Noritz WHiC56 Service Manual page 18

A
*1
5
Inlet water high
NO
temperature check
normal
YES
11 Fan Motor ON
12 Fan speed
NO
(target 200 rpm)
YES
Igniter sparks
13
Primary Gas Solenoid
14
Valve opens
Gas Solenoid Valve-1
15
opens
Gas Solenoid Valve-2
16
opens
Gas Proportioning Valve
17
opens
(
1st, 4th, 7th:after 5 sec.
10
NO others:after 2 sec.
Flame Rod
detects 1 A
YES
Burner ON Indicator
lights
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
18 opens or closes
(as necessary) *2
Gas Solenoid Valve-4
19 opens or closes
(as necessary) *2
At max, kW is
NO
outlet water temp. less
than setting
YES
Main Flow Control Valve
2
activates
Flow is adjusted
NO
Safety device triggered
YES
If the inlet temp is less than 50°C
*1
or if the following statements
about K are true, the inlet temperature
will be normal (YES).
Re-ignition
(After 60 sec)
(8 times or less)
(5 times or less)
20
High limit switch
is normal
Primary Gas Solenoid
Valve closes
Gas Solenoid Valve-1
Gas Solenoid Valve-2
)
Gas Proportioning Valve
Igniter stops sparking
Gas Solenoid Valve-3
Gas Solenoid Valve-4
Burner ON Indicator
goes off
14
16
1
Overheat prevention
Condensate Container
device (Thermal fuse) abnormality (check for
triggered (221°C or more)
electrode connections)
< Condensing Model only >
9 6
Flame Rod does
Outlet water temp.
not detect a flame
is too high
(0.45 A or less)
*3 When the present fan speed is 500rpm more or less than target speed.
Approx. 2.5 × 25
K > + water inlet temperature (°C)
Total water flow (L/min)
Set temperature
37°C or more
Set temp +5°C
K
61
YES
NO
11
YES
Extinction NO
12
YES
NO (3rd)
20
closes
Primary Gas Solenoid
closes
closes
Gas Proportioning Valve
closes
closes
29 32
31 33
6
Water Outlet
Thermistor
open or shorted
blockage and
5 7
Water Inlet
Heat Exchanger
Thermistor
Thermistor
open or shorted
open or shorted
*2
WHi49
LWHi49
WHiX49
LWHiX49
WHiC56
LWHiC56
WHiCX56
LWHiCX56
Gas Solenoid
Valve-1
Gas Solenoid
Valve-2
Gas Solenoid
Valve-3
Gas Solenoid
Valve-4
- 18 -
B
Fan Motor stops
Valve closes
Gas Solenoid Valve-1
closes
Gas Solenoid Valve-2
closes
Gas Solenoid Valve-3
closes
Gas Solenoid Valve-4
closes
closes
Burner ON Indicator
goes off
35 71
61
8
Exhaust Thermistor
Gas Solenoid Valve
open or shorted
abnormality
< (L)WHiC56 only>
12
Fan speed
abnormality *3
Over Over Over
38.4kW 24.2kW 17.4kW
Over Over Over
36.1kW 23.5kW 16.2kW
Over Over Over
36.6kW 24.1kW 15.3kW
Over Over Over
37.0kW 21.6kW 15.2kW
Over Over Over
41.9kW 26.3kW 16.7kW
Over Over Over
41.2kW 24.8kW 16.6kW
Over Over Over
42.0kW 25.8kW 16.4kW
Over Over Over
42.6kW 25.3kW 16.6kW
ON ON ON
ON ON
ON ON
ON ON
94
90 99
Exhaust temperature
is too high
< (L)WHiC56 only >
Using terms is equivalent
Abnormal
to more than
combustion
5 years
Over Over Over
10.5kW 6.6kW 3.6kW
Over Over Over
10.1kW 7.0kW 3.6kW
Over Over Over
10.8kW 7.2kW 3.6kW
Over Over Over
10.3kW 6.6kW 3.6kW
Over Over Over
12.0kW 8.0kW 4.2kW
Over Over Over
10.8kW 7.2kW 4.2kW
Over Over Over
11.0kW 7.3kW 4.2kW
Over Over Over
10.8kW 7.2kW 4.0kW
ON ON
ON ON