Units have a coaxial heat exchanger with a copper inner

tube and a steel outer tube. The air coil is a large face area

coil with copper tubes and aluminum ns. Safety controls

include a high-pressure switch and low-temperature sensor

Catalog 1103-2 McQuay Ennity Water Source Heat Pumps 9

Permanent Split Capacitor
Motor (PSC)

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 Micro­Tech 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® 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 50 VA transformer.

Control Description Application Protocol

Uni t-mounte d
or wall-mounted
thermostat

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
or a wall mounted temperature sen

or. Each unit controller is factory

s
programmed, wired, and tested. For

added functionality an optional I/O

expansion
MicroTech III controller for complete
control and operation of your McQuay
water source heat pump.

module interconnects to the

Each unit controller is factory programmed, wired,
and tested for complete control of single zone, stand­alone

operation of your McQuay Water Source Heat

Pump.

-

-

I/O Expansion

Module

LonWorks

Communication

Module

BACnet

Communication

Module

The I/O Expansion Module is an exten­s

ion of the Microtech III unit controller
and provides additional functionality to
the Microtech III control system. The
interconnect cable from the I/O expan-

module to the MicroTech III unit

sion
controller provides two-stage operation
of the water source heat pump.

The MicroTech III unit controller can
accept a plug-in LonWorks commu­nication 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 unit controller
can accept a plug-in BACnet commu­nication module to provide network
communications and added functional­ity 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.

Allows

for:

• Monitoring of entering water temperature for
boilerless electric heat control.

• Outputs for optional electric heat

• Output for multi-speed fans on a standard water
source heat pump.

• Independent LED annunciator to easily identify
operation fault conditions for two-stage units.

LonTalk application protocol is designed for units
that are integrated into a LonWorks communication
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

Uni t-mounte d
or wall-mounted
thermostat

onMark 3.4

L

BaCnet

-

10 McQuay Ennity Water Source Heat Pumps Catalog 1103-2

Control Features – MicroTech® III Control System

The MicroTech III Unit Controller is a microprocessor­based 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

satised, 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 satised, 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 Overow 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-tempera­ture 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, 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 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 specications.

MicroTech III unit controller LED & fault outputs

Mode / Fault

Occupied, Bypass,
Standby
Override
Unoccupied On On Off Energized
Condensate Overow 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 “Ofine”
Received

1

Compressor relay/compressor terminal is labeled COMP, switched line of

the same electric input as any of the L1 terminals.

Status LED’

, or Tenant Off On Off Energized

Air or Low

1

ellow Green Red Output-Terminal “A”

Y

Off Off Flash De-energized

Off Flash Off De-energized

Off Flash Off De-energized

Flash Flash On De-energized

On On Off De-energized

On On On De-energized

Off Off Off De-energized

s

Thermostat Alarm Light

Catalog 1103-2 McQuay Ennity Water Source Heat Pumps 11

Control Features – I/O Expansion Module

I/O Expansion Module

The I/O Expansion Module is a factory installed option.

It is an extension of the MicroTech III unit controller and
provides extra functionality.

The I/O Expansion Module has 4 main purposes:

 The Microtech III unit controller in combination with

the I/O Expansion Module will be the standard control

system for dual-circuit Water Source Heat Pump
equipment. For example: large vertical units.

 The I/O Expansion Module has outputs to control

electric heat on a standard Water Source Heat Pump.

 The I/O Expansion Module has outputs for multi-speed

fans on a standard Water Source Heat Pump.

 The I/O Expansion Module has an independent LED

annunciator to identify operational fault conditions on
dual-circuit equipment.

I/O Expansion Module Conguration Jumper Settings

Jumper Description Options

JP1 Number of

JP2

Water Reheat Shorted to enable reheat
JP3 and JP4 open for no
supplemental heat
JP3 Supplemental JP3 open, JP4 shorted for
& JP4 Heat Type boilerless electric heat
JP3 and JP4 shorted is an
invalid setting
JP5 and JP6 open for single-speed fan

JP5

& JP6 Selection JP5 shorted and JP6 open for
two-speed fan
JP 5 and JP6 shorted is an
invalid setting

