McQuay FCVC User Manual
Engineered for flexibility and performance™
ThinLine™ 3G Vertical Fan Coils Catalog 722
Type FCVC, FCVH, FCVS Vertical Design
Model FCVC
Model FCVS
Contents
Nomenclature and Certification 3
ThinLine 3G Vertical Fan Coils . . . . . . . . . . . . . . 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
Condensate Overflow Switch 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
Available Packages. . . . . . . . . . . . . . . . . . . . 10
Control Valve Options. . . . . . . . . . . . . . . . . . 10
Unit Selection 12
Unit Selection. . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Basic design data . . . . . . . . . . . . . . . . . . . . . . . 12
Unit size . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Coil types . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Performance Data 13
Two-Pipe Systems, Hot Water Heat 13
Four-Pipe Systems - Hot Water Preheat (1 or 2 row)
or Reheat (1 row) 14
Four-Pipe Systems - Steam Preheat or Reheat 15
Electric Heat Data 16
Air Volume Capacity Data 17
Motor Electrical Data 18
Physical Data 19
Unit Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Unit Dimensions 20
Decorative Wall Plate Dimensions. . . . . . . . . . . 24
Fresh Air Intake Box Dimensions . . . . . . . . . . . 24
Engineering Guide Specification 25
McQuay ThinLine 3G Fan Coil . . . . . . . . . . . . . 25
Performance. . . . . . . . . . . . . . . . . . . . . . . . . 25
General Construction - All Units . . . . . . . . . . 25
Cabinet. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Coils . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Supply Fan . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Filter Section. . . . . . . . . . . . . . . . . . . . . . . . . 26
Fresh Air Damper. . . . . . . . . . . . . . . . . . . . . 26
Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Valve/Piping Packages. . . . . . . . . . . . . . . . . 27
Other Available Options . . . . . . . . . . . . . . . . 28
Nomenclature and Certification
FC V S - 1 02 A
Unit Type
FC = Fan Coil
FH = Cabinet Unit Heater
Unit Configuration
V= Vertical
W = 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 Fan Coils
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 722 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
Multiple Coil Options
• 2, 3 or 4-row main coil
• 1 or 2-row preheat or 1-row
reheat coil
• Hot water or steam
• Same or opposite end
connections
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 Drain Pan & Motor Assembly
• For easy maintenance and service
• Sloped, polymer drain pan for good IAQ
Optional Secondary
Drain Pan
• Noncorrosive
• Easily removed
Features and Benefits
The ThinLine™ 3G Advantage
New ThinLine 3G vertical fan coils combine the features most
desired in a fan coil by building owners, specifying engineers
and contractors alike. The result is a new, third generation fan
coil design that meets the needs of all three.
For building owners
ThinLine 3G fan coils 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.
Figure 2: Unit Features
For specifying engineers
ThinLine 3G fan coils provide great versatility. A variety of
vertical models are available with multiple arrangements and
configurations.
• Coil options include two, three, and four-row main coils to
provide precise heating and cooling performance for any
requirement. Separate, single-row reheat coils (hot water or
steam) are available. Separate, one-row or two-row preheat
coils are also available with same or opposite-end coil
connections.
• 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.
4 McQuay Catalog 722
Features and Benefits
• Grille options include stamped inlet and outlet grilles and
multidirectional grilles. Aluminum fresh air boxes are also
available.
• Appearance options include cabinet units with a durable,
powder paint finish and decorative wall plate panels for
hideaway units in cupola white or antique ivory. Custom
colors are available as a special. Leveling feet are available,
as are rear cabinet extensions in 4 and 8-inch depths.
Tamper- proof units are another option, with 16-gauge steel
panels, a return grille and key-operated, locking access
doors.
For contractors
For contractors, ThinLine 3G fan coils 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. Valve and piping packages are designed for
entering-water-temperature sampling. This eliminates the
need for inefficient bleed lines to sense automatic
changeover on two-pipe units.
• 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.
• Both the main drain pan and optional secondary drain pan
are easily accessed for cleaning.
• The fan deck and motor assembly is easily removed when
required for service.
