25
position 2 (right-hand opening), thus permitting a heater mounting
in the right-hand heater opening and preventing its inadvertent
mounting in the left-hand heater opening.
5. Connect the heater control wiring to terminal block TB4
located left of heaters. (See Fig. 54 and 55.)
TB4 has five terminals. (See Fig. 40-43.) Bottom row left
terminal is “R Use”; it has a factory RED connection. Bottom
row right terminal is “C Use”; it has a factory BRN
connection. For AC units, top row left is designated as
“W1Use” and has factory ORN connections. The top row
center is designated as “W2 Use” and has factory VIO
connections. For HP units, top row left and center terminals
are designated “W2 Use” and have factory ORN connections.
The fifth terminal is for field-option connection of a staging
control.
a. CRHEATER288A00-293A00 Heaters:
These heaters have two control wires: ORN for heater
contactor and BRN for control common. Connect BRN
wire(s) to TB4’s “C Use” terminal.(Second BRN wire
will require use of the piggyback terminal on the factory
BRN wire.) For AC units, connect heater ORN control
wiring to ORN on TB4 for first stage heating. (See
Fig. 44.) For HP units, connect heater ORN control
wire(s) to an available terminal on TB4’s “W2 Use”
group. (See Fig. 49.)
b. CRHEATER294A00-296A00 Heaters:
These heaters have four control wires: ORN and VIO for
heater contactors, RED for safety circuit power and
BRN for control common. Connect RED wire to TB4’s
“R Use”. Connect BRN wire to TB4’s “C Use” terminal.
For AC units with one heater package that has these 4
control wires, connect heater ORN control wiring to
ORN on TB4 for first stage heating and to VIO on TB4
for second stage heating. (See Fig. 45.)
c. For HP units, connect ORN and VIO wires to TB4’s
“W2 Use” terminals. (See Fig. 50.)
d. CRHEATER370A00, 377A00, 384A00 Dual Module
Heaters:
These heaters have four control wires: Two ORN for
heater contactors and relays and two BRN for control
common. Connect BRN wires to TB4’s “C Use”
terminal. (Second BRN wire will require use of the
piggyback terminal on the factory BRN wire.) Connect
ORN heater control wire with W1 label to ORN on TB4
for first stage heating and the ORN heater control wire
with W2 label to VIO on TB4 for second stage heating.
(See Fig. 46.) For HP units, connect both ORN heater
control wires to an available terminal on TB4’s “W2
Use” group. (See Fig. 42 and 51.) See heater wiring label
shipped with the heater for complete details of heater
internal wiring. Label must be placed on the heater
cover(s) per Step 3 on page 33.
e. CRHEATER367A00, 368A00, 374A00, 375A00,
381A00, 382A00 Dual Module Heaters:
These heaters have six control wires: Two ORN and one
VIO for heater relays, one RED for safety circuit power
and two BRN for control common. Connect RED wire
to TB4’s “R Use”. Connect BRN wires to TB4’s “C
Use” terminal. For AC units, connect both the ORN and
VIO heater control wires that are bundled together with a
RED and BRN wire to ORN on TB4 for first stage
heating and connect the other ORN heater control wire
bundled only with a single BRN wire to VIO on TB4 for
second stage heating. (See Fig. 47.) For HP units,
connect all three ORN and VIO wires to TB4’s “W2
Use” terminals. (See Fig. 42 and 52.) See heater wiring
label shipped with the heater for complete details of
heater internal wiring. Label must be placed on the
heater cover(s) per Step 3 on page 33.
f. CRHEATER369A00, 376A00, 383 Dual Module
Heaters:
These heaters have seven control wires: Two ORN and
two VIO for heater relays, one RED for safety circuit
power and two BRN for control common. Connect RED
wire to TB4’s “R Use”. Connect BRN wires to TB4’s “C
Use” terminal. For AC units, connect both the ORN and
VIO heater control wires that are bundled together with a
RED and BRN wire to ORN on TB4 for first stage heat
-
ing and connect the ORN and VIO heater control wires
bundled only with a single BRN wire to VIO on TB4 for
second stage heating. (See Fig. 48.) For HP units,
connect all four ORN and VIO wires to TB4’s “W2 Use”
terminals. (See Fig. 42 and 53.) See heater wiring label
shipped with the heater for complete details of heater
internal wiring. Label must be placed on the heater
cover(s) per Step 3 on page 33.
Fig. 37 — Heater Slide Track Installation
Fig. 38 — Restrictor Plate
Mounting Screws
Heater Slide Track
Restrictor Plate
20 GA. GALV.
20 GA. GALV.
This view shown
without controls
for clarity
3.27
Restrictor Plate
7.17
.79
.31
.92
6.20
7.17