20
Part Number PLUS-E017-A/1206
PLUS LINE
Indirect-Fired Water Heaters – Series 3
Water heater maintenanceA6
Maintenance
schedule – annual
service technician
Annual service by qualified service technician to include:
• Any procedures required by local codes.
• Check air vent operation.
• Verify system pressure. Air venting procedure may require adding water to bring system
up to pressure, typically 12 psig.
• Manually operate T&P relief valve at least once a year. This will release some hot water.
• Move operating lever to open position for a few seconds and then move it back,
allowing it to snap closed. After T&P relief valve is operated, if it continues to release
water, close cold water inlet to water heater immediately. Follow draining instructions,
and replace T&P relief valve. If T&P relief valve weeps periodically, it may be due to
thermal expansion (see “Thermal Expansion”, page 13). Do not plug T&P relief valve
or discharge piping.
• Follow instructions on circulator to oil it, if oil-lubricated.
• Check valves, pipes and fittings for leaks.
• Check function of field-installed controls and valves (see control manufacturer’s instruc-
tions).
• Review homeowner’s maintenance responsibilities and their frequencies, including any
not listed in the following paragraphs.
Before operating T&P relief valve,
make sure no one is in front of or
around T&P relief valve discharge
piping. Hot discharge water can
cause severe personal injury or
substantial property damage.
Plugging T&P relief valve or discharge piping can cause excessive pres-
sure in water heater, resulting in severe personal injury, death or substantial
property damage.
Maintenance
schedule – monthly
homeowner
Homeowner monthly maintenance to include:
• Check air vent operation:
• Automatic air vent — remove cap (see Figure 8). Briefly push in valve and release it to
clean valve seat. Screw cap on completely, then unscrew one turn. If air vent does not
operate, call qualified service technician.
• Visually check valves, pipes and fittings for leaks. Call qualified service technician to repair
leaks.
Figure 8
Remove air vent cap to check
operation
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