Noritz WHiC56 User manual

(L)WHiC56,(L)WHi49
(L)WHiCX56,(L)WHiX49
Service Manual
• This manual must be read by Service personnel repairing
the above appliance models.
• Take this manual with you when attending Service study
meetings.
• The specifications and contents of this manual may
change at any time without prior notication.
Never short-circuit any safety devices
Overview of Condensing Gas Water Heater ....................................................................................... 2
Hot Water Supply Capabilities ............................................................................................................. 3
Pressure Loss Characteristics ............................................................................................................. 5
Component Diagrams.......................................................................................................................... 6
Principle of Operation .......................................................................................................................... 10
Remote Controller ............................................................................................................................... 13
Initital Operation .................................................................................................................................. 15
Setting Hot Water Temperature ........................................................................................................... 16
Sequence ............................................................................................................................................ 17
Wiring Diagram .................................................................................................................................... 19
Checkpoints and Measures if a Breakdown Occurs ............................................................................ 21
Installation ........................................................................................................................................... 52
Regular Maintenance .......................................................................................................................... 56
Water Quality ....................................................................................................................................... 59
Procedure for Flushing the Heat Exchanger ....................................................................................... 60
Draining Water from Unit ..................................................................................................................... 61
Specications ...................................................................................................................................... 64
Dimensions .......................................................................................................................................... 68
Installation Check ................................................................................................................................ 73
Parts .................................................................................................................................................... 77
CONTENTS
Printed April, 2018
KS-18-0001
INSTANTANEOUS GAS WATER HEATER

Cold water Cold water
Gas Gas Hot water Hot water
Condensate
Combustion gas
About 200°C
About 200°C
Exhaust Exhaust
About 50°C
Conventional
type
Condensing
Gas Water
Heater
Water is heated
using the exhaust
gas which is about
200°C
.
Primary heat exchanger
Primary heat exchanger
Secondary heat exchanger
Drain Trap
Combustion gas
About 200°C
The condensing gas water
heater discharges condensate.
When heat from the exhaust gas is collected
within the secondary heat exchanger,
condensation occurs from moisture in the
exhaust gas and the resulting water is
discharged from the drain pipe (approx.
100cc/min maximum). It is not a water leak.
Do not plug or block the drain line as it must
always be allowed to freely flow.
Overview of Condensing Gas Water Heater
This water heater is a high efficiency, fully condensing appliance. Unlike a traditional water heater,
a condensing type captures heat from the exhaust gas and uses it to preheat the incoming cold
water as it passes through the secondary heat exchanger as illustrated below.
The condensing gas water heater
tends to show white steam.
After the exhaust gas passes through the
secondary heat exchanger, it becomes low in
temperature and moisture rich which tends to
produce steam at the vent discharge terminal.
This is a normal occurrence.
During combustion, white
steam may often be seen.
This is normal.
Drain pipe
(Installation example)
Condensate
comes out from
here.
- 2 -
Overview of Condensing Gas Water Heater

(Winter) Inlet water temp. 5°C
Set temperature (°C)
90
80
70
60
50
40
30024681012141618202224262
83
0
Flow Rate (L/min)
(Spring / Fall) Inlet water temp. 15°C
Set temperature (°C)
90
80
70
60
50
40
30
Flow Rate (L/min)
0246810 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44
(Summer) Inlet water temp. 25°C
Set temperature (°C)
90
80
70
60
50
40
Flow Rate (L/min)
0246810 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44
- 3 -
Hot Water Supply Capabilities
■ (L)WHiC56,(L)WHiCX56

(Summer) Inlet water temp. 25°C
Set temperature (°C)
90
80
70
60
50
40
Flow Rate (L/min)
0246810 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40
(Winter) Inlet water temp. 5°C
Set temperature (°C)
90
80
70
60
50
40
30024681012141618202224262
83
0
Flow Rate (L/min)
(Spring / Fall) Inlet water temp. 15°C
Set temperature (°C)
90
80
70
60
50
40
30
Flow Rate (L/min)
0246810 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44
- 4 -
■ (L)WHi49,(L)WHiX49

