Maintenance - HeatStar HSU100NGPALP Operating Instructions And Owner's Manual

MAINTENANCE

Annually have a qualified service agency perform the following
WARNING: Service and maintenance must be performed by a
qualified service person.
Use only factory authorized replacement parts.
1. Before any service, TURN OFF THE GAS AT THE MANUAL
SHUT-OFF VALVE AND TURN OFF ALL ELECTRIC POWER TO
THE HEATER.
2. Circulating air fan and motor:
a. Verify the fan blade set screw is tight with a minimum torque
of 25 inch pounds and maximum of 100 inch pounds.
b. Clean the fan blade, fan guard and motor.
c. Verify the fan blades, motor shaft and motor are not dam-
aged.
3. Burners and orifices:
a. Remove the burners from the heater and clean them with an
appropriate brush or cloth.
b. Clean the orifices and verify the holes are not blocked.
c. Check for damage, rust, or deterioration.
d. Verify the burner carry-over ports are not damaged and that
they are touching each other.
4. Spark ignitor and sensor:
a. Carefully clean the sensor and spark ignitor.
b. Check for cracks in the ceramic.
c. Check for damage or deterioration of the metal parts.
5. Wiring:
a. Check wiring for loose connections.
b. Check for heat damage to wires.
maintenance:
Compact Unit Heater
6. Gas valve and pipe:
a. Leak check gas fittings with suitable leak detectors. Do not
use a match or open flame. Make sure to turn the gas on for
this portion of the service.
b. Verify the manifold gas pressure and inlet gas pressure.
7. Combustion blower:
a. Clean dust and dirt from the air cooling blades.
b. Clean dust and dirt off the motor.
c. Verify the high temperature silicone rubber hose is not
cracked or damaged.
8. Heat exchanger and cabinet:
a. Inspect the heat exchanger for damage and cracks.
b. Inspect all hardware (screws, nuts, sight glass) on the cabi-
net, including hardware used for mounting.
9. Vent System:
a. Inspect the vent system for damage, loose fasteners, loose
supports or evidence of damage to surrounding materials.
b. Clean the vent and air inlet terminations.
c. Clean the air inlet screen on the heater.
d. Clean the drip leg.
Green LED Diagnostic Codes
Steady ON
Steady OFF
Slow Flash
Fast Flash
2 Flashes In Lockout From Failed Ignitions or Flame Losses
Pressure Switch Open with Inducer On or
3 Flashes
4 Flashes
5 Flashes Flame Sensed While Gas Valve Off
6 Flashes On-Board Microprocessors Disagree
16
Operating Instructions and Owner's Manual
TABLE 10
Control Internal Failure
Internal Control Fault or No Power
Control OK, No Call For Heat
Control OK, Call For Heat Present
Closed with Inducer Off
Limit or Rollout Switch is Open