21
Sales/Spares & Replacement Help Line 01604 762881
12. ELECTRICAL
WARNING: This appliance must be earthed.
12.1
DROP DOWN CONTROL PANEL
:
See paragraph 17.5.
12.2
ELECTRICAL CONNECTIONS
12.2.1
A mains supply of 230Vac ~ 50 Hz is required.
12.2.2
The fuse rating should be 3A. All external controls and wiring must be suitable for mains voltage.
12.2.3
Wiring external to the boiler MUST be in accordance with the current I.E.E. (BS 7671) Wiring Regulations
and any local regulations.
12.2.4
Wiring should be 3 core PVC insulated cable, not less than 0.75mm
2
(24 x 0.2mm), and to BS 6500. For
IE reference should be made to the current ETCI rules for electrical installations.
12.2.5 Connection must be made in a way that allows complete isolation of the electrical supply such as a
double pole switch having a 3mm (
1
/
8
”) contact separation in both poles. The means of isolation must be
accessible to the user after installation.
12.3
INTERNAL WIRING
12.3.1
The boiler comes pre-fitted with 1.8m of mains cable.
12.3.2
This must be connected to a permanent live supply and NOT switched by
thermostats/programmers.
12.3.3
The boiler comes pre-fitted with a link wire between the room thermostat/
Timer connections on the terminal strip. This creates a permanent call for
heat and must be removed when adding a room thermostat/programmer.
12.4
TO ADD THERMOSTAT/PROGRAMMER
12.4.1 Isolate the mains supply to the boiler.
12.4.2 Remove the front panel. See paragraph 17.5.
12.4.3 Swing the control box down into the servicing position. See Figure 31.
12.4.4 Route incoming cables through the grommets in bottom panel (note,
grommets are ‘blind’ and will require puncturing) and secure using clamps
and screws provided in hardware pack.
12.4.5 Connect wires to terminal block.
12.4.6 Swing the control box back up into the operating condition and re-fit the front panel ensuring a good seal
is made.
12.5
THERMOSTATS & TIMER KITS
:
Telephone Johnson & Starley on 01604 762881 for details.
12.5.1
MECHANICAL TIMER (24 HR) KIT:
24 hour mechanical CH timer fits into the control box of the boiler.
This can be fitted in conjunction with a room thermostat.
12.5.2
ELECTRONIC TIMER (7 DAY) KIT:
7 day electronic CH timer fits into the control box of the boiler.
This can be fitted in conjunction with a room thermostat. Features English language installation help
messages.
12.5.3
ROOM THERMOSTAT (NO TIMER)
a. Remove link wire between room stat/timer terminals.
b. Connect room stat across terminals as shown in diagram. See Figure 22.
12.5.4
ROOM THERMOSTAT with TIMER
a. Remove link wire between room stat/timer terminals.
b. Connect room stat and programmer in series as shown in diagram. See Figure 22.
12.5.5
FROST THERMOSTAT
If parts of the system are vulnerable to freezing or the programmer is likely to be left off during cold
weather, a frost stat should be fitted in conjunction with a pipe thermostat.
a. Position the frost thermostat in a suitable position, i.e. area vulnerable to freezing.
b. Connect frost stat in series with room stat as shown in diagram. See Figure 22.
12.6
OPTIONAL SYSTEM CONTROL
Open therm protocol controls are available for outside temperature compensation and room temperature sensing
and can be used to improve the heating system control. They must be connected to the correct terminals as
described in their own instructions. A room thermostat MUST NOT be used with these controls.
12.7
ELECTRICAL TESTING
Carry out electrical checks:
•
Earth continuity and short circuit of cables
•
Polarity of the mains supply
•
Insulation resistance to earth
FIGURE 21.
ELECTRICAL CONNECTIONS
