Operating instructions
and housing with vacuum cleaner, using soft brush attach-
ment. Remove grease and oil with mild solvent.
d. Reassemble wheel into housing.
e. Reassemble motor into housing. Be sure setscrews are
tightened on motor shaft flats and not on round part of
shaft.
f. Reinstall unit access panel.
3. Restore electrical power to unit. Start unit and check for
proper blower rotation and motor speeds during heating and
cooling cycles.
FLUE GAS PASSAGEWAYS
To inspect the flue collector box and upper areas of the heat
exchanger:
1. Remove the combustion blower wheel and motor assembly
according to directions in the Combustion-Air Blower section.
2. Remove the 3 screws holding the blower housing to the flue
collector box cover (See Fig. 31–34).
3. Remove the 12 screws holding the flue collector box cover
(See Fig. 33–34) to the heat exchanger assembly. Inspect the
heat exchangers.
4. Clean all surfaces, as required, using a wire brush.
COMBUSTION-AIR BLOWER
Clean periodically to assure proper airflow and heating efficiency.
Inspect blower wheel every fall and periodically during the heating
season. For the first heating season, inspect blower wheel bi-
monthly to determine proper cleaning frequency.
To inspect blower wheel, remove draft hood assembly. Shine a
flashlight into opening to inspect wheel. If cleaning is required,
remove motor and wheel as follows:
1. Remove unit access panel (See Fig. 32).
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
(030) 60HZ CHARGING CHART
C99046
Fig. 26—Cooling Charging Chart, 48GX030 Units
Fig. 28—Cooling Charging Chart, 48GX042 Units
C00052
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
(042) 60HZ CHARGING CHART
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
(036) 60HZ CHARGING CHART
C00051
Fig. 27—Cooling Charging Chart, 48GX036 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
(048) 60HZ CHARGING CHART
C00053
Fig. 29—Cooling Charging Chart, 48GX048 Units
27