Addison UHAS 150, Installation, Operation & Service Manual

Page: 43 / 74

SECTION 13: S
ERVICING
35 of 59
SECTION 13: SERVICING
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.
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.
WARNING
Severe Injury Hazard
Turn off gas and electrical supply before
service.
Fan can start automatically at any time.
Failure to follow these instructions can
result in severe injury or product damage.
IMPORTANT: After any maintenance or repair work,
always test fire the heater in accordance with the
start-up instructions
on Page 30, Section 11 through
Page 33, Section 11.7 to help 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 39,
Section 14 through Page 43, 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 150-250
1. Open the hinged door and remove from the
hinges. Set door aside. See Page 45, Section
15.2 .
2. Remove the filler panel (10 screws) to fully
access the burner assembly. See Page 45,
Section 15.2.1 .
3. Remove burner assembly from cabinet via four
screws, two on top and two on bottom. See
Page 45, 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 46, Section 15.2.2 . Clean any deposits
from the main burner which may have formed in
the injectors or venturi of the burner.
5. Chech 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 48, Section
15.4 .
13.2.2 Burner Maintenance for Models 300-400
1. Open the hinged door via tooled access and
remove the burner compartment cover. See
Page 47, Section 15.3 .
2. Remove manifold from burner assembly via
four screws, two on top two on bottom. See