Rinnai REU-V3237WC Operation & Installation Manual

REMOTE CONTROLLER OPERATION

In Use Indicator
Indicates that the hot water tap
is in operation.
Digital Display
Indicates the selected
water temperature.
Error messages flash
in the event of a failure.
Approox Water Temp.
Thermostat
Increases or decreases
Hot water temp.
the desired water
temperature.
MC-91-1US

Diagnostic Use of Controller

1. To Display Maintenance Codes: Press the 'On/Off' button once to turn
the controller off. Press and hold the 'On/Off' button followed by
thermostat button to cycle through the maintenance codes.
2. To Display Water Flow through the water heater: Press the
thermostat button and hold for 2 seconds and then press the 'On/Off'
button while continuing to hold the
3. To Display Outlet Water Temperature: Press the
and hold for 2 seconds and then press the 'On/Off' button while
□ ▼
continuing to hold the thermostat button.
To Change the Temperature Display from °F to °C (or °C to °F)
1. Press the 'On/Off' button once to turn the controller unit off. With the
controller off press and hold the 'On/Off' button until the display changes
to °C (°F), approximately 5 seconds.
To Turn Off the Sound (Mute)
1. To turn the sound off (mute) press and hold both the
thermostat buttons until an audible "beep" is heard, approximately 5
seconds.
Priority Indicator
Indicates whether this
controller has priority
control over the water
temperature
°F / °C
In Use
Priority
Pressing takes control
of the water temperature
by this controller only
Priority
when all taps are off.
On/Off
ON/OFF
Used to switch the
water heater on and off
□ ▲
□ ▲
thermostat button.
□ ▼
thermostat button
□ ▲ □ ▼
and

GAS PRESSURE SETTING AND DIAGNOSTICS

NOTE: For additional installation and commissioning
information refer to Operation / Installation Manual
WARNING

GAS SUPPLY PRESSURES

With all gas appliances in operation at maximum gas rate, the flowing inlet
pressure at the incoming test point on the Rinnai Water Heaters should
read 6"W.C.-10.5"W.C. on Natural Gas and 10"W.C.-13.5"W.C. on Propane
Gas. If the pressure is lower, the gas supply is inadequate and the
appliance will not operate to specification. Check gas meter, regulator,
and pipe work for correct operation/sizing and rectify as required.
REU-V3237W
REU-V3237WC
□ ▲

GAS PRESSURE SETTING

(Ensure gas supply pressure has been checked as above.)
The gas valve is electronically controlled and factory pre-set. Under
normal circumstances it does not require adjustment during
installation. Make adjustments only if the unit is not operating
correctly and all other possible causes for incorrect operation have
been eliminated.
1. Turn 'OFF' the gas supply.
2. Turn 'OFF' 120V power supply.
3. Remove the front cover from the appliance.
4. Check gas type switches (Fig.1) are in the correct position
(dip switch 1 of SW2 'ON' = NG, 'OFF' = LPG)
Note: 'ON' towards front, 'OFF' towards rear.
5. Attach pressure gauge to burner test point, located on the gas control.
(Fig.2)
6. Turn 'ON' the gas supply.
7. Turn 'ON' 120V power supply.
8. Turn the unit 'ON' at the remote controller, select the maximum delivery
temperature and open all available hot water taps full including the
shower.
(CAUTION: Ensure building occupants do not have access to hot water
outlets during this procedure.)
9. Set the Rinnai Water Heater to 'Forced Low' combustion by setting No.7
dip switch of the (SW1) set of dip switches to 'ON'.(Fig.3).
10. Check the burner test point pressure.
11. Remove rubber access plug and adjust the regulator screw on the
modulating valve (Fig.4) as required in Table 1. Replace rubber access
plug.
12. Set the Rinnai Water Heater to 'Forced High' combustion by setting
both No. 7 and No. 8 dip switches of the bottom (SW1) set to 'ON'.
(Fig.5). Ensure maximum water flow !
13. Check the burner test point pressure.
14. Adjust the high pressure Potentiometer (POT) on the Printed Circuit
Board (PCB) as required to the pressure shown in 1.
IMPORTANT: Set dip switches 7 and 8 on the bottom (SW1) to 'OFF'
to return the appliance to 'Normal' combustion. (Fig. 6).
15. Close hot water tap.
16. Turn 'OFF' the gas supply and 120V power supply.
17. Remove pressure gauge & replacing sealing screw.
18. Turn 'ON' the gas supply and 120V power supply.
19. Operate unit and check for gas leaks at test point.
20. Replace the front cover of the appliance.
1
INFORMATION
This appliance should be installed, serviced,
and removed by an authorized person.
During pressure testing of the gas supply piping
ensure gas valve is situated before unit is shut off.
Failure to do so may result in serious
damage to the appliance and possible injury.
Table 1.
Gas Inlet
Forced Low
Water Min./ Max.
Inlet Max.
Nat.G Prop.G Nat.G Prop.G
6"W.C. 10"W.C.
150PSI 0.65"W.C. 0.80"W.C. 2.8"W.C. 3.8"W.C.
10.5"W.C. 13.5"W.C.
Forced High
Nat.G Prop.G