REU-VR1620WG / REU-VR1620WB / REU-VR1620WS / REU-VR2024WG
- 23 -
Issue 1 - 5/08/09 ©Rinnai
10. Water Flow Sensor
a) Measure voltage between Red-Black of relay connector (
E
2
).
Normal:
DC 11~13V
If normal, proceed to b).
Faulty:
Replace PCB.
b) Measure voltage between Yellow-Black of relay connector (
E
2
).
Normal:
DC 4 ~ 7 V
If normal, proceed to 2.
Faulty:
Replace water flow sensor.
Note:
For controller readout of water flow whilst operational refer maintenance monitor.
(Chapter 15) No. 1.
11. Water Flow Control Device Circuit
a)
Disconnect relay connector (
E
5
), and measure voltage between Red (+) and Black (-) on PCB
unit side (while operating).
Normal:
DC11-13V
If normal: proceed to
b.).
Faulty:
Replace PCB unit.
b)
Measure resistance between Black and Yellow with relay connector (
E
2
) connected (with no
water flowing, water flow servo fully open).
Normal:
DC4~6V (Pulse 20~320Hz)
Faulty:
Replace Water Flow Servo. If normal proceed to
c).
c)
Measure voltage between Brown and Grey with relay connector (
G
1
) connected.
Normal:
DC4~6V
Faulty:
Replace Water Flow Servo.
12. Thermistor Circuit
Check Thermistor if error code “32” is displayed.
Disconnect relay connector (
E
4
) and/or (
E
3
) and measure resistance White -White.
When disconnected
: resistance >1M
When short circuit:
resistance < 1
Operating:
Check Heat exchanger outlet thermistor
Resistance matches table below.
Faulty:
Replace hot water outlet thermistor.
If normal proceed to Flame Rod circuit.
Faulty:
Replace Thermistor.
Note:
For controller readout of thermistor temperature whilst operational refer maintenance monitor.
13. Surge Protector (F
1
)
a)
Check the electrical fuses between
F
2
and
F
3
. Normal resistance across fuse < 1
If blown,
replace with fuses of the correct rating (240V, 3A). If okay, go to
b).
b)
Check supply voltage at
F
2
. Voltage between blue and brown wires 207 - 264 V. If supply
voltage incorrect check power supply to appliance. If okay go to
c).
c)
Check voltage at
F
1
. Voltage between blue and brown wires 207 - 264V.
If voltage is zero repeat
a).
If fuses are okay replace Surge Protector.
14. Anti-frost Heater Circuit
Normal
Temperature
15
o
C
30
o
C
45
o
C
60
o
C
105
o
C
Resistance
k
6.4~7.8 k
3.6~4.5 k
2.2~2.7 k
0.6~0.8 k
Summary of Contents for REU-VR1620WB
Page 16: ...REU VR1620WG REU VR1620WB REU VR1620WS REU VR2024WG 11 Issue 1 5 08 09 Rinnai REU VR2024...
Page 48: ...REU VR1620WG REU VR1620WB REU VR1620WS REU VR2024WG 46 Issue 1 5 08 09 Rinnai...
Page 49: ...REU VR1620WG REU VR1620WB REU VR1620WS REU VR2024WG 47 Issue 1 5 08 09 Rinnai...
Page 50: ...REU VR1620WG REU VR1620WB REU VR1620WS REU VR2024WG 48 Issue 1 5 08 09 Rinnai...
Page 51: ...REU VR1620WG REU VR1620WB REU VR1620WS REU VR2024WG 49 Issue 1 5 08 09 Rinnai REU VR2024WG...
Page 52: ...REU VR1620WG REU VR1620WB REU VR1620WS REU VR2024WG 50 Issue 1 5 08 09 Rinnai...
Page 53: ...REU VR1620WG REU VR1620WB REU VR1620WS REU VR2024WG 51 Issue 1 5 08 09 Rinnai...
Page 54: ...REU VR1620WG REU VR1620WB REU VR1620WS REU VR2024WG 52 Issue 1 5 08 09 Rinnai...
