Installation and Maintenance
IM 851
Group: Fan Coil
Part No: 668040881
Date: October 2006
Condensate Overflow Control System for McQuay® Model TSC, TSH Horizontal Concealed Fan Coils
TSH unit
TSH unit drain pan with sensors
Safety Information
Introduction:
The installation of this equipment shall be in
accordance with the regulations of authorities
having jurisdiction and all applicable codes. It is the
responsibility of the installer to determine and
follow the applicable codes. Sheet metal parts,
self-tapping screws, clips, and such items
inherently have sharp edges, and it is necessary
that the installer exercise caution. This equipment
is to be installed only by an experienced
installation company which employs trained
personnel.
The condensate overflow kit is designed for field
installation on McQuay TSC and TSH fan coil units
only. It is attached to the raceway air baffle located in
the unit's electrical raceway. McQuay can factory
install the overflow device, but then the fan coil unit(s)
cannot be UL approved.
DANGER
!
Disconnect all electrical power before servicing
unit. Electrical shock will cause severe injury
or death.
!
With proper mounting, the two sensors included in the
kit will detect the presence of water in the drain pan
before overflow can occur (the water completes a
circuit which signals the device). The signal causes the
on-board relay to switch between Normally Open (NO)
and Normally Closed (NC) outputs. Removal of the
water automatically resets the board to normal
conditions.
!
WARNING
It is the installer’s responsibility to determine the proper
depth setting for the sensors based on application
conditions. Setting the sensors too high can allow
condensate overflow to occur. Setting the sensors too
low can cause nuisance tripping.
Rigorously adhere to field wiring procedures regarding
proper lockout and tagout of components.
!
WARNING
D
To avoid electrical shock, personal injury or death:
1. Installer must be qualified, experienced technician.
2. Disconnect power supply before installation to
prevent electrical shock and damage to equipment.
!
CAUTION
A
C
CAUTION
Sharp metal edges are a hazard, use care when
servicing to avoid contact with them.
E
B
A
B
C
D
E
Page 2 of 12
–
–
–
–
–
Mounting bridge
Condensate control board
Wires & sensors/clip kit
Transformer, 115V/24V, 10VA
Terminal strip
TSH, TSC Condensate Overflow Field Installed Kit
IM 851
Installation Procedure for Units
Without Electric Heater(s)
5.
Remove the two screws on each end of the unit
holding
the raceway air baffle, as shown in the
Certified Drawing
two photos below.
Notes: Before beginning the installation procedure,
read this document in its entirety. Be sure
to understand and follow the instructions
completely.
For units with factory installed overflow kits
proceed to steps 12 through 19 on page 5.
1.
Turn off and disconnect all power to the unit.
2.
On TSC units only, open the bottom hinged panel
and remove the screws from the interior panel.
This will remove the entire bottom assembly.
3.
Remove the four screws from the cover of the
electrical raceway as shown below.
4.
Remove the electrical raceway cover as shown
below.
6.
Remove the raceway air baffle.
Raceway
Air Baffle
IM 851
TSH, TSC Condensate Overflow Field Installed Kit
Page 3 of 12
7.
Remove the two zip ties from the raceway air
baffle (see below). These two holes will be used
to mount the overflow mounting bridge to the
raceway air baffle. On larger units there may be
more than two zip ties. Use the center-most
holes with the zip ties for mounting.
9.
8.
Reinstall the raceway air baffle and overflow kit
assembly into the unit, and secure it at each end
with the 4 screws (2-each end) as shown below.
Line up the mounting bridge holes with the zip tie
holes and secure the kit to the raceway air baffle
with the supplied screws, as illustrated in the
following two photos.
Page 4 of 12
TSH, TSC Condensate Overflow Field Installed Kit
IM 851
10.
11.
Secure the two ground wires with the screw
provided, to the raceway air baffle as shown.
Refer to the wiring schematic for standard units
without electric heater(s) (see Figure 1 or 2 on
page 10).
Pry out the ½ inch knockout closest to the
cooling coil connection. The photo below shows
the knockout for a right-hand piping connection
unit.
Certified Drawing
14.
Uncoil the sensors and wires and snap the
sensors into the sensor clips as shown above.