JP7

Speed Type Shorted for two-speed compressor

JP8 Future Spare

Compressors Shorted for dual compressor

Hot Gas/

Fan Speed three-speed fan

JP5 open, JP6 shorted for

Compressor Open for single-speed compressor

Open for single compressor

Open to disable reheat

I/O Expansion Module Conguration Jumper Terminals

I/O Expansion Module LED & Fault Outputs

Invalid Conguration
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

Mode / Fault

Low Suction Temp #2 Fault Flash Off Off De-energized

Sensor Failures Low Suction
Low Suction

1

EWT (w/ Boilerless EH only)

2

Service Test Mode Enabled Flash Flash Flash De-energized

Normal Operation

Y

Temp #2, Flash Flash On De-energized

Off On Off De-energized

Status LED's

ellow Green Red

Flash Flash Off De-energized

Off Flash Flash N/A

Off On Off Energized

Terminal “A”

Thermostat Alarm

Light Output

Note: Mode / Faults are listed in order of priority.

1

Boilerless electric heat only

2

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.

Jumper Terminals

Features

Standard Heat Pumps / Single Circuit Units

 Monitors entering water temperature for boilerless

electric heat control

 Outputs for medium and high speed fan controls.

Second Circuit Units

 High pressure switch
 Low pressure switch
 Low suction line temperature sensor
 Compressor output
 Reversing valve

12 McQuay Ennity Water Source Heat Pumps Catalog 1103-2

Control Features – MicroTech III Controller with LonWorks Module

MicroTech III / unit control board LED & fault outputs

Mode / Fault

Occupied, Bypass,
Standby
Override
Unoccupied On On Off Energized
Condensate Overow On Off Off De-engergized
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 “Ofine”
Received

1

Compressor relay/compressor terminal is labeled COMP, switched line of

the same electric input as any of the L1 terminals.

Status LED’

, or Tenant Off On Off Energized

Air or Low

1

ellow Green Red Output-Terminal “A”

Y

Off Off Flash De-energized

Off Flash Off De-energized

Off Flash Off De-energized

Flash Flash On De-engergized

On On Off De-energized

On On On De-energized

Off Off Off De-enegized

MicroTech III Unit Controller with LonWorks®
Communication Module

Each McQuay water source heat pump can be equipped

with a LonWorks communication module that is LonMark

3.4 certied. The controller is microprocessor-based and is

designed to communicate over a LonWorks communica-

tions network. It can be factory or eld-installed.

The unit controller is programmed and tested with
all the logic required to monitor and control the unit. An
optional wall sensor may be used with the communica­tion module to provide limited local control of the Water
Source Heat Pump. The 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.

s

Thermostat Alarm Light

MicroTech III Unit Controller with LonWorks
Communication Module orchestrates the following unit
operations:

 Enable heating and cooling to maintain setpoint

based on a room sensor



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

The MicroTech III unit controller with communication
module includes:

A unit-mounted return air sensor*




A unit-mounted discharge air sensor*



A leaving water temperature sensor

* Discharge air and return air sensors must be

eld-installed per IM 956.

communication module provides access to

The
setpoints for operational control

Available wall sensors include:
 Room sensor with LED status and tenant override

button

 Room

sensor with LED status, tenant override

button, and ±3°F setpoint adjustment

 Room

sensor with LED status, tenant override

button, 55° to 90°F setpoint adjustment

The MicroTech III unit controller with communica­tion module includes a unit-mounted return air, discharge
air and leaving water temperature sensor. Wall mounted
temperature sensors include setpoint adjustment and tenant
override. The user has the capability of substituting the wall
sensor with a duct-mounted return air sensor.

Catalog 1103-2 McQuay Ennity Water Source Heat Pumps 13

Control Features – MicroTech III Controller with BACnet Module

MicroTech III Controller with BACnet
Communication Module

McQuay water source heat pumps are available with

McQuay BACnet MS/TP communication module that
is designed to communicate over a BACnet MS/TP

communications network to a building automation system

(BAS). It can be factory or eld-installed.

The unit controller is programmed and tested with all the
logic required to monitor and control the unit. An optional
wall sensor may be used with the communication module to
provide limited local control of the water source heat pump.
The 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.

