SP
SZ
BC
MOD. BTN E V and BTFS E V
SP: MAIN PCB
SZ: ZONE PCB
IG: TWO-POLED MAIN POWER SWITCH
BC: FLAME DETECTION PCB
VG: GAS VALVE
V: FAN
PV: FAN PRESSURE SWITCH
E.RIV: FLAME DETECTION ELECTRODE
E.ACC: IGNITION ELECTRODE
PSB: RESET BUTTON
TS: SAFETY THERMOSTAT
TF: FLUE GAS THERMOSTAT
DK: LOW WATER PRESSURE SAFETY SWITCH
FL: FLOW METER
PR: RECIRCULATION PUMP
PS: DHW PUMP
EV: TWO-WAY WATER TANK INTERCEPTING VALVE
MVD: THREE-WAY MOTORIZED VALVE
VM: CIRCUIT 2 MOTIRIZED MIXING VALVE
PR1: CIRCUIT 1 CH PUMP (HIGH TEMPERATURE)
PR2: CIRCUIT 1 CH PUMP (LOW TEMPERATURE)
M: TERMINAL BOARD FOR CONNECTION TO EXTERNAL TEMPERATURE PROBE,
THERMOSTATS
SE: 10K Ohm B=3977 EXTERNAL TEMPERATURE PROBE
TA1: ZONE 1 THERMOSTAT (HIGH TEMPERATURE) (OPTIONAL EQUIPMENT)
TA2: ZONE 2 THERMOSTAT (LOW TEMPERATURE) (OPTIONAL EQUIPMENT)
TSM: LOW TEMPERATURE SAFETY THERMOSTAT (OPTIONAL EQUIPMENT)
M6: TELEMETRY CONNECTION
M1-M24: AVAILABLE CONNECTORS
X1-X8: AVAILABLE CONNECTORS
CT: PHONE CONNECTION DEVICE (OPTIONAL EQUIPMENT)
FUSE (SP): 2 AF 250 Vac FUSE
FUSE (SZ): 2.5 AF 250 Vac FUSE
P4: HIGH TEMPERATURE CH CURVES ADJUSTING POTENTIOMETER
R4: LOW TEMPERATURE CH CURVES ADJUSTING POTENTIOMETER
P3: BOILER OPERATING MODE SELECTOR
P2: DHW TEMPERATURE ADJUSTING POTENTIOMETER
P1: CH TEMPERATURE ADJUSTING POTENTIOMETER
TIMER: TWO-CHANNEL TIMER (CHANNEL 1 CH - CHANNEL 2 = DHW)
SB: 10k Ohm b=3435 WATER TANK PROBE
SR: 10k Ohm b=3435 CH PROBE
SS: 10k Ohm b=3435 DHW PROBE
SM: LOW TEMPERATURE ZONE PROBE ON FLOW 10k Ohm b=3435
T (°C)
0
2
4
6
8
0
27203
24979
22959
21122
19451
10
17928
16539
15271
14113
13054
20
12084
11196
10382
9634
8948
30
8317
7736
7202
6709
6254
40
5835
5448
5090
4758
4452
50
4168
3904
3660
3433
3222
60
3026
2844
2674
2516
2369
70
2232
2104
1984
1872
1767
80
1670
1578
1492
1412
1336
90
1266
1199
1137
1079
1023
Relation between temperature (°C) and nominal resistance (Ohm) of CH probe (SR), DHW probe (SS), water tank probe (SB) and low temperature zone probe on flow (SM).
pic. 10
20
