Installation guide
Table 1--Refrigerant Connections and Recommended Liquid and Vapor Tube Diameters (in.)
LIQUID VAPOR
UNIT SIZE Connect Tube Connect Tube
Diameter Diameter Diameter Diameter
018, 024 3/8 3/8 3/8 5/8
030, 036 3/8 3/8 3/8 3/4
042-048 3/8 3/8 7/8 7/8
060 3/8 3/8 7/8 1-1/8
Note: Tube diameters are for lengths up to 60 ft. For tubing lengths greater than 60 ft, consuR your IocN distributor or Long-Line Application Guideline.
C. Connect Control Wiring
Route 24-v control wires through control wiring grommet and connect leads to control wiring. (See Fig. 5.) Use No. 18 AWG color*coded,
insulated (35°C minimum) wire. if themlostat is located more than I00 ft from unit, as measured along the control voltage wires, use No. 16 AWG
color coded wire to avoid excessive voltage drop.
Use furnace transformer, f_ancoil transfomler, or accessory transformer for control power, 24-v/40*va minimum.
NOTE: Use of available 24-v accessories may exceed the minimum 40*va power requirement. Determine total transformer loading and increase
the transformer capacity or split the load with an accessory transformer as required.
PROCEDURE 8--COMPRESSOR CRANKCASE HEATER
A crankcase heater is required if refrigerant tubing is longer than 50 It.
PROCEDURE 9iINSTALL ELECTRICAL ACCESSORIES
Refer to the individual instructions packaged with kits or accessories when installing.
PROCEDURE 10iSTART*UP
CAUTION:
• 3*phase scroll compressors are rotation sensitive.
• A flashing LED on phase monitor indicates reverse rotation. (See Fig. 4 and Table 2.)
• This will not allow contactor to be energized.
• Disconnect power to unit and interchange 2 field wiring leads on unit contactor.
I. When equipped with a crankcase heater, energize heater a minimum of 24 hr before starting unit. To energize heater only, set thermostat
to OFF mode and close electrical disconnect to outdoor unit.
CAUTION: Service valve gage ports are equipped with Schrader valves. To prevent personal injury, wear safety
glasses and gloves when handling refrigerant.
2. Fully back seated (open) liquid and vapor service valves.
3. Unit is shipped with valve stem(s) front seated (closed), and caps installed. Replace stem caps after system is opened to refi-igerant flow.
Replace caps finger-tight and tighten additional 1/6 turn with wrench.
4. Close electrical disconnects to energize system.
5. Set room thermostat at desired temperature. Be sure set point is below indoor ambient temperature.
6. Set room thermostat at COOL and fan ON or AUTO modes, as desired. Operate unit for 15 minutes. Check system refrigerant charge. See
Check Charge section.
WARNING: Relieve pressure and recover all refrigerant before system repair or final unit disposal to avoid personal
injury or death. Use all service ports and open all flow control devices, including solenoid valves.
A. 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. On three phase models with scroll compressors, the units are equipped with a phase
monitor to detect if the incoming power is correctly phased for compressor operation. (See Fig. 4 and Table 2.)if the phasing is correct, 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.
NOTE: if the phasing is incorrect, the contactor will not be energized. To correct the phasing, interchange any two of the three power connections
on the field side.
When thermostat is satisfied, its contacts open, de-energizing contactor and blower relay. Compressor and motors stop.
if indoor unit is equipped with an off delay circuit, the indoor blower can run up to an additional 120 sec to increase system efficiency.
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