CIRCUIT DIAGRAM
+ -
LEGEND
BM
Modulating coil
CA
Ignition control unit Honeywell
CR
Remote control - room thermostat
CiR
Circulating pump
EC
Control electrode
ES
Spark electrode
KA
Anti-freeze thermostat (on request)
L
Line
MAX R Max. heating setting
N
Neutral
PF
Fumes pressure switch
Pma Lack of water pressure switch
PR
Reset push-button
P.risc. Heating potentiometer
PS
Hot water pressure switch
P.san. Hot water potentiometer
RA
Anti-freeze element
RF
Anti-interference resistance
SB
Lock-out warning light
SC
Connection card
SR
Heating detector
SRT
RX-TX board
SS
Hot water/water-heater detector
SW1 Function selector
TIMER Boiler timer adjustment
TR1
Transformer
TST
Total safety thermostat
V
3-way valve
VG
Gas valve
VN
Fan
NOTE: Check that the
microswitches on selector
SW1 are as illustrated in the
diagram.
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