Rinnai REU-2007W, Руководство по обслуживанию

Страница: 48 / 69

Infinity REU-2007,2008,2408,2424 - 43 - ©Rinnai
3) Is the modulating valve operating normal?
a. # Disconnect the modulating valve festoon
terminals and measure the resistance at the
terminals.
Normal: 60 ~ 100
If normal, go to (b.
Faulty: Replace the modulating valve.
b. Re-connect terminal and measure the pink
~ pink voltage at the modulating valve
festoon terminal.
Normal: DC 0.5 ~ 25 V
If normal, go to (c) below.
Faulty: Replace PCB unit.
c. Investigate the change in gas secondary
pressure when the remote control preset
temperature is altered from 37 to 75 C.
Normal: If the secondary pressure
changes, proceed to check item 4) below.
Faulty: Replace the modulating valve.
4) Is the water flow servo normal? (2008/2408)
a. # Disconnect connector and measure the
red ~ blue resistance on the water flow
servo side.
Normal: 10 ~ 30
S
If normal, go to b.
Faulty: Replace the water flow servo with
water flow sensor.
b. Disconnect connector, and measure the
voltage between orange (+) and grey(-) on
the water flow control side.
Normal: DC 11 ~ 13 V
If normal, go to (c).
Faulty: Replace the PCB unit.
c. With connector (E
1
) connected (do not
turn water ON... wait for the water flow
servo to return to fully open), measure the
voltage between brown and grey.
Normal: DC 4 ~ 6V
Faulty: Change water flow servo with
sensor.
d. Leaving the relay connector (E
1
)
connected (do not turn water ON... wait for
the water flow servo to return to fully
open), measure the voltage between yellow
and grey.
Normal: Less than DC 0.5 V
Faulty: Change water flow servo with
sensor.
Ω
°