Extension Cords And Low Voltage - Appion G5Twin Operation Manual

Helpful Hints
TIP #4 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, which in turn block about
50% of the flow. 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 valve cores while leaving the system seal intact, as shown
in Diagram 12. These tools are available from your local wholesale distributor. Core depressors in the ends of
the hoses should be removed as well. See Page 20 for ordering info.
Use ball valves and 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, the larger diameter hose will allow for greater vapor flow, and greatly reduce
the time needed for the recovery process. See Page 20 for ordering info.
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.
TIP #5

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.
(continued)
17
Diagram 12
G5TWIN OPERATION MANUAL
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