NG DP
TECHNICAL SERVICE MANUAL
5
4
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Once the defrosting stage is over, the cycle begins again, and so it continues until the bin is
full of ice, and contact between the bin thermostat situated at the top of the bin and the ice will
stop the machine. The bin thermostat will never stop the machine in mid-cycle.
OPERATING PRINCIPLE FOLLOWING THE ELECTRIC DIAGRAM (TIMER ON DEFROST -
MICROSWITCHES DEPRESSED).
-
The ITV model NG has two switches:
1
st
In the frontal side of the machine (with led). This turns the machine on or off when we press
it.
2
nd
The second switch is located in the electrical panel. This one stops the condensing unit, but
keeps the hydraulic part in operation and allows to do the cleaning of the machine (except in
NDP20 model).
-
Current reaches the machine via the line connecting the blue (1) and brown (2) terminals. The
brown wire connects the compressor and timer motor. The blue wire connects bin thermostat T1
which closes the circuit with 2. A different blue wire goes to 2 on terminal G1 which at this
moment is connecting 1 and 4.
-
A red wire connects bin thermostat T1 and micros G1 and G2 which close the circuit with 4
and provide current via G1 to the timer G
.
-
At this point the following are connected:
❖
COMPRESSOR (S)
❖
WATER INLET VALVE (P)
❖
HOT GAS VALVE (Q)
❖
TIMER MOTOR (G)
-
Since the motor of the timer (G) is working, during 1
3 minutes the roler of micro of the second
water inlet coil (cleaning valve drive) is depressed until the pins release the micro, closing this
valve.
-
After 2 to 4 minutes micros G1 and G2 will open and close circuits 1-2.
