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OPERATIONAL COMPONENTS
Wire the temperature sensor using Belden 9841 (0.2mm2) Twisted Pair with Drain wire and foil wrap or equiva-
lent. Must Be suitable for RS485 Standard. Connect to the Temperature senor connections.
Fit the Sensor to either the return pipework before it connects on to the mains in or if this is too far then it can be
fitted on to the cold supply in to the heater. Please note that this sensor must be in direct contact with the pipe
and not fitted on top of lagging.
Wire the Rinnai MC91 through Relay 1. The controller should be connected to C and NC on the controller. You
can now connect the controller on to the Rinnai water heater. (These two connections are not polarity conscious)
Wire the live for the Secondary Return/Recirculation Pump through points C and NO on Relay 2.
Wire in the 240v Mains supply
Controller
Occ -
C-NC - ON
UnOcc -
C-NC - ON
PasOn -
C-NO - OFF
PasOff -
C-NC - ON
Please note that during the pasteurisation cycle the system must be run for a minimum of one hour ONLY when the
system reaches temperature. The time programmes MUST be calculated or tested before the system can be used.
You can programme another Occ to allow the system temperature to drop by using the system heat loss. The water will
simply pass through the Rinnai without firing it up as the water will be above the set temperature on the controller. The
Rinnai controller must be set at the desired temperature for a 24 hour period to allow this to be saved in to the PCB.
Installation Instructions
Operation Sequence
Pump
C-NO - ON
C-NC - OFF
C-NO - ON
C-NC - OFF
10
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