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Mode 2 – Hydronic Heating with Indirect DHW on the System Loop
Refer to
Fig 41.
One 10m NTC sensor cable is supplied with each MVB. If multiple sensors are required these can be
ordered from Rheem.
Connect one sensor to terminals 6 and 7 marked 'System Sensor' and fit the sensor into a sensor well
in the main heating flow and return piping downstream of where the water heater primary flow joins the
main heating flow and return piping, shown as 'S3'. Refer to
Connect the other sensor to terminals 4 and 5 marked 'Indirect DHW Sensor' and fit the sensor into
the indirect DHW storage tank, shown as 'S5'.
Refer to
Wiring the Outdoor Sensor
Connect the water heater pump shown as 'P1' to the terminals marked R1 / 'Water Heater Pump'
located in the Mains Power and Pump connections junction box at the back of the MVB. Refer to
34. Use an external contactor if 3 phase pump is used or the pump current exceeds 8A.
Connect the indirect DHW pump shown as 'P3' to the terminals marked R2 / 'Indirect DHW Pump'
located in the Mains Power and Pump connections junction box at the back of the MVB. Refer to
34. Use an external contactor if 3 phase pump is used or the pump current exceeds 8A.
Optionally connect the system pump shown as 'P2' to the terminals marked R3 / 'System Pump'
located in the Mains Power and Pump connections junction box at the back of the MVB. Refer to
34. Use an external contactor if 3 phase pump is used or the pump current exceeds 8A.
Fig 41: Mode 2 Sensor and Pump Wiring
Refer to Fig
on page 76 if an outdoor sensor is used, shown as 'S4'.
73
Fig
35.
35.
Fig
Fig
Fig
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