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REVO-E Heat pump 5 Troubleshooting
5 Troubleshooting
5.1 General
Follow the safety information and conditions from
Chapter 1 (see 1.6 ).
This section describes how to look for and eliminate errors
in the REVO-E air-conditioning system.
In the event of doubt, Chapters 3 and 4 contain the func-
tional relationships.
When searching for errors and how to eliminate them, a
systematic procedure is required. The corresponding
measures for malfunctions of a general type or for devia-
tions from desired conditions are to be implemented as
described below.
5.2 Malfunctions in the air-conditioning
circuit
5.2.1 Causes of malfunctions in the air-
conditioning system
– defective double radial blower or axial fan
– dirty or blocked air filter, dirty condenser or compres-
sor fins
– refrigerant quantity not according to specification
– defective solenoid valve ADA or solenoid valve in the
front box
– malfunctions in the expansion valve
– foreign gas in the refrigerant circuit
– insufficiently evacuated refrigerant circuit (final
vacuum <10 mbar)
5.2.2 What to do for malfunctions in the
refrigerant circuit
If errors in the refrigerant circuit appear, the system must
be inspected by a specialist and properly serviced. Do not
allow the refrigerant to release into the atmosphere under
any circumstances.
5.2.3 Why the desired conditions are not
reached when testing pressure
If deviations from the desired conditions are determined
when testing the pressure, the following may have caused
this.
Pressure is too high at the high-pressure manometer
– too low air flow rate at the heat exchanger (AC opera-
tion of outer heat exchanger / HP operation => inner
heat exchanger)
– too much refrigerant
Pressure is too low at the high-pressure manometer
– too little refrigerant
– compressor speed too low (system in regular opera-
tion, maximum speed can be forced with the DCT
component test)
– defective compressor
Verify and localize these causes, service or replace, as
needed, defective parts.
5.3 Malfunctions in the electrical system
Only conduct installation, maintenance and repair
work if the motor is still and the 24V DC power supply
as well as the high-voltage has been switched off.
Before starting work on the air-conditioning system,
ensure that the system is voltage free and make sure
it remains so for the duration of the work.
In certain cases, the following safety rules must be
followed:
– ensure the system is voltage free
– ensure system will not be reactivated
– verify system is voltage free
– ground and short-circuit
– cover or block off neighboring voltage-carrying
parts
Electrical work may only commence if protective
measures against electrical shock, short-circuits and
electric arcs have been taken.
Potential risk to health
and life!
Warning!
High voltage!
Caution
Mortal danger!
Warning!
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