Start Up - Operation - Lennox Enlight LGT Series Manual

300 CHARGING CURVE CIRCUIT 4 - REHEAT - ALL-ALUMINUM COIL - 581100-01
130
120
110
100
90
80
70
100
IV- START-UP OPERATION
A-Preliminary and Seasonal Checks
1 - Make sure the unit is installed in accordance with
the installation instructions and applicable codes.
2 - Inspect all electrical wiring, both field and factory
installed for loose connections. Tighten as required.
Refer to unit diagram located on inside of unit
control box cover.
3 - Check to ensure that refrigerant lines are in good
condition and do not rub against the cabinet or
other refrigerant lines.
4 - Check voltage. Voltage must be within the range
listed on the nameplate. If not, consult power
company and have the voltage corrected before
starting the unit.
5 - Recheck voltage and amp draw with unit running. If
voltage is not within range listed on unit nameplate,
stop unit and consult power company. Refer to unit
nameplate for maximum rated load amps.
6 - Inspect and adjust blower belt (see section on
Blower Compartment - Blower Belt Adjustment).
110 120 130
Suction Pressure (psig)
B-Cooling Start-up
NOTE-Crankcase heaters must be energized 24 hours
before attempting to start compressor. Set thermostat so
that there is no demand to prevent compressor from cy-
cling. Apply power to unit.
1 - Initiate first and second stage cooling demands
according to instructions provided with thermostat.
2 - First-stage
indoor blower in Low Cooling CFM. Second-stage
thermostat demand will energize indoor blower
in High Cooling CFM. Both demands energize
compressor 1. The remaining compressors will be
energized as needed to meet cooling demand.
3 - 156 units contain two refrigerant circuits or
systems. 180 units contain three refrigerant circuits
or systems. 210, 240 and 300 units contain four
refrigerant circuits or systems.
4 - Each refrigerant circuit is separately charged with
R410A refrigerant. See unit rating plate for correct
amount of charge.
5 - Refer to the Refrigerant Check and Charge section
to check refrigerant charge.
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Outdoor Temperature (°F)
95°
85°
75°
65°
140 150
thermostat demand
115°
105°
160
will energize