Cooper&Hunter CH-IRT05NM, Руководство по обслуживанию, Страница: 57 / 110

Rooftop Packaged Service Manual MAINTENANCE
54
(3) Refrigerant recycling mode;
1
）
If enter refrigerant recycling mode through special operation, the displayed E3 is not an error
code. It will be eliminated when exiting refrigerant recycling mode.
2
）
If you do not want to have refrigerant lacking protection, you can enter the debugging mode
through wired controller and then cancel the refrigerant lacking protection mode.
E3 protection
Check if the
system low
pressure is lower
than 0.05MPa
No
Yes
Charge
refrigerant
according to the
requirement and
then turn on the unit
to see if E3
protection still
occurs
Yes
Enter
debugging mode
through wired
controller and select
without refrigerant
lacking protection; then
turn on the unit to see
if E3 protection still
occurs
Yes
Yes
Weld the leakage point and
recharge refrigerant after
vacuum pumping and pressure
retaining are passed
Check if there is
leakage in the
pipeline
Reconnect wire according to
the circuit diagram or replace
the pressure switch
Yes
Units are with low pressure switch
and
check if the low pressure
switch and its wiring
are normal
Replace the main control board
No