COMBAT® CTCU UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL
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
To help facilitate optimum performance and safety,
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.
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.
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