71
Domestic Hot Water Applications With Storage Tank Between 72
o
C and 82
o
C
Fig 38: DHW Sensor and Pump Wiring Between 72
o
C and 82
o
C
One 10m NTC sensor cable is supplied with each MVB.
Connect the sensor to terminals
2 and 3
marked
‘Temp to Indirect Sensor’
and fit the sensor into the
sensor well of the storage tank, shown as ‘S6’, into the second lowest sensor port on the storage tank.
Connect a 10 kOhm resistor to the terminals
6 and 7
marked
‘System Sensor’
, shown as S3.
Fix the Pump C controller (P/No AQ0200127) to the storage tank nearest the master MVB. Fit the
sensor into the lowest sensor port on the storage tank. Fit the capillary bulb ECO supplied with the
Pump C controller into the highest sensor port on the storage tank.
Remove the jumper wire from terminals
17 and 18
marked
‘External Interlock’ and c
onnect double
insulated 2 wire cable to the VFC Output terminals marked
‘N/O and C’
in the Pump C controller
.
Connect the primary pump shown as ‘P1’ to the terminals marked
R3 / ‘Water Heater Pump’
located
in the Mains Power and Pump electrical connections junction box at the back of the MVB. Refer to
. Use an external contactor if 3 phase pump is used or the pump current exceeds 8A.
Fig 39: Pump C Controller Wiring
C
A
N
A1
N/O
A 2
N/C
N
N/O
N/C
VFC OUTPUT
240V OUTPUT
10A MAX
240V SUPPLY
10A