Bypass Flow Control Valve Close
Set temperature : 55°C or higher
(Storage Tank Setting W/ System
Controller : 75-80°C)
Bypass Flow Control Valve Open
Set temperature : 50°C or less
(Storage Tank Setting W/ System
Controller : 70°C or less)
0 0
3.0
6.1
9.1
12.2
15.2
18.3
0 3.8 7.6 11.4 15.1 18.9 22.7 26.5 30.3 34.1 37.9 41.6 45.2
0.34
0.69
1.03
1.38
1.72
2.07
Pressure Loss (bar)
Flow Rate (L/min)
Pressure Loss (m of head)
Bypass Flow Control Valve Open
Set temperature : 50°C or less
(Storage Tank Setting W/ System
Controller : 70°C or less)
Bypass Flow Control Valve Close
Set temperature : 55°C or higher
(Storage Tank Setting W/ System
Controller : 75-80°C)
0 3.8 7.6 11.4 15.1 18.9 22.7 26.5 30.3 34.1 37.9 41.6 45.2
Flow Rate (L/min)
0
0.34
0.69
1.03
1.38
1.72
2.07
2.41
Pressure Loss (bar)
0
3.0
6.1
9.1
12.2
15.2
18.3
21.3
24.4
Pressure Loss (m of head)
- 5 -
Pressure Loss Characteristics
■ (L)WHiC56,(L)WHiCX56
■ (L)WHi49,(L)WHiX49

- 6 -
Component Diagrams
■ (L)WHiC56

- 7 -
■ (L)WHiCX56

- 8 -
■ (L)WHi49

- 9 -
■ (L)WHiX49

㻞㻞㻜䡚㻞㻠㻜㼂㻭㻯
WHiC56,LWHiC56
WHiCX56,LWHiCX56
Condensing Model
- 10 -
Principle of Operation

WHi49,LWHi49
WHiX49,LWHiX49
Standard Non Condensing Model
㻞㻞㻜䡚㻞㻠㻜㼂㻭㻯
- 11 -

1.Using hot water
(1) Tu rn the ON/OFF button on the remote controller to ON.(The ON/OFF button will turn on the light.)
(2) Open the hot water valve to be used. If the water flow sensor detects a water flow above the mini-
mum operation water flow volume, pre-purge(purging gas remaining in the combustion chamber
before ignition) will be carried out for a fixed duration of time. After this the gas solenoid valve will
open, the ignition device will activate, and ignition will take place in the burner. (The bypass flow
control valve is always waiting in the normally "open" position.)
(3) When the flame rod(flame sensor) detects a flame, the ignition device will stop sparking.
(4) The hot water temperature will automatically be adjusted to the temperature selected with the temp
.
button.
(5) Close the hot water valve that was used.
(6) When the water flow sensor detects a water flow below the minimum operation water flow, the gas
solenoid valve will close and the flame will go out. Post-purge(purging gas remaining in the com-
bustion chamber after the flame goes out) will be carried out for a fixed duration of time, and then
the unit will stop.
(7) After using, the ON/OFF button on the remote controller should be turn OFF.
(The ON/OFF button will turn off the light.)
2. Error Code
s
If by any chance the flame rod does not detect a flame or the high limit switch activates, the gas sole-
noid valve will close and extinguish the flame.
The display will show an error message to inform you of safe operation.
The safe operation reset procedure is to press the ON/OFF button so it turns OFF, and then press it
again to turn it ON.
3.
Miscellaneous
Before going to bed or at other times when the unit will not be used for a prolonged period of time, be
sure to press the ON/OFF button on the remote controllers, make sure that the display has gone off,
and then close the primary gas solenoid valve.
- 12 -
■ Explanation of operation

