User manual

Page 25
INSTALLATION INSTRUCTIONS FOR THE ELECTRICIAN
Connecting to the mains power supply
 The electrical connections to the S-CB are made via discreet plugs and sockets which are located within the
boiler casing, on top of the control panel.
 Connections must only be made using appropriate diameter multi strand flexible cables. Cable entry must only
be via the rubber gland cable points with the rubber glands located at the bottom of the appliance.
 If the boiler is to be room sealed, then care must be taken to ensure the cable entries are reasonably air-tight.
19.2 Boiler Plug & Connector Strip
The stated items may be attached using the available plugs/sockets where fitted (use relays for pumps)
Please pay attention to the Earth terminal numbers 26,30,33
Remote indication requires supply input, by others
WPS = External water pressure sensor
N.O. = Normally open contact
temp = Temperature
Important: Interruption of the mains supply for On/Off Control must not be used. Safety devices (volt
free ) such as low & high water pressure switches can be series connected in the control circuit 13 & 14
but not when using 0 to 10 volt control
NOTE :Terminals 13 & 14 are for volt free control and safety devices such as low & high water
pressure. Not used with 0 to 10 volt control When using 0 to 10 volt control 0 volts stops the boiler
therefore safety devices should signal 0 volts.
Heating curve
When an outside temperature sensor has been connected, the boiler will respond to the program of weather
compensation (but not when 0 to 10 volt control is used). SEE ELECTRICAL AND CONTROL MANUAL
When the outside temperature sensor is connected, the cable terminals “13” and “14” should be bridged, or an On/Off
control should be used. But not on 0 to 10 volt control For RC and E-BUS see separate data.
O to 10
V dc in
External
On/off