High Pressure Alarm (Pressure Switch); Air Machines; Water Machines - horeca Granitore 1 Manual De Empleo

6.8.3. High pressure alarm (pressure switch)

6.8.3.1. Air machines

When the machine's working conditions are bad, due to dirt accumulated in
the condenser, fan failure etc. the insufficient supply of air to refrigerate the
condenser provokes a raise in pressure in the cooling circuit. To avoid damage
to machine elements a pressure sensor can be installed, that sends a signal to
the compressor and stops it when the pressure reaches a certain value (factory
setting). When this occurs the red pilot light lights up (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.

6.8.3.2. 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 con-
nections 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.
Fig.25
PR
SL310006542 Ed.02 - 07-2017
Before starting up a machine refrigerated by water it is neces-
sary to follow the following instructions:
1.- Take the water input tube,
2.- put the rubber joint inside the tting,
3.- connect the water input to the water network,
4.- connect the output pipe to the drain,
5.- open the water tap and
6.- turn on the machine.
R
- 13 _EN -