Activates the automatic water heater power
“ON” or “OFF” setting as determined by the
user selected schedule.
For turning the water heater
on/off.
( Next page)
Locks remote controller
operation.
Check the status of the
system or the number of
installed units
.
Returns to the previous
screen while making system
settings or checking status.
Confirms changes
made by the user.
For setting the hot water
temperature, the flow
meter alarm, and
other settings.
Remote Controller
Part Number
* Use to change system
settings or to return to
the home screen.
*
If you press the menu button
and press the temperature
setting buttons,
is sometimes displayed,
however, do not use this
mode as it meant for
installation or service
personnel only.
Stops the tone that is emitted
when an error occurs.
Cover shown in
the open position.
Main Controller (RC-9018M) <Optional>
The remote controller will emit a tone when a button is pressed.
Prog Button / Indicator (Red)
Power ON /OFF Button
/ Indicator (Green)
Menu Button
Back Button
Alarm Off Button
/ Indicator (Red)
Speaker
Display Screen
Status Button
Lock Button
Enter Button
Hot Water Temperature
Setting Buttons
The part number
is printed on the
surface of the cover.
- 13 -
Remote Controller

(Ex.: AM10:15)
Normally the clock display is not shown when
the power ON/OFF button is "OFF".
* This setting can be changed so that the clock is displayed
even when the power button is turned "OFF".
* The screen display shown below is for illustration purposes only.
The actual display will vary depending on how the water heater is being used.
* After a button is pressed, the display will gradually become darker to prevent unnecessary power
consumption by the remote controller.
(Ex.: 40°C)
The flame symbol is displayed during
combustion when using hot water or
recirculation functions.
A number will flash if a
failure occurs.
<Home Screen Example>
The home screen is displayed when the button is "ON".
Normally, the hot water temperature and the clock, etc.
are displayed.
Flame Symbol
During normal operation, the set
temperature is displayed.
Display for Recirculation Operation
Display for High Temperature
Temperature Setting
Clock Display
Error Code
* For systems that use recirculation operation, the symbol
is displayed when the power ON/OFF button is set to "ON".
* It is displayed during the recirculation operation.
Display for Temperature Setting
The lock symbol is displayed
when the remote controller is
locked.
Locked Display
The clock symbol is
displayedwhen the
recirculation timer is
activated.
Recirculation Timer
Displays when the set temperature
is 55°C or higher.
Screen Display
What is the home screen?
- 14 -

Before the first use of your water heater, make the following preparations.
Follow steps 1 through 4
1
2
3
4
Open the water supply valve.
CLOSED
CLOSED
OPEN
OPEN
Open a hot water fixture to confirm that
water is available, and then close the
fixture again.
Hot water fixture
Open the gas supply valve.
Turn on the power.
Ex. WHiCX56, LWHiCX56
- 15 -
Initial Operation

< Display when high temp is set >
Blinks for approximately 10 seconds Lit.
(Ex.: 55°C)
(°C: )
The temperature settings below are examples. The temperature setting
necessary depends on the usage, the length of piping and the time of year.
*Initial factory setting is 40°C
When using °C mode:
* The indicator is lit.
* The previously set hot water
supply temperature is shown.
1button is "ON".
2
Set the temperature using
the buttons inside
the cover
.
(Ex.: 40°C)
(Ex.: 42°C)
Cover shown in
the open position.
* If is displayed, hot water
will be discharged at the temperature of
the storage tank.
Operation Screen Display Description
• Hot water temperatures shown are approximate and may differ from the actual temperature at the fixture
depending on external factors such as the season and length of piping in the system.
• When low temperatures are set (for washing dishes, etc.), if the incoming water temperature is already quite
high, it may be difficult to ensure the outgoing water temperature is as per the setting.
• Please check the temperature displayed before using any hot water.
Be especially careful using hot water after the set temperature has been changed.
• When the hot water temperature is adjusted using thermostat controlled water mixing valves, set the
temperature on the remote controller approximately 10°C higher than the required temperature to ensure the
appropriate fixture temperature.
If fixtures incorporate mixing valves, set the temperature higher than usual.
*
For applications that occasionally require a higher temperature setting, locate the remote controller in a convenient location.
* Consult local codes for minimum operating temperatures.
Shower, hot water supply, etc.
Washing
dishes, etc. High temperature
37 38 39 40 41 42 43 44 45 46 47 48 50 55 60 65 70 75 80 85
Temperature Setting Options
- 16 -
Setting Hot Water Temperature

