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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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