37
MULTI ZONE system - with zone valve, air thermostat and
external sensor.
TA
TZ1
VZ1
VZ2
VZ3
TZ2
TZ3
SE
R
M
Fig. 38
m
CAUTION
Set the parameter "tS 17 = DELAY SYSTEM PUMP
ACTIVATION to allow the opening of zone valve Vz.
6.14 Refilling or emptying
Before carrying out the operations described below, make
sure that the main system switch is set to "ON" in order for
the display to show the pressure level in the system during
refilling.
Make sure that the operating mode is set to "Stand-by";
if this is
not the case, press the button
y
for at least 1 second until
this mode has been selected.
6.14.1 Method of filling a sealed system
A sealed system must only be filled by a competent person
using a method similar to that shown in figure below.
Stop
valve
Stop
valve
Test cock
Hose
unions
Double chech
valve assembly
Filling loop
temporarily connected
Mains
water supply
Heating
cicuit return
Fig. 39
6.14.2 REFILL operations
Remove the front panel:
– remove the two screws (1), pull the front panel (2) forwards
and release it from the top by lifting it.
1
2
Fig. 40
Domestic hot water circuit:
– open the domestic hot water circuit isolation valve (4)
– open one or more than one hot water valve to fill and bleed
the domestic hot water circuit.
Heating circuit:
– open the isolation and air bleeding valves in the highest
points of the system
– loosen the automatic bleed valve (3)
– open the heating circuit isolation valves (8) and (9)
– activate the filling system "Method of filling a sealed sys-
tem", and fill the heating system until a pressure of
1-1.2 bar
is shown on the display
– stop the filling system
– check that there is no air in the system by bleeding all the
radiators and the circuit on the high points of the system.
Connect a suitable pipe and use the heat exchanger bleed
point (10) to vent the primary heat exchanger
8
5
4
9
3
Fig. 41
NOTE:
to completely remove all air from the system, it is rec-
ommended that this operation is repeated a number of times.
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