Zanussi ULTRA COMBI 35 Installation And Servicing page 31

26 INTERNAL WIRING
This boiler comes pre-fitted with 1.8m of mains cable. This
must be connected to a permanent live supply and NOT
switched by thermostats/programmers. If the supply cord is
damaged, it must be replaced by the manufacturer, service
agent or similarly qualified persons in order to avoid hazard.
This 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.
To add thermostat/programmer:
1. Isolate the mains supply to the boiler.
2. Remove the front panel. Refer to Frame 37.
3. Swing the control box down into the servicing position.
Refer to Frame 30.
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.
5. Connect wires to terminal block, see instructions below.
6. Swing the control box back up into the operating
condition and re-fit the front panel ensuring a good seal
is made.
Kits available:
(see individual kits for installation instructions)
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.
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.
RF Mechanical Programmable Room Thermostat
(24 hr) kit - Combined 24 hour mechanical timer
and room thermostat with wireless communication to
receiver unit which fits into control box of the boiler.
RF Electronic Programmable Room Thermostat
(7 day) kit - Combined 7 day timer and room
thermostat with wireless communication to receiver
unit which fits into control box of the boiler. Features
English language installation help messages. Also
OpenTherm Control for gas consumption saving.
RF Mechanical Timer and Room Stat Kit - Combined
mechanical timer and RF receiver. This kit fits into
the control box of the boiler. The digital RF Room
thermostat can be wall mounted or free standing.
OpenTherm Harness Kit for hardwired Programmable
Room Thermostat.
Outside Sensor Kit the boiler flow temperature is set
from the outside temperature.
Installation and Servicing
INSTALLATION
ROOM THERMOSTAT (NO TIMER) - WIRING
1. Remove link wire between Room stat/timer terminals.
2. Connect room stat across terminals as shown in diagram A -
see Frame 27.
3. If room stat has a neutral connection, connect this to terminal
N (load) in the fused spur.
ROOM THERMOSTAT + TIMER - WIRING
1. Remove link wire between Room stat/timer terminals.
2. Connect room stat and programmer in series as shown in
diagram B - see Frame 27.
3. If room stat has a neutral connection, connect this to terminal
N (load) in the fused spur.
FROST THERMOSTAT - WIRING
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.
1. Position the frost thermostat in a suitable position, i.e. area
vulnerable to freezing.
2. Connect frost stat across terminals marked frost stat as
shown in diagrams A and B - see Frame 27.
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