7
Fig. 4 — Door Locations
Condenser Fan
The fan must be kept free of all obstructions to ensure proper
cooling. Contact your dealer for any required service.
Electrical Controls and Wiring
Electrical controls are difficult to check without proper instru-
mentation; therefore, if there are any discrepancies in the oper-
ating cycle, contact your dealer and request service.
Refrigerant Circuit
The refrigerant circuit is difficult to check for leaks without the
proper equipment; therefore, if inadequate cooling is suspect-
ed, contact your dealer for service.
Combustion Area and Vent System
The combustion area and vent system should be visually in-
spected before each heating season. The normal accumulation
of dirt, soot, rust, and scale can result in loss of efficiency and
improper performance if allowed to build up. Accumulation on
the burner crossover tube can result in the burners firing out of
normal time sequence. This delayed ignition is characterized
by an especially loud sound.
See Fig. 1 and 4 and proceed as follows to inspect the combus-
tion area and power-venting system of your unit.
1. Turn off gas supply and then electrical power to your unit.
POWER
EXHAU
S
T
OPTION
POWER EXHAU
S
T
ACCE
SS
DOOR
(TYP BOTH
S
IDE
S
)
FILTER
ACCE
SS
DOOR
ACCE
SS
DOOR
S
GA
S
S
ECTION
ACCE
SS
DOOR
GA
S
BURNER
S
AIR
HOOD
S
CONTROL
BOX
CONTROL
BOX
GA
S
S
ECTION
ACCE
SS
DOOR
ACCE
SS
DOOR
S
POWER EXHAU
S
T
ACCE
SS
DOOR
(TYP BOTH
S
IDE
S
)
GA
S
BURNER
S
AIR
HOOD
S
FILTER
ACCE
SS
DOOR
POWER
EXHAU
S
T
OPTION
CONTROL
BOX
GA
S
S
ECTION
ACCE
SS
DOOR
ACCE
SS
DOOR
S
POWER EXHAU
S
T
ACCE
SS
DOOR
(TYP BOTH
S
IDE
S
)
GA
S
BURNER
S
AIR
HOOD
S
FILTER
ACCE
SS
DOOR
POWER
EXHAU
S
T
OPTION
48P 030, 035 (SIZE 030 SHOWN)
48P 040-070 (SIZE 060 SHOWN)
48P 075-100
WARNING
Do not poke sticks, screwdrivers, or any other object into
revolving fan blades. Severe bodily injury may result.
CAUTION
If your unit makes any unusual or especially loud noises
during heating, shut down the heating section and call your
dealer.
