Noritz NRC661-DV, Service Manual, Page: 24 / 78

Thermistor-Exhaust
normal
Thermistor-Exhaust
less than 37 (3 )
351, 352 / 35
Heaters turn ON
YES
YES
NO
NO
Heaters turn ON
Thermistor-Exhaust
(8 ) or more
NO
Has 50 min passed
Thermistor-Exhaust
less than 37 F (3 )
YES
YES
YES
NO
NO
Heaters turn OFF
-DV
or
SV conversion
NO
YES
YES
NO
8
301, 302 / 30
Thermistor-Air
normal
Freeze prevention control
Freeze prevention heater
7
Thermistor-Air
less than 37
Thermistor-Air
less than 28
Heaters turn ON
Has 50 min passed
Heaters turn OFF
Has 5 min passed
Heaters turn ON
Has 20 min passed
Heaters turn OFF
Has 15 min passed
C
C
YES
YES
YES
YES YES
YES
YES
NO
YES
NO
NO
NO
NO
NO
NO
NO
C
YES
NO
Thermistor-Air
more than 14
Thermistor-Air
more than 14
NO
NO
YES
Thermistor-Exhaust
18
Fan Turn ON
< 1,200 rpm >
3 minutes
Fan speed
1,200 500rpm
611 / 61 Thermistor-Exhaust
26 F or more
Fan Turn OFF
No error code
611, 612, 614 / 61
Thermistor-Exhaust
46 or more
Fan Turn OFF
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
Fan motor operation flow ( -DV model )
Thermistor-Exhaust
normal
NO
YES
351, 532 / 35
Thermistor-Exhaust
32
Fan Turn ON
< 2,400 rpm >
Thermistor-Exhaust
more than 14
Fan speed
Target 500rpm
611 / 61
Fan Turn OFF
No error code
611, 612, 614 / 61
Thermistor-Exhaust
46
Fan Turn OFF
YES
NO
YES
NO
YES
NO
NO
YES
NO
NO
YES
Thermistor-Air
more than 32
Fan Turn ON
< 1,200 rpm >
Thermistor-Exhaust
X or more
* 4 When fan speed is 1,200rpm, X = 46 F
* 2 When fan speed is 2,400rpm, X = 59 F
* 4
YES
NO
YES
Fan motor stopped
YES
NO
Thermistor-Air
more than 32
Thermistor-Air
32
Fan speed
set 2,400 rpm
Fan speed
set 1,200 rpm
YES
NO
YES
NO
8
Thermistor-Exhaust
normal
NO
YES
Thermistor-Air
normal
Thermistor-Air
normal
YES
NO
NO
YES
YES
Fan motor operation flow ( SV conversion )
7
351, 352 / 35
24
<NRC661 (-DV, -OD), NRC711 (-DV, -OD)>