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SCHEDA TECNICA 97017
REPAIRS
Because of the high inflammability of R290 the repair work on the refrigerant circuit of
ECO AIR CONDITIONERS
differs from those on traditional air conditioners, expecially what concerns safety precautions.
In order to avoid any unnecessary risk and to obtain a good repair result you will have to follow strictly the described
guidelines for repairs on
ECO AIR CONDITIONERS.
SPECIAL TOOLS
-
Explosionproof
vacuum pump
- Gasdetector for
hydrocarbons
- Electronic balance which is adapted for measurments with less than
five gramm tolerance
-
LOCKRING plier
- Gas bottle homologated for propan gas and
operable with the balance
SAFETY PRECAUTIONS
Before starting any
intervention on the refrigerant circuit
of
DE'LONGHI ECO AIR CONDITIONERS
, you have to
follow the described
SAFETY PRECAUTIONS:
- Do not
smoke
.
- Do not work close to
sourses of heat
or
open flames.
- Avoid
any formation of sparks
(example: use of Vacuum cleaners, switches or causing discharges of static
electricity).
- Secure a sufficient
room volume
and
air ventilation.
- Do not only take care for yourself but also for other personal in the same room!
- You are obligated furthermore to observe all safety rules regarding transport or work with
highly inflammable gasses of your country and/or syndicate.
OPENING THE REFRIGERANT CIRCUIT
To open the refrigerant circuit do never use tools which could cause sparks like ex. saws. Furthermore it
is not allowed to unweld the tubes of the compressor. The later is also valid for the air conditioner already
emtied!
A. For repairs because of gas losses and leakages
Connect a
piercing plier
with a long
discharge tube,
whose end you hang out to the open. Make sure that the tube
cannot move and
all gas will be discharged into open air.
Pierce the compressor service pipe close to the pressure
seal (at the compressor side of it) and let all the gas discharge through the tube. Cut now the service pipe using a tube-
cutter.
B. For repairs because of system blockage (example: Capillary tube)
In case of a blockage of the refrigerant system the gas trapped between blockage and compressor
cannot be
discharged through the service pipe.
When you have the smallest impression that this might be your case
(example the customer complained about the regular intervention of the pressure switch or high power consumption
with no or little cooling) you will have to pierce also the high pressure tube between block and compressor. Do this
as close as possible to where you have diagnostisiesed the block (example: the capillary tube is blocked: pierce the
tube before the filter).
Before the conditioner is ready for repair work, you have now to clean the system off all possible remaining
gas.
CLEANING THE REFRIGERANT CIRCUIT.
After the natural discharge of the gas through piercing plier and discharge tube, there is still a considerable amount
of gas in the tubes and in the oil of the compressor. This gas has to be removed before doing any repair work. In order
to do so, connect the
explosionproof vacuum pump
to the service pipe and in case of a system blockage also to
the high pressure side of the compressor.
Discharge the outcoming gas always into the open!
Let the vacuum pump produce a good vacuum. Close now the valves of the 4 way manifold and stop the vacuum pump.
Start the compressor of the air conditioner for about 15 to 20 seconds. Repeat the vacuum in the air
conditioner.
Only now you are allowed to weld on the air conditioner in order to exchange faulty components or to close leakages.
The only exception are the connections of the tubes to the compressor.
R290 has a high ability to react with the
oil of the compressor.
The heat of the welding could set free further amounts of gas with the high risk of inflammability.
Therefore,
close to the compressor no welding is allowed.
