CTC Union GSi 600 Series, Installation And Maintenance Manual

Page: 48 / 136

48 CTC GSi 600
8.6 Heating circuit 2 (alt. Passive
cooling)
Primary flow sensor 2 (B2) NTC 22k is connected to terminal blocks
G15-G16 on the sensor terminal block.
fit the primary flow sensor to the primary flow pipe, ideally after the circulation
pump.
The sensing part is towards the end of the sensor (see sketch).
• Attach the sensor using the cable tie provided.
• Ensure that the sensor makes good contact with the pipe.
Apply contact paste to the front part of the sensor between the sensor
and the pipe if good contact is otherwise difficult to obtain.
• Important! Insulate the sensor using pipe insulation.
• Connect the cables to the sensor terminal block at position G15–G16.
Mixing valve 2 (Y2) is connected to terminals blocks A15, A16 and zero on
the sensor terminal block:
Black Open Terminal block A15
Brown Close Terminal block A16
Blue Zero N
Radiator pump 2 (G2) is connected to terminals block A36 as well as zero
and earth on the sensor terminal block:
Brown Terminal block X2/ A36
Blue Zero X2/N
Yellow/green Earth X2/PE
Passive cooling is adjusted using primary flow sensor 2 (B2), which then
means that heating circuit 2 and cooling cannot be used simultaneously.
For a combined underfloor heating and passive cooling system, the 3-way
valve (Y60) must be connected as follows:
Black Relay output Terminal block X2/ A36
Brown Phase Terminal block X2/L1
Blue Zero Terminal block X2/N
Contact paste Sensory elementSensor
Primary flow pipe Cable tie Insulation
Sensor cable