The module makes operational data and commands
available on a communications network using BACnet
objects and properties:

The network cable is a shielded twisted-pair cable



 Network communications run up to 76.8 Kbps



DIP switches on the controller enable the MS/TP MAC

address to be set in the range 0-127

 Four green status LEDs on the communication module

indicate communication activity on the MS/TP com­munication network and with the unit controller

MicroTech III Unit Controller with BACnet MS/TP

Communication Module orchestrates the following
unit operations:

Enable heating and cooling to maintain setpoint



based on a room sensor



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

The MicroTech III unit controller with communication
module includes:

A unit-mounted return air sensor*




A unit-mounted discharge air sensor*



A leaving water temperature sensor

* Discharge air and return air sensors must be

eld-installed per IM 956.

communication module provides access to

The
setpoints for operational control

Available wall sensors include:

Figure 13. MicroTech III BACnet Water Source Heat Pump
Snap-in Communication Module

 Room sensor with LED status and tenant override

button

 Room

sensor with LED status, tenant override

button, and ±3°F setpoint adjustment

 Room

sensor with LED status, tenant override

button, 55° to 90°F setpoint adjustment

14 McQuay Ennity Water Source Heat Pumps Catalog 1103-2

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
valve and back to the suction side of
the compressor to complete the cycle.

gas through the reversing

Air to

Refrigerant

Heat

Exchanger

Coil

Blower

Air to

Refrigerant

Heat

Exchanger

Coil

Blower

Return Air

Conditioned Air

(Cooling)

Return Air

Conditioned Air

(Heating)

Thermal

Expansion Valve

Reversing Valve

Thermal

Expansion Valve

Reversing Valve

Water to Refrigerant

Heat Exchanger

Water In

Water Out

Sensing
Bulb and
Capillary
Tube

Compressor

Water to Refrigerant

Heat Exchanger

Water In

Water Out

Sensing
Bulb and
Capillary
Tube

Compressor

Catalog 1103-2 McQuay Ennity Water Source Heat Pumps 15

Applications – Systems

Water source heat pump systems are one of the most ef-

cient, environmentally friendly systems available for heating
and cooling buildings. High-efciency, 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 specic 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 benets rang-

ing from low cost installation to the highest energy efciency

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 main­tained 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 benet of an open loop system is the constant water
temperature, usually 50ºF to 60ºF, which provides efcient
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 En­vironmental 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

16 McQuay Ennity Water Source Heat Pumps Catalog 1103-2

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 boreeld. 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 specically 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

“Surface Water” or “Lake” closed loop system is a

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 sufcient 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

cost lower than a vertical loop.

Catalog 1103-2 McQuay Ennity Water Source Heat Pumps 17

Applications Considerations

Typical Vertical Installation

Unit Location

The VFC, VFW water source heat pump can be
installed “free standing” in an equipment room; however,
closet installations are more common for the small vertical
type units. Generally, the unit is located in the corner of a
closet with the non-ducted return air facing 90º to the door
and the major access panels facing the door as shown in
the illustration at right. Alternatively, the unit can have a
ducted return air with the opening facing the door and the
major access panels facing 90º to the door.

Locate a vertical 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. 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.

Install a eld supplied line voltage disconnect for

branch circuit protection.

To reduce noise emissions, install a eld-provided 1/2

inch thick, isolator pad below the entire base of the vertical
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.

Typical VFC Installation – Closet, Non-Ducted Return

Typical Closet Installation - Non-ducted Application

Left-Hand Return Air

Arrangement

Return

Air

Return Air Thru

Louvered Door

Risers

A - Condensate
B- Desuperheater Water Return (Optional)
C

- Desuperheater Water Supply (Optional)

D

- Water Return

E

- Water Supply

F

- Low Voltage Control Wiring (Electric Entrance)

Right-Hand Return Air

Arrangement

Return

Air

Return Air Thru
Louvered Door

1. Discharge air

2. Acoustic thermal duct lining - 10 feet

3. Line voltage disconnect

4. Low voltage wiring to unit control box

5. Flexible duct collar

6. Louvered closet door

7. Condensate drain

8. Flexible, braided, stainless steel return hose with ow
controller/ball valve with port

9. Flexible, braided, stainless steel supply hose with Y-

strainer/ball valve with port

10. Access to unit control box

11. LED annunciator lights indicate unit operation status
and faults

12. Full vibration isolation pad between unit and oor

13. Minimum distance between return air duct collar and
wall for non-ducted return applications

• Size 007-012 – 5 inches

• Size 015-024 – 5 inches

• Size 030-036 – 6 inches

• Size 042-048 – 8 inches

• Size 060-070 – 10 inches

18 McQuay Ennity Water Source Heat Pumps Catalog 1103-2

Applications Considerations

Ductwork and Attenuation

All ductwork should conform to industry standards of

good practice as described in ASHRAE Systems Guide.

