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wiring diagram will be marked "Use Copper Conductors
Only". These instructions must be adhered to. Refer
to the National Electrical Code (NEC) for complete
current carrying capacity data on the various insulation
grades of wiring material. All wiring must conform to
NEC and all local codes.
The electrical data lists fuse and wire sizes (75° C
copper) for all models.
The unit rating plate lists a "Maximum Time Delay
Relay Fuse" or circuit breaker that is to be used with
the equipment. The correct size must be used for
proper circuit protection and also to assure that there
will be no nuisance tripping due to the momentary high
starting current of the compressor motor.
The disconnect access door on this unit may be locked
to prevent unauthorized access to the disconnect. To
convert for the locking capability bend the tab located
in the bottom left hand corner of the disconnect
opening under the disconnect access panel straight
out. This tab will now line up with the slot in the door.
When shut, a padlock may be placed through the hole
in the tab preventing entry.
WARNING
Failure to provide an electrical power supply
shut off means could result in electric shock or
fire.
Electrical Grounding
When installed, the furnace must be electrically
grounded in accordance with local codes, or in the
absence of local codes, with the National Electrical
Code, ANSI/NFPA 70 or Canadian Electrical Code,
CSA22.1, latest edition. Use a copper wire from green
ground wire on the furnace to a grounded connection
in the service panel or a properly driven and electrically
grounded ground rod. See Tables 1A and 1B for proper
ground wire size.
WARNING
Failure to provide a proper electrical ground
could result in electric shock or fire.
Field-Installed Equipment
Wiring to be done in the field between the furnace
and devices not attached to the furnace, or between
separate devices which are field installed and located,
shall conform with the temperature limitation for
Type T wire {63° F rise (36° C)} when installed in
accordance with the manufacturer's instructions.
Installation of Flexible Conduit Through Return Air
Opening
NOTE: To allow proper clearance between the control
panel and any vent options, 90° conduit
fittings must be used on the back of the
control panel.
Installing Conduit (See Figure 10)
1. Remove conduit access panel if required to gain
access to area behind control panel.
2. Remove low voltage and high voltage knockouts
located in rear of control panel.
3. Run low voltage conduit through 7/8 bushing
located in conduit entrance plate and secure to low
voltage opening in rear of control panel.
4. Run high voltage conduit through 1-3/4 bushing
located in conduit entrance plate and secure to
high voltage opening in rear of control panel.
5. Replace conduit access panel if required to
complete installation.
6. Seal around conduit in conduit entrance plate.
FIGURE 10
Installation of Flexible Conduit
16. WIRING – LOW VOLTAGE WIRING
230/208 Volt Units
All 230/208V 1 phase and 3 phase equipment have
dual primary voltage transformers. All equipment leaves
the factory wired on 240V tap. For 208V operation,
reconnect from 240V to 208V tap. The acceptable
operating voltage range for the 240 and 208V taps are:
Tap: 240
Range: 253 – 216
Tap: 208
Range: 220 – 187
NOTE: The voltage should be measured at the field
power connection point in the unit and while
the unit is operating at full load (maximum
amperage operating condition).
Manual 2100-721B
Page
21 of 54
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