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Manual 2100-399
Page 11
WIRING — MAIN POWER
Refer to the unit rating plate for wire sizing
information and maximum fuse or “HACR" type
circuit breaker size. Each outdoor unit is marked
with a “Minimum Circuit Ampacity”. This means
that the field wiring used must be sized to carry
that amount of current. Depending on the installed
KW of electric heat, there may be two field power
circuits required. If this is the case, the unit serial
plate will so indicate. All models are suitable only
for connection with copper wire. Each unit and/or
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.
Nine (9) wires should be run from thermostat subbase to
the 24V terminal board in the unit. A nine conductor, 18
gauge copper, color-coded thermostat cable is
recommended. The connection points are shown in
Figure 7.
IMPORTANT NOTE:
Only the thermostat and subbase combinations as shown at
the right will work with this equipment. The thermostat and
subbase must be matched and the correct operation can be
assured only by proper selection and application of these
parts.
Note 1: 1F93-380 thermostat must be set to "Heat Pump"
mode to operate properly.
Press the program"RUN" button to make sure the
thermostat is in run program model.
Press time "FWD" and "BACK" at the same time to
enter User Configuration Menu.
Press and hold set "TIME" and "DAY" for about
3 seconds to enter Installer Menu.
The thermostat will display "MULTI STG"
Press the "UP" or "DOWN" button until the display
reads "HEAT PUMP"
Press program "RUN" button to resume operation.
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).
The electrical data lists fuse and wire sizes
(75ºC copper) for all models, including the
most commonly used heater sizes. Also shown
are the number of field power circuits required
for the various models with heaters.
The unit rating plate lists a “Maximum Time
Delay Relay Fuse” or “HACR" type 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.
See Start-up section for information on three
phase scroll compressor start-ups.
WIRING — LOW VOLTAGE WIRING
230/208V, 1 phase and 3 phase equipment 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:
paTegnaR
042
802
612-352
781-022
MIS-440
FIGURE 7
UNIT 24V TERMINAL BOARD
See Note 1
FACTORY JUMPER