2 | Power connection and wiring
20 B1820023_en | Service handbook Lambdatronic H 3200 - T4e
Connecting a circulating pump with valve to the hydraulic module
WARNING! As of module version FRHYU22, one relay output is available at each of the pump outlets in
addition to the triac output. Observe the following connection diagrams to correctly implement the wiring of the
circulating pump!
High efficiency pump with control line (PWM / 0-10V)
On high efficiency pumps with an additional wired control line, the speed control is implemented via the
additional connection for the PDM or 0-10V signal.
PWM
0-10V
N
AO-P1
Pumpe 1Netz
PE
L
N
PE
L
L
r Connect the power supply for the high efficiency pump to output “Pump 1” or “Pump 2” and use the relay
output for phase (L)
r Connect the phase (L) for switching over and the neutral conductor (N) of the valve to the output “Pump 1” or
“Pump 2” using the relay output for the phase (L)
r Connect the phase (L) for continuous supply of the valve (switches the valve back to the initial position) to
the power supply at terminal “L”
r Connect the PWM cable of the high efficiency pump to the corresponding port “AO-P1” or “AO-P2”
Ä Make sure that the cables are configured correctly (polarity) in accordance with the connection diagram of
the pump!
r In the relevant menu, set the activation of the pump to “Field pump PDM + valve” or to “Field pump 0-10V +
valve”
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