Installation guide

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UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
Ensure compressor rotation is correct.
• 3-phase scroll compressors are rotation
sensitive.
• A flash LED on phase monitor indicates
reverse rotation. (See Fig. 9 and Table 3)
This will not allow contractor to be energized.
• Disconnect power to unit and interchange 2
fleld-wirin_ leads on unit contactor.
Connect Control Wiring
Route 24-v control wires through control wiring grommet and
connect leads to control wiring. Refer to Installation Instructions
packaged with thermostat (See Fig. 10)
Use No. 18 AWG color-coded, insulated (35°C minimum) wire.
If thermostat is located more than 100 ft. from unit, as measured
along the control voltage wires, use No. 16 AWG color-coded
wire to avoid excessive voltage drop.
All wiring must be NEC Class 1 and must be separated from
incoming power leads.
Use furnace transformer, fan coil transformer, or accessory
transfomaer for control power, 24v/40va minimum.
NOTE: Use of available 24v accessories may exceed the
minimum 40va power requirement. Determine total transfommr
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.
STEP 8 --Compressor Crankcase Heater
When equipped with a crankcase heater, furnish power to heater a
minimum of 24 hr before starting 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. Refer to the Application Guideline and Service Manual
Longline Section-Residential Split-System Air Conditioners and
Heat Pumps.
STEP 9 --Install Electrical Accessories
Refer to the individual instructions packaged with kits or
accessories when installing.
STEP 10 --Start-Up
UNIT OPERATION AND SAFETY HAZARD
Failure to follow this caution may result in minor personal
injury, equipment damage or improper operation.
To prevent compressor damage or personal injury, observe the
following:
• Do not overcharge system with refrigerant.
• Do not operate unit in a vacuum or at negative pressure.
• Dome temperatures may be hot.
• In 3 phase applications, incorrect phasing will cause reverse
rotation, resulting in elevated noise levels, equalized
pressures and reduced current draw. Correct by reversing
power connection L1 and L2 on contactor.
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:
• Front seating service valves are equipped with Schrader
valves.
ENVIRONMENTAL HAZARD
Failure to follow this caution may result in environmental
damage.
Federal regulations require that you do not vent refrigerant to
the atmosphere. Recover during system repair or final unit
disposal.
Follow these steps to properl_ start up s_stem:
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 control to ON or
AUTO mode, as desired. Operate unit for 15 minutes.
Check system refrigerant charge.
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.