Fitting The External 3-Way Valve; Electrical Installation - Vaillant 00 2003 6743 Manual De Instrucciones

4 Installation
Installation as a distributor in the heating flow line from
the heater.
Branch AB <—> A: to the hot water standby zone;
valve spring under load
Branch AB <—> B: to the central heating puffer volume,
valve spring released
Directed return in the heating return line is handled by
the 3-way valve integrated in the heat pump.
4.3

Fitting the external 3-way valve

b
Caution!
Risk of damage from unsuitable tools!
Improper installation and/or unsuitable tools
can cause damage to property (such as bro-
ken pipes and water escaping)!
>
When fastening or undoing threaded con-
nections, always use open-ended spanners
(open-end wrenches) of the right size.
>
Do not use pipe wrenches, extensions etc.
>
Remove the parts from their packaging.
>
Make sure that the white switch lever on the motor
head is in its starting position (up, away from the
valve).
>
Push the connector pipes into the compression fit-
tings on the valve body.
b
Caution!
Risk of damage from leaks!
Mechanical stress on connecting lines can
lead to leaks, which may result in damage to
the heat pump.
>
Avoid mechanical stress on connecting
lines.
>
First screw the connector pipes in place with the cap
nuts on the piping.
>
Then tighten the compression fittings on the valve
body.
i
Note!
If necessary, you can remove the external
3-way valve later without dismantling the
piping.
6
4.4

Electrical installation

>
Plug the connector on the connection cable into the
3-way valve (Molex connector).
>
Connect the connection cable to the eBUS contact on
the heat pump (¬ Installation instructions for the
heat pump). If the contact is already occupied, use an
eBUS distributor.
>
Set the correct hydraulic layout on the heat pump's
controller (¬ Installation instructions for the heat
pump).
>
Set the correct cylinder type on the heat pump's
controller (¬ Installation instructions for the heat
pump).
The external 3-way valve is controlled parallel to the
internal 3-way valve.
Installation instructions for external 3-way valve 0020037633_03