Instruction manual

All units have 3 motor speed taps, except the FA4A 018 through 036. Low speed (red) is designed for mismatch outdoor unit applications. Medium
speed (blue) is designed for straight matched operations. High speed (black) is used with high external static duct systems of straight matched
systems.
PROCEDURE 4—REFRIGERANT TUBING
Use accessory tubing package or field-supplied tubing of refrigerant grade. Suction tube must be insulated. Do not use damaged, dirty, or
contaminated tubing because it may plug refrigerant flow-control device. ALWAYS evacuate the coil and field-supplied tubing before opening
outdoor unit service valves.
CAUTION: Solder with low temperature 430°F silver alloy solder and wrap a wet cloth around rear of fitting to prevent
damage to factory-made joints.
PROCEDURE 5—REFRIGERANT FLOW-CONTROL DEVICE
CAUTION: If using a TXV (FC4B factory installed) in conjunction with a reciprocating compressor, a compressor start
capacitor and relay are required. Consult outdoor unit pre-sale literature for start assist kit part no.
Replace piston if required. Check piston size shown on indoor unit rating plate to see if it matches required piston shown on outdoor unit rating
plate. If it does not match, replace indoor piston with piston shipped with outdoor unit. The piston shipped with outdoor unit is correct for any
approved indoor coil combination. (See Fig. 14.)
PROCEDURE 6—CONDENSATE DRAINS
Units are equipped with primary and secondary 3/4 in. FPT drain connections. Use a 3/4 in. glue joint with fittings provided for units with A-coils
in horizontal applications. It is recommended that PVC fittings be used on the plastic condensate pan. Do not over-tighten. Finger-tighten plus 1-1/2
turns.
Fig. 13—Fan Coil Fan Relay and Speed Tap Terminal
A94068
INSULATING CAP (2)
MOTOR SPEED
TAP LEADS
2 OR 3
COMMON YELLOW
FAN DECK
WRAPPER
SPEED TAP
TERMINAL
PCB
FAN RELAY
SINGLE SPADE
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