55
MAINTENANCE
Suggested Minimum
Maintenance Schedule
Regular service by a qualified service agency and
maintenance must be performed to ensure maximum
operating efficiency.
Daily and monthly maintenance as outlined below may
be performed by onsite maintenance staff.
Daily
1. Check that the area where the heater is installed
is free from combustible materials, gasoline, and
other flammable vapors and liquids.
2. Check for and remove any obstruction to the flow
of combustion or ventilation air to heater.
Monthly
1. Check for piping leaks around pumps, mixing
valves, relief valves, and other fittings. If found,
repair at once. DO NOT use petroleum-based
stop-leak compounds.
2. Visually inspect burner flame.
3. Visually inspect venting system for proper func-
tion, deterioration or leakage.
4. Visually inspect for proper operation of the con-
densate drain in the venting. If leaks are observed
repair at once.
5. Check air vents for leakage.
Yearly (Beginning Of Each Heating
Season)
Schedule annual service by qualified service agency.
1. Visually check top of vent for soot. Call service
person to clean. Some sediment at bottom of vent
is normal.
2. Visually inspect venting system for proper function,
deterioration or leakage. Ensure that condensate
drain is inspected and ensure that condensate is
being directed to appropriate condensate man-
agement system or drain, as required by local
codes.
Water Sensor / Outdoor Sensor
Water Temperature (°F) Resistance (ohms)
32 32550
41 25340
50 19870
59 15700
68 12490
77 10000
86 8059
95 6535
104 5330
113 4372
122 3605
131 2989
140 2490
149 2084
158 1753
167 1481
176 1256
185 1070
194 915
203 786
212 667
Sensor Resistance Values
Table AB: Approximate Sensor Resistance Values
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