McQuay THC02 Instruction Manual

Installation & Maintenance Manual
IM 745
Gr oup: Fan-coil
Part Number: 106333001
Date: November 2009
Ceiling Concealed Fan-Coil Unit
Models: THC02, THC03, THC04, THC06, THC08, THC10, THC12
®
©2009 McQuay International

Table of Contents
Installation ............................................................. 3
Receiving ............................................................... 3
Air duct connection ............................................... 4
Drain pipe connection............................................ 4
Pipe connection ..................................................... 4
Wiring .................................................................... 4
Maintenance........................................................... 4
General................................................................... 4
Monthly intervals................................................... 4
Wiring Diagrams ................................................5-6
Motor ...............................................................5
Control .............................................................6
Warranty Return Material Procedure..................... 7
Replacement Parts ................................................. 7
LimitedWarranty
Consult your local McQuay Representative for
warrantydetails.Referto Form933-43285Y. Tofind
your local McQuay Representative, go to
www.mcquay.com.
! CAUTION ! WARNING
Sharp edges and coil surfaces are injury hazards. Avoid
contact with them.
Moving machinery and electrical power hazards may cause
severe personal injury or death. Disconnect and lock off
power before servicing equipment.
NOTICE
Installation and maintenance ar e to be performed only by qualified personnel who ar e familiar with and in compliance with
state, local and national codes and regulations, and experienced with this type of equipment.
IM 745 / Page 2 of 8 ©2009 McQuay International

Installation
Receiving
All units leaving the McQuay plant are inspected for quality
prior to shipment.
Carefully inspect all shipments immediatelyupon delivery. Note
visible damage on the carrier’s freight bill and request that the
carrier send a representative to inspect the damage. This may
be completed by telephone or in person, but should always be
confirmed in writing.
The shipment should be unpacked in the presence of the agent
so that the extent of the damage or loss can be determined. The
carrier’s agent will make an inspection report and a copy will
be given to the consignee for forwarding to the carrier with a
formal claim.
Unit Installation
The unit is designed to be concealed in the ceiling. Installation
and maintenance should be performed by qualified personnel
who are familiar with local codes and regulations, and experi-
enced with this type of equipment.
There are holes on the top of the unit for hanging the unit above
the ceiling. Please refer to Figure 1. , Figure 2., and Figure 3.
NOTICE
Make sure the top of the unit is level after installation. The
drain pan is designed with a little gradient to facilitate
drainage. Do Not Level Drain Pan!
NOTICE
Before installation and running the unit, please check the
following:
Figure 1.
Obstacle
Obstacle
1. There must be enough space for the unit installation
and maintenance. Please refer to the unit outline and
dimensions in Figure 1 for the minimum distance
between the unit and obstacles.
B A C
2. Mount with the lowest moving parts at least 8 feet above
the floor or grade level.
3. Ensure enough space for piping connection and
electrical wiring.
4. Leave a means for disconnection from the electrical
supply according to NEC or local codes.
5. Check whether the hanging rods can support the weight
of the unit.
6. The unit must be installed horizontally for proper
operation and condensate draining.
Figure 2.
Ceiling
A
A
= 8 in.
B
= 16 in.
C
= 16 in.
Terminal
Block
7. The exter nal static pressure must be within the
allowable static pressure range.
8. The installing contractor must supply service valves and
insulation for water piping in accordance with local codes
and regulations.
Ceiling
Discharge Air
Return Air
Ceiling Access Panel
with Air Return
9. To prevent strain on the wire connections, use either
conduit or approved strain relief device.
10. Confirm that the power has been switched OFF before
installing or servicing the unit.
Nut
Vibration
Isolator
Fan Coil
Unit
Expansion
Screw
Hanging
Rod
Flat
Washer
Detail A
IM 745 / Page 3 of 8 ©2009 McQuay International

