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UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL
32 of 51
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: After any maintenance or repair work,
always test fire the heater in accordance with the
start-up instructions on Page 27, Section 11 through
Page 30, Section 11.3.1 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 35, Section 14
through Page 39, 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
1. Open the door and remove the burner compart-
ment cover. See Page 41, Section 15.2.
2. Clean any deposits from the main burner which
may have formed in the injectors or venturi of
the bu
rner. See Page 41, Section 15.2.
3. Remove the ignition electrode and flame probe.
Check condition of ignition electrode and flame
probe. Clean off any deposits which may have
been formed, check condition of ceramic
insulators. Replace as necessary. See Page
42, Section 15.3.
13.3 Fan/Motor Assembly Maintenance
The main fan bearings are permanently sealed and
do not need lubrication. Before cleaning, turn off gas
and electrical supply. Remove the fan and use a
small brush or duster to clean the fan blades from
each side. Replace fan when done.
13.4 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 tubes which may indicate burner over firing or
persistently low air flows.
13.5 Gas Valve Maintenance
No regular maintenance is required on this device.
To change gas control valves, See Page 40, Section
15.1.
Do not repair or disassemble gas valve.
Replace faulty gas valves with genuine replacement
parts sold and supplied by Roberts-Gordon LLC.
13.6 Flue Blower
The flue blower should not require maintenance.
However, if the air pressure switch is ca
using burner
lockout, then remove the flue blower from the vent
box by unscrewing the three screws at the mounting
plate. Remove the four screws attaching the
mounting plate to the fan inlet (See Page 44,
Section 15.6). Ensure that the fan is free to ru n and
that the fan wheel is clean.
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.