Operation Flow Principle - Rinnai REU-2018W Service Manual

14. Operation Flow Principle

Insert power plug in socket
Fuse/elec.
leak safety device
1
normal?
Yes
Remote control
2
signal normal?
Yes
ON/OFF Switch ON
Set Temp displayed
A
Hot water tap open
a
Water flow ON
3
2.7 L/min or
more
Yes
4 Combustion fan operates
Pre-purge
Initial check
normal?
Yes
Fan rpm check
Yes
9
Sparker ON
10 Main gas sld SV1 Open
11 Change-over sld SV2 Open
12
Modulating valve Open
B
Infinity REU-2425W
No
No
No
4
Fan initial power flow abnormal
4
Combustion fan
rotation abnormal
5
False flame sensed
Solenoid valve circuit faulty
No
Mod. sld valve answer abnormal
6
Thermistor faulty
Thermal fuse melted
7
8
Overheat switch faulty
Not OK
( 12.5 seconds after a )
Pre-purge (2 sec)
Modulating valve Closed
Change-over sld SV2 Closed
Main gas sld SV1 Closed
Sparker OFF
( after 4 seconds )
C
Only applicable when
remote control is connected
- 21 -
Eliminate cause
Pull out power plug
Remote control indicators OFF
ON/OFF Switch OFF
Error display OFF
Water flow sensor stopped
Hot water tap closed
Combustion fan OFF
90 Flashing
61 Flashing
72 Flashing
71 Flashing
52 Flashing
32 Flashing
14 Flashing
61 Flashing
Modulating valve
Change-over sld SV3
Change-over sld SV2
Main gas sld SV1
Sparker
D
Issue 2 - 5/07/04 ©Rinnai
( after 5 seconds )
Closed
Closed
Closed
Closed
OFF