Figure 10-12 shows a flood-gas and liquid leg shutoff (top hot-gas feed) system. Here, the gas-powered valve is used on both ends of the evaporator.…
In the evaporator shown in Fig. 10-10, when the defrost cycle is initiated, the hot gas is introduced through the hot-gas solenoid valve to the…
When the three-position selector switch is turned to defrost, solenoid valve A and pilot-solenoid valve D close as hot-gas valve C and evaporator-pilot valve B…
During the normal cooling cycle controlled by a thermostat, as room temperature rises above the high setting on the thermostat there is a need for…
The pilot solenoid (valve B) is a 1/8 in. ported solenoid valve that is direct operated and suitable as a liquid, suction, hot gas, or…
Figure 10-7 shows a high temperature system [above 32°F (0°C)] with no drip-pan defrost. During the normal cooling cycle, controlled by a thermostat, the room…
To defrost ammonia evaporators, it is sometimes necessary to check the plumbing arrangement and the valves used to accomplish the task. To enable hot-gas defrost…
Evaporator coils on air-conditioning units fall into two categories: Finned-tube coil is placed in the air stream of the unit. Refrigerant vaporizes in it. The…
Figure 9-81 shows how the spiral-shaped members fit together. Abetter view is shown in Fig. 9-82. The two members fit together forming crescent-shaped gas pockets.…
The scroll compressor (Fig. 9-80) is being used by the industry in response to the need to increase the efficiency of air-conditioning equipment. This is…