FloAire DX COIL User Manual
Page 5
EVAPORATOR IOM
12. Use a vacuum pump to evacuate the coil and any interconnecting piping that has been
open to atmosphere. Measure the vacuum in the piping using a micron gauge located as
far from the pump as possible (the vacuum at the pump will be greater than the rest of the
system). Evacuate the coil to 500 microns or less then close the valve between the pump
and the system. If the vacuum holds to 500 microns or less for one minute, the system is
ready to be charged or refrigerant pumped down in another portion of the system can be
opened to the coil. A steady rise in microns would indicate that moisture is still present
and that the coil should be further vacuumed until the moisture has been removed.
13. Failure to obtain a high vacuum is indicative of a great deal of moisture or a small leak.
Break the vacuum with a charge of dry nitrogen or other suitable gas and recheck for
leaks (soapy water works well). If no leaks are found, continue vacuuming the coil until
the desired vacuum is reached.
14. All field piping must be self-supporting.
15. Refer to Figures 4 - Hot Gas Bypass Kit Installed and Figure 5 - General Diagram, for
general piping.
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Figure 2 - Distributor
Figure3 - Hot Gas Bypass Kit