PROCEDURE 2—ATTACH FUSE BOX OR CIRCUIT BREAKER BOX
1. For 15- and 20-kw fused models:
After installing heater assembly, attach fuse assembly to side of fan coil unit by inserting fuse box tab between insulation and to left side
of unit and fan deck. Mount front of assembly to side flange with 2 screws provided. On fan coil units size 042 and larger, remove wire
tie that shortens wire length between heater and fuses. Fuse cover is closed by engaging dimples in fuse box. (See Fig. 2.)
2. For 24- and 30-kw fused models:
Fuse assembly is mounted on heater. Be sure fuse cover is closed by engaging clip latch on unit top panel. (See Fig. 1.)
WARNING: Ensure fuse box is closed before power is turned to ON position. Electrical shock may cause personal
injury or death.
3. For 5- through 20-kw circuit breaker models:
After installing heater assembly, attach circuit breaker assembly to unit with screws provided. (See Fig. 3.) On fan coil units size 042 and
larger, remove wire tie that shortens wire length between heater and circuit breaker assembly to allow mounting of circuit breaker assembly.
(See Fig. 3.)
4. Circuit breaker models require installing a window bezel in unit door to provide safe access to circuit breakers. The Window Bezel mounts
on the outside of the blower door. (See Fig. 4.)
a. Cut insulation away from rectangular access hole in blower access panel.
b. Remove adhesive backing from window bezel and from the outside. Insert the window through the rectangular hole and seat firmly on
the door surface. Press firmly in place to seat the adhesive. (See Fig. 4.)
PROCEDURE 3—ELECTRICAL CONNECTIONS
Refer to unit instructions for recommended wiring procedures. Install wiring in accordance with all applicable local and national codes. (See Tables
3, 4, and 5.)
Connect heater wiring harness plug to receptacle on PCB or wire harness. A positive connection must be made between plug and receptacle. Plug
will interlock with receptacle when properly seated. Harness contains both 24-v control and high-voltage wiring. Blower power is provided through
heater harness.
NOTE:
Units with or without electric heaters require a minimum CFM. Refer to unit wiring label to ensure the fan speed selected with electric
heaters is equal to or greater than the minimum fan speed indicated. The minimum CFM for cooling is determined by the outdoor unit requirements.
Use the higher of the 2 for year-round operation.
Fig. 2—Installation of Fused Model Heater
A90151
DUAL-CIRCUIT
GROUND LUG
FUSE BOX
DIMPLE
FUSE BOX TAB
SINGLE-CIRCUIT
GROUND LUG
INSERT FUSE
BOX TAB HERE
COVER PLATE
OR
KNOCKOUT
FUSE COVER
WIRE TIE
(REMOVE ON
LARGE FAN COILS)
HEATER/CUTOUT
COVER
—3—
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