Manual - G5Twin - 2011.indd

Helpful Hints

(continued)

REMOVE RESTRICTIONS AT THE VALVES, FITTINGS & HOSES

AC/R Systems are generally not designed specifically for the recovery process, and this is reflected in the wide use of 1/4” access valves with “Schrader”-type valve cores. These valve cores block about

90% of the flow through the access port, and require the use of core depressors in the hose fittings.

When left in during the recovery process, both of these items can significantly restrict the flow of refrigerant, making the recovery process take up to six times longer to complete.

Use a Valve Core Removal Tool to remove these valves cores while leaving the system seal intact, as shown in Diagram 8. These tools are available from your local wholesale distributor. Core depressors in the ends of the hoses should be removed as well.

Diagram 8

Use ball valves or open-ended hoses. Another common restriction is found in charging hoses that have “Quick Disconnect, Low Loss” fittings. These fittings use a restrictive internal check valve to limit venting when disconnecting the hose from the system. While these may be useful in charging setups, they restrict the flow of refrigerant, and are not ideal for use in refrigerant recovery.

Use the shortest length of 3/8” hose for fast recovery. The length and diameter of the hose can also impact the recovery speed. Even when recovering through 1/4” fittings, using 3/8” hose will allow for greater vapor flow, and greatly reduce the time needed for the recovery process.

Imagine trying to drink water through a 1/4-in., 3-ft. long straw. Now pinch the end closed a little bit, and you get an idea of the kind of work your recovery machine is trying to accomplish. Using larger hoses without any restrictions will make it easier on your machine and allow you to finish the job much quicker.

EXTENSION CORDS AND LOW VOLTAGE

Recovery machines will work best when the voltage at the machine (while it is running) is about 100-

105% of the rated power (115v-122v or 230v-240v). A lower voltage can cause difficulty in starting against high pressures. If you have low voltage source power, you may need to relieve the back pressure on the unit to allow it to start.

Check that the voltage coming from the source outlet is adequate. Please note that the circuit could have many other items on it e.g. light fixtures, appliances, or other motors. Also, recovery equipment is used primarily in the hot summer months when supply voltage can be at the lowest point of the year due to the demand from A/CR equipment operating at peak conditions. These factors may cause a lower voltage and reduced performance.

Likewise, long and thin extension cords starve the motor of necessary voltage and can cause very dangerous overheating of the motor and extension cord. A hot, sunny rooftop can also reduce the ampacity of the extension cord. Refer to the extension cord sizing guidelines on Page 4.

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G5TWIN OPERATION MANUAL

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