McQuay Catalog 722 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 linevoltage 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.
For two-pipe systems
with a factory installed
valve package, it can be
provided with a manual
switch (shown in
picture to the right) to
change from heating to
cooling. Or changeover
can be automatic.
Sequence of operation
• Fan Switch
• 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.
• Thermostat
• Cycles the valve(s) open or closed on demand based on
occupant-desired level.
• Changeover Switch: With a manual switch, the user selects
whether heating or cooling is desired. With automatic
changeover, a pipe sensor works with the thermostat to
operate the heating or cooling valve.
• Heating: Opens the valve when the temperature is below
the setpoint.
• Cool: Opens the valve when the temperature is above the
setpoint.
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
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 manual or automatic changeover
and 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 fan coil
system including the fan is shut off.
MT158 and MT168 Thermostat-Controllers wi th
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.
6 McQuay Catalog 722
Options and Accessories
Figure 4: MT158 and MT168 Thermostats
Heating and cooling 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 and cooling outputs for the MT168 provide 0-10 Vdc
or 4-20 mA The integrated, three-speed fan control switch is
line voltage to allow direct connection to the fan motors.
Manual or automatic changeover is provided with remote
setback capability from a time clock or facility management
system. Features include a Fahrenheit or Celsius digital display
and a built-in purge cycle which assists the controller to
determine if the system is supplying hot water or cooling.
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: Thermostats
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, heating/
cooling thermostat
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 dead-band auto-changeover for
heating/cooling. On/off or three-wire floating valve
control.
Digital thermostat with dead-band auto-changeover for
heating/cooling, On/off or three-wire floating valve
control, and manual three speed fan switch
Digital thermostat with auto-changeover, dead-band,
and modulating valve
Digital thermostat with auto change over, dead band,
modulating valve, and three speed fan switch
Unit
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 fan coil.
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 heating and cooling valves.
• A return air sensor.
• A pipe temperature sensor for changeover from heating
to cooling on two-pipe systems.
• An optional condensate overflow switch, when selected.
• 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 fan coil.
Contact your local McQuay representative for assistance with
your specific project.
McQuay Catalog 722 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.
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. A
provision to install a low-temperature sensor is recommended.
Condensate Overflow Switch Option
With proper mounting, the condensate overflow switch will detect
water collecting in the primary drain pan before overflow can occur.
This is an on-off switch that goes back to the normal position when
water is no longer present.
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.
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.
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.
Some common applications for the rear cabinet extension
include:
• Allow additional depth for appearance of unit.
8 McQuay Catalog 722
Options and Accessories
• 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.
Return Air Grille
A stamped-steel, return air grille is available as an option,
factory or field-installed.
Factory Valve & Piping Packages
Factory valve and piping packages are available for both twopipe and four-pipe systems with either right or left hand
connections. Four-pipe systems can be configured with the
heating and cooling connections on the same or opposite sides
of the unit. Packages can be either factory-installed or factoryassembled and shipped loose with the unit. Units are also
available without a valve and piping package in either a righthand or left-hand configuration. All packages are fully leak
tested.
Factory-installed packages are sweated to the coil and wired to
the unit control box or DDC. Chilled and hot water pipes are
the only field connections required. Piping is 1/2” nominal
copper (5/8” OD).
Figure 5: Four-pipe deluxe valve and piping package
Leveling Legs Option
Field or factory-installed kits are available with 0” to 1" adjustment
for positive leveling of floor-mounted units.
Raised Sub-Bases and ExtendedWidth End Pockets
Extended-height subbases and extended end pockets are
available as a special. Contact your McQuay Representative
for more information.
Note: S tandard end pockets on McQuay units can accomodate
most requirements. Therefore, extended pockets are
seldom needed.
Pre-determined field connection points are located for easy
access. See Figure 6, page 11 for connection locations. The
installing contractor can pre-pipe the building water
connections before the units arrive on the jobsite. A label
clearly identifies chilled and hot water connection points on
every unit.
All chilled water piping and components are located to allow
condensate to drain into the secondary drain pan. Insulation of
the factory piping package is not required.
McQuay Catalog 722 9
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