Carrier COMFORTLINK 50HG014 User manual

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
PC 111 Catalog No. 535-00024 Printed in U.S.A. Form 50HG-2SI Pg 1 9-01 Replaces: New
Book 1 4
Ta b 1 b 6 b
Installation Instructions
Part Numbers: CRHEATER144A00 through CRHEATER155A00
SAFETY CONSIDERATIONS
Read these instructions entirely before installing the acces-
sory electric heaters on the base rooftop unit. See Table 1 for
accessory heater data.
Installation and servicing of air-conditioning equipment can
be hazardous due to system pressure and electrical compo-
nents. Only trained and qualified service personnel should
install, repair, or service air-conditioning equipment.
Untrained personnel can perform the basic maintenance
functions of replacing filters. All other operations should be
performed by trained service personnel. When working on air-
conditioning equipment, observe precautions in the literature,
tags and labels attached to the unit, and other safety precautions
that may apply.
Follow all safety codes. Wear safety glasses and work
gloves. Use quenching cloth for unbrazing operations. Have
fire extinguishers available for all brazing operations.
GENERAL
This installation instruction covers accessory heaters
CRHEATER144A00 through CRHEATER155A00. Each kit
contains the heater module, block-off plate, 1 or 2 conduit assem-
blies, wire ties, and the wiring label. The CRHEATER153A00
accessory kit contains a terminal block in addition to these parts.
See Table 1 for unit electrical data and kit usage.
NOTE: All units with electric heat require a field-supplied
90-degree elbow. The elbow must be installed in the supply
ductwork below the unit discharge connection.
NOTE: CRHEATER153A00 (75 kW, 240 volt) requires a
dual-point power supply.
Table 1 — Electrical Data and Electric Heater Package Usage
*kW rated at 240, 480, and 600 volts.
Before beginning any modification, make sure all power is
disconnected to the unit and locked out. Failure to discon-
nect power supply prior to servicing may result in serious
injury. All wiring must comply with applicable national
and local codes.
Field modification of electric heat staging may result in the
overriding of electric heat safety switches and is prohibited.
Damage to equipment and personal injury may result.
When removing panels from the unit, be careful not to
damage the roof or other surfaces with the panels.
ACCESSORY HEATER
PART NUMBER UNIT 50HG HEATER/BASE UNIT VOLTAGE HEATER kW* STAGES
CRHEATER144A00 014 208/230-3-60 16 1
CRHEATER145A00 014 460-3-60 15 1
CRHEATER146A00 014 575-3-60 16 1
CRHEATER147A00 014, 016, 020, 024, 028 208/230-3-60 25 2
CRHEATER148A00 014, 016, 020, 024, 028 460-3-60 25 2
CRHEATER149A00 014, 016, 020, 024, 028 575-3-60 25 2
CRHEATER150A00 014, 016, 020, 024, 028 208/230-3-60 50 2
CRHEATER151A00 014, 016, 020, 024, 028 460-3-60 50 2
CRHEATER152A00 014, 016, 020, 024, 028 575-3-60 48 2
CRHEATER153A00 016, 020, 024, 028 208/230-3-60 75 2
CRHEATER154A00 016, 020, 024, 028 460-3-60 75 2
CRHEATER155A00 016, 020, 024, 028 575-3-60 78 2
50HG014-028
Single-Package Rooftop Units
Accessory Electric Heat

2
INSTALLATION
Dual Point Electrical Service Connec-
tion (CRHEATER153A00 ONLY) — The
CRHEATER153A00 electric heat accessory kit (75 kW,
240 Volt) requires an electrical service connection indepen-
dent from all other electrical circuits in the unit. This electri-
cal service should be sized in accordance with the following
heater rating:
To install dual point service connection, perform the follow-
ing procedure:
1. Turn off power to the unit.
2. Install auxiliary terminal block in compressor compart-
ment (Fig. 1).
3. Connect electrical service to terminal block.
4. Connect ring-terminal end of conduit to the terminal
block enclosure.
5. Connect ring terminals to terminal block.
6. Continue with Heater Installation section.
Heater Installation (All Units) — Perform the fol-
lowing procedure to install the accessory electric heaters:
1. Turn off power to the unit.
2. Remove electric heater section access panel from base
rooftop unit. See Fig. 2.
3. Remove the block-off plate and SAT (Supply Air Ther-
mistor) from electric heater compartment and save screws
(Fig. 2).
4. Remove the block-off plate from the right side of the
filter block-off panel. Remove and re-orient the conduit
bracket installed on the unit in either the one or two
conduit orientation appropriate for the application (see
Fig. 3).
5. The bracket on the condensate pan must be removed. In
order to remove the bracket on the condensate pan, the
filter shroud must first be removed (see Fig. 4). Next,
remove the bracket under the left side of the condensate
pan exposing the two-conduit slot (see Fig. 3). For units
that use only one conduit, rotate the bracket 180 degrees
and reinstall leaving half of the slot exposed. Reinstall the
filter shroud.
6. Route conduit from control box to heater compartment
passing through the slots exposed in Steps 4 and 5
(Fig. 5).
NOTE: The end of the conduit with ring terminals should
be toward the compressor end of the unit and the other
end toward the heater compartment.
7. Thread one end of conduit to the heater section partition.
Thread the other end to bottom of unit control box
(except CRHEATER153A00).
8. Slide heater module into heater compartment by aligning
the hanging bracket on end of heater with center rail in
unit heating compartment (see Fig. 6 and 7). Do not push
the heater all the way in at this time.
9. Route the SAT through the hole in top of electric heater
control box.
10. Feed power wiring into heater control box and slide the
heater into final position.
11. Secure electric heater control box to unit using screws
from Step 3. Heater will attach to holes in the back of the
electric heat control box.
12. Install SAT through the back of electric heater control
box using the screws saved from Step 3. Secure the SAT
wire to the top of the control box with the provided wire-
tie. SAT location is shown in Fig. 2.
13. Remove jumper wire from 6-pin plug and connect control
wires to plug in heater compartment partition.
NOTE: The mounting plate for the 6-pin plug may be
removed temporarily to increase access to make this con-
nection. Be sure to reinstall the mounting plate before
proceeding.
14. Connect power wires to terminal blocks in accordance
with the appropriate heater wiring diagram. (See Fig 8.)
15. Connect power wires to terminal block in unit con-
trol box (or dual-point service enclosure for
CRHEATER153A00). Refer to wiring diagram.
16. Reinstall electric heater section access panel.
17. Apply wiring label to inside of compressor compartment
door.
18. Apply power to unit.
VOLTS MCA MOCP
208/240 156/180 175/200
TERMINAL BLOCK INSTALLATION
(CRHEATER153A00 ONLY)
UNIT CONTROL BOX
Fig. 1 — Auxiliary Terminal Block Installation
(CRHEATER153A00 Only)
BLOCK-OFF
PLATE
SAT
ELECTRIC HEATER ACCESS PANEL
LEGEND
SAT — Supply-Air Thermistor
Fig. 2 — Heater Access Panel Location

