Service manual

Avantra 36/44 Service Manual
2-6 Functional Analysis
• X1, X2–Input to trigger circuit (plug-in unit) of Triac channels and coils of
power relays.
• X3 pins 1 and 2–10 VAC input for 12 VDC unregulated power supply.
• X3 pins 3 to 4–DC output (12 V) to electrical and condensation fans.
• X2–Safety switches connection. Open=> no power to trigger circuit and
relay coils.
• F, N (Phase, Neutral) Same as L1/L2–See the electrical diagram Triac/Relay
PCB.
Main power input terminals. The power source may have 2, 3, 4 wires
including ground.
• 1–57, printed circuit board terminals–Switched output to water solenoid
valve, heating elements, blower, circulation, replenishment pumps, main
motor, and step-down transformer.
2.3.2 The LUTH Power Board (LPB)
The Luth Power Board switches the necessary 2230V components on and off.
The LPB pcb includes:
• Five long life zero cross Triac channels (only four are used)
• Seven power relays with noise suppression circuits aross the contacts (only
six are used)
• 220V AC power supply to he prim. of the 24V AC transfo for the LMB02
and the crane hoist transfo
• Voltage supply for the six safety switches. Four are for the top cover’s wet
and dryer sections; two are the the front box (table lid) only in the latest
OLP version.
• Two diodes for the half-wave rectified AC replenishment pumps.