Electrical - Worcester 29CDi Classic Installation, Commissioning And Servicing Instructions

4.7

ELECTRICAL

CAUTION:
▶ ISOLATE THE MAINS ELECTRICITY SUPPLY
BEFORE STARTING ANY WORK AND OBSERVE ALL
RELEVANT SAFETY PRECAUTIONS
Danger of short circuit: When connecting the cables ensure that no
cable pieces fall inside the control panel.
Mains supply to the boiler must be through a fused
double pole isolator situated next to the appliance. The
isolator must have a contact separation of 3mm
minimum in all poles.
Access to electrical connections:
▶ Remove boiler casing to access control panel.
1. Slide the white plastic clip down to release the control panel and
lower into the service position.
2. Unscrew the three screws (B) on the back of the control panel and
pull off the connections cover.
3. Unclip the cable clamp (C).
4. Cut off the tapered cable entry to fit cable diameter required.
5. Turn cable retaining screw (D) anti-clockwise. Run cable over the
main crossbar and through the cable clamp (C), ensuring there is
ample cable to reach the connectors.
Turn cable clamping screw (D) clockwise to secure cable and replace
clamp (C) into control panel.
6. Mains power 230 V connection (ST10) pre-mounted:
▶ Separate wires from cable end and strip to 6mm
▶ Connect LIVE wire to terminal (L)
▶ Connect NEUTRAL wire to the terminal (N)
▶ Connect EARTH wire to the earth connector (
Earth cable to be longer so that it pulls out last if mains
cable is snagged.
7. Optional external frost thermostat connection (ST6):
▶ Connect frost thermostat supply LIVE to terminal (FS)
▶ Connect frost thermostat SWITCHED LIVE to terminal (FR)
8. 230V room thermostat and/or external timer (ST10):
▶ Remove link
▶ Connect room thermostat LIVE supply to terminal (LS)
▶ Connect room thermostat SWITCHED LIVE return to terminal (LR)
▶ Connect room thermostat NEUTRAL to terminal (NS)
9. Refit control panel cover:
▶ Refit panel and secure with screws (B).
▶ Bring the control panel to its upper position and secure by sliding the
white plastic clip up.
6 720 815 725 (2015/05)
EARTH =
LIVE =
NEUTRAL =
SWITCHED LIVE =
8.
)
ST10
Fig. 42 Electrical connections
1.
C
3. 4.
E
AND
3
6
/OR
L L N N L
R S S
L L N L
R S N
S
ST10
INSTALLATION
B
2.
5.
D
D
6.
230V
E L
N
ST10
L L N N L
R S S
7.
FROST
THERMOSTAT
F F N L
R S P P
ST6
ST19
B
B
4
2
FR FS NP LP
1
A
ST8
F
ST6
Code Plug
29