Addison UHAS 150, Installation, Operation & Service Manual

Page: 45 / 74

SECTION 13: S
ERVICING
37 of 59
Vent Pipe/Terminals Venting must be intact. Using a flashlight, look for obstructions, cracks on the
pipe, gaps in the sealed areas or corrosion.
The area must be free of dirt and dust.
Remove any carbon deposits or scale using a wire brush.
If the vent terminal has a screen built in, remove any dirt, dust or deposits
from the screen.
See Page 11, Section 7 through Page 18, Section 8 .
Cabinet Exterior After installation, touch up scratches. Periodic paintings should be done
thereafter as required. Warning labels and logo labels should be legible and
accurate. Please contact Addison or ADDISON
® independent distributor if you
need replacement warning labels or logo labels.
See Page 2, Figure 1 through Page 3, Figure 2 .
Combustion Air Intake
Pipe Intake pipe and inlet must be intact. Look for obstructions, cracks on the pipe,
gaps in the sealed areas or corrosion.
The area must be free of dirt and dust.
Clean and reinstall as required.
See Page 18, Section 8 .
Heat Exchanger Make sure there are no cracks.
Make sure there is no sagging, bending or distortion.
Clean or replace as required.
Gas Line and Shut-off
Valves
Check for gas leaks.
See Page 19, Section 9 .
Burner Observation
Window
Make sure it is clean and free of cracks or holes.
Clean and replace as required.
Flue Blower Scroll, Wheel
and Motor Compressed air or a vacuum cleaner may be used to clean dust and dirt.
Inshot Burners and
Orifices Clear of obstructions (even spider webs will cause problems).
Carefully remove any dust and debris from the burner.
Direct-Spark Igniter Replace if there are cracked ceramics, excessive carbon residue, or erosion
of the electrode.
The electrode gap should be 1/8" (3.2 mm).
Thermostat There should be no exposed wire or damage to the device or wiring.
See Page 21, Section 10 .
Suspension Points Make sure the heater is hanging securely.
Look for signs of wear on the suspension materials or ceiling.
See Page 10, Figure 4 .