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Specifications subject to change without notice.
421 01 5501 05 7
Use furnace transformer, fan coil transformer, or accessory
transformer for control power, 24v/40va minimum.
NOTE: Use of available 24v accessories may exceed the
minimum 40va power requirement. Determine total
transformer loading and increase the transformer capacity or
split the load with an accessory transformer as required.
Final Wiring Check
IMPORTANT: Check factory wiring and field wire
connections to ensure terminations are secured properly.
Check wire routing to ensure wires are not in contact with
tubing, sheet metal, etc.
Compressor Crankcase Heater
When equipped with a crankcase heater, furnish power to
heater a minimum of 24 hr before s tarting unit. To furnish
power to heater only, set thermostat to OFF and close
electrical disconnect to outdoor unit.
A crankcase heater is required if refrigerant tubing is longer
than 80 ft. (24.38 m). Refer to the Long Line Application
Guideline.
Install Electrical Accessories
Refer to the individual instructions packaged with kits or
accessories when installing.
Start- Up
CAUTION
!
UNIT OPERATION AND SAFETY HAZARD
Failure to follow this caution may result in personal injury,
equipment damage or improper operation.
S Do not overcharge system with refrigerant.
S Do not operate unit in a vacuum or at negative
pressure.
S Compressor dome temperatures may be hot.
CAUTION
!
PERSONAL INJURY HAZARD
Failure to follow this caution may result in personal
injury.
Wear safety glasses, protective clothing, and gloves
when handling refrigerant and observe the following:
S Front seating service valves are equipped with
Schrader valves.
Follow these steps to properly start up system:
1. After system is evacuated, fully open liquid and vapor
service valves.
2. Unit is shipped with valve stem(s) front seated (closed)
and caps installed. Replace stem caps after system is
opened to refrigerant flow. Replace caps finger- tight
and tighten with wrench an additional 1/12 turn.
3. Close electrical disconnects to energize system.
4. Set room thermostat at desired temperature. Be sure
set point is below indoor ambient temperature.
5. Set room thermostat to COOL and fan c ontrol to ON or
AUTO mode, as desired. Operate unit for 15 minutes.
Check system refrigerant charge.
3- Phase Monitor
In 3- phase units a small circuit board is factory installed to
monitor line voltage. A small led will flash if a phase problem
exists. See code descriptions on monitor. If LED is flashing,
disconnect power to unit and interchange 2 field- wiring leads
on unit c ontactor.
A00010
Fig. 6 - 3- Phase Monitor Control
(Applies to 3- Phase Units Only)
Table 5 – Three- Phase Monitor LED Indicators
LED STATUS
OFF Nocallforcompressoroperation
FLASHING Reversed phase
ON Normal
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
Ensure compressor rotation is correct.
S 3- phase scroll compressors are rotation sensitive.
S A flash LED on phase monitor indicates reverse
rotation. (See Table 5)
This will not allow contactor to be energized.
S Disconnect power to unit and interchange 2
field- wiring leads on unit contactor.
CAUTION
!
Sequence of Operation
Turn on power to indoor and outdoor units. Transformer is
energized.
On a call for cooling, thermostat makes circuits R- Y and
R- G. Circuit R- Y energizes contactor, starting outdoor fan
motor and compressor circuit. R- G energizes indoor unit
blower relay, starting indoor blower motor on high speed.
When thermostat is satisfied, its contacts open,
de- energizing contactor and blower relay. Compressor and
motors stop.
If indoor unit is equipped with a time- delay relay circuit, the
indoor blower will run an additional 90 seconds to increase
system efficiency.
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