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ELECTRICAL CONNECTIONS
PNZ burners are designed to work with three-phase supply (230-400 V/50 Hz). Provide a three-phase main switch prior to
connecting the burner to the mains. Provide a second main switch for the pre-heater resistances (see fig. 9). The necessary
connections are to the supply line, the thermostat line, the boiler and the environment, and eventually the safety light of the
room thermostat. Connect the resistances of the pre-heater tank as well. The motors of the burners and the resistances
of the tank are designed to work at 400 three-phase (i.e. with a star connection); when line voltage is 230 V a triangle
connection is needed. Simply change the position of the clamps on the terminal board of the motor and the resistances,
without changing any other connection (see figures 6-7).
BRM
F
IG
RT
CT
1 2 3 4 5 6 7 N
SQN 30.121A3500
L1
L1 L2 L3 N
N 1
2
3
4
5
6
7
8
9 10
N N
L2 L3
MB
220/380 V
RM
N
1
2
3
4
5
6
7
8
9 10 11 12
MR
Ima
VE2
PS
TC
LR Tmf
TR
VE1
FR
L1
MPE
N
L(2)
N(4)
U(1)
U(3)
FA
MMS
12
11
Tmin
N-N
15
14
13
R1 R2 R3
R4
F
IGR
L1
L2
L3
9
N
TMAX
RR
F
IGR
L1
L2
L3
9
N
TMAX
RR
400 V
230 V
CR
CR
MR
MR
N
N
BRR
BRR
13
N
MR
F
L1
L2
L3
9
N
TMAX
RR
F
IGR
L1
L2
L3
9
N
TMAX
RR
400 V
230 V
CR
CR
MR
MR
N
N
BRR
BRR
13
N
MR
13
N
MR
PNZ 30-50-75-100-130 BURNER CONNECTIONS
PNZ 75-100-130 TANK RESISTANCE CONNECTIONS
PNZ 30-50 TANK RESISTANCE CONNECTIONS
CAUTION: A N-N connection is indispensable for the proper functio-
ning of auxiliary resistances.
CAPTION
BRM Relay
coil
BRR
Resistance relay coil
CR
Tank resistance contacts
CT
Thermal relay contact
F Fuse
FA Anti-disturbance
filter
FR Photoresistance
IG Main
switch
IGR
Resistance man switch
Ima Start-stop
switch
LR
Block warning light
MB Burner
motor
MMB
LANDIS SQN. Servoc. termin
MPE
App. LOA 44…/LMO 44 terminal
MR Restart
terminal
PS Unblock-reset
button
R1,2,3 VE-support
resistance
R4 Pump
resistance
RR Resistance
relay
RM
Motor relay contacts
RT Thermal
relay
TC Boiler
thermostat
Tmin Minimum
thermostat
Tmax Maximum
thermostat
Tmf
Thermostat modul. 2nd flame (event.)
TR Ignition
thermostat
VE1
Elect. valve 1st phase
VE2
Elect. valve 2nd phase
N.B. With a three-phase 400 V connection, the neutral cable which supplies resistances R1-R4 must be taken from the
supply line of tank resistance.
N.B. With a three-phase 230 V connection, resistances R1-R4 are supplied with a two-phase 230 V voltage.
FIG. 6
