506271-01
Page 7 of 14
Issue 0921
All wiring should be done in accordance with the
National Electrical Code, ANSI/NFPA No. 70 (latest
edition); Canadian Electrical Code Part 1, CSA C22.1
(latest edition); or local codes where they prevail.
Use
wiring with a temperature limitation of 75°C minimum. Run
the 208 or 230 volt, 60 hertz electric power supply through a
fused disconnect switch to the control box of the unit and
connect as shown in the wiring diagram located on the inside
of the control access panel.
Power supply to the unit must be N.E.C. Class 1, and must
comply with all applicable codes. A fused disconnect switch
should be field provided for the unit. The switch must be
separate from all other circuits. If any of the wire supplied
with the unit must be replaced, replacement wire must be of
the type shown on the wiring diagram. Electrical wiring must
be sized to carry minimum circuit ampacity marked on the
unit.
Use copper conductors only.
Each unit must be
wired with a separate branch circuit and be properly fused.
Thermostat
The room thermostat should be located on an inside wall where
it will not be subject to drafts, sun exposure, or heat from
electrical fixtures or appliances. Follow the manufacturer’s
instructions enclosed with thermostat for general installation
procedure. Color-coded insulated wires (#18 AWG) should
be used to connect the thermostat to the unit.
Four wires are required for cooling. The heat anticipator
setting is 0.75 amp.
When connecting electrical power and control wiring to
the unit, waterproof type connectors must be used so that
water or moisture cannot be drawn into the unit during
normal operation.
CAUTION
Compressor
Units are shipped with compressor mountings factory-
adjusted and ready for operation.
Caution: Do not loosen compressor mounting bolts.
LPG/Propane Units, Tanks, and Piping
Units are shipped equipped for natural gas, but can be
converted to LPG/propane in the field by an approved
licensed technician. If conversion is required, use the
approved conversion kit.
When converting a low NO
x
unit (designated by an L in the
model number) to propane,
the NO
x
inserts
must
be
removed
. After removing the burners, remove the screw
holding each insert and pull the insert from the combustion
chamber. The screws
must be reinstalled
in the vest panel
after the inserts are removed.
All LPG/propane gas equipment must conform to the safety
standards of the National Fire Protection Association.
For satisfactory operation, LPG/propane gas pressure must
be a minimum of 11" w.c. at the unit under full load.
Complete information regarding tank sizing for vaporization,
recommended regulator settings, and pipe sizing is available
from most regulator manufacturers and LPG/propane gas
suppliers.
Check all connections for leaks when piping is completed,
using a soapy solution.
Some soaps used for leak detection
are corrosive to certain metals. Carefully rinse piping
thoroughly after completing leak detection.
Electrical Wiring (See Figures 4 & 5)
Power Wiring
If 208 volt is supplied, transformer connections must be made.
Line Voltage 208/230 Volts
Figure 5
GROUND
LUG
CONTACTOR
FIELD-SUPPLIED
FUSED
DISCONNECT SINGLE
PHASE
POWER
SUPPLY