The discharge duct system will normally consist of a

exible connector at the unit, a non-insulated transition

piece to the full duct size, a short run of duct, an elbow
without vanes, and a trunk duct teeing into a branch circuit
with discharge diffusers as illustrated below.

Return air ducts can be brought in through a wall grille

and then to the unit. The return duct system will normally

consist of a exible connector at the unit and a trunk duct to

the return air grille. With metal duct material, the return air
duct should be internally lined with acoustic insulation for
sound attenuation.

Return air ductwork to the unit requires the optional

return air duct collar/2" (51mm) lter rack kit.

Suggested Discharge Air Ducting

Trunk Duct

Square Elbow
(Both Sides
Internally Lined
With Acoustic
Insulation)

Branch Duct

Flexible

Duct Collar

Duct

Transition

(Internally Lined)

2 ft. x 2 ft. Diffuser

Discharge Collar

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.

Control Access Panel

A - Condensate
B- Desuperheater Water Return (Optional)
C

- Desuperheater Water Supply (Optional)

D

- Water Return

E

- Water Supply

F

- Low Voltage Control Wiring (Electric Entrance)

G

- Line Voltage Unit Power (Electric Entrance)

McQuay has available optional hose kit combinations

to better facilitate system ow balancing. These exible

hoses reduce vibration between the unit and the rigid piping
system.

Fire Rated Supply or Return Hoses

Heat Pump

Piping

The 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

Catalog 1103-2 McQuay Ennity Water Source Heat Pumps 19

Condensate Drain

The factory provided condensate drain trap on the
vertical unit is located inside the 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.

Applications – Unit Selection

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, ac­curate 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

38,255 BTUH of total cooling, 31,832 BTUH of sensible

cooling and 36,988 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 = 38,255 BTUH
Sensible Cooling Load = 31,832 BTUH
Total Heating Load = 36,988 BTUH

Air Flow Required = 1510 CFM

Return Air Cooling = 80ºFDB/ 67ºFWB

Return Air - Heating = 70ºFDB

Since a McQuay Model VFC 036 produces approxi-

mately 36,000 BTUH of cooling, it is not sufcient for

this zone and a model VFC 042 should be considered.

Model VFC is chosen because it is specically 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 .............................VFC 042 (Boiler / Tower model)

Total Cooling Capacity @ 90 EWT = 40,816 BTUH

Sensible cooling capacity @ 90 EWT = 32,704 BTUH
Total Heating Capacity @ 70 EWT = 52,019 BTUH
CFM = 1510 @ .5 ESP (Wet Coil)

Water Flow required to meet capacity = 8 GPM

Water Pressure drop = 6.9 (FT. H2O)

Final Selection ....................................................VFC 042

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 – 38,255 BTUH of total cooling and 31,832
BTUH of sensible cooling and 36,988 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.

 Specic acreage available for the loop which produces

specic 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 = 38,255 BTUH
Sensible Cooling Load = 31,832 BTUH
Total Heating Load = 36,988 BTUH

Air Flow Required = 1510 CFM

Return Air Cooling = 80 DB / 67 WB

Return Air - Heating = 70 DB

A McQuay Model VFW is chosen for this geothermal
application. Model VFW 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

49. The Model VFW 042 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 49).

Selection:

Model ..................................VFW 042 (Geothermal model)

Total cooling capacity @ 100 EWT = 40,434 BTUH x

.980 = 39,625

Sensible cooling capacity @ 100 EWT = 32,164 BTUH x

.980 = 31,520
Total heating capacity @ 35 EWT = 38,335 BTUH x

.975 = 37,377 CFM = 1510 @ .6 ESP (Dry Coil)

Water Flow required to meet capacity = 10.8 GPM

Water Pressure drop = 12.7 x 1.5 = 14.61 (FT. H2O)

Final Selection ....................................................VFW 042

Note:

In applications where the zone may be a corner ofce or have
excessive glass area, the heating load could be greater than the
heating output capacity of the VFW 042 model (say 41,985 BTUH).
The choices are to upsize the unit to the next model available (048),
or add an electric duct heater to supplement the output of the 042
unit.

20 McQuay Ennity Water Source Heat Pumps Catalog 1103-2

Ennity Vertical ISO Performance Data – Water Loop

Water Loop Performance Data – Rated in Accordance with ISO Standard 13256-1 Boiler/Tower

Standard Unit ECM at High Static

*007

009

012

042

* Not available at time of publication. Please consult your McQuay Representative for specific availability
n/a = ECM not available in unit sizes 007, 009, 012.

