Rinnai HD55e Low NOx, Installation And User Manual

Page: 10 / 64

10
TEMPERATURE CONTROLS
Remote temperature controllers provide control over the water temperature. Rinnai water
heaters can be operated with 1, 2, 3, 4 or no temperature controllers.
The
MC-91-3A controller can be locked by pressing the Transfer button and the
up-button together for 5 seconds. A beep will sound confirming that the controller
is locked. The display will alternately show “LOC”, the temperature setting, and a
diagnostic code if one has been activated. All of the controllers in the system are
also locked.
Each time a button is pressed, a BEEP will sound. The BEEP sound
can be muted by depressing the Temperature Controller Up and
Down buttons simultaneously for more than 5 seconds. This can be
done for each Temperature Controller. To return to original settings,
repeat this step.
Safety features
Whilst the hot water tap is open, the
following safety features apply:
 Temperature selection cannot be
transferred.
 The temperature setpoint on the
controller with priority can always be
lowered, but the setpoint can only be
raised to 43°C.
 Other controllers are unable to take
priority
or change the delivery
temperature of the water.
 If off, the controller cannot be turned on.
The temperature of the outgoing
water is constantly monitored by
a built in sensor.
If the temperature of the outgoing
hot water rises to more than 3ºC above the
selected temperature shown on the digital
display, or the preset limit if controllers are
not fitted, the burner will automatically go
out.
The red “In Use” indicator will also go out.
The burner will ignite again once the
outgoing hot water temperature falls to that
shown on the digital display (or the pre-set
limit of the Rinnai HDC heater).
NOTE
NOTE
NOTE