Operating instructions
For longer life, operating economy, and continuing efficiency,
clean accumulated dirt and grease from the blower wheel and
motor annually.
Before cleaning the blower motor and wheel, disconnect gas
supply. Then turn off and tag electrical power to the unit.
Failure to adhere to this warning could cause serious injury or
death.
Cleaning the Blower Motor and Wheel
1. Remove and disassemble blower assembly as follows:
a. Remove unit access panel.
b. Disconnect motor lead from blower relay (BM). Discon-
nect yellow lead from terminal L2 of the contactor.
c. On all units, remove blower assembly from unit. Remove
screws securing blower to blower partition and slide
assembly out. Be careful not to tear insulation in blower
compartment.
d. Ensure proper reassembly by marking blower wheel and
motor in relation to blower housing before disassembly.
e. Loosen setscrew(s) that secures wheel to motor shaft.
Remove screws that secure motor mount brackets to
housing, and slide motor and motor mount out of housing.
2. Remove and clean blower wheel as follows:
a. Ensure proper reassembly by marking wheel orientation.
b. Lift wheel from housing. When handling and/or cleaning
blower wheel, be sure not to disturb balance weights (clips)
on blower wheel vanes.
c. Remove caked-on dirt from wheel and housing with a
brush. Remove lint and/or dirt accumulations from wheel
C00045
Fig. 22—Cooling Charging Chart, 48GS042 Units
Fig. 24—Cooling Charging Chart, 48GS060 Units
C00048
SUCTION LINE PRESSURE (KILOPASCALS)
SUCTION LINE PRESSURE (PSIG)
-14 1016212732
SUCTION LINE TEMPERATURE (°F)
SUCTION LINE TEMPERATURE (°C)
689
620
551
483
414
345
276
207
100
90
80
70
60
50
40
30
30 40 50 60 70 80 90
OUTDOOR TEMP
° F ° C
115 46
45 7
55 13
65 18
75 24
95 35
105 41
85 29
SUCTION LINE PRESSURE (KILOPASCALS)
SUCTION LINE PRESSURE (PSIG)
-14 1016212732
SUCTION LINE TEMPERATURE (°F)
SUCTION LINE TEMPERATURE (°C)
758
689
620
551
483
414
345
276
110
100
90
80
70
60
50
40
30 40 50 60 70 80 90
OUTDOOR TEMP
° F ° C
115 46
45 7
55 13
65 18
75 24
95 35
105 41
85 29
C00047
Fig. 23—Cooling Charging Chart, 48GS048 Units
SUCTION LINE PRESSURE (KILOPASCALS)
SUCTION LINE PRESSURE (PSIG)
-14 1016212732
SUCTION LINE TEMPERATURE (°F)
SUCTION LINE TEMPERATURE (°C)
689
620
551
483
414
345
276
207
100
90
80
70
60
50
40
30
30 40 50 60 70 80 90
OUTDOOR TEMP
° F ° C
115 46
45 7
55 13
65 18
75 24
95 35
105 41
85 29
(024) 60HZ CHARGING CHART
C00049
Fig. 25—Cooling Charging Chart, 48GX024 Units
26