EHK Installation Manual

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Specifications are subject to change without notice
ATTACH FUSE BOX OR CIRCUIT BREAKER BOX
1. For 15kW and 20kW fused models:
After installing heater assembly, attach fuse assembly to
side of fan coil unit by inserting fuse box tab between in-
sulation and to left side of unit and fan deck. Mount front
of assembly to side flange with two (2) screws provided.
On fan coil units size 4200 and larger, remove wire tie that
shortens wire length between heater and fuses. Fuse
cover is closed by engaging dimples in fuse box. (See
Figure 2)
2. For 24kW and 30kW fused models:
Fuse assembly is mounted on heater. Be sure fuse cover
is closed by engaging clip latch on unit top panel. (See
Figure 1)
ELECTRICAL SHOCK.
Failure to follow this warning could result in death
and/or personal injury.
Close fuse box before power is turned to ON
position.
!
WARNING
3. For 5kW through 20kW circuit breaker models:
After installing heater assembly, attach circuit breaker as-
sembly to unit with screws provided. (See Figure. 3) On
fan coil units size 4200 and larger, remove wire tie that
shortens wire length between heater and circuit breaker
assembly to allow mounting of circuit breaker assembly.
(See Figure 3)
4. Circuit breaker models require installing a bezel in unit
door to provide safe access to circuit breakers. Bezel
mounts on inside of blower door. (See Figure 4)
Figure 2 Fused Model Installation
a. Cut insulation away from access hole in blower access
panel. Slide bezel flanges under insulation. Lip on bezel
must protrude inward toward unit.
b. Secure bezel to panel with two (2) No. 6 hex head screws.
Insert screws through original cover plate holes on ac-
cess panel and drive into engagement holes on bezel
flanges.
ELECTRICAL CONNECTIONS
Refer to unit instructions for recommended wiring proce-
dures. Install wiring in accordance with all applicable local
and national codes.
Connect heater wiring harness plug to receptacle on fan
control board or wire harness. A positive connection must be
made between plug and receptacle. Plug will interlock with
receptacle when properly seated. Harness contains both
24V control and high−voltage wiring. Blower power is pro-
vided through heater harness.
NOTE: Units with or without electric heaters require a mini-
mum 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 high-
er of the two for year−round operation.
Figure 3 Circuit Breaker Model Installation
A. Wire 24V Control Systems
1. Connections to unit
Use No. 18 AWG color−coded, insulated (35 Deg. C mini-
mum) wire to make low−voltage connections between
thermostat, fan coil unit, and outdoor unit. If thermostat is
located more than 100 ft. from unit (as measured along
the low−voltage wire), use No. 16 AWG color−coded, in-
sulated (35 Deg. C minimum) wire. All wiring must be sep-
arated from line voltage power leads. Refer to outdoor
unit wiring instructions for additional wiring procedure rec-
ommendations.
2. Transformer
Transformer is factory wired for 230V operation. For 208V
applications, disconnect black wire on transformer 230V
terminal and reconnect it to 208V terminal. (See Figure 5)
The secondary circuit of transformer is protected by a
5−amp fuse mounted on fan control board.