Freeze Prevention Control; Freeze Prevention Heater - Noritz NR501-OD Service Manual
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Also See for NR501-OD:
- Installation manual (28 pages) ,
- Owner's manual (32 pages) ,
- Replacement (11 pages)
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Freeze Prevention Control
<NR501-OD, NR662-OD>
301,302 / 30
Heaters turn ON
Freeze prevention heater
7
Thermistor-Air
normal
Thermistor-Air
less than 37 ﾟF (3
ﾟC
)
YES
Thermistor-Air
less than 28 ﾟF (-2
)
ﾟC
YES
Heaters turn ON
Thermistor-Air
more than 14 ﾟF (-10
)
ﾟC
YES
Has 50 min passed
YES
Heaters turn OFF
Thermistor-Air
more than 14 ﾟF (-10
ﾟC
)
YES
Has 5 min passed
YES
NO
NO
C
Heaters turn ON
NO
NO
Thermistor-Air
more than 14 ﾟF (-10
NO
Has 20 min passed
Heaters turn OFF
NO
Thermistor-Air
C
more than 14 ﾟF (-10
NO
Has 15 min passed
21
ﾟC
)
YES
NO
YES
NO
C
ﾟC
)
YES
NO
YES
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Troubleshooting
