UH1-DH1-SF-1L
Service Facts
5
AIRFLOW ADJUSTMENT
Check inlet and outlet air temperatures to make sure they
are within the ranges specified on the furnace rating name-
plate. If the airflow needs to be increased or decreased, see
the wiring diagram for information on changing the speed
of the blower motor.
▲
WARNING
!
Disconnect power to the unit before removing the blower
door.
Failure to follow this warning could result in personal
injury from moving parts.
This unit is equipped with a blower door switch which cuts
power to the blower and gas valve causing shutdown when
the door is removed. Operation with the door removed or
ajar can permit the escape of dangerous fumes. All panels
must be securely closed at all times for safe operation of the
furnace.
▲
WARNING
!
The following warning complies with State of California law, Proposition 65.
This product contains fiberglass wool insulation!
Fiberglass dust and ceramic fibers are believed by the
State of California to cause cancer through inhalation.
Glasswool fibers may also cause respiratory, skin, or
eye irritation.
PRECAUTIONARY MEASURES
●
Avoid breathing fiberglass dust.
●
Use a NIOSH approved dust/mist respirator.
●
Avoid contact with the skin or eyes. Wear long-sleeved,
loose-fitting clothing, gloves, and eye protection.
●
Wash clothes separately from other clothing: rinse
washer thoroughly.
●
Operations such as sawing, blowing, tear-out, and
spraying may generate fiber concentrations requiring
additional respiratory protection. Use the appropriate
NIOSH approved respirator in these situations.
FIRST AID MEASURES
Eye Contact –
Flush eyes with water to remove dust.
If symptoms persist, seek medical
attention.
Skin Contact –
Wash affected areas gently with soap
and warm water after handling.
The following warning complies with State of California law, Proposition 65.
Hazardous Gases!
Exposure to fuel substances or by-products of incomplete
fuel combustion is believed by the state of California to
cause cancer, birth defects, or other reproductive harm.
▲
WARNING
!
BODILY INJURY CAN RESULT FROM HIGH VOLTAGE
ELECTRICAL COMPONENTS, FAST MOVING FANS,
AND COMBUSTIBLE GAS. FOR PROTECTION FROM
THESE INHERENT HAZARDS DURING INSTALLATION
AND SERVICING, THE ELECTRICAL SUPPLY MUST BE
DISCONNECTED AND THE MAIN GAS VALVE MUST
BE TURNED OFF. IF OPERATING CHECKS MUST BE
PERFORMED WITH THE UNIT OPERATING, IT IS THE
TECHNICIANS RESPONSIBILITY TO RECOGNIZE
THESE HAZARDS AND PROCEED SAFELY.
▲
WARNING
!
INDOOR BLOWER TIMING
Heating:
The control module controls the indoor blower.
The blower start is fixed at 45 seconds after ignition.
Downflow models have a 10 second blower ON delay. The
FAN-OFF period is field selectable by dip switches at 60,
100, 140, or 180 seconds. The factory setting is 100 seconds
(See wiring diagram).
Cooling:
The fan delay off period is factory set at 0 sec-
onds. The option for 80 second delay off is field selectable
(See wiring diagram).
NOTE:
Direct drive motors have bearings which are perma-
nently lubricated and under normal use, lubrication is not
recommended.
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