Cfm Range For Fk4C Units; Electric Heat Heating Mode; Connect Refrigerant Tubing - Carrier FK4C Installation And Start-Up Instructions Manual

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Table Of Contents

Table of Contents

FAN COIL SIZE

FK4CNF001

FK4CNF002

FK4CNF003

FK4CNF005

FK4CNB006

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.

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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.

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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.

Table 1–CFM Range for FK4C Units

SYSTEM SIZES