16
NARVON
6.8.2 Optionals (Timer)
The timer shown is given as an indication
only.
The timer must be set while the main switch
is positioned on -0- and the machine is
unplugged.
6.8.2.1 Setting the current time
Before you start using the timer you must set the current
date and time.
To set, turn the timer dial in the direction indicated by the
arrow until the indicator
(A) shows the correct date; then turn the pointer (C) until
reaching the current time
Do not:
- turn the pointer using a tool;
- turn the pointer in the direction opposite
that is shown in the timer.
6.8.2.2 Operating the machine
with the timer
In all machines equipped with a timer, the
user must check that the selector (B) is in the
central position .
The machine must be started as shown in Section 6.2.
Switch in position “I”:
- to obtain slushy, position the timer lever in position
on
the desired date and time;
- to obtain cold drinks, position the timer lever in position
on the desired date and time.
Switch in position “II”:
the timer is off and the machine works as a beverage cooler
only.
6.8.3 Mechanical thermostat
It is possible to regulate the temperature of machines
provided with a mechanical thermostat, when they
operate in “cold drink” mode. To do so, simply adjust the
refrigeration power using the potentiometer. To obtain a
higher refrigeration power (lower product temperature) turn
it clockwise towards higher power values.
6.8.4 Dirty filter signal
6.8.4.1 Air machines
When the machine is working in critical conditions, due to
dirt accumulated in the condenser, the insufficient air supply
at the condenser causes an increase of temperature at the
cold circuit. Optionally it is possible to install a sensor that
warns you about this situation. When it happens, a red pilot
will flash (PR).
To reset the machine it must be disconnected, the left panel
removed and the condenser cleaned (see Section 7.9).
Reconnect the machine and press the restart button (R)
situated on the right panel. The red pilot light (PR) on the
front panel will turn off.
6.8.4.2. Water machines
The machines provided with a condenser refrigerated with
water include a pressure sensor, so that, when the pressure
rises and reaches a safety value (factory setting) due to an
insufficient water supply for proper refrigeration it sends a
signal to the compressor and stops it. A red pilot light (PR)
will light up automatically on the front panel.
When this happens, the operator should stop the machine,
check the water connections and the water supply, turn the
machine back on and press the pressure switch (R) to re-
establish normal operation. The pilot light will turn off when
the machine begins to operate normally once again.
A
B
C
Fig.23
1
3
4
5
6
7
0
2
1
3
4
5
6
7
0
2
Fig.24
