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7.5 DIRECT EXPANSION COOLING COIL AND COOLING SYSTEM
All provisions stated under the heading of 2. GENERAL SAFETY must be applied during the
commissioning and maintenance of the direct expansion heat exchanger.
Contact with the refrigerant may cause freezing of the skin and extremities. Therefore prevent
contact with the refrigerant, and use protective equipment to protect against the effects of the
refrigerant.
Since refrigerant is has no odour and taste, leaks are difficult to detect. Leakages may cause
difficulty breathing and suffocation due to the decrease of oxygen in the environment.
Therefore, gas masks must be worn while entering machine rooms in case of leakage.
7.5.1 Initial Start-up
The DX heat exchanger and the VRF outdoor unit connection must be carried out by BOREAS A.Ş.
Technical Service or experts authorized by the BOREAS A.Ş. Technical Service.
Full commissioning of the cooling system may only be carried out by BOREAS A.Ş. Technical
Service or experts authorized by the BOREAS A.Ş. Technical Service. The unit may be damaged in
case of any authorized action.
• The unit must be subjected to testing after the completion of the unit’s entire gas system
installation.
Periodic Maintenance of the Water cooling water coil:
• Check whether the heat exchanger conforms to hygiene standards, and check for
accumulated dust, corrosion, and damages.
• Purge air in the coil.
• Check the inlet and outlet pipe lines for leakages.
• Check fin surfaces, if there are any dents, straighten using a fin comb.
• Check the drain pan for clogging.
• Check whether the draining line open and works correctly.
• Check the droplet eliminator for dirt and verify that it has been correctly positioned
with
respect to the direction of air flow, according to the directional labels on the unit.
WARNING: IF THE HEAT EXCHANGER WILL NOT BE USED FOR A LONG TIME, PURGE THE WATER
WITHIN THE HEAT EXCHANGER. OTHERWISE, THE WATER MAY FREEZE AND DAMAGE THE
EXCHANGER.
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