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®
CTCU UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL
20
SECTION 12: SERVICING
12.1 Servicing Instructions
After commissioning, the heater will require
maintenance to be carried out annually. If the heater
is used in a dirty or dusty area, more frequent
maintenance may be necessary.
Installation Code and Annual Inspections: All
installations and service of ROBERTS GORDON
®
products must be performed by a contractor qualified in
the installation and service of gas-fired heating
equipment and conform to all requirements set forth in
the ROBERTS GORDON
®
manuals and all applicable
governmental authorities pertaining to the installation,
service and operation of the equipment.
To help facilitate optimum performance and safety,
Roberts-Gordon recommends that a qualified contractor
annually inspect your ROBERTS GORDON
®
products
and perform service where necessary, using only
ROBERTS GORDON
®
replacement parts.
NOTE 1: After any maintenance or repair work,
always test fire the heater in accordance with the
commissioning instructions on Page 15, Section 10
through Page 17, Section 10.3.1 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 22,
Section 14 through Page 25, Section 14.5.
NOTE 2: 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.
NOTE 3: Inspect all suspended components and
hardware. Insure that they are in good condition,
properly tightened, and corrosion free.
12.2 Burner Maintenance
1. Open the door and remove the burner compart-
ment cover. See Page 27, Section 15.2.
2. Clean any deposits from the main burner which
may have formed in the injectors or venturi of
the burner. See Page 27, 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.
12.3 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.
12.4 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.
12.5 Gas Control Valve Maintenance
No regular maintenance is required on this device.
To change gas control valves, See Page 26, Step
15.1 and Page 30, Section 15.5.
Do not repair or disassemble on site.
Replace faulty gas valves with genuine
ROBERTS GORDON
®
replacement parts.
12.6 Flue Fan
The flue fan should not require maintenance.
However, if the air pressure switch is causing burner
lockout, then remove the flue fan 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 29,
Section 15.4). Ensure that the fan is free to run and
that the fan wheel is clean.
WARNING
Cut Hazard
Turn off gas and electrical supply before maintenance.
Fan can start automatically at any time.
Failure to follow these instructions can result in severe
injury or
product damage.