25
Aermec cod. 4086995_01 05.2013
NRL FC 2000-3600 60Hz
EN
10.
FuNCTIONING CHARACTERISTICS
10.1. COOLING SET POINT
(Default defined) = 44.6°F/7°C, ∆t = 10.01°F/5°C.
10.2. COMPRESSOR START DELAY
To prevent the compressor start too close to each
other, two functions have been arranged.
- Minimum time from last turn-off 60 seconds.
- Minimum time from last start 300 seconds.
10.3. CIRCuLATION PuMP
The electronic board provides an output to manage the
circulation pump.
after the first 10 seconds of the pump operation, when
the water flow rate is running, activate the function of
water flow rate alarm (flow switch).
10.4.
anti-freeZe alarM
the anti-freeze alarm is active as if the machine is tur
-
ned-off or if the machine is in standby mode. in order
to prevent breakage of the plate-type exchanger due
to freezing water contained, the compressor is locked
(if the machine is turned on under 39.2°F/4°C) and the
resistance starts up (if standby below 41°F/5°C). If the
temperature detected by the probe in the exchanger
output and in the chiller input is below 39.2°F/4°C.
WARNING:
The anTi-freeze seT TemperaTure can
be varied only by an auThorised ser-
vice cenTre and only afTer verifying
ThaT in The waTer circuiT is an anTi-
freeze soluTion
.
the intervention of this alarm sets the compressor
block and not of the pump, which remains active, and
the resistance starts-up if installed.
For the restoration of the normal functions of the
temperature of the water output have to come back
over 39.2°F/4°C, the reset is manual.
WARNING:
aT any inTervenTions of This alarm iT
is recommended To immediaTely con-
TacT The nearesT Technical service
assisTance
10.5. WATER FLOW RATE ALARM
the gR3 manages a water flow alarm controlled by
a flow meter installed as standard on the machine.
this type of safety device can activate after the first
10 operating seconds of the pump if the water flow is
insufficient.
This alarm sets the block of the compressor and the
pump.
11.
REGuLAR MAINTENANCE
any cleaning operation is forbidden before disconnec
-
ting the unit from the power supply.
Check for voltage before operating.
periodic maintenance is essential to maintain the unit
in perfect working order under the functional as well
as the energetic aspect.
therefore it is essential to provide yearly controls for
the:
11.1. HYDRAuLIC CIRCuIT
Control:
• water circuit filling;
• water filter cleaning;
• Flow switch control;
• air in the circuit (leaks);
• that the water flow rate to the evaporator is always
constant;
• the hydraulic piping thermal insulation state;
• where provided the percentage of glycol.
11.2. ELECTRIC CIRCuIT
Control:
• Efficiency of safety devices;
• Electrical power supply;
• Electrical power consumption;
• Connections tightened;
• Function of the compressor housing resistance.
11.3. CHILLER CIRCuIT
Control:
• Compressor conditions;
• Efficiency of the plate-type exchanger resistance;
• working pressure;
• loss test for the control of the sealing of the refrige
-
rant circuit;
• Function of high and low pressure switches;
• perform the necessary checks on the filter-drier to
verify their efficiency.
11.4. MECHANICAL CONTROLS
Control:
• the screws, compressors and the electric box of the
unit external panelling are properly tightened. if they
are poorly tightened, they produce abnormal noise and
vibrations;
• the structure conditions; if necessary, treat oxidised
parts with paints suitable for eliminating or reducing
oxidation.
ATTENTION
Inspection, maintenance and
possible repair operations must be
carried out only by an authorised
technician according to the law.
ATTENTION
A deficient check/maintenance
operation may result in damage to
things and people.
ATTENTION
For machines installed near the
sea the maintenance intervals
must be halved.