Raypak 910500 Owner's Manual And Installation Instructions page 72

Hydronic Heating Applications
Mode 1 – Hydronic Heating Only
Refer to Fig 40.
One 10m NTC sensor cable is supplied with each MVB.
Connect the 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
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.
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 40: Mode 1 Sensor and Pump Wiring
on page 76 if an outdoor sensor is used, shown as 'S4'.
72
Fig 35.
Fig
Fig