McQuay THCH02 User Manual
McQuay® Horizontal Concealed Fan Coil Unit
®
Model THC (Vintage B)
Sizes 200 Through 1200 CFM
Catalog
C: 700-3
Table of Contents
Nomenclature..........................................................page 2
Introduction .............................................................page 3
Design Features...................................................page 3-4
Fan coil Construction Illustration ..........................page 3
Performance Data
Cooling Capacity (2-Pipe) .....................................page 5
Heating Capacity (2-Pipe) .....................................page 5
General Unit Data (2-Pipe) ...................................page 5
.............................................pages 5-6
All standard units
All custom units
Cooling Capacity (4-Pipe) .....................................page 6
1-Row Heating Capacity (4-Pipe) .........................page 6
General Unit Data (4-Pipe) ...................................page 6
Dimensional Data
Air Volume Capacity Data.........................................page 8
Motor Data
Wiring Diagrams
Engineering Guide Specications
Ratings certied by the Air Conditioning
& Refrigeration Institute (ARI)
................................................................page 8
...................................................page 7
.....................................................page 9
Nomenclature
F THC 2 H02 A A 70 A 69 AX 20 A A
................. page 10-11
Fan Coil
Description /Type of Product
THC = Horizontal THC Concealed
Design Series
1 = A Design
2 = B Design
Unit Size
Nominal Cfm
H02 = 200 H04 = 400 H08 = 800
H03 = 300 H06 = 600 H10 = 1000
H12 = 1200
Power Supply/Motor Voltage
A = 115V-60-1
E = 208/230V-60-1
J = 277-265V-60-1
Main Coil (Heating/Cooling)
A = 3-Row Coil
Secondary Coil (Heating)
70 = 1-Row Heating
SKU Type
A = Stock
C = Build to Order
Power Connection
A = Junction Box
Return Air
17 = Rear Ducted with Plenum, Filter & Duct
Collar
20 = No Plenum, Open Return
Discharge
AX = Front Discharge with Built in Duct Collar
Controls
00 = JBox with Terminal Strip & Wired Motor
Leads
69 = LV-3SP JBox, DDC Ready Interface and
Toggle Disconnect Switch
70 = Overow Switch, LV-3SP,
DDC Ready Interface and Toggle
Disconnect Switch
Hand Orientation
A = Same Hand - Left
B = Same Hand – Right
Page 2 of 12 / Catalog 700
Introduction
McQuay fan coils have been widely applied in hotels,
apartments, dormitories and military barracks, as-
sisted living facilities and ofces. They have earned
a reputation for quality - providing years of efcient,
reliable, quiet heating and cooling and easy, low-cost
installation and maintenance. The Model THC horizontal concealed fan coil unit is a slim, lightweight unit
that is ideal for installation in ceilings where height is
limited. Units are available in seven sizes from 200 to
1,200 cfm.
Design Features
Slim Prole
The highly compact, super lightweight design of the
Model THC fan coil unit makes it ideal for inside
ceiling installations where height is limited.
High Efciency Coil
Unique coil design promotes the mixture of warm and
cold air, resulting in high thermal efciency and lower
operating costs
.
Quiet and Efcient Centrifugal Fan-Motor
Assembly
With a dynamically balanced centrifugal fan wheel and
a high efciency motor assembly, the THC offers you:
1. Minimized vibration.
2. Low noise operation.
3. Low operating cost.
4. 4 speed tap motor for better speed control.
Indoor Air Quality Design
1. Coils
• All THC water coils feature aluminum blue ns
mechanically bonded to seamless copper tubes.
The blue ns are covered with an epoxy poly-
mer that causes condensation to drip off more
quickly, preventing mold build-up and increas-
ing the coil and n life expectancy.
• Hand operated brass air vent, conveniently lo-
cated over the drain pan, requires no tools for
venting, and is supplied with a clear plastic hose
to prevent spills.