Water heating
(1䃛A or more)
Flame Rod circuit abnormality
open or shorted
Water Inlet Thermistor
YES
> 2.0 L/min
YES
NO
normal
Initial check
Hot water fixture opened
Set. Temp. indicates on the display
Bypass Flow Control Valve and
Main Flow Control Valve open
Connect power
31
32
71
Fix problem
72
Power ON/OFF button turn OFF
Display
turns OFF
Disconnect power
Water Flow Sensor detects
Error code stops flashing
YES
NO
14
NO
YES
Self-diagnosis
Normal combustion
NO
YES
The unit will continue operate with the error code blinking
on the Optional Remote Controller.
Warning indication
1
4
5
6
10
Bypass Flow Control Valve and
Main Flow Control Valve move to
initial position setting
device normal
Lightning safety
NO
YES
YES
NO
YES
90
possible
Self-diagnosis
Normal combustion
possible
Self-diagnosis
Normal combustion
possible
Overheat prevention
device (Thermal fuse) normal
(Less than 221°C)
Main Flow Control Valve
YES
normal
NO
65
YES
NO
66
Setting 60°C or higher
YES
NO
Bypass Flow Control Valve
closes
7
33
35
2
3
3
Warning indication
Warning indication
Condensate Container clogging
< Condensing Model only >
29
Power ON/OFF button turn ON
Bypass Flow Control Valve
normal
Water Outlet Thermistor
abnormality
Circuit board
70
8
Heat Exchanger Thermistor
Exhaust Thermistor
open or shorted
<(L)WHiC56 only >
Gas Proportioning Valve
drive circuit abnormality
Hot water fixture closed
open or shorted
open or shorted
5years
Use for less than
Note 2)
17
NO
Maximum output limited
10
90
99
NO
Warning indication
Warning indication
Primary Gas Solenoid
Valve closes
closes
closes
closes
Burner ON lamp
Gas Proportioning Valve
Gas Solenoid Valve-2
Gas Solenoid Valve-3
goes off
Gas Solenoid Valve-1
closes
Hot water fixture closed
YES
NO
Fan Motor post purge
Main Flow Control Valve
opens fully
Fan Motor stops
since hot water fixture
Has 6min. passed
closed
YES
NO
Thermistor
Heat Exchanger
< 40°C
NO
sensor detects
< 1.4 L/min
closes
Bypass Flow Control Valve
Water flow
Gas Solenoid Valve-4
closes
Shutdown
Shutdown procedure
A B
- 17 -
Sequence

