33
ASSEMBLY DIAGRAM XILO T 20 N MS W TOP - card code 4.56035.0
LEGEND
BM Modulating
coil
CiR Heating
circulator
EA Ignition
electrode
EC Control
electrode
F Fuse
2(A)
JP1 Methane/LPG
selector
JP3 Post-circulation
selector
JP4 Ignition
limiting
selector
JP5
Jumper to be cut for low temperature
JP6 Mono-thermal/bi-thermal
switch
L
Phase 230 V 50 Hz
N Neutral
PA
Air pressure switch
PS No-water
pressure
switch
RLA Slow ignition power adjustment
Rmax. Heating max. power adjustment
SR Heating
sensor
TA
Room thermostat (if any)
TL
Limit thermostat (if any)
TST Safety
thermostat
VG
Gas valve SIT 837
VG1 Gas
valve
Honeywell
VK
4105M
VN Fan
1 Heating
potentiometer
2 Selector: Off
Winter
Reset
Test
3 Fixed
knob
L
N
J1
F
J14
L1
T A
TL (BASSA TEMP.)
J6
JUMPER TO BE CUT
IF LIMIT THERMOSTAT
IS REQUIRED
J13
J9
J8
BM
JP4
JP2
JP3
RLA
R max.
SR
PS
PANEL
CONNECTION
JP5
JP1
PA
CiR
J3
VG1
VG
J12
TST
EA
EC
J15
Lock-out warning light
ON/OFF warning light Malfunction warning light
2
1
3
J4
VN
MODULATOR
Resist.
1 kohm
J10
MP
+ S
Warning: One of the two gas valves only, VG or VG1, is fi tted on the boiler.
