On units with a factory installed disconnect with pull-out removed, service and maintenance can be safely performed on only the load side of the
control package.
WARNING: Field wires on the line side of the disconnect found in the fan coil unit remain live, even when the pull-out
is removed. Service and maintenance to incoming wiring can not be performed until the main disconnect switch (remote to
the unit) is turned off. Failure to do so will result in electrical shock causing personal injury or death.
A.
Line Voltage Connections
FA4B units installed without electric heat require the use of a factory-authorized Power Plug Kit (KFAPP0125PLG). This kit provides the electrical
connections necessary to supply the FA4B unit with 230-v power when electric heat is not present. This kit is required only on those FA4B
applications which do not use electric heat.
For units without electric heat:
1. Connect 208/230v power leads from field disconnect to yellow and black stripped leads.
2. Connect ground wire to unit ground lug.
3. If unit contains 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.)
NOTE:
Units installed without electric heat should have a field-supplied sheet metal block-off plate covering the heater opening. This will reduce
air leakage and formation of exterior condensation.
B.
24-v Control System
CONNECTION TO UNIT
Wire low voltage in accordance with wiring label on the blower. (See Fig. 9, 10, 11, 12, and 14.) Use no. 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 ft from the unit (as measured along the low-voltage wire), use No. 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 any additional wiring procedure recommendations.
TRANSFORMER INFORMATION
Transformer is factory-wired for 230v operation. For 208v applications, disconnect the black wire from the 230v terminal on transformer and
connect it to the 208v terminal (See Fig. 15).
HEATER STAGING
CAUTION: 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. This relay is in kit Part No. KHAOT0201SEC and is
normally used with kit Part No. KHAOT0301FST for 2 outdoor thermostat system. Failure to follow this CAUTION could result
in minor personal injury or product and property damage.
The controls are factory circuited for single-stage operation. For 2-stage operation, use outdoor thermostat kit Part No. KHAOT0301FST, and for
3-stage use both kits Part No. KHAOT0201SEC and KHAOT0301FST.
When 2 stages are desired, cut W3 at the W2 wire nut, strip and reconnect per the thermostat kit instruction. (See Fig. 12.) When 3 stages are
desired, cut the W2 wire nut off and discard. Strip W2, W3, and E and reconnect per thermostat kit instructions (See Fig. 14).
NOTE:
When 3 stages are used or anytime the E terminal is not tied to W2, the emergency heat relay, part of outdoor kit Part No.
KHAOT0201SEC must be used.
Fig. 8—Fan Coil Printed-Circuit Board
A03010
®
®
CPC-E
94V
-0
LR40061
HSCI
5 AMP
C
T
G
R
SPT
K1
U1
R7
R9
R10
C8
C7
R2
R3
C3
R6
R11
C4
C6
C5
R8
R5
R4
Q1
C1
C2
F1
JW1
R1
Z1
D2
D1
NO
NC
FA
N
RELA
Y
C
C
—7—