Noritz NR501-OD Service Manual page 22

<NRC661 (-DV, -OD)>
Connect power
2
Water Servo-Main moves to
initial position setting
Initial check
normal
10 years or more
of use
Priority Lamp (Orange) lights
< When using a Optional Remote
ontroller >
Self-diagnosis
Self-diagnosis
Normal combustion
Normal combustion
possible
possible
3
Water Flow Sensor
detected > 0.5 GPM
Initial check
normal
* 1
4
Inlet water high
temperature chek
normal
11 Fan Motor turn ON
12
Fan speed
(target
normal
Re-ignition
(8 times or less)
<SV conversion : 2 times or less>
13 Igniter sparks
Primary Gas Solenoid Valve
14
Primary Gas Solenoid Valve opens
closes
15
Gas Solenoid Valve - 1 opens Gas Solenoid Valve - 1 closes
Gas Proportioning Valve Gas Proportioning Valve
18
opens closes
Igniter stops sparking
10
Flame Rod
detects 1 A
Igniter stops sparking
Burner On Indicator lit
Igniter stops sparking
Gas Solenoid Valve - 1
15
opens or closes
(as necessary) * 2
Gas Solenoid Valve - 2
16
opens or closes
(as necessary) * 2
Gas Solenoid Valve - 3
17
opens or closes
(as necessary) * 2
At max. BTU is
outlet water temp. less
than setting
Water Servo-Main
2
activates
Proportional control
(gas and fan)
Safety device
triggered
A : Displayed on Display Window.
A / B
B : Displayed on Optional Remote Controller.
Display Monitor
768 / 768
transmission abnormality
19
High Limit switch
20 / 20
abnormality
1
Thermal Fuse
14 / 14
abnormality
Gas Solenoid Valve
51, 511 / 51
abnormality
Gas Proportioning Valve
713 / 71
drive circuit abnormality
908 / 90
Self-diagnosis
Normal combustion
possible 901 / 90
99 / 99
901 / 90
Warning indication
20
Condensate Container
29 / 29
clogging
4
Thermistor-Cold Water
311, 312 / 31
open or shorted
5
Thermistor-Hot Water
321, 322 / 32
open or shorted
5
Thermistor-Hot Water
323 / 32
abnormality
6
Thermistor-Heat Exchanger
331, 332 / 33
open or shorted
7
Thermistor-Exhaust
351, 352 / 35
open or shorted
< -DV model only>
Gas Solenoid Valve
51, 511 / 51
abnormality
Circuit Board
70* / 70
abnormality
Gas Solenoid Valve
711, 712 / 71
drive circuit abnormality
9
Flame Rod circuit
72 / 72
abnormality (1 A or more)
611 / 61
90 / 90
11 / 11
10
Flame Rod
detects 1 A
Ignition operation
Re-ignition
121 / 12
(8 times or less)
<SV conversion : 2 times or less>
Extinction
122 / 12
(5 times or less)
19
High Limit Switch
20 / 20
normal
Primary Gas Solenoid Valve
closes
Gas Solenoid Valve - 1 closes
Gas Proportioning Valve
closes
Gas Solenoid Valve - 2 closes
Gas Solenoid Valve - 3 closes
2
Water Servo-Main
Closes
14 / 14
16* / 16
1 20
Overheat prevention
Condensate Container
device (thermal fuse)
triggered (363
9 5
Flame Rod does not
Outlet water temp.
is too high
(0.5 A or less)
Disconnect power
Priority Lamp (Orange) turn OFF
< When using a Optional Remote Controller >
The unit is locked
The unit is locked
Note 1)
Fan motor stops
*1
*2
2
Water Servo-Main
Closes
Primary Gas Solenoid Valve
closes
Gas Solenoid Valve - 1 closes
Gas Solenoid Valve - 2 closes
Gas Solenoid Valve - 3 closes
Gas Proportioning Valve
closes
29 / 29
321, 322 / 32
311, 312 / 31 331, 332 / 33
Note 2)
5 7
Thermistor-Hot Water Thermistor-Exhaust
clogging open or shorted
4 6
Thermistor-Heat
Thermistor-Cold Water
Exchanger
open or shorted
open or shorted
22
sensor detects
< 0.4 GPM
Gas Proportioning Valve
closes
Primary Gas Solenoid Valve
closes
Gas Solenoid Valve - 1 closes
Gas Solenoid Valve - 2 closes
Gas Solenoid Valve - 3 closes
Fan motor stops
Has 49sec.
passed since hot water
Water Servo-Main
activates to mid position
Shutdown
Ignition operation
11 Fan Motor turn ON
12
Fan speed
(target
normal
13 Igniter sparks
14
Primary Gas Solenoid Valve opens
15
Gas Solenoid Valve - 1 opens
Gas Proportioning Valve
18
opens
A p p o r . x 2 6 1 .
If the inlet water temp. is
K > + w t a
o T l a t w t a r e o l f w
less than 125 F or if the
following statements about
Set temp. Less than 125
K are true, the inlet water
temp. will be normal (YES)
K 136
Over Over Over Over
87,200 53,500 36,000 21,000
BTU BTU BTU BTU
Gas Solenoid
ON ON ON
Valve - 1
Gas Solenoid
ON ON ON
Valve - 2
Gas Solenoid
ON ON
Valve - 3
The unit is locked
711 / 71
353, 354 / 35
61* / 61 90* / 90
Note 3)
Note 2)
Gas Solenoid - Valve
open or shorted Abnormality
12
Fan speed
Abnormal combustion
abnormality
Note 1) A number from 1 to 9 is displayed in *
Note 2) A number from 1 to 3 is displayed in *
Note 3) A number 1 or 2 or 4 is displayed in *
611 / 61
90 / 90
o
r e l n i t e e t m . p ( ) F
125
Set temp. + 18
Over
15,000
BTU
ON
The unit is locked
941, 942 / 94
908 / 90 99 / 99
7
Exhaust temperature
is too high
Usage time is
equivalent to
more than 10 years