Step 7—Install Electrical Accessories, If Any
Refer to the individual instructions packaged with the kit or
accessory when installing.
Step 8—Start-Up and Check Charge
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.
• Do not disable low-pressure switch.
In scroll compressor applications:
• Dome temperatures may be hot.
To prevent personal injury wear safety glasses, protective
clothing, and gloves when handling refrigerant and observe
the following:
• Back seating service valves are not equipped with Schrader
valves. Fully back seat (counter clockwise) valve stem before
removing gage port cap.
• Front seating service valves are equipped with Schrader
valves.
Do not vent refrigerant to atmosphere. Recover during system
repair or final unit disposal.
1. Fully back seat (open) liquid and vapor tube service valves.
2. Unit is shipped with valve stem(s) front seated and caps
installed. Replace stem caps after system is opened to refrig-
erant flow (back seated). Replace caps finger-tight and tighten
additional 1/6 turn with wrench.
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 to ON or AUTO mode,
as desired. Operate unit for 15 minutes. Check system
refrigerant charge.
6. Factory charge is shown on unit rating plate. Adjust charge by
following procedure shown on charging tables located on unit.
• 3-phase scroll compressors are rotation sensitive.
• A flashing LED on phase monitor indicates reverse rotation.
(See Fig. 6 and Table 3.)
• This will not allow contactor to be energized.
• Disconnect power to unit and interchange 2 field wiring
leads on unit contactor.
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. 5 and Table 2.) If the
phasing is correct, circuit R-Y energizes contactor, starting out-
door 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.
Fig. 3—Piping Installation
A94330
INSULATION
VAPOR TUBE
LIQUID TUBE
OUTDOOR WALL INDOOR WALL
LIQUID TUBE
VAPOR TUBE
INSULATION
CAULK
Avoid contact between tubing and structure.NOTE:
THROUGH THE WALL
HANGER STRAP
(AROUND VAPOR
TUBE ONLY)
JOIST
1″ MIN
(25 mm)
SUSPENSION
Fig. 4—Line Power Connections
A96650
FIELD POWER
WIRING
DISCONNECT PER
IEC AND/OR
LOCAL CODES
N FOR 1-PHASE ONLY
3-PHASE ONLY
CONTACTOR
L1
L2/N
L3
PE
L1
L2/N
L3
PE
GROUND
LUG
Table 2—Phase Monitor LED Indicators
LED STATUS
OFF No call for compressor operation
FLASHING Reversed phase
ON Normal
4
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