Noritz NR50-OD User Manual

b
44
6. Operation Flow Chart
Water Heating
NO
Safety device triggered
Flow is adjusted
than setting
outlet water temp. less
(1μA or more)
abnormality
Flame rod circuit
Outlet thermistor
open or shorted
Inlet thermistor
abnormality
Circuit board
YES
fan speed
> 0.5 GPM
YES
NO
normal
Initial check
Hot water demanded
( )
Igniter stops sparking
others: after 2 sec.
1st, 4th, 7th: after 5 sec.
detects > 1 μA
Flame rod
Igniter sparks
Priority Lamp (Yellow) Lights
Connect power
On/O button turn ON
Inlet water high
*1
Abnormal combustion
6114
16 32
open or shorted
31
Inlet thermistor
open or shorted
31
32
71
Fix problem
Fan motor stops
61
72
Stop hot water demand
Disconnect Power
Total water ow (GPM)
Approx. 35.7
water inlet temperature (° F)
Set temperature
K
If the inlet temp is less than 122°F
> a *2
Water ow sensor detects
target 200 rpm
(After 60 sec)
open or shorted
Burner On Lamp
Outlet thermistor
136 °F
Set temp +18 ° F
127 °F
127 °F
Hot water capacity
90
YES
Thermal fuse normal
NO
14
Normal
99
to more than 10 years
Using terms is equivalent
Flow control valve activates
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
YES
or if the following statements
about K are true , the inlet temprature
will be normal (YES)
*1
*Water control valve opens fully
(Fan abnormality)
1
2
3
6
8
9
10
11
12
14
15
14
5
1
4
3
4
7
7
3
4
5
temperature check
Igniter stops sparking
At max BTU, is
Hot water capacity
> b *2
goes o
closes
Gas solenoid Valve 2
Gas solenoid valve 1
opens
Primary gas solenoid
valve opens
Gas proportioning valve
opens
Fan motor
ON
Burner On lamp
lights
Gas solenoid valve 2
opens
Gas solenoid valve 2
opens
closes
Gas solenoid valve 1
Primary gas solenoid
valve closes
Gas solenoid valve 1
closes
Gas proportioning valve
closes
Burner On lamp
goes o
Gas proportioning valve
closes
Gas solenoid valve 2
closes
Primary gas solenoid
valve closes
Gas solenoid valve 1
closes
(0.5 μA or less)
not detect a ame
Flame rod does
triggered
Thermal fuse
(363 °F or more)
is too high
Outlet water temp.
Abnormal gas solenoid
valve drive circuit
(56,500BTU/h)
1.9 GPM
*2
*NR71 (-SV,-OD)/
N-0631S (-OD) Only
*NR71/N-0631S (-OD) Only
(99,000BTU/h)
3.5 GPM
a
NR66/N-0531S
b
(With remote controller)
NO
YES
70
(73,500BTU/h)
2.4 GPM
(126,000BTU/h)
4.4 GPM
a
Turn Power O
Priority lamp turns OFF
Error code stops ashing
(With remote controller)
Current leakage safety
device normal
NO
YES
10
99
Self-diagnosis
Normal combustion
NO
YES
The unit will continue to operature with
the code blinking.
Warning indication
Warning indication
of use
YES
10 years or more
NO
Maximum output limited
90
NO
YES
90
possible
Self-diagnosis
Normal combustion
possible
Self-diagnosis
Normal combustion
possible
Warning indication
YES
(Flame rod)
(Ignition failure)
11
12
(High-limit switch)
20
NO
13
High limit switch
is normal
YES
NO (3rd)
(5 times or less)
YES
Extinction
NO
Re-ignition
(8 times or less)
Fan speed
*3 When the present fan speed is 500rpm more or less than target speed.
abnormality
*3
NR50-OD / NR66 (-SV,-OD) / N-0531S (-OD), NR71 (-SV,-OD) / N-0631S (-OD)
NR71/N-0631S
b
(53,000BTU/h)
1.8 GPM
(81,000BTU/h)
2.9 GPM
a
NR50-OD

Noritz NR50-OD Specifications

General

Brand	Noritz
Model	NR50-OD
Category	Water Heater
Language	English