HEIL FEM4X Installation Instructions Manual page 8

INSTALLATION INSTRUCTIONS
A. LINE VOLTAGE CONNECTIONS
Fan Coils installed without electric heat require the use of a
factory−authorized Power Plug Kit (accessory part number
EBAC01PLG). This kit provides the electrical connections
necessary to supply the unit with 208/230V power when
electric heat is not present. For units without electric heat:
1. Connect 208/230V power leads from field disconnect
to yellow and black stripped leads on Power Plug
(accessory part number EBAC01PLG).
2. Connect ground wire to unit ground lug.
3. When installing an electric heater, remove and
discard power plug (if equipped) from fan coil and
connect male plug from heater to female plug from
unit wiring harness. (See Electric Heater Installation
Instructions.)
B. 24V CONTROL SYSTEM
Connection to Unit
Wire low−voltage in accordance with wiring label on the
blower (also refer to Figure 8 through Figure 13). Use 18
AWG color−coded, insulated (35 ° C minimum) wire to make
the low−voltage connections between the thermostat, the
unit, and the outdoor equipment. If the thermostat is located
more than 100 feet from the unit (as measured along the low
voltage wire), use 16 AWG color−coded, insulated (35 ° C
minimum) wire. All wiring must be NEC Class 1 and must be
separated from incoming power leads. Refer to outdoor unit
wiring instructions for additional wiring recommendations.
Heater Staging
The controls are factory circuited for single−stage operation
(refer to Figure 9). When 2 stages are desired, cut W3 at
the W2 wire nut, strip, and reconnect according to the
thermostat kit instruction (refer to Figure 11 − Outdoor
thermostat optional). When 3 stages are desired, cut the W2
wire nut off and discard. Strip W2, W3, and E, and reconnect
according to the thermostat kit instructions (refer to
Figure 12 − Outdoor thermostats optional).
CAUTION
!
UNIT OPERATION HAZARD
Failure to follow this caution may result in improper
product operation.
If W2, W3, and E on any 3−stage heater (18, 20, 24, or
30kW) are individually connected − as with outdoor
thermostats or any other situation − emergency heat relay
must be used. If relay is not used, blower may not operate
when heaters are energized.
Manufactured Housing
In manufactured housing applications, the Code of Federal
Regulations, Title 24, Chapter XX, Part 3280.714 requires
that supplemental electric heat be locked out at outdoor
8
temperatures above 40_F (4_C), except for a heat pump
defrost cycle. Refer to Figure 13 for typical low−voltage
wiring with outdoor thermostat.
Figure 8
Figure 9
Figure 10
Specifications are subject to change without notice.
Fan Coils: FEM4X, FEM4P, REM4X
Wiring Layout − Air Conditioning
Unit (Cooling Only)
FAN COIL
THERMOSTAT (CONTROL)
RED
R R
GRY
G G
WHT
W W
2
WHT
BLU
W
3
VIO
E
BRN
C
Y
Wiring Layout − Air Conditioning
Unit (Cooling and 1−Stage Heat)
FAN COIL
THERMOSTAT
(CONTROL)
RED
R R
GRY
G G
WHT
W W
2
WHT
BLU
W
3
VIO
E
BRN
C
Y
Wiring Layout − Heat Pump Unit
(Cooling and 2−Stage Heat with No
Outdoor Thermostat)
FAN COIL
THERMOSTAT (CONTROL)
RED
R R
GRY
G G
BRN
C
C
WHT
W W
2 2
BLU
W
3
E
VIO
E
L
O
Y
AIR COND.
C
Y
AIR COND.
C
Y
HEAT PUMP
(CONTROL)
R
C
W
2
O
Y
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