Allied Air Enterprises 506299-01 - Manual (Page 6)

Page 6 506299-01 Issue 0912
Contact your dealer if you desire more information about
this important safety feature.
Should any unusual conditions be observed during your
inspections, call an authorized service dealer immediately.
Return Air
All return air duct connections must be tight and sealed
to unit cabinet. Supply and return air registers must be
open when the unit is in operation. Obstructions must
not be allowed to block airflow in or out of the registers.
Filters
Air filters are to be used with this heating/cooling unit.
Filters are not factory supplied in the unit. However,
Table 1
Minimum Required Surface Area
for Disposable Filters
the return air compartment includes provisions that allow
filters to be installed within the unit. Otherwise, a filter
must be installed in the duct work by the installer. Filters
must always be installed ahead of the evaporator coil and
must be kept clean or replaced. Dirty filters will reduce
the airflow of the unit. Filters should be sized in accordance
with Table 1.
Outdoor Coil
Leaves and other large obstructions should be carefully
removed from the outdoor coil surfaces without damaging
the fin surface of the coil.
Lubrication
Lubrication of the bearings in the circulating air blower motor
and the combustion blower motor is not recommended.
Blower Assembly
Even with good filters properly in place, blower wheels
and motors will become dust laden after long months of
operation. The entire blower assembly should be inspected
annually. If the motor and wheel are heavily coated with
dust, they can be brushed and cleaned with a vacuum
cleaner.
Typical Flame Appearance
Figure 3
Burner Flame
While the unit is in operation, observe the burner flames.
Compare these observations to Figure 3 to determine if
proper flame adjustment is present. If your observations
indicate improper flame adjustment, call your authorized
service dealer for service. Do not attempt to adjust
flame! Your service representative will perform this
adjustment correctly.
Rollout Switch
This unit is equipped with a manual reset high temperature
sensor or rollout switch. In the unlikely event of a sustained
burner flame rollout, the rollout switch will shut off the flow of
gas by closing the gas valve. The switch is located inside
the gas burner area. Flame rollout can be caused by
blockage of the power vent system, a blocked heat
exchanger, or improper gas pressure or adjustment. If this
event occurs, the unit will not operate properly. The gas
supply to the unit should be shut off and no attempt should
be made to place it in operation. The system should be
inspected by a qualified service technician.