15.
Slide the sensors up or down in the clips to set the
depth at which condensate accumulating in the
drain pan will be sensed. Make sure the sensors
are at the same level.
Note: Accumulating condensate completes the
circuit between the two sensors which
signals the on-board relay to switch
between Normally Open (NO) and
Normally Closed (NC) outputs.
!
CAUTION
It is the installer’s responsibility to determine the proper
depth setting for the sensors based on application
conditions. Setting the sensors too high can allow
condensate overflow to occur. Setting the sensors too
low can cause nuisance tripping.
12.
Route the sensor wires through the ½ inch
knockout hole and into the electrical raceway.
17.
Secure the wires to the unit so that they cannot be
accidentally pulled or removed and change the
position of the sensor depth.
Install the sensor clips and sensors as described in
the following steps.
Note: Do not remove the paper backing from the
clips until you have determined where to
place them. The adhesive on the clips is
very strong, making it difficult to reposition
once stuck in place.
13.
16.
Peel off the paper backing from the sensor clips
and attach the clips to the lip of the drain pan as
shown in the following photo.
IM 851
!
CAUTION
Improper positioning of the sensors can allow
condensate overflow to occur.
18.
Wire the sensors to the “COND” connections on
the overflow board. Refer to the wiring
schematics for standard units, without electric
heater(s) (see Figure 1 or 2 on page 10).
19.
Perform steps 1 through 3 in reverse order to
reattach the raceway cover.
TSH, TSC Condensate Overflow Field Installed Kit
Page 5 of 12
Installation Procedure for Units With
Electric Heater(s):
To field-install the overflow kit to the raceway air
baffle equipped with electric heater(s), perform the
following procedure. See IM 233 if installing the
electric heater.
1.
Perform steps 1 through 5 on page 3.
2.
Remove the raceway air baffle with the electric
heater(s).
3.
Remove the electric heat relay(s) from the
raceway air baffle as shown below.
Note: On larger units there will be more than one
electric heater element. Select either the
right or left element, whichever is most
appropriate for mounting the overflow
device.
4.
5.
Using the same holes and screws, mount the
overflow kit (mounting bridge) to the raceway air
baffle and the electric heater(s) as shown in the
two photos below.
Note: For clarity, the factory mounted components
on the overflow kit (mounting bridge) are not
shown in the next three photos
Remove the screws that hold the electric heater
to the raceway air baffle as shown in the next
two photos. (Keep these screws, they will be
reused).
Page 6 of 12
TSH, TSC Condensate Overflow Field Installed Kit
IM 851
6.
Remount the electric heater relay(s) removed in
step 3 to the overflow kit mounting bridge, in the
location shown in the photo below.
Note: The overflow kit and mounting bridge
should look like the assembly in the photo
below
8.
Secure the two ground wires with the screw
provided,
to the raceway air baffle (see below).
Certified Drawing
Refer to the wiring schematic for units with
electric heater(s) (see Figure 3 or 4 on page 11 or 12).
9.
Pry out the ½ inch knockout closest to the
cooling coil connection. The photo below shows
the knockout location for a right-hand piping
connection unit.
10.
Install the sensors and sensor clips as described in
the following steps.
Electric heater relay mounted
7.
Reinstall the raceway air baffle and overflow kit
assembly into the unit, and secure it at each end
with the 4 screws (2-each end) as shown below.
IM 851
TSH, TSC Condensate Overflow Field Installed Kit
Page 7 of 12
Note: Do not remove the paper backing from the
clips until you have determined where to
place them. The adhesive on the clips is
very strong, making it difficult to reposition
once stuck in place.
11.
Peel off the paper backing from the sensor clips
and attach the clips to the lip of the drain pan as
shown in the following photo.
12.
Uncoil the sensors and wires and snap the
sensors into the sensor clips as shown above.
13.
Slide the sensors up or down in the clips to set the
depth at which condensate accumulating in the
drain pan will be sensed. Make sure the sensors
are at the same level.
!
CAUTION
Improper positioning of the sensors can allow
condensate overflow to occur.
16.
Wire the sensors to the “COND” connections on
the overflow board. Refer to the wiring
schematics for units with electric heater(s) (see
Figure 3 or 4 on page 11 or 12).
