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INSTALLATION
− that the system be always at a pressure higher than the
atmospheric one at any point (including the pump suc-
tion side) and under any operating conditions (all seals
and hydraulic couplings in a system are designed to
withstand pressure towards the outside, but not under-
pressure);
− the installation be not made with gas-permeable mate-
rials (e.g. plastic pipes without oxygen barrier for under-
floor heating systems)
9
Damages suffered by the thermal module, caused by en-
crustations and corrosion, are not covered by warranty. In
addition, the non compliance of the water requirements
listed in this chapter will void the appliance warranty itself.
2.11 System filling and emptying
The thermal module Steel Pro Power must be provided with a
charging system to be connected to the appliance's return line.
Before filling or emptying the system, switch the system's mas-
ter switch to the OFF position and the thermal module's master
switch to (0).
2.11.1
Filling
− Make sure that drain cocks (1) are closed before you start
loading the system
1
− Unscrew the vent valve's release cap
− Open the shut-off cocks in order to slowly fill the system
− Use the pressure gauge to check that the pressure is rising
and the water is exiting through the vent valves
− Close the shut-off cocks after the pressure reaches 1.5 bar
− Start the system pumps and the thermal module's pump
as shown in Paragraph "Commissioning and mainte-
nance"
− During this stage, check that the air is correctly eliminat-
ed
− Restore the pressure if necessary
− Switch the pumps off and on again
− Repeat the last three steps until the pressure is stabilised
9
The system must be filled up slowly the first time; once it is
filled and the air expelled it should never need to be topped
up again.
9
Systems should also be operated at maximum working
temperature the first time they are started up, in order to
facilitate de-aeration. (Gas is not released from the water at
low temperatures).
9
An automatic spurge can be performed during the first igni-
tion. The parameter that set the cycle is Par. 139. See param-
eter table for more information.
2.11.2
Emptying
Before starting to empty the appliance and the storage cylinder:
− Switch the system's master switch to the OFF position and
the thermal module's master switch to (0).
− Close the water supply shut-off cocks;
− To empty the appliance, connect a rubber hose (2) (Øint
internal diameter = 12mm) to the drainage hose connec-
tor of each unit (1).
1
2
42
2.12 Wiring diagram
Version with pump
1
2
3
4
5
6
7
8 9 10
11 12 13 14
15 16 17 18
19 20 21 22
1
2
3 4
5
6
7
8
9 10
11 12 13 14
15 16 17 18
19 20 21 22
MO1
1
2
3
4
5
6
7
8
9
10
11 12 13 14
15 16 17 18
19 20 21 22
b
h
b
h
b
h
b
h
b
h
b
h
b
h
b
h
b
h
b
h
b
SR
J6-3
b
J6-10
h
J6-12
h
SF
J6-5
b
J7-2
h
Pm
J7-4
b
J7-6
b
FL
J7-7
bl
J7-8
h
J12-1
r
TS
J12-4 w
J12-5
h
SM
J12-2
b
J8 J11 J12
J7
J15
J6
J9
J5
J4
J3
J1
J2
F1
VG1
EA
VE1
PC
AE
MO2
101 102 103 104 105 106 107 108 109 110 111 112
IM1
101 102 103 104 105 106 107 108 109 110 111 112
L
N
L
N
L
L
N
L
N
101 102 103 104 105 106 107 108 109 110 111 112
Key
EA
MO1
Low-voltage terminal board
AE
MO2
High-voltage terminal board
TSC
M1D2
Low-voltage terminal board Dep2
SCH
M2D2
High-voltage terminal board Dep2
VG1
SR
Return probe
PC
SF
Exhaust flue probe
IM1
Pm
Minimum pressure switch
IM2
FL
Flow-meter
VE1
TS
Safety thermostat
SM
Flow probe
23 24 25 26 27 28
SCH
23 24 25 26 27 28
M1D2
23 24 25 26 27 28
h
h
b
h
b
bl
b
h
b
h
b
h
h
b
bl
J6-3
b
SR
J6-10
h
J6-12
h
SF
J6-5
b
J7-6
b
FL
J7-7
bl
J7-8
h
J12-1
r
TS
J12-4 w
J12-5
h
SM
b
J12-2
J8 J11 J12
J7
J15
J6
J5
J4
J3
F1
VG1
EA
VE1
PC
AE
g
M2D2
113 114 115 116 117 118
113 114 115 116 117 118
CLOSE
OPEN
L
N
L
N
L
113 114 115 116 117 118
Ignition/detection electrode
Cable colour
Power supply
b
Auxiliary display connection
h
Display and control card
r
Gas valve 1
w
Pump
bl
Module switch 1
g
Module switch 2
y
Fan
gr
43
INSTALLATION
h
b
TSC
bl
J9
J1
J2
g
IM2
brown
blue
red
white
black
yellow/green
yellow
green
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