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NOTE: When connecting condensate drain lines, avoid blocking filter access panel, preventing filter removal. Prime both primary and secondary
condensate traps after connecting to drain pan.
NOTE: If the unit is located in or above a living space where damage may result from condensate overflow, a field-supplied, external condensate
pan should be installed underneath the entire unit, and a secondary condensate line (with appropriate trap) should be run from the unit into the
pan. Any condensate in this external condensate pan should be drained to a noticeable place. As an alternative to using an external condensate pan,
some localities may allow the use of a separate 3/4 in. condensate line (with appropriate trap) to a place where the condensate will be noticeable.
The owner of the structure must be informed that when condensate flows from the secondary drain or external condensate pan, the unit requires
servicing or water damage will occur.
Install traps in the condensate lines as close to the coil as possible. (See Fig. 18.) Make sure that the outlet of each trap is below its connection
to the condensate pan to prevent condensate from overflowing the drain pan. Prime all traps, test for leaks, and insulate traps if located above a
living area.
Condensate drain lines should be pitched downward at a minimum slope of 1 in. for every 10 ft of length.
Consult local codes for additional restrictions or precautions.
PROCEDURE 7—ACCESSORIES
A. Electronic Air Cleaner
The Electronic Air Cleaner may be connected to the fan coil as shown in Fig. 19. This method requires a field supplied transformer. Consult
electronic air cleaner literature for kit requirements.
B. Humidifier
Connect humidifier and humidistat to the fan coil unit as shown in Fig. 20 and Fig. 21. The cooling lockout relay is optional (See Fig. 22.)
→
PROCEDURE 8—SEQUENCE OF OPERATION
A. Continuous Fan
Thermostat closes R to G. G energizes fan relay on PCB which completes circuit to indoor blower motor. When G is de-energized, there is a 90
sec delay before relay opens.
B. Cooling Mode
Thermostat energizes R to G, R to Y, and R to O (heat pump only). G energizes fan relay on PCB which completes circuit to indoor blower motor.
When G is de-energized, there is a 90 sec delay before fan relay opens.
C. Heat Pump Heating Mode
Thermostat energizes R to G and R to Y. G energizes fan relay on PCB which completes circuit to indoor blower motor. When G is de-energized,
there is a 90 sec delay before fan relay opens.
D. Heat Pump Heating with Auxiliary Electric Heat
Thermostat energizes R to G, R to Y, and R to W. G energizes fan relay on PCB which completes circuit to indoor blower motor. W energizes
electric heat relay(s) which completes circuit to heater element(s). When W is de-energized, electric heat relay(s) opens turning off heater elements.
When G is de-energized there is a 90 sec delay before fan relay opens.
E. Electric Heat or Emergency Heat Mode
Thermostat closes R to W. W energizes electric heat relay(s) which completes circuit to heater element(s). Blower motor is energized through
normally closed contacts on fan relay. When W is de-energized, electric heat relay(s) opens turning off heater elements. Blower motor is
de-energized after heater relay(s) opens.
BRASS
HEX NUT
STRAINER
Fig. 15—Refrigerant Flow-Control Device (FC4B Has TXV and Strainer)
TEFLON SEAL
PISTON
DISTRIBUTOR
PISTON
BRASS
RETAINER
HEX BODY
—10—
A94415
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