Figure 3.
A
Ceiling
Return Air
Plenum
Pipe Connection
Chilled Wa ter Pipe Connection
Connect chilled water pipes to the unit. The water inlet is on the
bottom and water outlet is on top.
Wiring
Wiring connection must be completed according to the wiring
diagram on the unit.
Discharge Air Return Air
Return Air Grille
with Filter
Expansion
Screw
The unit must be GROUNDED.
Installation of all field wiring must comply with NEC and
local codes.
Nut
Hanging
Rod
! WARNING
Vibration
Isolator
Fan Coil
Unit
Flat
Washer
A means for disconnect from electrical supply shall be
provided according to NEC or local codes. Confirm that the
power has been switched OFF before installing or servicing
the unit.
Air Duct Connection
Detail A
Maintenance
General
Air ducts should be made of galvanized steel and
connected to the flange of the unit with a canvas connector.
Refer to the unit dimensions. Insert the duct into the flange and
fix with screws.
Duct connections must be installed in accordance with national
and local codes.
Drain Pipe Connection - Per Local Codes
The drain pipe can be PVC or steel. Connect the drain pipe to
the unit. Pipe insulation is recommended to avoid condensa-
tion. The suggested slope of the drain pipe is at least 1/8" per
foot, but local code will prevail. Refer to Figure 4 for typical
A good general maintenance plan will avoid performance loss
and unexpected shut-down of the equipment.
A dirty filter reducesair flow as well as unit performance. Chang-
ing or cleaning the filter is very important. Check the filter
monthly and replace or clean as required.
Coils should be cleaned of dust, dirt and lint with compressed
air or water. Theycan be vacuumedor brushed with asoft brush.
! CAUTION
piping installation.
Figure 4.
Return Ball Valve
Control Valve
Actuator
Water coils exposed to freezing temperatures should be
drained or anti-freeze should be added to the water circuit
to avoid freezing.
Monthly inter v als
1. Inspect and clean the condensate drain pan to avoiding
clogging of drainage by dirt, dust, etc. Inspect drainage
piping for proper condensate flow.
2. Check and clean the coil. Clean the coil with a low pressure
water jet or low pressure air.
3. Clean and tighten all the wiring connections.
Supply Gate Valve
IM 745 / Page 4 of 8 ©2009 McQuay International

Dimensional Data – THC Horizontal Concealed, with Plenum Box
Filters
Unit Size A B C D E
Number
of Fans
Size Qty
S02 32.05" 17.64" 19.17" 19.96" 18.46" 1
18
1
/ 8 " x 8" x 1"
1
S03 38.74" 24.33" 25.87" 26.65" 25.15" 1
24
7
/ 8 " x 8" x 1"
1
S04 43.86" 29.45" 30.98" 31.77" 30.20" 2
29
7
/ 8 " x 8" x 1"
1
S06 51.73" 37.32" 38.86" 39.65" 38.07" 2
18
7
/ 8 " x 8" x 1"
2
S08 61.57" 47.17" 48.70" 49.49" 47.91" 3
23
3
/ 4 " x 8" x 1"
2
S10 65.51" 51.10" 52.64" 53.43" 51.85" 3
25
3
/ 4 " x 8" x 1"
2
S12 75.75" 61.34" 62.87" 63.66" 62.09" 4
30
7
/ 8 " x 8" x 1"
2
D
E
FILTER
4 - MOUNTING HOLES 3/8" x 5/8"
2.32"
7.36"
CONDENSATE
DRAIN 3/4" MPT
1.5"
B
C
3.38"
5.75"
AIR
VENT
A
TOP VIEW
Plenum Back with Filter
1.02"
5.63"9.75"
FRONT VIEW 1.40" CONDENSATE
DRAIN 3/4" MPT
FILTER
RA
4-Pipe System
2-Pipe System
IM 745 / Page 5 of 8 ©2009 McQuay International

Wiring Diagrams
Wiring (115V/1P/60Hz)(208-230V/1P/60Hz)(265/277V/1P/60Hz)
For Models: THCH02, THCH03, THCH04, and THCH06 For Models: THCH08, THCH10, THCH12
For Models: THCH02, THCH03, THCH04, THCH06, THCH08, THCH10, THCH12 (WITH VOLTAGE TRANSFORMER)
Wiring (115V/1P/60Hz) (208-230V/1P/60Hz)
(265/277V/1P/60Hz)
IM
745 / Page 6 of 8 ©2009 McQuay International
! !
! !
! !

Control Wiring Schematic - Heating/Cooling 2-Pipe With Automatic Changeover
Control Wiring Schematic - Heating/Cooling 4-Pipe With Sequencing Thermostat
IM
745 / Page 7 of 8 ©2009 McQuay International

This document contains the most current product information as of this printing. For the most up-to-date
product information, please go to www.mcquay.com.
®
4900 T echnology Park Boulevar d • Auburn, New Y ork 13021-9030 • 800-432-1342 • www .mcquay.com IM 745 Pg 8 of 8
©2009 McQuay International