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GENERAL:
ATTENTION:
Only qualifi ed service technicians, with appropriate test equipment, should be allowed to
service the heater. Bear in mind that all of the components that comprise the system have an effect on heater
operation. Before proceeding with heater related troubleshooting tips covered in Section VII, be certain that
the pump is operating correctly, the fi lters and strainers are not blocked, the valves in the piping are properly
positioned, and the time clocks are properly set.
WARNING:
EXPLOSION HAZARD
Do not attempt to repair any components of
this heater. Do not modify the heater in any manner. To do so may result in a mal-
function that could result in death, personal injury, or property damage. Check with
the consumer to see if any part of the heater has been under water. Replace any part
of the control system and any gas control that has been under water.
MAINTENANCE:
The following inspection procedures are recommended to be performed as part of annual heater mainte-
nance and to ensure safe operation.
1. External heat exchanger
2. Internal heat exchanger
3. Main burner fl ame patterns
4. Main burner orifi ces
5. Operating controls
EXTERNAL HEAT EXCHANGER INSPECTION AND CLEANING:
Remove the louvered exhaust cover panel (see Figure 8) and inspect the external surfaces of the heat exchanger
for soot accumulation. If soot has accumulated, it must be removed by following the recommended procedure:
1. Turn pump, main gas valve, and heater power “OFF”.
2. If the heat exchanger must be removed, follow the procedure in Section II, under “Reversible Wa-
ter Connections”.
WARNING: BURN HAZARD
Do not use a wire brush to remove soot from the
heat exchanger. This could cause a spark and ignite the gases trapped within the soot.
3. Using a soft-tipped brush such as a paint brush, apply a degreaser to the entire heat exchanger sur-
face (top and bottom). Allow the heat exchanger to sit for a period of time to allow the degreaser
to loosen the soot. Wash the heat exchanger using a garden hose ensuring both the top and bottom
surfaces are cleaned. Re-assemble the heater by reversing the disassembly steps.
Although the heat exchanger should be cleaned of soot and reinstalled, the fact that sooting occurred
should be investigated, as it may indicate other problems such as:
•
Insuffi cient air supply
•
Inadequate venting
•
High or low gas pressure
SECTION IV. QUALIFIED TECHNICIAN – MAINTENANCE & SERVICING