Unit
Size

015

019

024

030

036

048

060

070

CFM

*

300

400

500

600

800

1000

1300

1400

1600

2000

2160

Airow Waterow

Cooling Heating Cooling Heating

Voltage

L/S GPM L/S Btuh Watts EER COP Btuh Watts COP Btuh Watts EER COP Btuh Watts COP

*

142

189

236

283

378

472

614

661

755

944

1019

*

2.3

3.0

3.6

4.68

5.81

7.25

9.50

11.00

12.00

15.50

19.00

*

0.15

0.19

0.23

0.30

0.37

0.46

0.60

0.69

0.76

0.98

1.20

115-1-60

208/230-1-60

265-1-60
115-1-60

208/230-1-60

265-1-60
115-1-60

208/230-1-60

265-1-60

208/230-1-60

265-1-60

208/230-1-60

265-1-60

208/230-1-60

265-1-60

208/230-1-60

265-1-60
208/230-3-60
208/230-1-60
208/230-3-60

460-3-60
208/230-1-60
208/230-3-60

460-3-60

575-3-60
208/230-1-60
208/230-3-60

265-1-60

460-3-60

575-3-60
208/230-1-60
208/230-3-60

265-1-60

460-3-60

575-3-60
208/230-3-60

460-3-60

575-3-60

*

9060

12000

14700

19200

23800

30000

39500

43900

48100

63200

75400

*

2650

3510

4300

5620

6980

8800

11500

12800

14100

18500

22100

14.0

14.4

16.0

15.2

15.1

17.0

14.8

15.0

14.7

15.1

13.5

n/a

n/a

n/a

16.6

16.3

17.0

15.0

16.2

16.0

15.7

14.0

n/a

n/a

n/a

n/a

n/a

n/a

*

*

*

4.9

18000

4.8

26300

5.0

33400

4.4

44500

4.7

52300

4.7

56400

4.6

67700

4.1

86300

*

*

4.1

10600

4.2

14000

4.7

16100

4.5

18300

4.4

26700

5.0

33400

4.3

45000

4.4

52500

4.3

56800

4.4

68300

4.0

87300

*

4.7

4.8

5.1

4.4

4.9

5.2

4.6

4.8

4.8

4.7

4.4

*

*

3110

4110

4720

5370

7820

9780

13200

15400

16600

20000

25500

n/a

n/a

n/a

*

19500

24100

29900

39900

44200

48700

63600

76200

n/a

n/a

n/a

*

5710

7050

8750

11700

12900

14200

18600

22300

n/a

n/a

n/a

*

5270

7700

9780

13000

15300

16500

19800

25300

n/a

n/a

n/a

*

4.6

5.2

5.4

4.6

5.1

5.1

5.0

4.5

Notes:
EER = Energy Efciency Ratio COP = Coefcient of Performance L/s = Liters per second

Cooling capacity is based on 80.6°F db, 66.2°F wb (27/19°C) entering air temperature and 86°F (30°C) entering water temperature.
Heating capacity is based on 68°F (20°C) entering air temperature and 68°F (20°C) entering water temperature.

Catalog 1103-2 McQuay Ennity Water Source Heat Pumps 21

Ennity Vertical ISO Performance Data – Ground Loop

Ground Loop Performance Data Rated in Accordance with ISO Standard 13256-1 Ground Coupled

Standard Unit ECM at High Static

*007

009

012

* Not available at time of publication. Please consult your McQuay Representative for specific availability
n/a = ECM not available in unit sizes 007, 009, 012.

