27
0020008153A
Warning. This boiler must be earthed.
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 Glow-worm guarantee.
All system components must be of an approved type.
Electrical components have been tested to meet the equivalent
requirements of the BEAB.
Connection of the whole electrical system and any heating
system controls to the 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 readily 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.
The mains electrical supply must be maintained at all times in
order to provide domestic hot water.
Do not interrupt the mains supply with a time switch or
programmer.
9.1 External controls (Mains Voltage)
Important: If a replacement supply cable is required it must be
purchased. Part No. S1008600.
Ensure that a seperate external controls cable and pump supply
cable are fed to the boiler.
Refer to wiring diagram in section 12.
All hxi boilers are fitted with a connection box located at the base
of the boiler into which all connections are made.
To gain access to the connection box remove the two retaining
screws indicated in Diagram 9.1 and carefully lower and pull
forward the box to reveal the terminal strip inside.
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 applicable, frost
thermostat) into the marked terminals as shown in diagrams 9.2
and 9.3.
If a room thermostat is not fitted, then the connecting link must
be fitted between terminals 1 and 2, see diagram 12.2.
Connect the pump supply into the marked pump terminals as
shown in diagram 9.2.
Observe all terminal markings and colour codes as shown in
diagram 12.2.
NOTE: The boiler incorporates a pump overun thermostat. Only
feed the pump from the marked terminals in the connection box
on the boiler, not from a separate supply.
Ensure that all flexible cords are routed through the strain relief
cable glands on the inlet of the connection box.
Refit the connection box to the underside of the boiler using the
two retaining screws.
9 Electrical Connections
Diagram 9.1
11831
CONNECTION
BOX
RETAINING
SCREWS (2)
Diagram 9.2
11833
9.2 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.
MAINS LIVE
ROOM STAT
FROST STAT
NEUTRAL
PUMP
NEUTRAL
PUMP LIVE
MAINS LIVE
ROOM STAT
FROST STAT
NEUTRAL
PUMP
NEUTRAL
PUMP LIVE
MAINS INLET
TO BOILER
1
2
34
5
6
7
8
TERMINAL
1
2
3
4
5
6
7
8
MAINS INLET CONNECTIONS
MAINS (L) 230V ~ 6A RATED CABLE (0.75mm
2
)
SWITCHED LIVE (L) 230V ~
FROST STAT (L) 230V ~
MAINS NEUTRAL (N) 230V ~ 6A RATED CABLE (0.75mm
2
)
MAINS EARTH (GND 0V) 6A RATED CABLE (0.75mm
2
)
PUMP EARTH (GND 0V) 6A RATED (0.75mm
2
)
PUMP NEUTRAL (N) 230V ~ 6A RATED (0.75mm
2
)
PUMP LIVE (L) 230V ~ 6A RATED (0.75mm
2
)
CABLE CONNECTIONS
MAINS
SUPPLY
CABLE
PUMP
SUPPLY
CABLE
If there are no external
controls to connections
2 or 3 then a "link"
between connections
1 and 2 must be fitted,
this will make the boiler
run continuously.
TERMINAL
CONNECTIONS
1 TO 8.
REFER TO TABLE
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