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Figure 15 Mital Plus Internal Wiring Diagram
AE
CR
E1
E2
E3
EA
ER
F
F1
FT
H
H2
IG
Control Box
Rectifier (SIT Only)
Gas Safety Solenoid
Gas Solenoid Modulation
Main Gas Solenoid
Ignition Electrode
Flame Detection Probe
Fuse
Fuse
Electrical Filter
High Limit Thermostat
N/A
Boiler On / Off Switch
M1, 2 & 3
MN
MO
MR
MV
MX
OP
PB
PC
PF
PW
R
S1
Hot Water Priority Switch
N/A
Permanent Live for Time Clock
Terminal Strip
Fan Motor
N/A
Heating Timer Connections
Lock-Out Reset Button
Pump
Air Pressure Switch
Water Pressure Switch
N/A
Hot Water Control Thermostat Stage 2
S2
SA
SB
SF
SL
SW
T1
T2
TA
TIS
VZ
Hot Water Control Thermostat Stage 1
Low Water Pressure Warning Light
Lock-Out Warning Light
Flue Warning Light
Power On indication
Summer / Winter Switch
Boiler Control Thermostat Stage 2
Boiler Control Thermostat Stage 1
Room Thermostat (Optional)
Transformer
N/A