Addison UHD150, Installation, Operation & Service Manual

Page: 43 / 68

SECTION 13: S
ERVICING
35 of 55
SECTION 13: SERVICING
13.1 Servicing Instructions
After start-up, the heater will require maintenance to
be carried out, at a minimum, annually. If the heater
is used in a dirty or dusty area, more frequent
maintenance may be required.
IMPORTANT: Prior to any maintenance or service of
the heater, shut off, lockout and tagout the electrical
disconnect and gas valve that supplies the unit in
accordance with OSHA regulations. After any
maintenance or repair work, always test fire the
heater in accordance with the start-up instructions
on Page 28, Section 11 through Page 32, Section
11.7 to ensure all safety systems are in working order
before leaving the heater to operate. Minor faults
may be traced by using the troubleshooting charts
on Page 38, Section 14 through Page 42, Section
14.5 .
IMPORTANT: Check all gas pipes and pipe joints to
ensure there are no cracks or gas leaks. Any cracks
in the pipes or pipe joints must be repaired.
IMPORTANT: Inspect all suspended components
and hardware. Ensure that they are in good
condition, properly tightened, and corrosion free.
13.2 Burner Maintenance
13.2.1 Burner Maintenance for Models 150-400
1. Open the hinged door via tooled access and
remove from the hinges. Set door aside. See
Page 44, Section 15.2 .
2. Remove the filler panel (10 screws) to fully
access the burner assembly. See Page 44,
Section 15.2.1 .
3. Remove burner assembly from cabinet via
screws around the burner assembly (quantity
will vary).
See Page 44, Section 15.2.1 .
Electrode and flame probe should remain
attached.
4. Remove manifold from burner assembly via
four screws, two on top and two on bottom. See
Page 45, Section 15.2.2 . Clean any deposits
from the main burner which may have formed in
the injectors or venturi of the burner.
5. Check condition of ignition electrode and flame
probe. Clean off any deposits which may have
formed, check condition of ceramic insulators.
Replace as required.
See Page 46, Section
15.3 .
13.3 Heat Exchanger Maintenance
The heat exchanger will remain clean unless a
problem has developed with combustion. Inspect the
heat exchanger. Look for signs of overheating at the
front of the tubes which may indicate burner over
firing or persistently low air flows.
13.4 Gas Valve Maintenance
No regular maintenance is required on this device.
To change gas control valves, See Page 43, Section
15.1 .
Do not repair or disassemble gas valve.
Replace faulty gas valves with replacement parts
sold and supplied by Addison.
13.5 Flue Blower
The flue blower should not require maintenance.
However, if the air pressure switch is causing burner
lockout, then remove the flue blower from the vent
box by unscrewing the screws at the mounting plate.
Screw quantity will vary by model size. Remove the
screws attaching the mounting plate to the fan inlet.
See Page 47, Section 15.5 through Page 48,
Section 15.6 . Ensure that the fan is free to run and
Cut/Pinch Hazard
Wear protective gear
during installation,
operation and service.
Edges are sharp.
WARNING
Failure to follow these instructions can result in death, electric shock, injury or property damage.
Burn Hazard
Allow heater to cool
before service.
Tubing may still be hot
after operation.
Explosion Hazard
Turn off gas supply to
heater before service.
DANGER
Electrical Shock Hazard
Disconnect electric
before service.
Heater must be
connected to a properly
grounded electrical
source.