Unigas HTP90A, Installation, User'S, And Maintenance Manual, Page: 21 / 60

C.I.B. UNIGAS - M039219CA
21
Electrical connections
NOTE: if the burner is provided with separate control panel, please refer to the wiring diagrams.
To execute the electrical connections, proceed as follows:
1 remove the cover from the electrical board, unscrewing the fixing screws;
2 execute the electrical connections to the supply terminal board as shown in the following diagrams,
3 check the direction of the fan motor (see next pargraph)
4 refit the panel cover.
Connect the three-phase supply to terminals L1, L2, L3 and PE (ground); then shunt the phase and neutral wires (Fig. 17) for the auxi-
liaries on the printed circuit (N-terminal = neutral; L-terminal = phase)
Keys - Fig. 17
IG : main switch
KM1 : fan motor’s contactor
M : fan motor
TV : fan motor thermal cutout
Respect the basic safety rules. make sure of the connection to the earthing system. do not reverse the phase and
neutral connections. fit a differential thermal magnet switch adequate for connection to the mains.
ATTENTION: before executing the electrical connections, pay attention to turn the plant’s switch to OFF and be
sure that the burner’s main switch is in 0 position (OFF) too. Read carefully the chapter “WARNINGS”, and the
“Electrical connections” section.
WARNING: The burner is provided with an electrical bridge between terminals 6 and 7; when connecting the high/
low flame thermostat, remove this bridge before connecting the thermostat.
IMPORTANT: Connecting electrical supply wires to the burner teminal block MA, be sure that the ground wire is
longer than phase and neutral ones.
Fig. 16: Power supply terminal board
Fig. 17: Electric motor connection
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