START-UP
Using the Start-Up Checklist supplied at the end of this book,
proceed as follows:
Step 1—Check for Refrigerant Leaks
Locate and repair refrigerant leaks and charge the unit as follows:
1. Use both high- and low-pressure ports to relieve system
pressure and reclaim remaining refrigerant.
2. Repair leak following accepted practices.
NOTE:
Install a bi-flow filter drier whenever the system has been
opened for repair.
3. Check system for leaks using an approved method.
4. Evacuate refrigerant system and reclaim refrigerant if no
additional leaks are found.
5. Charge unit with R-410A refrigerant, using a volumetric-
charging cylinder or accurate scale. Refer to unit rating plate
for required charge.
Step 2—Start-Up Adjustments
Complete the required procedures given in the Pre-Start-Up
section before starting the unit. Do not jumper any safety devices
when operating the unit. Do not operate the unit in Cooling mode
when the outdoor temperature is below 40°F (4.4°C), unless
accessory low-ambient kit is installed. Do not rapid-cycle the
compressor. Allow 5 min. between “on” cycles to prevent com-
pressor damage.
CHECKING COOLING AND HEATING CONTROL OPERA-
TION
Start and check the unit for proper control operation as follows:
1. Place room thermostat SYSTEM switch or MODE control in
OFF position. Observe that blower motor starts when FAN
mode is placed in FAN ON position and shuts down after
proper fan off delay, when FAN MODE switch is placed in
AUTO position.
2. Place system switch or MODE control in HEAT position. Set
control above room temperature. Observe that compressor,
outdoor fan, and indoor blower motors start. Observe that
heating cycle shuts down when control setting is satisfied.
3. When using an automatic changeover room thermostat, place
both SYSTEM or MODE control and FAN mode switches in
AUTO positions. Observe that unit operates in Cooling mode
when temperature control is set to “call for Cooling” (below
room temperature), and unit operates in Heating mode when
temperature control is set to “call for Heating” (above room
temperature).
IMPORTANT:
Three-phase, scroll compressors are direction ori-
ented. Unit must be checked to ensure proper compressor 3-phase
power lead orientation. If not corrected within the phase monitor
will not provide the unit with power. A red light on the phase
monitro will blink. The 3-phase power leads to the unit must be
reversed to correct rotation.
Fig. 15—Control Connections
C99056
Y
C
W2
E
G
R
O
THERMOSTAT
AND SUBBASE
UNIT CONTROL POWER
SPLICE BOX
BRN
WHT
YEL
GRN
RED
ORN
Fig. 16—Line Power Connections
C02005
GROUND LUG
(IN SLPICE BOX)
BLU
YEL
BLK
GROUND
LEAD
LEGEND
IEC –
International Electrical Code
Field Wiring
Splice Connections
NOTE: Use copper wire only.
L1
L3
L2
14
