Raypak 910500, Owner'S Manual And Installation Instructions

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Mode 3 - Hydronic Heating with Indirect DHW on the Water Heater Loop
Refer to Fig 42 .
One 10m NTC sensor cable is supplied with each MVB. If multiple sensors are required these can be
ordered from Rheem.
Fig 42: Mode 3 Sensor and Pump Wiring
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
Fig 35 .
Connect one 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
Fig 35 .
Connect one sensor to terminals
2 and 3 marked
‘Temp to Indirect Storage’
and fit the sensor into a
sensor well on the primary flow line to the indirect DHW
storage tank, shown as ‘S6’. Refer to
Fig 35 .
Refer to Wiring the Outdoor Sensor on page 76
if an outdoor sensor is used, shown as ‘S4’.
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 Fig
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 Fig
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 Fig
34 . Use an external contactor if 3 phase pump is used or the pump current exceeds 8A.
NOTE:
A Tank Aquastat (eg Pump C controller) can be used in lieu of the Indirect DHW Sensor (S5).
See the Versa IC manual for additional details.