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ELEcTrIcAL WIrING
6.0
6.2 EXTErNAL cONTrOLS AND MAINS SuPPLY
a)
The Gledhill GB35C combination boiler is fitted with the wiring terminals
inside the control panel as shown in figures 6.1 and 6.. The access to these
terminals is gained as follows: -
•
Remove the front cover by removing the two screws at the bottom (front)
and then lifting it off the two lugs on the top.
•
Open the hinged control panel by first unscrewing the retaining screw
(top left hand side).
•
Remove the plastic cover by first unscrewing the retaining screws.
b) Observe all terminal markings and colour codes as shown in figure 6.
and table 6.1. Ensure that all flexible cables are routed through the strain
relief cable clamp (at the bottom) and the entry holes in the control panel
as shown in figure 6.1. Also ensure that the there is enough slack in the
cable between the strain relief clamp and the wiring terminals so that the
control panel can swing through 180o without straining i.e. pulling on the
cables.
c)
The controller in this boiler is phase sensitive. Therefore if mains supply
'Live' and 'neutral' are reversed, then the controller will not function and
an error message will be displayed.
d) A permanent 30V ac, 50Hz supply via a double pole isolator must be
connected to terminals 'L' , 'N' and 'E' as shown in figure 6..
e)
The boiler is supplied with an electro-mechanical central heating
programmer fitted. However a room thermostat must be connected to
the boiler terminals for central heating to function. Any external controls
must meet the relevant requirements of Building Regulations Parts L1A
and L1B (see also section 4. (d)).
f )
Carry out the preliminary electrical checks below after wiring and before
switching on the supply: -
•
The insulation resistance to earth of mains cables.
•
Test the earth continuity and short circuit of cables
•
Test the polarity of mains.
Terminal
1 - L
- N
3 - E
4 - E
5 - N
6 - SL
Switched Live (SL) supply to room thermostat - 30V ~ 6A rated cable (0.75mm
7 - L1
Table 6.1 Description of Boiler Wiring Terminals
Mains (L) supply - 30V ~ 6A rated cable (0.75mm
Mains (N) supply - 30V ~ 6A rated cable (0.75mm
Mains (GND, E) supply - 0V ~ 6A rated cable (0.75mm
(GND, E) supply to room thermostat - 0V ~ 6A rated cable (0.75mm
Neutral (N) supply to room thermostat - 30V ~ 6A rated cable (0.75mm
Live (L) supply to room thermostat - 30V ~ 6A rated cable (0.75mm
Permanent
mains supply
from double
pole isolator
30VAC, 50Hz
fused at 5A
Description
Page 6
Figure 6.2 - Permanent Mains Supply
and room Thermostat Wiring
1
2
3
4
5
6
L
N
E
E
N
SL
E
N SL L1
Room Thermostat
)
)
)
)
)
)
)
7
L1
3 Core Flex
4 Core Flex
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