506941-01
Page 7 of 16
Issue 1148
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 fi xtures 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. For thermostat wire runs up to 60 feet (18 m), use 18
gauge wire. For 60 to 90 feet (18 to 27 m) runs, use 16
gauge wire.
Four wires are required for cooling. The heat anticipator
setting is 0.75 amp.
Compressor
Units are shipped with compressor mountings factory-
adjusted and ready for operation.
LPG/Propane Units, Tanks, and Piping
Units are shipped equipped for natural gas, but can be
converted to LPG/propane in the fi eld 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 6 & 7)
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 fi eld 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.
Do not loosen compressor mounting bolts.
CAUTION
Power Wiring
If 208 volt is supplied, transformer connec
Ɵ
ons must be made.
Figure 7
Line Voltage 208/230 Volts (- T Models)
460 Volts (- F Models)
FIELD-SUPPLIED
FUSED
DISCONNECT
CONTACTOR
GROUND
LUG
THREE
PHASE
POWER
SUPPLY
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
