Carrier FZ4A Installation Instructions Manual page 5

WARNING
!
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury
or death.
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 cannot be
performed until the main disconnect switch (remote to the
unit) is turned off.
A. Line Voltage Connections
If unit will contain accessory electric heater, remove and discard power
plug from fan coil and connect male plug from heater to female plug
from unit wiring harness. (See Electric Heater Installation Instructions.)
For units without electric heater:
1. Connect 208/230v power leads from field disconnect to yellow
and black stripped leads.
2. Connect ground wire to unit ground lug.
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. 8 through 12.) 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 (30 m) 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.
Fig. 8 - Wiring Layout Single- Stage Air Conditioning Unit
Fig. 9 - Wiring Layout Single- Stage Heat Pump Unit
Fig. 10 - Wiring Layout Two- Stage Air Conditioning Unit
Fig. 11 - Wiring Layout Two- Stage Heat Pump
THERMOSTAT
R
G
C
W
2
E
A160008
L
O
Y
Fig. 12 - Wiring Layout Heat Pump Unit
(Cooling and 2- Stage Heat for Manufactured Housing)
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. 13.)
5
FAN COIL HEAT PUMP
(CONTROL)
(CONTROL)
R
G
C
W
2
W
3
E
ODTS
A160009
A160010
A16011
R
C
W
2
O
Y
A03088