Glow-worm Xtramax - Manual (Page 22)

22 4000116705-2
12 Electrical Connection
WARNING: This appliance must be earthed and 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.
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.
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 fused at 3A 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 three pin plug fused at 3A 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.
12.1 Mains Cable
The boiler is supplied with a mains lead attached, see diagram
12.1.
Standard colours are Brown - Live, Blue - Neutral, Green and
Yellow - Earth.
Important: If a replacement supply cable is required it must be
purchased. Part No. S1008600.
12.2 External controls
WARNING: UNDER NO CIRCUMSTANCES MUST ANY
MAINS VOLTAGE BE APPLIED TO ANY OF THE TERMINALS
ON THE HEATING CONTROLS CONNECTION PLUG.
To gain access to the external control connections, unclip side
clips and hinge up control panel cover.
The boiler will work for heating without a room thermostat being
connected provided that the wire link fitted between the two
terminals of the connector (E) is left in place, see diagrams
12.2 and 12.3.
Alternatively, a 24V room thermostat can be used but do not
make any connection to the compensating resistor, see diagram
12.2.
ON NO ACCOUNT must any electrical voltage be applied to
any of the terminals of the external controls plug.
12.3 Remote control (F)
For extra control or if the boiler is to be sited in a garage or utility
room an optional remote control unit with programmable roomstat
can be obtained part number A20077, see diagram 2. This is
a dual function unit, (a) boiler control (same as boiler facia), (b)
programmable room stat. Full fitting instructions are supplied
with the unit.
12.4 Electrical Connections - Testing
Checks to ensure electrical safety must be carried out by a
competent person.
After installation of the system, preliminary electrical system
checks as below should be carried out.
1. Test insulation resistance to earth of mains cables.
2. Test earth continuity and short circuit of all cables.
Ins 060
The boiler is supplied with a mains lead attached.
Connect this to the electrical supply.
Diagram 12.1
11751
No room thermostat.
Leave link in place
IMPORTANT
VOLTAGE FREE
room thermostat.
Remove link and connect
to terminals 1 and 2 ONLY,
DO NOT connect to
terminal 3
Leave link in place for no external controls.
F
Diagram 12.3
Note: Connection F is
used when the optional
remote control with room
thermostat Part No.
A20077 is fitted.
E
3. Test the polarity of the mains.
Please ensure the “Benchmark” logbook is completed and left
with the user.
Note: For further information, see the building regulations
1991 - Conservation of Fuel and Power - 1995 edition -
appendix G, Table 4b.
°C
Without room
thermostat
IMPORTANT
With VOLTAGE FREE
room thermostat
E E
10023
Diagram 12.2
Heating controls
connection plug