INSTALLATION
ELECTRICAL CONNECTION
The boiler must be connected to a power supply of 230V/50Hz single-phase + ground, following the instructions below:
The system must be in compliance with the SAFETY REGULATIONS IN FORCE.
- Fit a bipolar line disconnection switch in conformity with CEI-EN regulations
(contact opening of at least 3 mm).
- Respect the L (phase) - N (neutral) connection
- Use cables with a cross-section equal to or greater than 1.5 mm2
- Refer to the wiring diagrams in this manual for any electrical operation.
- Make the ground connections to an effective ground system.
MEGA PREX N/MEGA PREX NK/MEGA PREX SL CONTROL PANEL
OPERATIONS
Use main switch (11) to power up the panel and all the connected devices.
Switches (12) and (13) in turn, power off the plant burner and pump.
Thermostat (21) is used to regulate boiler working pressure.
Min pressure thermostat stops the plant pump during start up and until the boiler temperature has reached 50°C.
In case of three-phase burners and/or pump or if electrical input exceeds 3A, remote contactors should be provided
between the boiler control panel and the load.
The electric line supplying the boiler control panel should be provided with a protection fuse-switch.
WARNING
•
For the electric connection of boilers exceeding 300.000 kcal/h rated power, the technician should make ready an addi-
tional (2nd) safety thermostat.
Legend:
A - Operating burner light
B - Counter (optional)
22 - Safety
30 - Termometer
WIRING DIAGRAM FOR BURNER AND SINGLE-PHASE PUMP
Key
IG
Main
switch
TS
Safety thermostat 110°C
TM
Min thermostat 45°C
TA
Room
thermostat
IB
Burner
switch
SB
Unit warning light
SL
Line warning light
Ch
Burner
timer
PI
Plant
pump
IPi
Plant pump switch
TR1-TR2
2 stages thermostat 1°- 2° flame
(30°-90°C
∆
t 1°- 2° flame = 7°C)
F4/K4
Connection
Thermo regolation RVP
L
N
3-20
Terminal board
B
30
22
12
A
11
13
21
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ENGLISH
Содержание DUO PREX N 180
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