McQuay FHVC User Manual
Engineered for flexibility and performance™
ThinLine™ 3G Vertical Unit Heaters Catalog 723
Type FHVC, FHVH, FHVS, FHWC Vertical Design
Model FHVS
Model FHVC
Contents
Nomenclature and Certification 3
ThinLine 3G Vertical Cabinet Unit Heaters . . . . . 3
ARI Certification . . . . . . . . . . . . . . . . . . . . . . . 3
Agency Listed . . . . . . . . . . . . . . . . . . . . . . . . . 3
Features and Benefits 4
The ThinLine™ 3G Advantage. . . . . . . . . . . . . . . 4
For building owners. . . . . . . . . . . . . . . . . . . . . 4
For specifying engineers. . . . . . . . . . . . . . . . . 4
For contractors . . . . . . . . . . . . . . . . . . . . . . . . 5
Options and Accessories 6
Control Options . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Manual 4-Position Fan Switch. . . . . . . . . . . . . 6
Unit-Mounted, Mechanical Thermostat With 4-Po-
sition Fan Switch. . . . . . . . . . . . . . . . . . . . . . . 6
Digital Thermostats. . . . . . . . . . . . . . . . . . . . . 6
DDC Interface Board. . . . . . . . . . . . . . . . . . . . 7
Customer-Supplied Controls. . . . . . . . . . . . . . 7
Decorative Wall Plate Option 8
Fresh Air Damper Options (Manual and Motorized).
8
Fresh Air Intake Box Option. . . . . . . . . . . . . . . . . 8
Tamperproof Cabinet Option . . . . . . . . . . . . . . . . 8
Rear Cabinet Extension Option . . . . . . . . . . . . . . 8
Leveling Legs Option . . . . . . . . . . . . . . . . . . . . . . 9
Raised Sub-Bases and Extended-Width End Pock-
ets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Return Air Grille . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Factory Valve & Piping Packages . . . . . . . . . . . . 9
Control Valve Options. . . . . . . . . . . . . . . . . . 10
Unit Selection 11
Unit Selection. . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Basic design data . . . . . . . . . . . . . . . . . . . . . . . 11
Unit size . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Performance Data 12
Heating Performance - Hot Water Coil . . . . . . . 12
Electric Heat Data 13
Air Volume Capacity Data 14
Motor Electrical Data 15
Physical Data 16
Unit Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Unit Dimensions 17
Decorative Wall Plate Dimensions. . . . . . . . . . . 21
Fresh Air Intake Box Dimensions . . . . . . . . . . . 21
Engineering Guide Specification 22
McQuay ThinLine 3G unit heater. . . . . . . . . . . . 22
Performance. . . . . . . . . . . . . . . . . . . . . . . . . 22
Coils . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Supply Fan . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Filter Section. . . . . . . . . . . . . . . . . . . . . . . . . 22
Fresh Air Damper. . . . . . . . . . . . . . . . . . . . . 22
Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Valve/Piping Packages. . . . . . . . . . . . . . . . . 23
Other Available Options . . . . . . . . . . . . . . . . 24
Nomenclature and Certification
FH V S - 1 02 A
Unit Type
FC = Fan Coil
FH = Cabinet Unit Heater
Unit Configuration
V= Vertical
W = Wall Hung
I = Inverted Wall Hung
Cabinet Type
C = Cabinet (Flat Top)
S = Slope Top
H = Hideaway
Voltage
A = 115/60/1
E = 208-230/60/1
J = 265-277/60/1
Unit Size
02 = 200 CFM
03 = 300 CFM
04 = 400 CFM
06 = 600 CFM
08 = 800 CFM
10 = 1000 CFM
12 = 1200 CFM
Design Series
ThinLine 3G Vertical Cabinet Unit Heaters
Figure 1: Nomenclature
Nomenclature and Certification
ARI Certification Agency Listed
Standard size units certified in accordance
with the Room Fan-Coil Unit certification
program, which is based on ARI Standard
All standard units
All Canadian units
440.
McQuay Catalog 723 3
Features and Benefits
Multiple Control Options
• From 3-speed switch to DDC interface board
• Remote or unit-mounted
• 3-speed or staged fan
Multiple
Configurations
• Flat top
• Slope top
• Hideaway
• Wall mounted
• Inverted
Multiple Coil Options
• 2, 3 or 4-row main coil
• Electric heat option
Multiple Grille Options
• Stamped and multi-
directional outlet grilles
• Return grille option
Diverse, Flexible Valve
& Piping Packages
• Factory-mounted, wired and
tested
• Or, factory-assembled and
shipped loose
• Normally closed or open, on/
off or modulating valves
Easily Removed Motor Assembly
• For easy maintenance and service
Features and Benefits
The ThinLine™ 3G Advantage
New ThinLine 3G vertical unit heaters combine the features
most desired in a unit heater by building owners, specifying
engineers and contractors alike. The result is a new, third
generation unit heater design that meets the needs of all three.
