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11.6. CONNECTING HEATING AND COOLING COILS
Connecting heat exchangers should be completed so as to protect them against possible stresses
which could cause mechanical damages or leaks. Connections on heat exchangers should not
be affected by weight of the pipework or thermal stresses. Depending on local conditions use
compensation in pipework system on supply and return in order to reduce length-wise expansion of
pipeworks. During installation of the supply system to heat exchangers with threaded connection,
heat exchanger connection should be locked using an additional wrench. The supply system should
be arranged so that it creates no interference in access to other sections of the unit. Supply and
return connections on heat exchangers should be connected so as the heat exchanger operates in
counter-flow system. Operation in counter-flow system reduces average difference in temperature
which determines the heat exchanger efficiency.
Connection of freon cooling coil to the supply system with refrigerating unit should be
carried out by a qualified cooling system technician in accordance with valid rules for
freon condensation equipment.
Fig. 5. Location of connecting pipes