17.
Replace the electrical raceway cover and secure
as shown below.
Note: Accumulating condensate completes the
circuit between the two sensors which
signals the on-board relay to switch
between Normally Open (NO) and
Normally Closed (NC) outputs.
!
CAUTION
It is the installer’s responsibility to determine the proper
depth setting for the sensors based on application
conditions. Setting the sensors too high can allow
condensate overflow to occur. Setting the sensors too
low can cause nuisance tripping.
14.
Route the sensor wires through the ½ inch
knockout hole and into the electrical raceway.
18.
If a TSC unit, reattach the bottom hinged panel
assembly.
15.
Secure the wires to the unit so that they cannot be
accidentally pulled or removed and change the
position of the sensor depth.
19.
Return power to the unit.
Page 8 of 12
TSH, TSC Condensate Overflow Field Installed Kit
IM 851
Electrical Terminal Descriptions
GND
The GND terminal is the input for the 24 volt common
wire.
COND
The COND terminals are the input terminals for
the condensation sensor wires. When continuity is
sensed between the two wires placed in the drain pan
for a duration of at least one second, the control will
assume that condensation is present and turn off
the load. It will then transfer the contacts to the
normally closed (alarm) position and output to the
optional overflow LED (LED +/-).
Options for Remote Signaling
Certified Drawing
Visual Alarm (Order separately)
Audible/Visual Alarm (Order separately)
LED (+/-)
The LED +/- terminals output to the optional overflow
LED alarm when the control is in a condensation fault
condition.
Circuit Outputs (COM/N.O./N.C.)
The COM, N.O., and N.C. terminals are the output
terminals for the load and alarm contacts. When no
condensation is present and 24 VAC is applied to the
control, the COM and N.O. contacts will be closed.
When condensation is detected, the control transfers the
contacts and makes continuity between the COM and
N.C. terminals.
Electrical Data
Electrical Ratings
OUTPUT
COM
N.O.
N.C.
TYPE
Relay; common
Relay; normally open
Relay; normally closed
NOMINAL
N/A
N/A
N/A
MINIMUM
N/A
N/A
N/A
MAXIMUM
N/A
10 Amps @ 150 volts
10 Amps @ 150 volts
Note: 24v powers the control board only. The output can run on 24v or 115v only.
Circuit Inputs (24 VAC)
INPUT
24 VAC
GND
COND
LED (+/-)
IM 851
TYPE
Power Supply
Power Supply
Sensor
LED
NOMINAL
24 VAC
24 VAC
N/A
N/A
MINIMUM
18 VAC
18 VAC
N/A
N/A
TSH, TSC Condensate Overflow Field Installed Kit
MAXIMUM
32 VAC
32 VAC
N/A
N/A
Page 9 of 12
Electrical Wiring Schematics
Electrical Wiring for Units Without Electric Heater(s)
Figure 1. Typical System Wiring to Thermostat*
Figure 2. Typical System Wiring to Three-speed Switch*
*Consult your local McQuay Representative for alternative wiring.
Page 10 of 12
TSH, TSC Condensate Overflow Field Installed Kit
IM 851
Electrical Wiring for Units With Electric Heater(s)
Figure 3. Typical System Wiring to Thermostat*
Certified Drawing
*Consult your local McQuay Representative for alternative wiring.
IM 851
TSH, TSC Condensate Overflow Field Installed Kit
Page 11 of 12
Figure 4. Typical System Wiring to Three-speed Switch*
*Consult your local McQuay Representative for alternative wiring.
McQuay Training and Development
Now that you have made an investment in modern, efficient McQuay equipment, its care should be a high priority.
For training information on all McQuay HVAC products, please visit us at www.mcquay.com and click on training, or
call 540-248-9646 and ask for the Training Department.
Warranty
All McQuay equipment is sold pursuant to its standard terms and conditions of sale, including Limited
Product Warranty. Consult your local McQuay Representative for warranty details. Refer to Form
933-43285Y. To find your local McQuay Representative, go to www.mcquay.com.
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.
©2006 McQuay International
(800) 432-1342
www.mcquay.com
IM 851 / 10-06 Page 12 of 12