Unit
Size

015

019

024

030

036

042

048

060

070

CFM

*

300

400

500

600

800

1000

1300

1400

1600

2000

2160

Airow Waterow

Cooling Heating Cooling Heating

Voltage

L/S GPM L/S Btuh Watts EER COP Btuh Watts COP Btuh Watts EER COP Btuh Watts COP

*

142

189

236

283

378

472

614

661

755

944

1019

*

2.3

3.0

3.6

4.68

5.81

7.25

9.50

11.00

12.00

15.50

19.00

*

0.15

0.19

0.23

0.30

0.37

0.46

0.60

0.69

0.76

0.98

1.20

115-1-60

208/230-1-60

265-1-60

115-1-60

208/230-1-60

265-1-60

115-1-60

208/230-1-60

265-1-60

208/230-1-60

265-1-60

208/230-1-60

265-1-60

208/230-1-60

265-1-60

208/230-1-60

265-1-60

208/230-3-60
208/230-1-60
208/230-3-60

460-3-60

208/230-1-60
208/230-3-60

460-3-60

575-3-60

208/230-1-60
208/230-3-60

265-1-60

460-3-60

575-3-60

208/230-1-60
208/230-3-60

265-1-60

460-3-60

575-3-60

208/230-3-60

460-3-60

575-3-60

*

9720

12700

15700

19400

24800

30700

40300

45400

51600

65100

76500

*

2850

3720

4600

5690

7260

9000

11800

13300

15100

19100

22400

*

4.9

5.0

5.7

5.1

5.2

5.6

5.1

5.0

4.6

4.8

4.0

*

*

2050

7020

2720

9300

2920

10000

4010

13700

5210

17800

6530

22300

8900

30300

10300

35100

11800

40300

13700

47000

17200

58900

*

16.7

16.9

19.6

17.3

17.7

19.1

17.3

17.0

15.8

16.3

13.7

*

3.3

3.5

3.5

3.5

3.6

3.9

3.4

3.6

3.4

3.5

3.1

n/a

n/a

n/a

*

19700

25100

30600

40500

46100

50200

66000

78400

n/a

n/a

n/a

*

5770

7350

8960

11800

13500

14700

19300

22900

n/a

n/a

19.0

19.2

19.3

16.6

18.9

18.2

18.0

16.2

n/a

n/a

n/a

n/a

n/a

*

*

5.6

5.6

5.7

4.9

5.5

5.3

5.3

4.7

*

13400

17500

22300

30000

34400

37600

46000

56800

n/a

n/a

n/a

n/a

n/a

*

3920

5120

6530

8790

10100

11000

13500

16600

n/a

n/a

n/a

*

3.7

3.8

4.0

3.3

3.8

3.8

3.8

3.6

Notes:
EER = Energy Efciency Ratio COP = Coefcient of Performance L/S = Liters per second

Cooling capacity is based on 80.6°F db, 66.2°F wb (27/19°C) entering air temperature and 77°F (25°C) entering water temperature.
Heating capacity is based on 68°F (20°C) entering air temperature and 32°F (0°C) entering water temperature.

22 McQuay Ennity Water Source Heat Pumps Catalog 1103-2

Ennity Vertical ISO Performance Data – Ground Water

Ground Water Performance Data Rated in Accordance with ISO Standard 13256-1.

Standard Unit ECM at High Static

*007

009

012

* Not available at time of publication. Please consult your McQuay Representative for specific availability
n/a = ECM not available in unit sizes 007, 009, 012.

