two pipes and one cable for condenser are to be laid. More the number, the opening should be more. This opening varies on the basis of number of package A.C. This opening is also to be kept in the package room and the rooms through which the pipes are to be laid. The location of the fresh air fan should be such that the fresh air should not directly hit the delivery duct.Ĥ.1.4 Opening for refrigerant pipes & condenser cables :. So the opening can be made as 610mm圆10mm allowing the frame work for fixing the duct. Generally the size of the fresh air fan ducting is 600mm圆00mm. Opening for the fresh air fan is kept in the package room. In the same method as specified above the opening for return air duct or boxing can be calculated. can be calculated.Ĥ.1.2 Opening of return air duct/boxing : In the same manner the opening for other branch duct etc. the opening of the wall should be slightly more than the cross section of the duct, the opening may be 6 sq. Now the cross section of the main duct will be 7000/1312 = 5.34 Sq.feet. Let us take 400 mtrs (1312 feet) per minute for this job. As per this chart the maximum permissible velocity of air through main delivery duct is 500 meters per minute. Now velocity of air to be delivered through the main duct is to be decided as per the recommended chart for duct design. is kept as standby, the approximate quantity of air to be handled by the main duct will be = 2 x 7 x 500 (500 CFM has been considered per TR) = 7000 cm. their capacities are to be calculated.Īs for example if two number of 7 TR capacity of package are kept as main and one number package A.C. If approved duct drawing is not available with the JTO(E), the size of the opening is to be decided on the basis of permissible air to be delivered by the duct is to be known, and the number of package A.C. The openings are required in the package room, switch room or in any other room where A.C. If the duct drawing is available with the junior engineer, the opening is to be made as per that duct drawing. During construction of the building following openings are to be made either in the walls or in the floors.ī) Opening for the return air duct/boxing.Ĭ) Opening for fresh air fan in the package room wall.ĭ) Opening for refrigerant pipes and condenser cables.į) Opening for supply water pipe for humidification package unit and drainage pipe for condensed water. After obtaining the working drawing the JTO(E)has to study the schedule of Accommodation thoroughly, specially the package room and the rooms which are to be air conditioned. system in any building required utmost caution and coordination from the very beginning of the construction of the building/Exchange. Objective :- After discussion of this the trainees will be able to install the package A.C units in a proper &correct method, so that during their use there will be minimum complaints. units is one of the most important activities pertaining to the electrical wing. The modern Telephone Exchanges install the Electronics Equipments. Purpose :- Now a days every Telephone Exchange requires Air Conditioning. How to Install a package AC units? Installation of package AC units (Air Cooled):
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