Fan coil Construction Illustration
LV-3SP Jbox - Interface Control
Junction Box (Optional)
High Efciency Coil
Extended Positive Slope,
Indoor Air Quality Drain Pan
Top Panels built to keep
insulation out of airstream
Units with Plenum, removable Filter from
either side of the unit or bottom
Quiet
Centrifugal
Fan Assembly
Service-friendly
Manual Air Vent
Terminal Box (Basic)
Threaded Piping
Connections
Auxiliary Overow
Drain Connection
3/8" I.D.
Main Condensate Drain Connection
1/2" O.D. Smooth
Page 3 of 12 / Catalog 700
2. Drain Pan
• Galvanized or stainless steel.
• Extends past the coil to collect condensation
from valve and piping packages.
• Stamped with no welded corners.
• Positively sloped to provide proper drainage and
minimize microbial growth.
• Equipped with main condensate and auxiliary drain connections to provide overow
protection.
• Easily removable.
• Coated with a thick layer of powder paint and
baked for easy cleaning and to help protect
against microbial growth and corrosion.
• Insulated with form-tted, closed cell insulation
to prevent condensation build-up on the exterior
of the drain pan.
3. Return Air Plenum
• Units are available with or without a return air
plenum. Units with a plenum are supplied with a
high quality lter, lter guide and 3/4" return air
duct collar. Easy lter removal encourages fre-
quent changing, especially when the unit is used
with a McQuay T170 thermostat, which has a
lter reminder.
• Aluminum foil faced insulation is used in the
return air plenum to prevent glass bers from
entering the air stream, to reduce unit sweating,
and to attenuate fan noise.
• Top and side panels surrounding the coil are
also insulated with aluminum foil face to prevent the possibility of condensation forming on
the outside of the cabinet.
Electrical Connection - Control Interface
All remote thermostats and controls generally require
low voltage control wiring from the thermostat/control
device to the unit control box. That is why McQuay pro-
vides a full range of control options. See Thermostats
and Controls below.
Thermostats and Controls
Wall-mounted thermostats are available for all applications, ranging from a simple thermostat and/or 3-speed
switch to a digital, ADA display thermostat with auto-
stage control.
Note: For details on thermostats and wiring refer to ED18513.
Factory installed options include:
• Basic: A single point power connection junction box
that consists of a terminal strip for line-voltage con-
trol connection to an Off, Hi, Med, Lo switch, plus a
thermostat or a control.
• DDC ready interface via an LV-3SP control box: For
low-voltage applications, it includes three 24 volt
relays, a line voltage/24volt transformer, two sets of
terminal strips and a toggle disconnect. This interface control can be used with a simple 24 volt ther-
mostat or with building automation systems. This
interface is also available as a eld installed option.
Interface Control Junction Box
Flexible Coil and Piping Connections
Units are easily converted to opposite-hand orientation
without requiring additional parts or a conversion kit.
Heating and cooling pipe connections are located on the
same end. Four pipe coils are factory installed in the reheat position, but are easily eld-converted to the preheat position. Coils can be factory installed in the pre-
heat position as a special request.
Threaded or Sweat Connections
Coils feature a brass header with 3/4" FPT connections
to facilitate quick installation of McQuay threaded or
quick-connect, factory built valve packages. A galva-
nized steel cover plate protects the header and provides
additional structural support to facilitate connection of
any type of valve package and matched load pumps. If
sweat copper tube connections are desired, sets of two
(2) 3/4" MPT x 1/2" copper male adapters are provided
in the basic units.
Page 4 of 12 / Catalog 700
Note: For wiring diagram details for Vintage B THC units and the
LV-3SP Jbox refer to Certied Drawing FC-THC-H02-H012
Valve Packages
Two-way and three-way electric valves are available in
low- and line-voltage congurations for eld installation
on 2-pipe and 4-pipe systems. Basic, enhanced and de-
luxe valve/piping packages are also available with and
without quick-connect, threaded connections.
Valve/piping packages are available with and without
bleed lines. Packages without bleed lines will require
thermostats capable of sampling the entering water temperature to sense automatic changeover on two-pipe
changeover units. (Refer to valve/piping package Engi-
neering Data documentation).
Loading...