3
CONDUIT PATH
CONDUIT
BRACKET
FILTER
BLOCKOFF
PANEL
BRACKET IS SHOWN FOR ONE
CONDUIT, FOR TWO CONDUIT
ROTATE BRACKET 180 DEGREES
CONDENSATE PAN
BRACKET
REMOVE SCREWS TO
DETACH FILTER
SHROUD (3 PLACES)
REMOVE SCREWS TO DETACH FILTER
SHROUD (2 PLACES)
REMOVE SCREWS TO DETACH FILTER
SHROUD (2 PLACES)
UNIT CONTROL BOX
POWER WIRE ROUTING
WIRE ROUTING
(CRHEATER153A00 ONLY)
TERMINAL BLOCK INSTALLATION
(CRHEATER153A00 ONLY)
Fig. 3 — Conduit Bracket Orientation
Fig. 4 — Filter Shroud Removal
Fig. 5 — Wire Routing

4
HEATER
MOUNTING
TRACK
HEATER MOUNTING
BRACKET
CENTER
RAIL
HEATER
MOUNTING
BRACKET
Fig. 6 — Heater Installation
Fig. 7 — Electric Heater on Center Rail

5
CRHEATER144A00 — 16 kW, 208/240 V
CRHEATER145A00 — 15 kW, 480 V
CRHEATER146A00 — 16 kW, 600 V
CRHEATER147A00 — 25 kW, 208/240 V
CRHEATER148A00 — 25 kW, 480 V
CRHEATER149A00 — 25 kW, 600 V
CRHEATER152A00 — 48 kW, 600 V
Fig. 8 — Electric Heater Wiring Schematics

6
CRHEATER151A00 — 50 kW, 480 V
CRHEATER154A00 — 75 kW, 480 V
CRHEATER155A00 — 78 kW, 600 V
CRHEATER150A00 — 50 kW, 208/240 V
CRHEATER153A00 — 75 kW, 208/240 V
Fig. 8 — Electric Heater Wiring Schematics (cont)

7
Configuring the ComfortLink™ Control — The
ComfortLink control must now be configured to operate the
electric heaters. The ComfortLink control must be configured
for Electric Heat (default is No Heat). In addition, if a 15-kW
electric heater has been installed, it will be necessary to change
the N.HTR configuration from 2 to 1 (2 is the default setting).
These configurations are changed through the Scrolling
Marquee Display by using the Configuration menu.
NOTE: Consult the Controls and Troubleshooting Guide for in
depth instructions on using and configuring the ComfortLink
control.
1. The ComfortLink control must be configured to use the
electric heater accessory. A password may be required to
edit the configurations depending on the previous settings
configured in the unit. Default password is “1111”.
2. To configure the ComfortLink control, use the arrow keys
to scroll the red LED on the display to the “Configura-
tion” position and press .
3. Use the arrow keys to scroll down until the display shows
“HEAT”. This is the Heating Configuration Sub Mode.
Press .
4. The ComfortLink control will display will the Type of
Heat (HT.TY) setting. Press once to select the
HT.TY setting for configuration. Press again. A
“0” will begin flashing.
5. Use the arrow keys to change the configuration form “0”
(No Heat) to “2” (Electric Heat) and press .
Press to save the setting.
6. For 15-kW single-stage electric heaters only, the Number
of Heat Stages must be changed from 2 to 1.
a. Use the arrow keys to scroll down to the Number
of Heat Stages setting (N.HTR). Press to
select the N.HTR setting for configuration.
b. Press again. Configuration value will
flash.
c. Use the arrow keys to change the configuration
from “2” (2 stages of heat) to “1” (one stage of
heat) and press .
d. Press to save the configuration change.
7. Configuration of ComfortLink control is now complete.
Pressing multiple times will return the
display to the auto-scroll setting.
8. Close and secure all access doors.
ENTER
ENTER
ENTER
ENTER
ENTER
ESCAPE
ENTER
ENTER
ENTER
ESCAPE
ESCAPE

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
PC 111 Catalog No. 535-00024 Printed in U.S.A. Form 50HG-2SI Pg 8 9-01 Replaces: New
Book 1 4
Ta b 1 b 6 b
Copyright 2001 Carrier Corporation