Infinity REU-VRM3237WG / HD250e REU-VRM3237WC
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24
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Issue 1 - 19/05/09 ©Rinnai
9.
Water Flow Servo Circuit
(G
6
)
a.) Disconnect relay connector (G
6
), and measure resistance between Red and Blue of
Water Flow Servo.
Normal:
10~30
If normal, proceed to b.
Faulty:
Replace Water Flow Servo and Water Flow Sensor.
b.) Disconnect relay connector (G
6
), and measure voltage between Orange (+) and Grey
(-) on PCB unit side.
Normal:
DC11~13V
If normal: proceed to c).
Faulty:
Replace PCB unit.
c.) Measure voltage between Brown and Grey with relay connector (G
6
) connected (with
no water flowing, water flow servo fully open).
Normal:
DC4~6V
Faulty:
Replace Water Flow Servo with Water Flow Servo.
d.) Measure voltage between Yellow and Grey with relay connector (G
6
) connected (with
no water flowing, water flow servo fully open).
Normal:
< DC1.0V
Faulty:
Replace Water Flow Servo and Water Flow Sensor.
10. Heat Exchanger Outlet Thermistor Circuit (G
4
)
Check Heat Exchanger Outlet Thermistor if error indicator “33” is displayed.
Disconnect relay connector (G
4
) and measure resistance between White and Pink.
Circuit Break:
Resistance > 1M
Short Circuit:
Resistance < 1
If normal, proceed to Water Flow Servo Circuit
If
faulty,
replace Heat Exchanger Outlet Thermistor.
Note:
For controller readout of thermistor temperature whilst operational refer
maintenance monitor (chapter
17)
No.
11.
