0906-E
33
FAULT CODES
LOW PRESSURE CUT OUT
Fault Code: 1n7
Description
The low pressure cut out limit depends on the type of refrigerant which is inside the circuit and is defined as
following:
R407C " 1,5 bar abs. (Or –28°C Vapour Saturated Temperature).
One compressor on circuit n does not work for 2 minutes and in the case of a unit with low ambient kit and
Thermostatic Expansion Valve, the TXV bypass valve has been closed for 1 minute, but the low pressure is
too low.
NOTE
: Only units with thermostatic expansion valves and Low ambient kit options are fitted with TXV
bypass.
Action
$ If the Low Pressure of a circuit is below the safety limit for more than an hour, then the considered
circuit is not allowed to start again.
$ This circuit is shut down immediately.
$ A fault signal is shown on the display.
$ The remote fault signal is delayed by 6 minutes.
Reset
Automatic reset of the fault signal as soon as the low pressure moves above the “CUT OUT” limit
If the low pressure fault is activated more than three times during the same day, the fault signal is locked out
and must be reset manually.
The auto reset limits are detailed below
R407C " 2.5 bars abs. (or –16°C saturated vapour temperature).
Note: Fault counter is cleared and reset every day at 10 am, as long as the maximum number of faults
has not been reached.
Possible causes Solving the problem
Not enough refrigerant in the circuit. Adjust the refrigerant charge
Faulty expansion valve. Check the good working of the expansion valve.
Dirty filter drier. Change the filter drier
Faulty low pressure sensor. Replace the low pressure sensor.
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