Unit
Size

015

019

024

030

036

042

048

060

070

CFM

*

300

400

500

600

800

1000

1300

1400

1600

2000

2160

Airow Waterow

Cooling Heating Cooling Heating

Voltage

L/S GPM L/S Btuh Watts EER COP Btuh Watts COP Btuh Watts EER COP Btuh Watts COP

115-1-60

*

142

189

236

283

378

472

614

661

755

944

1019

*

2.3

3.0

3.6

4.68

5.81

7.25

9.50

11.00

12.00

15.50

19.00

*

0.15

0.19

0.23

0.30

0.37

0.46

0.60

0.69

0.76

0.98

1.20

208/230-1-60

265-1-60
115-1-60

208/230-1-60

265-1-60
115-1-60

208/230-1-60

265-1-60

208/230-1-60

265-1-60

208/230-1-60

265-1-60

208/230-1-60

265-1-60

208/230-1-60

265-1-60
208/230-3-60
208/230-1-60
208/230-3-60

460-3-60
208/230-1-60
208/230-3-60

460-3-60

575-3-60
208/230-1-60
208/230-3-60

265-1-60

460-3-60

575-3-60
208/230-1-60
208/230-3-60

265-1-60

460-3-60

575-3-60
208/230-3-60

460-3-60

575-3-60

*

10900

14100

17100

21400

26600

33000

42900

48800

56100

69000

79100

*

3200

4130

5010

6270

7790

9600

12500

14300

16400

20200

23100

*

8820

*

2580

3450

3830

4950

6360

8320

11000

12500

14300

17100

21300

*

4.0

4.2

4.3

4.1

4.2

4.6

4.1

4.2

4.0

4.1

3.6

*

*

7.0

23.8

7.0

8.2

6.9

6.8

7.4

6.5

6.5

5.9

6.0

4.9

11800

13100

16900

21700

28400

37700

42900

48900

58400

72700

23.8

28.1

23.5

23.3

25.1

22.3

22.1

20.3

20.5

16.6

n/a

n/a

n/a

*

21600

26900

32900

43000

49100

54300

69900

80600

n/a

n/a

n/a

*

6320

7880

9630

12600

14400

15900

20500

23600

n/a

n/a

n/a

n/a

*

26.1

25.8

25.5

21.3

24.8

23.8

22.9

19.6

n/a

n/a

7.7

7.6

7.5

6.2

7.3

7.0

6.7

5.7

n/a

n/a

n/a

*

*

16600

21300

28400

37400

43000

47100

57400

70500

n/a

n/a

n/a

*

4860

6240

8300

10900

12600

13800

16800

20600

n/a

n/a

n/a

*

4.4

4.5

4.8

4.0

4.5

4.5

4.4

4.1

Notes:
EER = Energy Efciency Ratio COP = Coefcient of Performance L/S = Liters per second

Cooling capacity is based on 80.6°F db, 66.2°F wb (27/19°C) entering air temperature and 59°F (15°C) entering water temperature.
Heating capacity is based on 68°F (20°C) entering air temperature and 50°F (10°C) entering water temperature.

Capacity Tables Notes:
EWT = Entering Water Temperature (ºF) L/sec. = Airow in Liters per second WPD = Water Pressure Drop (Ft. Hd) EA = Entering Air Temperature (ºF)
LWT = Leaving Water Temperature (ºF) TOT = Total Heat (Btu) SEN = Sensible Heat (Btu) kW = Kilowatts
COP = Coefcient of Performance THA = Total Heat of Absorption (Btu) THR = Total Heat of Rejection (Btu) GPM = Gallons Per Minute

Catalog 1103-2 McQuay Ennity Water Source Heat Pumps 23

Capacity Data – Vertical Unit Size 009 (300 CFM)

EWT

20

30

40

50

60

70

GPM

1.6

2

.3

3.0

1.6

2.3

3.0

1.6

2.3

3.0

1.6

2.3

3.0

1.6

2.3

3.0

1.6

2.3

3.0

WPD

4

.1

7.4

11.4

4.1

7.4

11.4

4.1

7.4

11.4

4.1

7.4

11.4

4.1

7.4

11.4

4.1

7.4

11.4

EA

n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a

70/59
75/63
80/67
85/71
70/59
75/63
80/67
85/71
70/59
75/63
80/67
85/71
70/59
75/63
80/67
85/71
70/59
75/63
80/67
85/71
70/59
75/63
80/67
85/71
70/59
75/63
80/67
85/71
70/59
75/63
80/67
85/71
70/59
75/63
80/67
85/71
70/59
75/63
80/67
85/71
70/59
75/63
80/67
85/71
70/59
75/63
80/67
85/71
70/59
75/63
80/67
85/71
70/59
75/63
80/67
85/71
70/59
75/63
80/67
85/71

LWT

n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a

44.0

45.0

46.0

47.0

39.8

40.4

41.1

41.9

37.5

38.0

38.5

39.1

53.9

54.9

55.9

57.0

49.7

50.4

51.1

51.8

47.5

48.0

48.5

49.1

63.7

64.7

65.7

66.8

59.6

60.3

61.0

61.7

57.4

57.9

58.4

59.0

73.4

74.3

75.4

76.5

69.4

70.1

70.8

71.5

67.2

67.7

68.3

68.9

83.0

83.9

84.9

86.0

79.1

79.8

80.5

81.3

77.0

77.5

78.1

78.7

Cooling Heating

TOT

n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a

10569
11515
12461
13408
10700
11646
12593
13539
10831
11777
12724
13670
10061
10963
11865
12767
10192
11094
11996
12898
10323
11225
12128
13030

