Horstmann H37XL User Manual page 2

ELECTRICAL CONNECTIONS
ChannelPlus programmers are double insulated and do not require an Earth connection but an Earth
terminal is provided on the Backplate for terminating any cable Earth conductors.
Earth continuity must be maintained and all bare Earth conductors must be sleeved. Ensure that no
conductors are left protruding outside the central space enclosed by the Backplate.
INTERNAL WIRING DIAGRAM H37XL
NEW INSTALLATIONS
An Example circuit diagram is shown below. This diagrams is schematic and should be used as a guide
only.
Please ensure that all installations comply with the current IEE regulations.
For reasons of space and clarity the diagrams have been simplified, for instance some Earth
connections have been omitted.
Other control components shown in the diagrams i.e. Valves, RoomStats etc are general
representations only. However the wiring detail can be applied to the corresponding models of most
manufactures e.g. Horstmann, Honeywell, Danfoss Randall, ACL Drayton etc.
Cylinder and Room Thermostat Key:
C = Common CALL = Call for heat or break on rise
NOTE: If the ChannelPlus H37XL is being installed on an existing system additional equipment such as
an extra zone valve may have to be fitted in order to achieve full three channel control.
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SAT = Satisfied on rise N = Neutral
ChannelPlus H37XL
Controlling 3 x two port
spring return zone
valves via RoomStat and
CylinderStat
giving independent
control of Hot water and
two zones of Heating
COMMISSIONING THE PROGRAMMER
Ensure all dust and debris has been cleared away from the work area before removing the
programmer from its packaging.
All ChannelPlus XL controls are fitted with battery reserve which maintains programmed times in the
event of a mains power failure.
The battery must be switched on prior to fitting the control to the wiring plate.
This is achieved by means of a COMMISSIONING SWITCH situated on the back of the unit.
(See below)
REAR VIEW OF CHANNELPLUS XL PROGRAMMER
COMMISSIONING SWITCH
When the programmer is supplied the commissioning switch is in the OFF position. Using a suitably sized
screwdriver or similar, move the switch to either the PUMPED or GRAVITY position.
Moving the switch from the OFF position only activates the programmer's BATTERY RESERVE. When the
programmer is running on BATTERY RESERVE the clock display will remain blank.
(NOTE: The GRAVITY position on the ChannelPLus H37XL will only commission the Battery, the
programmer will not automatically provide a supply of Hot water during Central heating programmed
times. Therefore Hot water time settings will have to be programmed to cover any Central heating
requirements.)
FITTING THE PROGRAMMER
If surface wiring has been used, remove the knockout/insert from
the bottom of the programmer to accommodate it.
Loosen the two 'captive' retaining screws on the top of the unit.
Now fit the programmer to the Backplate, line the lugs on the
programmer with the flanges on the Backplate.
Swing the top of the programmer into position ensuring that the
connection blades on the back of the unit locate into the terminal
slots in the backplate.
Tighten the two 'captive' retaining screws to fix the unit securely,
then switch on the mains supply.
1 - RETAINING SCREWS
2 - COMMISSIONING SWITCH
3 - CONNECTOR BLADES
4 - PRODUCTION DATE LABEL
5 - POSITIONING LUGS
6 - RATINGS LABEL
END VIEW OF CHANNELPLUS PROGRAMMER
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