8
0
U
22°C
40°C
50°C
5.8 - SPECIAL OPERATING FEATURES
5.8.1 - ANTI-FREEZE PROTECTION OF WATER HEAT EXCHANGER
• 2 functions performed:
- control of a heating resistor,
- anti-freeze alarm stopping the machine.
• Operating diagram (see opposite).
Freeze alarm
Resistor control
Max. voltage
Min.
voltage
Condensing
temperature
2°C
1°C
0°C
3°C
4°C
0
1
1
0
0
The setting of these thresholds can be changed in the factory on request to suit the machine’s operating conditions.
5.8.2 - REMOTE CONTROL
• Do not use this contactor for the "Heating/cooling floor" application.
5.8.3 - REMOTE CONTROL
• See details in paragraph 4.2.3.
5.8.4 - POWER CUT
• If the power is cut to the control circuits, the electronic control unit returns to the operating mode it was in before the power was
cut and the parameters are still stored in memory when the power is restored.
5.8.5 - HEAD PRESSURE CONTROL
• The PMERV 5 comes with a factory-installed specific voltage control
board, controlled directly by the
µ
CHILLER electronic control device.
• On the basis of temperature information (taken by the probe S3 located on
the condenser), the control unit varies the fan’s supply voltage according
to the diagram opposite.
• This system is operational in cooling mode.
SUMMARY TABLE OF ALARMS
(*) Factory settings
5.7 - ALARMS
• When an alarm occurs:
- the bell rings (2 A closing contact - 250 VAC max.),
- the display flashes and the alarm message appears cyclically (see table below),
- the machine stops if necessary (see table below).
• Remedy the fault.
Important note: any work must be done by qualified, experienced person.
• The alarm is cancelled automatically when the fault is cleared.
NOTE: If the circulation pump control is used, the "Water output" alarm may need to be reset manually by simultaneously pressing
the
▲
(2) and
▼
(3) keys.
• At that moment:
- the alarm report is de-activated,
- the display reverts to normal (no flashing),
- the machine can re-start (if it was stopped).
Fault on probe 1
Fault on probe 2
Fault on probe 3
Water flow rate
H.P. (unused)
L.P.
Water heat exchanger frozen
Defrosting too long
Compressor maintenance
Memory error
Min. voltage
supply control
Max. voltage
supply control
Interference on
supply control
E1
E2
E3
FL
H1
L1
A1
r1
n1
EE
EP
EU
EO
EL
-
-
-
30" on start-up
10" in operation
-
150" on start-up
-
-
-
-
-
-
-
-
-
-
-
Pressure switch
Pressure switch
2
°
C
10 mn
10 000 h
-
-
-
-
Auto
Auto
Auto
Auto
Auto
Auto
Auto
Auto
Manual
According
to
seriousness
of fault
Auto
Auto
Auto
X
X
X
X
X
X
X
-
According
to
seriousness
of fault
According to
seriousness
of fault
X
-
X
-
According
to
seriousness
of fault
According to
seriousness
of fault
X
-
X
X
X
X
X
X
X
-
According
to
seriousness
of fault
According to
seriousness
of fault
X
-
Actuates anti-freeze
resistors
Alarm enabled if pump
running
Fan time delay, stopped 1’
Self-cancellation with
correct defrosting cycle
After-sales department
operation to renew
parameters or change
the electronics
Ventilation
on high speed
Inhibition
delay (*)
Threshold
(*)
Machine
stop
Pump
stop
Cancellation
Report
Remarks
Alarm
Message
NOTE: The alarms are not activated when the machine is off (except for probe and memory faults).
