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Sensor Resistance Values
Water Sensor / Outdoor Sensor
Water Temperature °F (°C)
32°F (0°C)
41°F (5°C)
50°F (10°C)
59°F (15°C)
68°F (20°C)
77°F (25°C)
86°F (30°C)
95°F (35°C)
104°F (40°C)
113°F (45°C)
122°F (50°C)
131°F (55°C)
140°F (60°C)
149°F (65°C)
158°F (70°C)
167°F (75°C)
176°F (80°C)
185°F (85°C)
194°F (90°C)
203°F (95°C)
212°F (100°C)
Table V.
Approximate Sensor Resistance Values
Resistance (ohms)
32550
25340
19870
15700
12490
10000
8059
6535
5330
4372
3605
2989
2490
2084
1753
1481
1256
1070
915
786
667
10. 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 on-site 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 function,
deterioration or leakage.
4. Visually inspect for proper operation of the condensate
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
management system or drain, as required by local
codes.
3. Check that area is free from combustible materials,
gasoline, and other flammable vapors and liquids.
4. Check air filter and replace as necessary.
5. Follow pre-start-up check in the Start-up section.
6. Visually inspect burner flame. It should be light blue
at full input. Remove and visually inspect hot surface
igniter and sensor for damage, cracking or debris
build-up.
to
appropriate
condensate
49
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