For building owners
For building owners, ThinLine 3G unit heaters offer quiet
operation. They fully comply with ASHRAE 62.1-2004
standards for high indoor air quality. And they offer a range of
control options that can enhance occupant comfort and reduce
operating costs. These units are also easy to maintain, with
easy access to filters, fan motors and control systems.
For specifying engineers
For specifying engineers, ThinLine 3G unit heaters provide
great versatility. Five different vertical models are available
with multiple arrangements and configurations.
Figure 2: Unit Features
• Coil options include two, three, and four-row hot water
coils. An electric heat option is also available for use when
hot water is shut down for the season.
• Multiple control options range from a simple fan speed
switch to a DDC interface board that can tie into most
building automation systems. Non-communicating or
communicating control options for LonTalk and BacNet will
be available soon. Contact your McQuay representative for
details.
• Grille options include multi-directional outlet grilles which
can be rotated for discharge in four different directions.
Stamped inlet and outlet grilles are available. Slope-top and
inverted vertical cabinet units are also available.
• Appearance options including four cabinet colors, three
grille colors, painted recess flanges, aluminum wall boxes
and painted Decorative Wall Plate panels. Rear cabinet
extensions are available in 4 and 8-inch depths. An 8-inch
(20 cm) extended end pocket is available on the piping end
of cabinet style units. Key-operated, locking access doors
are available to prevent nuisance tampering with units and/
or controls. Leveling feet are also available.
4 McQuay Catalog 723
Features and Benefits
For contractors
For contractors, ThinLine 3G unit heaters feature Quick Ship
options for fast delivery and a number of features that make
installation fast and simple.
• Factory-mounted, wired and tested valve and piping
packages for quick hookup to the building piping to reduce
installation time. Packages can also be shipped loose with
the unit.
• Factory-mounted and tested controls minimize field setup.
Depending on the option requested, controls can be wired
with a 24 VAC transformer to provide a single-source power
connection to the unit. Several options are available for unit
or wall mounted thermostats and sensors. All wall-mounted
thermostat and zone sensors require only low-voltage
control wiring from the device to the unit control box.
• Easy, end-panel removal for hookup of electrical and piping
connections minimizes field-labor time and cost.
• End compartment panels can be removed for installation and
service without removing the front panel covering the fan
blower section. This means that airflow through the filter
and coil is not jeopardized for taking temperature and
performance readings.
• The fan deck and motor assembly is easily removed, when
required, for service.
McQuay Catalog 723 5
Options and Accessories
Options and Accessories
Control Options
Manual 4-Position Fan Switch
This four-position fan switch (Off, High,
Med, Low) option is available remotemounted. It operates on low-voltage or
line-voltage power and can be provided
with a factory-mounted, low-voltage DDC
interface board, which contains 3-24 volt
relays with line voltage contactors and
terminal connections. The transformer is
factory-installed and wired.
Sequence of operation
• Off: Fan is turned off. The two-position, motorized fresh-air
damper, when supplied, is closed.
• High, Medium, Low: Fan runs continuously at the selected
speed. The two-position, motorized fresh-air damper, when
supplied, is opened.
Unit-Mounted, Mechanical Thermostat With 4-Position Fan Switch
This unit-mounted
option combines the
four-position fan switch
described above with a
mechanical thermostat.
Sequence of operation
• Fan Switch
• Off: Fan is turned
off. The twoposition, motorized fresh-air
damper, when
supplied, is closed.
• High, Medium, Low: Fan runs continuously at the
selected speed. The two-position, motorized fresh-air
damper, when supplied, is opened.
• Thermostat
• Cycles the valve(s) open or closed on demand based on
occupant-desired level.
Table 1. For more information, refer to the McQuay
publication ED 18513.
MT155 Thermostat
The MT155 series thermostat provides on-off control for lowvoltage or line-voltage valves and fan motors. It is remote-wall
mounted. Options include three-speed fan control for
continuous or cycling fan operation.
Figure 3: MT155 Thermostats
Three standard control options are available:
• On-off fan cycle operation only: The thermostat cycles the
fan from the manually selected fan speed (high, medium or
low) to off.
• Continuous fan and on-off valve cycle operation: The
thermostat cycles the valves on and off. The fan runs
continuously at the manually selected fan speed.
• On-off fan and on-off valve cycle operation: The thermostat
cycles the fan from the manually selected fan speed to off
and it cycles the valves on and off.
When the system switch is in the off position, the unit heater
system including the fan is shut off.
MT158 and MT168 Thermostat-Controllers with Digital Display
Series MT158 and MT168 microprocessor-based thermostatcontrollers combine a proportional integral control algorithm
with adaptive logic. They can be unit-mounted or remote-wall
mounted.
