7
PROPERTY DAMAGE HAZARD
Failure to follow this caution may result in product or
property damage.
If a disconnect switch is to be mounted on unit, select a
location where drill or fastener will not contact electrical or
refrigerant components.
CAUTION
!
NOTE
:
Before proceeding with electrical connections, make
certain that supply voltage, frequency, and phase are as specified
on unit rating plate.
Be sure that electrical service provided by the utility is sufficient to
handle the additional load imposed by this equipment. See unit
wiring label for proper field high-- and low--voltage wiring. Make
all electrical connections in accordance with NEC and any local
codes or ordinances that may apply. Use copper wire only. The unit
must have a separate branch electric circuit with a field--supplied
disconnect switch located within sight from, and readily accessible
from the unit.
B. 24–V Control System Connections to Unit Printed--Circuit
Board (PCB)
Refer to unit wiring instructions for recommended wiring
procedures. Use No. 18 AWG color--coded, insulated (35
_
C
minimum) wires to make low--voltage connections between
thermostat and unit. If thermostat is located more than 100 ft (30m)
from unit (as measured along the low--voltage wires), use No. 16
AWG color--coded, insulated (35
_
C minimum) wires. PCB is
circuited for single--stage heater operation. When additional heater
staging is desired using outdoor thermostats or Intelligent Heat
Staging, remove Jumper J2 on PCB to enable staging.
Connect low--voltage leads to thermostat and outdoor unit. (See
Fig. 9, 10, 11, or 12.)
O/W2
Y1/W2
W/W1
G
R
W2
Y1
INDOOR CONTROL
FAN COIL
1-SPEED
AIR CONDITIONER
W1
G
C
Y
C
DHUM
HUM
B
S1
S2
Y/Y2
R
O
C
DH
HEAT STAGE 2
N/A
HEAT STAGE 1
COOL STAGE 1
FAN
24 VAC HOT
24 VAC COMM
DEHUMIDIFY
HUMIDIFY
N/A
OUTDOOR
SENSOR
CONNECTION
Y/Y2
HUMIDIFIER
(24 VAC)
OUTDOOR
SENSOR
REMOVE J2 JUMPER
FOR HEAT STAGING
REMOVE
J1 JUMPER
FOR
DEHUMIDIFY
MODES
A98477
Fig. 9 -- FV4C Fan Coil Wiring with 1--Speed Air Conditioner
O/W2
W/W1
Y1/W2
G
R
W2
W1
INDOOR CONTROL
FAN COIL
2-SPEED
AIR CONDITIONER
Y1
G
C
Y2
R
Y1
C
DHUM
HUM
B
S1
S2
Y/Y2
R
O
C
DH
HEAT STAGE 2
HEAT STAGE 1
COOL STAGE 1
COOL STAGE 2
FAN
24 VAC HOT
24 VAC COMM
DEHUMIDIFY
HUMIDIFY
N/A
OUTDOOR
SENSOR
CONNECTION
Y/Y2
HUMIDIFIER
(24 VAC)
OUTDOOR
SENSOR
REMOVE J2 JUMPER
FOR HEAT STAGING
REMOVE
J1 JUMPER FOR
DEHUMIDIFY
MODES
A98478
Fig. 10 -- FV4C Fan Coil Wiring with 2--Speed
Air Conditioner
O/W2
W/W1
Y1/W2
G
R
O
W2
INDOOR CONTROL
FAN COIL
1-SPEED
HEAT PUMP
W1
G
C
Y
R
W2
O
C
DHUM
HUM
B
S1
S2
Y/Y2
R
Y1
C
DH
HEAT STAGE 3
HEAT STAGE 2
HEAT/COOL
STAGE 1
RVS COOLING
FAN
24 VAC HOT
24 VAC COMM
DEHUMIDIFY
HUMIDIFY
RVS HEATING
OUTDOOR
SENSOR
CONNECTION
Y/Y2
HUMIDIFIER
(24 VAC)
OUTDOOR
SENSOR
REMOVE J2 JUMPER
FOR HEAT STAGING
REMOVE
J1 JUMPER FOR
DEHUMIDIFY
MODES
A98475
Fig. 11 -- FV4C Fan Coil Wiring with 1--Speed Heat Pump
FV4
C