Low Pressure Shutdown - Cooling - CLIVET MSAN 81 Anleitung Zur Installation, Bedienung Und Wartung

LOW PRESSURE SHUTDOWN - COOLING

LOW PRESSURE SHUTDOWN
YES
Indoor unit working
YES
working efficiently?
YES
YES
Intake valve completely
YES
Intake temperature and/or
Notes
1) Check:
- That there is sufficient air flow.
- That the direction of rotation of the fans is correct.
- That the exchanger is not dirty or blocked, and can provide maximum heat exchange.
- That the solenoid valve is working.
- That the thermostat is working.
2) Check that the temperature/humidity conditions of the air being treated falls within the design conditions.
3) Check that the layout and the diameter of the pipes are correctly sized (see the section on REFRIGERANT PIPES). If not,
unacceptable pressure drops may occur for the correct operation of the unit.
4) Check, using a thermometer in direct contact, the temperature upstream and downstream of the dewatering filter. If the
difference in temperature is higher than 1°C, the filter is not working efficiently or is under-rated; in both cases, replace the
filter.
5) For information on how to perform the checks, please refer to section on START-UP.
6) If the condensing pressure is below 1200kPa there may be irregular supply to the expansion device and as a consequence
too low inlet pressure.
Check that the ventilation system for the outdoor unit is working perfectly (that is, modulates or stops the fans).
correctly?
Dewatering filter
Refrigerant charge
correct?
open?
pressure correct?
Unit working
NO
Check operation
of the indoor unit ( 1 )
Check operating conditions
of the indoor unit ( 2 )
Check connection pipes
NO
Check ∆ t from upstream
to downstream
NO
Control
subcooling/subheating (5)
NO
Check and open if
necessary
NO
Check operation
of outdoor unit
57
( 3 )
( 4 )
( 6 )