25
xtra
-
Installation & Servicing
INSTALLATION
Alternatives
: The Ideal programmable room thermostat and outside sensor kit provides enhanced user comfort. Full
instructions provided with kits.
Parameter modifications see Frames 35 to 39.
Parameter 46 = 03 If a live output is required for positioning of
the valve to satisfy CH demand.
Parameter 46 = 23 If a live output is required for positioning of
the valve to satisfy DHW demand.
This system provides heating to one zone at a time with DHW
priority controlled by parameter 43. To heat more than one
zone simultaneously, use zone thermostats to energise
individual zone valves with all calls for heat applied to 'CH
CALL'. The boiler will be limited to responding with a set flow
temperature set by parameter 4 (see Frame 31).
If all zones are fitted with individual zone valves a hydraulic
bypass will be required to allow pump overrun. See page 6
and 10 for details.
im8193
Motorised valve
Pump
Cylinder
thermostat
Programmer
Room
stat
28 MAINS VOLTAGE CH AND DHW CONTROLS WITH DHW VALVE OUTPUT
* The switched live from external controls must be from the same phase supply as the boiler
mains supply to ensure that when the boiler supply is switched off the controls are also isolated.
230 VAC
Permanent
mains supply
If pump requires more
than 1 amp supply current,
connection must be made
via a relay
Motorised
Valve
(Not Mid-position)
Room
stat
Cyl
stat
DHW
CH
External 230 VAC
Programmer *
CH
CALL
DHW PUMP OR VALVE
M V
D H W
N
L
N
L
CH PUMP
N
L
MAINS IN
N
L
DHW
CALL
230 VAC
Permanent
mains supply
MAINS IN
N
L
im8487
SLAVE MODULE
MASTER MODULE
INST
ALLA
TION