9548
10405
11263
12121

9679
10537
11394
12252

9810
10668
11526
12383

9028

9842
10655
11469

9160

9973
10787
11600

9291
10104
10918
11731

8504

9273
10042
10811

8635

9404
10173
10942

8766

9535
10304
11073

SEN

n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a

7704
7917
8130
8343
7757
7970
8183
8396
7810
8023
8236
8449
7472
7691
7910
8128
7526
7744
7963
8181
7579
7797
8016
8235
7237
7461
7685
7909
7290
7514
7738
7962
7343
7567
7791
8016
6997
7227
7456
7686
7050
7280
7510
7739
7103
7333
7563
7792
6753
6988
7223
7459
6806
7041
7276
7512
6859
7094
7330
7565

kW

n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a

0.208

0.166

0.125

0.084

0.207

0.166

0.125

0.084

0.207

0.166

0.124

0.083

0.313

0.280

0.248

0.215

0.312

0.280

0.247

0.215

0.312

0.279

0.247

0.214

0.406

0.383

0.359

0.335

0.406

0.382

0.358

0.334

0.406

0.382

0.358

0.334

0.489

0.473

0.458

0.443

0.488

0.473

0.458

0.443

0.488

0.473

0.457

0.442

0.559

0.553

0.546

0.540

0.559

0.552

0.546

0.539

0.558

0.552

0.545

0.539

THR

n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a

11240
12065
12889
13714
11308
12133
12957
13782
11376
12200
13025
13850
11120
11937
12755
13573
11187
12005
12823
13640
11255
12073
12891
13708
10938
11748
12559
13370
11005
11816
12627
13438
11073
11884
12695
13506
10694
11498
12302
13106
10762
11566
12370
13174
10830
11634
12438
13242
10390
11187
11984
12781
10458
11255
12052
12849
10525
11323
12120
12917

EA

50
60
70
80
50
60
70
80
50
60
70
80
50
60
70
80
50
60
70
80
50
60
70
80
50
60
70
80
50
60
70
80
50
60
70
80
50
60
70
80
50
60
70
80
50
60
70
80
50
60
70
80
50
60
70
80
50
60
70
80
50
60
70
80
50
60
70
80
50
60
70
80

LWT

14.5

14.8

15.1

15.4

16.2

16.4

16.6

16.8

17.1

17.2

17.4

17.5

23.4

23.7

24.1

24.4

25.4

25.6

25.9

26.1

26.4

26.6

26.8

27.0

32.3

32.7

33.0

33.4

34.5

34.8

35.0

35.3

35.8

36.0

36.2

36.4

41.1

41.5

41.9

42.3

43.7

43.9

44.2

44.5

45.1

45.3

45.5

45.8

49.8

50.2

50.7

51.2

52.7

53.0

53.4

53.7

54.3

54.6

54.8

55.1

58.4

58.9

59.4

59.9

61.7

62.0

62.4

62.8

63.5

63.8

64.1

64.4

TOT

6014
5916
5818
5719
6197
6099
6001
5903
6380
6282
6184
6086
6899
6801
6703
6604
7082
6984
6886
6788
7265
7167
7069
6971
7837
7739
7641
7543
8020
7922
7824
7726
8203
8105
8007
7909
8828
8730
8632
8534
9011
8913
8815
8717
9194
9096
8998
8900
9872
9774
9676
9578

10055

9957
9859

9761
10239
10140
10042

9944
10969
10871
10773
10675
11152
11054
10956
10858
11336
11238
11139
11041

kW

0.453

0.524

0.594

0.665

0.473

0.544

0.614

0.685

0.493

0.564

0.634

0.705

0.458

0.536

0.614

0.691

0.478

0.556

0.633

0.711

0.498

0.576

0.653

0.731

0.461

0.545

0.630

0.715

0.481

0.565

0.650

0.735

0.500

0.585

0.670

0.755

0.460

0.552

0.644

0.736

0.480

0.572

0.664

0.756

0.500

0.592

0.684

0.776

0.458

0.557

0.655

0.754

0.478

0.576

0.675

0.774

0.497

0.596

0.695

0.794

0.452

0.558

0.664

0.770

0.472

0.578

0.684

0.790

0.492

0.598

0.704

0.810

THA

4250
4028
3806
3583
4434
4212
3989
3767
4618
4395
4173
3951
5153
4885
4617
4349
5336
5068
4800
4532
5520
5252
4984
4716
6117
5803
5490
5176
6301
5987
5674
5360
6484
6171
5857

5544

7143
6784
6425
6066
7327
6968
6609
6249
7511
7151
6792
6433
8231
7827
7422
7017
8415
8010
7606
7201
8599
8194
7789
7384
9382
8931
8481
8030
9565
9115
8665
8214
9749
9299
8848
8398

24 McQuay Ennity Water Source Heat Pumps Catalog 1103-2