FED “B” Series: Installation Instructions & Homeowner’s Information
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
3
IMPORTANT: Make certain that the unit is level or pitched slightly
toward the front to ensure proper unit operation.
9. After the unit is installed, cover the top to prevent construction
debris from entering. Remove the covering after construction is
complete.
A180302A
Fig. 4 – Unit Placement
ELECTRICAL CONNECTIONS
These units do not have a printed circuit board (PCB), they have a low
voltage circuit protective fuse (3 amp) in-line on the wire harness. Speed
selections are made at the fan motor with the WHITE wire for electric
heat mode. The motor is pre-programmed with the time-delay circuit on
some of the speed taps. See Table 2.
Before proceeding with electrical connections, make certain that supply
voltage, frequency, phase, and circuit ampacity are as specified on the
unit rating plate. See unit wiring label for proper field high and low
voltage wiring.
NOTE: Circuit breakers in Series B units are mounted horizontally, and
factory supplied in the OFF position. When installed in the downflow
position, slide circuit breaker switch to the right to power the unit.
Line Voltage Connections
a. Units with 10kW heaters are wired for single-supply circuit only.
See Fig. 5.
b. Units with 12kW, 15kW and 20kW heaters are wired for
dual-supply circuits only. See Fig. 6. Run each circuit through
separate holes in the cabinet using the two high-voltage
knockouts provided.
c. Torque all connections to the specification listed on the breaker
body.
A00077A
Fig. 5 – 10 kW Circuit Breaker and Disconnect Heaters
A00079B
Fig. 6 – 12, 15 &20 kW Circuit Breakers
Thermostat Wiring
Connection to Unit
Wire thermostat in accordance with wiring label on the blower (also
refer to Fig. 7). Use minimum 22 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 18 AWG color-coded, insulated (35°C minimum)
wire. Refer to outdoor unit wiring instructions for additional wiring
recommendations.
WARNING
!
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury or death.
Turn off the main (remote) disconnect device before working on
incoming (field) wiring.
Incoming (field) wires on the line side of the circuit breaker found in
the fan coil unit remain live, even when the switch is in the OFF
position. Service and maintenance to incoming (field) wiring cannot be
performed until the main disconnect switch (remote to the unit) is
turned off.
Ground
Lug
Field
Power
Wiring
Field
Ground
Wiring
ON
OFF
L1
L2
Field Ground
Wiring
A - L1
A - L2
Field Ground
Wiring
B - L3
B - L4
Circuit A : L1-L2
Circuit B : L3-L4
ON
OFF
ON
OFF
Field Power Wiring
Ground Lug
Ground Lug
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