Question

A technician is diagnosing an air-conditioning system. With the manifold gauge set connected and the system stabilized, the gauges indicate readings lower than specifications on the low side. The technician also notices heavy frost on the inlet of the expansion valve. What can be the cause of this problem?

          A technician is diagnosing an air-conditioning system. With the manifold gauge set connected and the system stabilized, the gauges indicate readings lower than specifications on the low side. The technician also notices heavy frost on the inlet of the expansion valve. What can be the cause of this problem?
        
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University Physics with Modern Physics
University Physics with Modern Physics
Hugh D. Young 14th Edition
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A technician is diagnosing an air-conditioning system. With the manifold gauge set connected and the system stabilized, the gauges indicate readings lower than specifications on the low side. The technician also notices heavy frost on the inlet of the expansion valve. What can be the cause of this problem?
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Transcript

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00:01 Hello students, there can be multiple reasons for the medium temperature work in cooler assembly not cooling the box properly.
00:12 Some of the important causes can be first in evaporator the moisture from the air could be freezed on the evaporator or cooling coil cooling coil thereby forming a insulation for the heat transfer process.
00:40 So the solution for this problem is that the defrost cycle is present that removes the frozen material due to this the compressor work continuous.
00:50 So because it has the work at a higher differential pressure that is higher differential pressure air flow also decrease as the passage becomes narrow.
01:12 Now next the condenser coil could be placed in the area having low value of air flow to remove heat.
01:23 So this increase the head pressure.
01:29 So the solution for this is the unit should be placed in a well insulated area well insulated area so that this will not happen.
01:42 Next the door gusset of the cooling unit is not sealed properly maybe this happened thereby allowing the escape of cold air from the unit.
01:54 So the solution for this is the proper prevention proper prevention inspection and maintenance and maintenance to check the door gusset should be done.
02:14 Next temperature control setting temperature control setting could have been accidentally changed thereby not rendering proper cooling to check the temperature setting properly check the temperature setting properly...
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