Electrical Connections; Control Unit - REMEHA Calenta 25s Installation And Service Manual

Calenta 25s - 28c - 35s - 40c
4.9

Electrical connections

040412 - 7600585-01
4.9.1.

Control unit

The boiler is not line- and neutral sensitive. The boiler is fully pre-
wired. All external connections can be made on the connection
connector (low voltage). The main characteristics of the control unit
are described in the table below.
Power supply voltage
Rating of the main fuse F1 (230 VAC) 6.3 AT
Fuse rating F2 (230 VAC)
Fan-DC
CAUTION
The following boiler components are at a voltage of
230V:
Electrical connection of the heating pump (Central
4
heating) (if used).
Electrical connection of the combined gas valve unit.
4
Electrical connection of the 3-way valve (if used).
4
The majority of components in the control panel.
4
Ignition transformer.
4
Connection of the power supply cable.
4
The boiler is fitted with an earthed plug (cable length 1,5 m) suitable
for a 230VAC/50Hz power supply with live/neutral/earth system. The
power supply cable is connected to the X1 connector. A spare fuse
can be found in the housing of the control system.
CAUTION
When the power supply cable has to be replaced, it
4
must be ordered from Remeha.
The boiler plug must be accessible at all times.
4
It is possible to connect various control, safety and regulation systems
to the boiler. The standard control PCB (PCU) can be extended with
the following, for example:
4 The 0-10V control PCB (accessory IF-01). For installation behind
the left hand cover on the control panel.
4 The extended control PCB (accessory SCU-S02). For installation
in a box (accessory).
¼ For the optional PCBs, see chapter: "Optional electrical
connections", page 46
4. Installation
230 VAC/50Hz
2 AT
27 VDC
39