50
system
air
Medium draining
• Shut off the isolating valves in the compressor-condenser section and evacuate Freon from the DX coil through the
special valve (using the evacuation equipment in accordance with the Montreal Protocol).
•
Disassemble the thermostat valve insert. In the case quick couplings are being used, disconnect them; if not,
unsolder the DX coil to allow its dismounting.
Maintenance
For smooth performance of the DX coil, the following operations should be carried out regularly:
•
check the soldered joints,
•
check the system pressure,
•
periodically check the inspection glass for the appearance of bubbles and humidity,
•
check the cooling circuit protection elements – mechanical and electrical,
•
in the event of prolonged interruption of operation, check the performance of the compressor sump heater,
•
check the operation of the DX fan,
•
regularly check the DX blades for dust build-up. Dust or scale build-up on the blades reduces the heat exchanger
capacity. Clean the blades at regular time intervals – approx. every 500 hours of operation.
To clean the blades, blow them with compressed air in the direction opposite to the air flow direction.
If such cleaning proves insufficient, disconnect the heat exchanger, slide it out and wash with low-pressure water or
steam. Do not use high-pressure water or steam in order to avoid deforming the aluminium blades. If washing with
water, the pressure thereof must not exceed 15 bar and the jet must be directed strictly parallel to the blades. Exposure
to a water jet at an angle will damage the blades. This applies even more so to the blades at the edge, since these are
even more fragile.
Caution
Under no circumstances should you attempt to clean the blades with a hard object.
3.7.5
Droplet eliminator
Caution
See also section 3.1 General instructions.
No piping (e.g. cooling system piping, electrical cable conduits, etc.) is to be laid through the eliminator
blades in such a manner so as to spread the blades apart.
The blades are to be free of water scale and other salt build-up. Regularly check the soiling of the blades
(once a year), and clean or replace the eliminator if necessary.
Be sure to install a properly sized siphon on the drain pipe to collect and drain the condensate.
Instructions for the construction, installation and connection are given in section 2.3.5 – Connection of
siphon.
Correct air flow direction is illustrated in figure.
