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