33
m
CAUTION
It is compulsory:
– to use an omnipolar cut-off switch, disconnect
switch, in compliance with EN standards (contact
opening of at least 3 mm)
– if the power cable is to be replaced, that ONLY a
special cable is used with a factory produced re-
wired connector, ordered as a spare part and con-
nected by a professionally qualified person
– to connect the earth wire to an effective earthing
system (*)
– that before any work is done on the boiler, the mains
power is disconnected by setting the main system
switch to "OFF".
(*) Sime Ltd declines all responsible for any injury or damage
to persons, animals,or property as a result of failure to pro-
vide adequate earthing of the appliance.
d
DO NOT
Do not use water pipes for earthing the appliance.
6.13.1 External sensor
The boiler is designed for connection to an external temper-
ature sensor code 8094101, which will automatically regulate
the central heating delivery temperature.
This means that the delivery temperature of the boiler can vary
on the basis of the external temperature depending on the cli-
matic curve selected from those shown in the diagram (Fig. 29).
When fitting the sensor on the outside of the building, follow
the instructions provided on the packaging of the product itself.
Climatic curve
Delivery temperature
20
15
10
5
0
-10
-15
-5
-20
80
90
70
60
50
40
30
20
°C
°C
K=9
K=7
K=8
K=5
K=6
K=3
K=4
K=2
K=1
External temperature
Fig. 29
m
CAUTION
If there is an external sensor, the heating delivery
SET is corrected using correction factor K in order to
adapt better to the user's needs. To modify this value,
carry out the same procedure as when modifying the
heating SET but with the possible range between 0.0
and 9.0.
6.13.2 External timers and Room Thermostats
The heat demand can be by a "clean contact" conforming to
EN607301 connected to TA (see section
"Wiring diagram"
) or by
use of a dedicated Sime Remote Control (Home or Home Plus).
The boiler will automatically detect when a dedicated control
is connected.
6.13.3 EXAMPLE of use of the command/control de-
vice on some types of heating systems
KEY
M
System flow
R
System return
CR
Remote control
SE
External sensor
TA
Room thermostat for boiler activation
TZ1÷TZ3 Room thermostat for the zone
VZ1-VZ3 Zone valves
RL1-RL3 Zone relays
P1-P3 Zone pump
TSB
Low temperature safety thermostat
ONE DIRECT ZONE system, external sensor and room ther-
mostat.
R
M
SE
TA
CR
Fig. 30
MULTI ZONE system - with zone valve, room thermostat and
external sensor.
TA
TZ1
VZ1
VZ2
VZ3
TZ2
TZ3
SE
R
M
Fig. 31
m
CAUTION
Set the parameter "tS 1.7 = DELAY SYSTEM PUMP
ACTIVATION to allow the opening of zone valve VZ.