Figure 4: MT158 and MT168 Thermostats
Digital Thermostats
McQuay offers a broad
range of unit-mounted and
remote, wall-mounted
digital thermostats with
the capability to control
on-off, 3-wire and
proportional modulating
valves, and normally
closed or normally open
actuator valves. See
6 McQuay Catalog 723
Heating outputs for the MT158 are individually configurable
for three-wire floating control valves or on/off valves in the
normally open or normally closed modes.
Heating outputs for the MT168 provide 0-10 Vdc or 4-20 mA
The integrated, three-speed fan control switch is line voltage to
Options and Accessories
allow direct connection to the fan motors. Remote setback
capability is available from a time clock or facility
management system. Features include a Fahrenheit or Celsius
digital display.
Two standard control options are available:
• Continuous fan and modulating (or on-off) valve operation.
The fan runs continuously at the manually selected fan speed
(high, medium or low). The controller modulates the valves
or, on the MT158, dip-switches can be set to cycle the valves
on and off.
• On-off fan cycle operation and modulating (or on-off) valve
operation. The controller cycles the fan from the manually
selected fan speed to off. The controller modulates the
valves or, on the MT158, dip-switches can be set to cycle the
valves on and off.
Table 1: ThinLine 3G Thermostat Offerings
Thermostat Type Mounting
Manual three speed fan switch Remote
Single-pull, double-throw heating/cooling thermostat
with manual heat-off-cool system switch and manual
three-speed fan switch
Single-pull, double-throw thermostat only Unit
Two-pole dead-band auto-changeover thermostat with
manual on-off system switch and manual three-speed
fan switch
Two-pole dead-band auto-changeover thermostat Unit
Digital thermostat 24 vac/120-277 vac with 3-speed fan
control (continuous or fan cycle)
Digital thermostat 24 vac/120-277 vac with staged fan
(continuous or fan cycle)
Digital thermostat with on/off or three-wire floating
valve control.
Digital thermostat with on/off or three-wire floating
valve control, and manual three-speed fan switch
Digital thermostat with modulating valve control
Digital thermostat with modulating-valve control, and
three speed fan switch
Unit
Unit
Remote
Remote
Unit or
Remote
Unit or
Remote
Unit or
Remote
Unit or
Remote
DDC Interface Board
The low-voltage,
DDC interface
board is used with
any remote (wall
mounted) McQuay
thermostat or
control. It can also
be used with a BAS
(Building
Automation
System) control
where low voltage
is needed to operate
the unit heater.
The DDC interface board includes:
• Three 24-volt relays with line-voltage contactors to operate
the fan motor speeds.
• Terminal connections for interfacing to:
• An optional wall-mounted thermostat.
• Low-voltage actuators for cooling valves.
• A return air sensor.
• A factory-wired and installed transformer.
Customer-Supplied Controls
Your McQuay representative can work with engineers and/or
contractors to factory install and wire other manufacturers’
DDC controllers in one of the end pockets of the unit heater.
Contact your local McQuay representative for assistance with
your specific project.
McQuay Catalog 723 7
Options and Accessories
Decorative Wall Plate Option
Decorative wall plates have rounded corners and an antique ivory
finish for an attractive appearance. Other colors are available upon
request. See Figure 10, page 21 for dimensional data.
Fresh Air Damper Options (Manual and Motorized)
A fresh air intake that will provide up to 25% fresh air with insect air
screen and damper blade, can be ordered either factory installed or as
a field installed kit. The kit consists of an intake with damper blade
and insect screen. The damper may be manually controlled through
the return air opening or with an optional field-installed damper
motor. If freezing air temperatures are expected, the damper must be
closed or outside air must be tempered before entering the unit.
Tamperproof Cabinet Option
This option can be factory- or field-installed on cabinet units to
prevent access to unit controls and easy removal of cabinet panels. It
includes a key lock access door to unit controls and torx head screws
for cabinet panels.
Rear Cabinet Extension Option
This kit is available for applications where additional depth is
necessary. Four-inch extension kits are available. Other
extension depths are available as a special. Contact your
McQuay Representative for details. This kit is not designed to
be an air duct or outside air plenum.
Fresh Air Intake Box Option
Fabricated of aluminum with weep holes and a double set of louvers
in series to prevent moisture draw-through. This is used with a fresh
air damper and is mounted in an exterior wall.See Figure 11,
page 21 for dimensional data
Some common applications for the rear cabinet extension
include:
• Allow additional depth for appearance of unit.
• Allow additional clearance for cross-over piping and
connections.
• Extend the discharge grille past drapery or wall hangings.
• Cover floor covering terminations in remodeling projects.
• Allow for piping entry through the side panels of the unit.
8 McQuay Catalog 723
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