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 to 500 microns
before opening outdoor unit service valves.
CAUTION: Braze with Sil-Fos or Phos-copper on copper to copper joints and wrap a wet cloth around rear of fitting
to prevent damage to TXV.
PROCEDURE 5—REFRIGERANT FLOW-CONTROL DEVICE
CAUTION: If using a TXV (FC4B factory installed) in conjunction with a single-phase 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. 15.) When changing piston, use a back-up wrench. Hand tighten hex nut, then tighten with wrench
1/2 turn. Do not exceed 30 ft-lbs.
PROCEDURE 6—CONDENSATE DRAINS
Units are equipped with primary and secondary 3/4 in. FPT drain connections. For proper condensate line installation see Fig. 1, 2, 4, 5, and 6.
To prevent property damage and achieve optimum drainage performance, BOTH primary and secondary drain lines should be installed and include
properly-sized condensate traps. (See Fig. 16.) Factory-approved traps are available (Kit No. KFAET0125ETK). Be sure to install plastic push-in
plugs in unused condensate drain fittings. It is recommended that PVC fittings be used on the plastic condensate pan. Do not over-tighten.
Finger-tighten plus 1-1/2 turns. Use pipe dope.
CAUTION: Shallow, running traps are inadequate and DO NOT allow proper condensate drainage. (See Fig. 17.)
Fig. 14—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
—9—
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