Instruction manual

b. For 15- and 20-kw fused heaters, an additional ground lug is provided on fuse mounting bracket for dual-circuit grounding. (See Fig.
1.)
10. Mode Selection
a. In some cases it is desirable for the PCB to operate in efficiency mode. This is accomplished by cutting jumper JW2. (See Fig. 2.) Jumper
JW2 is labeled. Cut jumper for high speed fan only. In this mode, the PCB only energizes the HI speed tap selection. With jumper JW2
cut, fan speed tap terminal LO becomes a dummy terminal.
b. In some instances when fan coil heater calls for a minimum speed selection of MED (blue) and desired cooling speed is MED (blue),
fan speed tap MED (blue) should be located on PCB fan terminal labeled HI, and JW2 jumper must be cut. Store unused fan taps on
terminals DUMMY and LO.
c. When 018 size fan coil unit is used on 208v, black speed tap must be connected to HI and JW2 must be cut.
11. Accessories
Use accessory kit Part No. KFAIR0101ACR to attach electronic air cleaner (EAC) or humidifier. (See Fig. 9.) Follow accessory kit
Installation Instructions.
PROCEDURE 5—ATTACH WIRING DIAGRAM AND RATING LABEL
1. Attach new wiring label to fan coil blower. Completely cover old wiring label. (See Fig. 12.)
2. Attach new heater rating label over existing electrical information rating label located on front access door of fan coil unit. (See Fig. 10.)
PROCEDURE 6—INSTALLATION VERIFICATION
1. After completion of heater installation, check to ensure proper connections and routings have been made.
2. Ensure all electrical covers are in place, and proper labels have been applied.
3. Reinstall blower access door before turning on unit power.
PROCEDURE 7—SMART HEAT OPERATION
A. Cooling
Smart Heat option controls the cooling mode in the same manner as conventional heat pumps are controlled. The fan has a 90 sec blower off delay
at the end of a cooling cycle.
B. Heat Pump Heating
Smart Heat option does not control heating in the conventional method. The PCB energizes the compressor 30 sec before the indoor fan is
energized. This allows the indoor coil to heat up eliminating cold-blow on start-up.
The electric heat is staged-on to allow continuous operation of heat pump and electric resistance heat below the balance point (below the point
where the heat pump cannot maintain dwelling temperature without supplemental heat) independent of outdoor thermostats.
Although the PCB has provisions for an outdoor thermostat, it is not needed for staging. On cycle down, indoor fan remains on 60 sec to recover
heat stored in indoor coil.
Fig. 4—System Wiring Diagram Using A Corporate Model Heat Pump Indoor Thermostat, With No Outdoor Thermostat
A97217
R
C
Y
G
O
W2D
W2T
W3
Y
0
R
C
O
W2
Y
INDOOR
CONTROL
BOARD
OUTDOOR
SPLICE
JW1
SINGLE-SPEED HEAT
PUMP DEFROST BOARD
R
C
Y/Y2
G
O/W2
W/W1
24 VAC HOT
24 VAC COMM
COOL / HEAT
STAGE 1
FAN
RVS COOLING
HEAT STAGE 2
MODEL HP
THERMOSTAT
—6—