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Causes: -The sensor is not connected. Solution: -Replace sensor
HIGH PRESSURE ALARM
The label (HH) and the cell temperature are intermittently displayed one after the other; led (4) lights up each time the high pressure switch is tripped.
If the high pressure switch is tripped more than 10 times in a one-hour period, the label (PP) and the cell temperature will appear intermittently
one after the other on display (5), while the alarm relay will be activated together with led (4). Room light switch, evaporator & condenser fan
OFF. To reset the alarm, disconnect the refrigeration unit, wait for a few seconds, then restore connection.
Causes: -Ensure that the condenser fan is working properly -Ensure that the condenser is clean.
9) EMERGENCY
In case of fault or malfunctioning of the electronic control panel,if a short-term replacing is not possible, an
"EMERGENCY SYSTEM" can be used to keep the unit running until a new control panel may be installed.
The "EMERGENCY SYSTEM" consists of a terminal board sited on the control panel, fitted with 4 terminals , as
shown in picture 1.
Proceed as follows to use the system:
1) Switch the electronic control panel off by pressing the key ON/OFF (10).
N.B.: The electronic control panel should remain in this condition during the whole emergency period.
2) Switch the unit off.
3) Connect a thermostat (6 inductive Amps.) to the terminals E1 and E2 (Pict. 2).
4) Bridge terminals E2 and E3 as well as terminals E3 and E4. (Pict. 2).
5) A wire comes out from nr. 30 on the card; it is welded in the card an connented to terminal 4. Disconnect it and
let it free.
6) Enter the thermostat bulb inside room.
7) Adjust the 'stat at the required temperature and switch the unit on.
8) When the set temperature is reached, compressor, evaporator and condenser fans will stop.
9) During emergency period, defrost-cycle is cut-out;it is therefore advisable to reduce door openings to a minimum.
10) When installing a new control panel, remove all connections stated in items 3 and 4,before switching the unit on.
10) ROUTINE MAINTENANCE
- All installation, maintenance or repair interventions must be carried out exclusively by authorised personnel.
- In order to assure reliable operation of the unit the condenser must be cleaned periodically (the frequency of cleaning depends mainly on the
surroundings in which the unit is installed). This operation must be carried out with the unit stopped; we recommend using a jet of compressed
air blowing from the inside toward the outside; if this is not practical, use a brush with long bristles and brush the outside of the condenser unit
- Refrigerants (HFC) must not be disposed of in the environment.
- The plant cannot be charged with refrigerants other than the type specified on the dataplate unless this action has been previously explicitly
authorised by the manufacturer.
IMPORTANT NOTE: the units are equipped with a pressure switch monitoring condensation pressure so the condenser fan may stop during
operation of the compressor.
E
N
G
L
I
S
E4 E3 E2 E1
H
Pict. 1
T
FTE
E4 E3 E2 E1
Pict. 2
7
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