6 720 611 137 GB (03.02)
22
Electrical connections
4.2
Wiring to your system
Mains electrical supply: The boiler should be connected
to the permanent mains supply as described in
section 4.1. This also provides the electrical supply to
the system.
Note: This must be the only electrical supply to
the system. This ensures the safety of a single
fused supply.
The boiler can only be wired to a remote system junc-
tion box.
Note: A pump is not built into the boiler and must be fit-
ted externally.
The diagram shows the overall wiring details. A factory
fitted cable is fitted between the boiler control panel
and the Y-S-module. This module is designed to pro-
vide the correct voltage interface.
The other connector in the module must be used for
wiring to the remote junction box as shown. It is the
responsibility of the installer to connect all other system
components i.e water valve/s, pump, programmer etc.
to the proprietary junction box according to the instruc-
tions supplied with the box. Worcester Heat Systems
cannot be held responsible for any incorrect wiring to
these parts of the system.
If a room thermostat and/or frost thermostat is required,
these must also be connected to the junction box
according to the proprietary instructions.
Upon completion of the electrical connections check
for earth continuity, correct polarisation and resistance
to earth.
Note:
Fig. 31
Y-S-Module
Remote Junction Box
LS
L
NS
N
PE
E (Earth)
DV
Demand (Switched live)
Table 10
6 720 611 137-10.1O
L
N N
S
L
S
L
R
T
imer
T
ank Stat
Room Stat
Frost Stat
System W
a
ter V
a
lve
Terminal
Strip
This must be
the only electrical
supply to the
Junction Box
OUTSIDE OF BOILER
INSIDE OF BOILER
CONTROL BOARD
HEATRONIC CONNECTOR
PRE-WIRED
INSTALLATION
REMOTE PRE-WIRED
JUNCTION BOX
Other connections to
Terminal Strip according
to Proprietary instructions
Y-S-Module
MAINS 230V
LIVE SUPPLY
TO BOILER AND SYSTEM
PUMP
LRLS NS PE PE DV LS NS
E
N
L
BOILER/PUMP
DEMAND
MAINS SUPPLY
WIRING
