Green Heating Technology
15
SERVICE
M
anual
City Class F-FR
Electrical diagram FR
1 Flue pressure switch (*)
4 Flame ignition/detection electrode
5 Safety thermostat on system flow (*)
6 Temperature Sensor, system flow
7 Motorized 3-way valve
10 Pump
12 Loss of water pressure switch (*)
13.1 Gas valve - modulation control
13.2 Gas valve - opening control
19 Fan
41 Fuse F2A (2A fast)
42 Resistor, 2.2 FOhm - 1/2W (**)
(*) the contacts of these components are shown in
“standard” conditions (i.e. temperature below
threshold, cold system, no system pressure, no
flow)
(**) see “Electrical connection between the boiler and
the storage unit”for details.
Optional external devices:
SP DHW Storage temperature Probe (**)
ST DHW Storage Thermostat (*) (**)
TA Room thermostat: (or Chronothermostat) SELV
simple contact. Closed contact = heating request.
or Remote control (original accessory only)
SE To optional outdoor temperature sensor
Abbreviations: COM Common • NC Normally
closed (contact) • NO Normally open (contact)
• HEA Heating (diverting command) • DHW Hot
water (diverting command)
Colours: BF BlacF • BN Brown • BU Blue
• GN Green • RD Red • OG Orange
• VT Violet • WH White • YE Yellow
• YG Yellow-Green
FR
1 2
4
3
PE
N
L
M0101
M0102
M0901
M0900
M0904
NC
NO
NC
NO
3
4
2
1
YG
BN
BU
3 DH
W
2 CO
M
1 HE
A
WH
BK BK
RD
BU BU
BK
BK OG
OG
VT
VT
GN
GN
BU
BU
WH
WH
BU
BU
WH
WH
RD
BN
YG
BU
BN BU
BU BN
BK
41
7
1
6
5
12
13.2
13.1
10
19
003383 01
L N
SE
TA
4
SP
ST
42
(SP)
(ST)