FRIULINOX ALI GROUP S.R.L. A SOCIO UNICO
76
Translation of the original instructions
Via Treviso 4, 33083 Taiedo di Chions (PN) - Italy
Service
M
an
u
al
10.1.7.
Pressure switch alarm
At the end of the fault, the alarm resets automatically.
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Pressure switch alarm
is a machine block alarm (the blast chilling cycles in progress immediately end. The
compressor and evaporator fans turn off immediately, the alarm is displayed). On single-phase models it is caused by
the intervention of the safety pressure switch “P” or by a failure of the digital input of the card.
1.
Reasons for which the “P” safety pressure switch trips:
Room temperature >43°C
Failure to respect minimum distance of 50 mm between the back of the equipment and the wall to allow
correct air recirculation. Respect the minimum required spaces -> see installation check list
Dirty condenser filter
→
clean or replace the filter
The condenser fan(s) do not work
The condenser fan(s) are connected in parallel to the compressor. With the alarm reset, start -18°C cycle
and check that they work, otherwise replace with new one(s)
Safety pressure switch out of calibration
Check that the safety pressure switch actually trips at 29.5 bar and resets at 24.5 bar
If the intervention pressure is below the intervention threshold, replace the pressure switch
Pressure switch contact polarity
Check that the high pressure switch digital input polarity parameter
Conf25
= 0
Digital input of the electronic card
With alarm on display, using the multimeter make sure that the pressure switch contact is in alarm position (NO).
If the contact is not in alarm (NC) and the alarm persists, the cause is the faulty digital input of the card. Replace the electronic
card
If the chiller presents the problem after the intervention for replacement of a refrigeration system component, make sure
that the gas charge corresponds to that shown on the rating plate.
For water condensed systems:
Check that the water valve is open
Check that the pressure valve is not locked in all closed position. Make sure that there is no dirt. If so,
clean the valve or replace it
If the safety pressure switch has not tripped,
make sure there is no false contact on the Y1 contact that takes the alarm
on the card. With NO contact alarm on the card
If the safety pressure switch has not tripped, NC contacts, the cause is the faulty digital input
of the card. Replace the electronic card