CHARGING CYLINDER
The charging cylinder lets you charge with heat to speed up the charging process. With its heater assembly, this unit allows up to 50 W of heat to be used in charging. Refrigerant is removed rapidly from the cylinder as liquid, but injected into the system as a gas with the Vizi-Vapr. It requires no heat during the charging process.
Fig. 1-57 An electronic high-vacuum gage that reads directly in microns. (Thermal Engineering)
The Extracta-Charge device allows the serviceperson to carry small amounts of refrigerant to the job. The refrigerant can be bought in large drums and stored at the shop. The Extracta-Charge comes in a rugged, steel carrying case to protect it from tough use. It provides a method for draining refrigerant even from capillary tube, sealed systems.
It is now mandatory to capture the escaping refrigerant. The Extracta-Charge is the instrument to use. When systems are overcharged, the excess can be transported back to the drum. The amount removed can be measured also. A leak found after the charging operation usually means the loss of the full charge. Using this device, the serviceperson can extract the charge and save it for use after the leak has been found and repaired.
CHARGING OIL
In charging a compressor with oil, there is danger of drawing air and moisture into the refrigeration system. Use of the pump shown in Fig. 1-58 eliminates this danger. This pump reduces charging time by over 70 percent without pumping down the compressor. The pump fits the can with a cap seal, so the pump need not be removed until the can is empty.
Fig. 1-58 Oil charging pump. (Thermal Engineering)
It is a piston-type high-pressure pump designed to operate at pressures up to 250 psi. It pumps one quart in 20 full strokes of the piston. The pump can be connected to the compressor by a refrigerant charging line or copper tubing from a 1/2 in. male flare fitting.
CHANGING OIL
Whenever it is impossible to drain oil in the conventional manner, it becomes necessary to hook up a pump. Removing oil from refrigeration compressors before dehydrating with a vacuum is a necessity. The pump shown in Fig. 1-59 has the ability to remove one quart of oil with about 10 strokes. It is designed for use in pumping oil from refrigeration compressors, marine engines, and other equipment.
Fig. 1-59 Oil changing pump. (Thermal Engineering)
MOBILE CHARGING STATIONS
Mobile charging stations can be easily loaded into a pickup truck, van, or station wagon. They take little space. See Fig. 1-60. Stations come complete with manifold gage set, charging cylinder, instrument and tool sack, and vacuum pump. The refrigerant tank can also be mounted on the mobile charging station.
Fig. 1-60 Mobile charging station. (Thermal Engineering)
