Installation guide

LEGEND " @ 118
FLA -- Full LoadAmps
LRA -- Locked Rotor Amps b
MCA -- Minimum Circuit Amps
MOCP -- Maximum Overcurrent Protection
RLA -- Rated Load Amps
CKT BKR -- Circuit Breaker
NOTES:
1. In compliance with NEC (National Electrical Code) requirements
for multimotor and combination load equipment (refer to NEC
Articles 430 and 440), the overcurrent protective device for the
unit shall be Power Supply fuse. Canadian units may be
fuse or circuit breaker.
2. Minimum wire size is based on 60 C copper wire. If other than
60 C wire is used, or if length exceeds wire length in table,
determine size from NEC.
3. Unbalanced 3-Phase Supply Voltage
Never operate a motor where a phase imbalance in supply volt-
age is greater than 2%. Use the following formula to determine
the percentage of voltage imbalance.
% Voltage imbalance
= 100 x max voltage deviation from average voltage
average voltage
EXAMPLE: Supply voltage is 460-3_60,
A a C AB = 452 v
(_ BC = 464 v
AC = 455 v
Average Voltage = 452 + 464 + 455
3
= 1371
3
= 457
Determine maximum deviation from average voltage.
(AB) 457 452=5v
(B0) 464 457=7v
(AC) 457 455=2v
Maximum deviation is 7 v,
Determine percent of voltage imbalance.
% Voltage Imbalance = fog x !
457
= 1.53%
This amount of phase imbalance is satisfactory as it is below the
maximum allowable 2%.
3
IMPORTANT: If the supply voltage phase imbalance is J
more than 2%, contact your local electric utility company J
immediately.
J
C99024
Table 5--Legend
3. Make the following inspections:
a. Inspect for shipping and handling damages such as broken lines, loose parts, disconnected wires, etc.
b. inspect for oil at all refrigerant tubing connections and on unit base. Detecting oil generally indicates a refrigerant leak.
c. Leak test all refrigerant tubing connections using electronic leak detector, halide torch, or liquid-soap solution. If a refrigerant leak is
detected, see the Checkjbr Re[Hgerant Leaks section.
d. inspect all field- and factory-wiring connections. Be sure that connections are completed and tight.
e. Ensure wires do not contact refrigerant tubing or sharp sheet metal edges.
fi Inspect coil fins. If damaged during shipping and handling, carefully straighten fins with a fin comb.
4. Verify the following conditions:
CAUTION: Do not purge gas supply into the combustion chamber. Do not use a match or other open flame to check
for gas leaks. Failure to follow this warning could result in an explosion causing serious injury or death.
a. Make sure gas line is free of air. Before lighting the unit for the first time, perform the following with the gas valve in the "OFF'"
position: if the gas supply pipe was net purged before connecting the unit, it will be full of air. It is recommended that the ground joint
union be loosened, and the supply line be allowed to purge until the odor of gas is detected. Never purge gas lines into a combustion
chamber, immediately upon detection of gas odor, retighten the union. Allow 5 minutes to elapse, then light unit.
b. Make sure that condenser-fan blade is correctly positioned in fan orifice. Leading edge of condenser-fan blade should be 1/2 in.
maximum from fan orifice venturi.
c. Ensure fan hub is I/8 in. maximum from motor housing (See Fig. 12).
1
MOTOR AND FAN HUB MOTOR SHAFT
Fig. 12--Fan Blade Clearance
d. Make sure that air filter(s) is in place.
e. Make sure that condensate drain trap is filled with water to ensure proper drainage.
fi Make sure that all tools and miscellaneous loose parts have been removed.
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C99009