85
INDUCED
DRAFT
MOTOR
COMBUSTION
FAN HOUSING
MAIN GAS
VALVE
MAIN BURNER SECTION
HEAT EXCHANGER
SECTION
ROLLOUT
SWITCH
C07037
Fig. 50 −
48PG03−14 Typical Gas Heating Section
(48PG03−07 Shown)
HEAT
EXCHANGER
SECTION
IGC BOARD
(HIDDEN)
COMBUSTION
FAN HOUSING
MAIN BURNER
SECTION
INDUCED
DRAFT
MOTOR
MAIN GAS
VALVE
C07259
Fig. 51 −
48PM16−28
Typical Gas Heating Section
Condenser and Evaporator−Fan Motor Bearings
The condenser-fan and evaporator-fan motors have permanently
sealed bearings, so no field lubrication is necessary.
Economizer or Manual Outside Air Damper
If blade adjustment is required, refer to unit or accessory
installation instructions.
Evaporator Fan Service and Replacement
The units feature a slide-out fan deck for easy servicing of the
indoor-fan motor, pulleys, belt, and bearings. To service
components in this section, perform the following procedure:
1. Turn off unit power.
2. Open the fan section access door.
3. Remove two no. 10 screws at front of slide-out fan deck.
Save screws. (See Fig. 52 or 53.)
4. For 48/50PG03−14 units, disconnect the electrical wires
connected to the slide−out fan deck (supply air thermistor
and fan status switch if installed). Wires may be damaged if
not disconnected. For 48/50PM16−28 units, disconnect the
limit switch wires located on the right side of the fan deck
(48 series only). Other wires do not need to be
disconnected.
5. Fan deck can now be slid out to access serviceable
components.
UNIT DAMAGE HAZARD
Failure to follow this caution may result in damage to the
unit.
DO NOT SLIDE FAN DECK OUT PAST THE FAN
DECK STOP. If further access is required, the fan deck
must be supported. Make sure plugs and wiring are not
pinched between fan housing and unit sheet metal post.
CAUTION
!
6. To replace fan deck to operating position, slide fan deck
back into the unit. Secure with the two no. 10 screws
removed in Step 3.
7. Re-attach electrical wires.
8. Close fan section access door.
9. Restore power to unit.
MOUNTING
BASE
FAN
PULLEY
MOTOR
PULLEY
SLIDE-OUT
FAN DECK
SCREW
SCREW
(HIDDEN)
MOTOR
FAN DECK STOP
C06177
Fig. 52 −
48/50PG03−14
Evaporator−Fan Motor Adjustment
FAN
PULLEY
MOTOR
MOUNTING
BASE
MOTOR
PULLEY
(HIDDEN)
SLIDE-OUT
FAN DECK
LIMIT
SWITCH
QUICK
CONNECT
(48PM ONLY)
C08008
Fig. 53 −
48/50PM16−28
Evaporator−Fan Motor Adjustment
48/50PG and PM
Summary of Contents for 48/50PG C03-14
Page 31: ...31 C07009 Fig 18 Air Baffle Dimensions 48 50PG03 16 48 50PG and PM...
Page 32: ...32 C08077 Fig 19 Air Baffle Dimensions 48 50PM16 28 48 50PG and PM...
Page 56: ...56 C08549 Fig 25 48PG03 16 Control Wiring Schematic 48 50PG and PM...
Page 57: ...57 C08550 Fig 26 50PG03 16 Control Wiring Schematic 48 50PG and PM...
Page 62: ...62 C08471 Fig 31 Typical 48PM16 28 Control Schematic 48 50PG and PM...
Page 63: ...63 C08062 Fig 32 Typical 48PM16 28 with Humidi MiZert System Control Schematic 48 50PG and PM...
Page 64: ...64 C101251 Fig 33 Typical 50PM16 28 Control Schematic 48 50PG and PM...
Page 65: ...65 C08064 Fig 34 Typical 50PM16 28 with Humidi MiZert Control Schematic 48 50PG and PM...
Page 66: ...66 C10902 Fig 35 Typical 48 50PM16 28 Power Schematic 48 50PG and PM...
Page 67: ...67 C09213 Fig 36 Typical 48 50PM16 28 with Humidi MiZert System Power Schematic 48 50PG and PM...
Page 69: ...69 C08067 Fig 38 48 50PM16 28 Component Arrangement 48 50PG and PM...
Page 70: ...70 C101252 Fig 39 48 50PM16 28 with Humidi MiZert Component Arrangement 48 50PG and PM...