Total water flow (L/min)
Approx. 2.5 × 25
K >
+ water inlet temperature (°C)
Set temperature
K
If the inlet temp is less than 50°C
Set temp +5°C
37°C or more
or if the following statements
about K are true, the inlet temperature
will be normal (YES).
*1
41.9kW
Gas Solenoid
Valve-1 ON
*2
Gas Solenoid
Valve-2 ON
Gas Solenoid
Valve-3 ON
Gas Solenoid
Valve-4
ON
26.3kW
ON
ON
15.2kW
ON
ON
ON
10.8kW
ON
ON
7.3kW
ON
4.0kW
ON
42.0kW 25.8kW 16.4kW 11.0kW
7.2kW
4.2kW
41.2kW 24.8kW 16.6kW 7.2kW
36.6kW
Over
24.1kW 15.3kW 10.8kW
8.0kW 4.2kW
WHi49
LWHi49
Over Over Over
Over Over
Over Over Over Over
Over Over Over Over Over Over
Over Over
Over
Over Over Over
WHiX49
LWHiX49
WHiC56
LWHiC56
WHiCX56
LWHiCX56
38.4kW
Over
24.2kW
Over
17.4kW
Over
10.5kW
Over
6.6kW
Over
3.6kW
Over
36.1kW
Over
23.5kW
Over
16.2kW
Over
10.1kW
Over
7.0kW
Over
3.6kW
Over
3.6kW
Over
3.6kW
Over
4.2kW
Over
7.2kW
Over
37.0kW
Over
21.6kW
Over
10.3kW
Over
6.6kW
Over
16.7kW
Over
12.0kW
Over
10.8kW
Over
16.6kW42.6kW 25.3kW
Over Over Over
NO
Safety device triggered
Flow is adjusted
than setting
outlet water temp. less
Fan speed
YES
( )
others:after 2 sec.
1st, 4th, 7th:after 5 sec.
detects 䍻
1μA
Flame Rod
Igniter sparks
Inlet water high
*1
Fan speed
33
14
16 31
29
Fan Motor stops
11
12
61
(target㻌㼼200 rpm)
(After 60 sec)
Burner ON Indicator
normal
20
61
to more than
Using terms is equivalent
Main Flow Control Valve
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
5
11
13
14
16
17
10
15
1
657
12
temperature check
At max, kW is
goes off
closes
Gas Solenoid Valve-3
Gas Solenoid Valve-2
opens
Primary Gas Solenoid
Valve opens
opens
Fan Motor ON
lights
Gas Solenoid Valve-1
opens or closes
Primary Gas Solenoid
Valve closes
Gas Solenoid Valve-1
closes
Gas Proportioning Valve
closes
goes off
closes
Gas Solenoid Valve-2
closes
Primary Gas Solenoid
Valve closes
Gas Solenoid Valve-1
closes
(0.45μA or less)
not detect a flame
Flame Rod does
is too high
Outlet water temp.
20
High limit switch
is normal
YES
NO (3rd)
(5 times or less)
YES
Extinction
NO
Re-ignition
(8 times or less)
Gas Solenoid Valve-1
15
closes
Gas Solenoid Valve-3
opens
activates
32
6
*3 When the present fan speed is 500rpm more or less than target speed.
abnormality
(as necessary) *2
Overheat prevention
device (Thermal fuse)
triggered (221°C or more)
2
94
12
16
Gas Solenoid Valve-2
opens or closes
(as necessary) *2
18
Gas Solenoid Valve-3
opens or closes
(as necessary) *2
19
Gas Solenoid Valve-4
opens or closes
(as necessary) *2
Gas Solenoid Valve-2
Gas Solenoid Valve-4
closes
Gas Solenoid Valve-4
closes
99
Condensate Container
abnormality (check for
blockage and
electrode connections)
Water Inlet
Thermistor
open or shorted
open or shorted
Thermistor
open or shorted
Heat Exchanger
combustion
Abnormal
71
90
Gas Solenoid Valve
abnormality
5 years
Burner ON Indicator
Burner ON Indicator
*3
Gas Proportioning Valve
Gas Proportioning Valve
closes
Igniter stops sparking
Igniter stops sparking
8
35
Exhaust Thermistor
open or shorted
9
Exhaust temperature
is too high
<
(L)WHiC56 only >< (L)WHiC56 only>
Water Outlet
Thermistor
< Condensing Model only >
A B
- 18 -

<(L)WHi(X)49, (L)WHiC(X)56 Only>
<(L)WHiC(X)56 Only>
<(L)WHi(X)49 Only>
<(L)WHiC(X)56 Only>
<(L)WHiC56 Only>
<(L)WHiC56 Only>
<(L)WHi(X)49 Only>
<(L)WHiC56 Only>
<(L)WHiC(X)56 Only>
<(L)WHiC(X)56 Only>
<(L)WHi(X)49 Only>
<(L)WHiC(X)56 Only>
- 19 -
Wiring Diagram

<(L)WHiC(X)56 Only>
<(L)WHiC56 Only> <(L)WHiC56 Only>
- 20 -