Electrical Connections 12; Mains, External Controls And Pump Connections (Mains Voltage); Electrical Connections - Testing - Vaillant ecoMAX pro SERIES Instructions For Use Installation And Servicing

12 Electrical Connections
Warning!
This boiler must be earthed.
All system components must be of an approved type,
and meet the requirements of the current IEE Wiring
Regulations, and in IE the current edition of the ETCI
rules. Electrical components have been tested to meet
the equivalent requirement of the BEAB.
Connection of the whole electrical supply must be
through a common isolator.
Isolation should preferably be by a double pole switched
fused spur box having a minimum contact separation of
3mm on each pole. The fused spur box should be readi-
ly accessible and preferably adjacent to the boiler. It
should be identified as to its use. A fused three pin plug
and shuttered socket outlet may be used instead of a
fused spur box provided that:
a) They are not used in a room containing a fixed bath
or shower.
b) Both the plug and socket comply with the current
issue of BS1363.
Do not interrupt the mains supply with a time switch or
programmer.
Warning!
This appliance must be wired in accordance with
these instructions. Any fault arising from
incorrect wiring cannot be put right under the
terms of the Vaillant guarantee.
12.1 Mains, external controls and pump connections
(mains voltage)
ecoMAX pro boilers are fitted with a terminal box loca-
ted at the base of the boiler into which all connections
are made.
To gain access to the terminal box remove the two retai-
ning screws indicated in Fig. 12.1 and carefully lower to
reveal the terminal strip inside.
Fig. 12.1
Instructions for Use, Installation and Servicing ecoMAX pro
1

Electrical Connections 12

Disconnect and remove the test cable from the terminal
strip and discard.
Connect both the mains supply and switched live from
the external controls (room thermostat and, if applica-
ble, frost thermostat) into the marked terminals as
shown in Figs. 12.2 and 15.1.
Fig 12.2
Connect the pump supply into the marked pump termi-
nals as shown in Figs.12.2 and 15.1.
(Note: the boiler incorporates a pump overun thermost-
at. Only feed the pump from the marked terminals in the
terminal box on the boiler, not from a separate supply).
Observe all terminal markings and colour codes shown
in Fig. 15.1.
Ensure that all flexible cords are routed through the
strain relief cable glands on the inlet of the terminal box.
Refit the terminal box to the underside of the boiler
using the two retaining screws.
12.2 Electrical connections – testing
Carry out preliminary electrical system checks as below;
1. Test insulation resistance to earth of mains cable.
2. Test the earth continuity and short circuit of cables.
3. Test the polarity of the mains.
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