REMEHA Quinta Pro series Installation, User And Service Manual page 37

Fig.33 SCU-S02 PCB
F 4AT
SCU-SO2
X1
X3
Pump 3wV EgV
N L N C D N L
Pump 3wV EgV
N L N C D N L
123157 - v.06 - 24022015
D3
X2
X4 X5
Status
Nc C No Tsol Gps Hru
Nc C No Tsol Gps Hru
AD-0000057-01
Connection options for the PCB (SCU-S02)
If the boiler is fitted with the PCB (SCU-S02), then this PCB is automatical­
ly recognised by the boiler's automatic control unit.
Note
On removing this PCB, the boiler will show error code
prevent this error, an auto-detect must be carried out after remov­
ing this PCB.
For information on carrying out an auto-detect, see: Carrying out an auto-
detect, page 51
The status indicator D3 at the top right of the PCB indicates the status:
Continuous signal: PCB working normally
Flashing signal: no connection
No signal: no power or faulty PCB (check the wiring)
Control of external CH pump (pump)
An external central heating pump can be connected to the pump terminals
of the connector. The maximum power consumption is 400 VA.
Control of external three-way valve (3wV)
The external three-way valve (230 VAC) can be used when connecting an
indirectly heated calorifier. The neutral position of the three-way valve can
be set using parameter
The three-way valve is connected as follows:
N = neutral
C = central heating
D = calorifier
Connecting external DHW pump (3wV)
It is also possible to connect an external DHW pump to the terminals 3wV.
Connect the pump as follows:
N = N pump
D = L pump
= PE pump
Caution
If the neutral position of the three-way valve is adjusted with pa­
rameter , the pump must be connected as follows:
N = N pump
C = L pomp
= PE pump
Control of external gas valve (EgV)
If there is a heat demand, an alternating voltage of 230 VAC, 1 A (maxi­
mum) becomes available on the EgV terminals of the connector to control
an external gas valve.
Connecting the minimum gas pressure switch (Gps)
The minimum gas pressure switch blocks the boiler if the gas inlet pres­
sure becomes too low.
1. Connect the minimum gas pressure switch to the Gps terminals of
the connector.
The presence of the gas pressure switch must be set using parameter
.
Connecting a heat recovery unit (Hru)
1. Connect the wires from the heat recovery unit to the Hru terminals of
the connector.
The presence of the heat recovery unit must be set using parameter
.
.
6 Installation
. To
37