Table 1–CFM Range for FK4C Units
FAN COIL SIZE
SYSTEM SIZES
CFM RANGE
FK4CNF001
018, 024, 030, 036
450-1275
FK4CNF002
018, 024, 030, 036
450-1275
FK4CNF003
024, 030, 036, 042
525-1475
FK4CNF005
030, 036, 042, 048
550-1700
FK4CNB006
036, 042, 048, 060
550-2150
A.
Continuous Fan
1. Thermostat closes circuit R to G
The blower runs at continuous fan airflow.
B.
Cooling Mode — Single speed or 2-speed high
1. Thermostat closes circuits R to G, R to Y/Y2 and R to O
The fan coil delivers single speed cooling airflow.
2. Thermostat closes circuits R to G, R to Y1, R to Y2 and R to O
The fan coil delivers 2-speed high cooling airflow.
C.
Cooling Mode — 2-speed low
1. Thermostat closes circuits R to G, R to Y1 and R to O
The fan coil delivers 2-speed low cooling airflow.
D.
Cooling Mode — Dehumidification
1. Thermostat or thermidistat closes circuits R to G, R to O, and R to Y/Y2 (or Y to Y1 for 2-speed low), and humidistat or thermidistat opens
R to DH
The fan coil delivers airflow which is approximately 80 percent of the nominal cooling airflow to increase the latent capacity of the system.
E.
Cooling Mode — Super Dehumidify Operation
NOTE:
The indoor control used, such as a thermidistat, must be capable of providing Super Dehumidify operation mode and control must be
configured as outlined in its installation instructions. Consult indoor control literature to determine if control is capable and for configuration
instructions.
1. Thermidistat closes circuit R to O, opens circuit R to DH, and cycles circuits R to G and R to Y/Y2 on and off
The fan coil delivers airflow which maximizes latent heat removal of system when operated for dehumidification at temperatures below the
indoor temperature setpoint. (See indoor control literature for details.)
F.
Electric Heat Heating Mode
1. Thermostat closes circuit R to W/W1, or W2
The fan coil delivers the selected electric heat airflow.
G.
Heat Pump Heating Mode — Single speed or 2-Speed High
1. Thermostat closes circuits R to G and R to Y/Y2
The fan coil delivers single speed heat pump heating airflow.
2. Thermostat closes circuits R to G, R to Y1 and R to Y/Y2
The fan coil delivers 2-speed high heat pump heating airflow.
H.
Heat Pump Heating Mode — 2-speed low
1. Thermostat closes circuits R to G and R to Y1
The fan coil delivers 2-speed heat pump heating low airflow.
I.
Heat Pump Heating with Auxiliary Electric Heat
1. Thermostat closes circuits R to G, R to Y/Y2 and/or R to Y1 with R to W/W1 or W2 (and R to O in the case of defrost)
In the event that electric heating is called for by the thermostat while the heat pump is also operating in either heating or defrost modes, the motor
will modify its airflow output, if necessary, to provide an airflow which is defined as safe for the operation of the electric heater during heat pump
operation. That airflow is the greater of the heat pump heating airflow and the greater of the electric heater only airflow.
PROCEDURE 6—CONNECT REFRIGERANT TUBING
See Dimensional Drawing for tube connection sizes, type, and locations. Use accessory tubing package or field-supplied tubing of refrigerant
grade. Insulate entire suction tube if field-supplied tubing is used. Tubing package has an insulated suction tube. Do not use damaged, dirty, or
contaminated tubing because it may plug refrigerant flow control device. When tubing package is used and sweat connections are made within
60 sec, coil and tubing system does not require evacuation. Always evacuate if field-supplied tubing is used.
CAUTION: A brazing shield MUST be used when tubing sets are being brazed to the unit connections to prevent
damage to the unit surface.
CAUTION: To prevent damage to thermostatic expansion valve, remove sensor bulb from vapor tube while brazing or
soldering vapor connections.
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