Unigas P20, Installation, Operation And Maintanance Manual, Page: 31 / 52

PART II: OPERATION 31
Electrical diagrams 04-622 - 04-642 - 05-615 - complete key
BV Fan motor remote contactor coil
CTV Contacts of fan motor overload tripped
CV Fan motor contactor contacts
ER Flame detection electrode
EV1 Network side solenoid gas valve (or valves group)
EV2 Burner side solenoid gas valve (or valves group)
F÷F2 Fuses
IG Main switch
IL Line switch
L Phase
LAF Burner high flame operation signaling light (2nd stage)
LB Burner lockout signaling light
LBF Burner low flame operation signalization light (1st stage)
LEV1 Signalization light for EV1 opening
LEV2 Signalization light for EV2 opening
LGB22.33/LMG22.33 LANDIS flame control device
LPG Gas in the network signaling light
LPG MIN Low pressure in the network signaling light
LS Burner in stand-by signaling light
LSPG Valves leakage signaling light
LT Intervention of fan motor overload tripped signaling light
LTA Ignition transformer in operation signaling light
MA Burner power supply terminal block
MC Terminal block for burner components connection
MV Fan motor
N Neutral
PA Air pressure switch
PG Minimum gas pressure switch
PGMAX Maximum gas pressure switch (optional, if fitted remove the bridge between terminals 156 and 158 on terminal block
MC)
PGMIN Minimum gas pressure switch
PS Flame reset pushbutton
Pt100 Connection for thermoresistor Pt 100
RWF40.000* Landis modulator
SD-0/4÷20mA Probe connection with signal 0÷20mA / 4÷20mA
SD-0÷10V Probe connection with signal 0÷10V
SD-PRESS. 3 terminals pressure probe connection (LANDIS QBE620…)
SD-TEMP 2 terminals themperature probe connection (Pt1000 o LANDIS QAE2..-QAC2..)
SQN30.251 Landis servocontrol for air damper (alternate)
SQN70.424A20 Landis servocontrol for air damper (alternate)
ST Thermostats or pressure switches group
STA12B3.41/63N21L Berger servocontrol for air damper
STA15B3.41/83N21L Berger servocontrol for air damper (alternate)
TA Ignition transformer
TC Themperature probe connection
TV Fan motor overload tripped
VPS504 Dungs valves leakage control device (otional, if fitted remove the bridge between terminals 177 and 178 on terminal
board MC)
Link the terminal G on the RWF40 modulator with the teminal G on the probe (terminal 13 on terminal board MA) only if a probe is connected.
SERVOCONTROL CAMS
*The modulator includes a limit switch (trminals Q 13 and Q14 on RWF40); it stops the burner if the working parameter overcomes the set diffe-
rential.
ATTENTION:
1 - Power supply: 400V 50Hz 3N a.c.three-phase and 230V 50Hz 2N a.c. monophase
2 - Don’t reverse phase and neutral
3 - Ensure the burner is properly earthed
LANDIS
SQN30.251
BERGER
STA1xB3.41/x
LANDIS
SQN70.424A20
I ST2 RED High flame
II ST0 BLUE Stand by
III ST1 ORANGE Low flame
V MV BLACK Not used