Instruction manual

C. Ground Connections
WARNING: According to NEC, ANSI/NFPA 70, and local codes, the cabinet must have an uninterrupted or unbroken
ground to minimize personal injury if an electrical fault should occur. The ground may consist of electrical wire or metal
conduit when installed in accordance with existing electrical codes. Failure to follow this warning could result in electric
shock, fire, or death.
Use UL-listed conduit and conduit connector for connecting supply wire(s) to unit to obtain proper grounding. Grounding may also be
accomplished by using grounding lugs provided in control box.
D. Minimum CFM and Motor Speed Selection
Units with or without electric heaters require a minimum CFM. Refer to the unit wiring label to ensure that the fan speed selected is not lower
than the minimum fan speed indicated.
Fan speed selection is done at the fan relay on the printed-circuit board. To change motor speeds, disconnect the fan lead used on the relay terminal
(SPT) and replace with the motor speed tap desired. (See Fig. 13.) Save the insulating cap and place on the motor lead removed from the relay.
NOTE: In low static applications, lower motor speed tap should be used to reduce possibility of water being blown off coil.
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.
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
—8—