Installation Guide

INSTALLATION
11
3.8 Leak Test………………………………………………..................................
WARNING
It is the licensed HVAC installing contractors responsibility to follow all safety procedures
and to utilize all required personal protective equipment while leak testing with high
pressure dry nitrogen. Failure to do so could result in death or serious injury.
NOTES:
1. Indoor Unit has a factory R-410a
holding charge as shown on data
plate. Liquid and Gas service valves
on Indoor Unit must remain in the
closed position while leak testing
both refrigerant lines with dry nitrogen.
2. Refrigerant lines must be leak tested to a
minimum of 500 psi with the use of dry
nitrogen and pressure must hold at 500 psi
or higher for a minimum of 1 hour.
Recommend first pressurizing refrigerant lines to 100 psi with the use of dry nitrogen,
then continuing to a minimum of 500 psi if no leaks are found to be present.
3.9 Evacuation……………………………………………………………………....
NOTES:
1. Safely release dry nitrogen from
refrigerant lines.
2. Evacuate refrigerant lines with the use
of a vacuum pump and micron gauge.
3. Refrigerant lines must be evacuated
to a minimum of 200 microns or less.
After shutting of vacuum pump, vacuum
must hold for a minimum of 1 hour without
rising above 500 microns to ensure that no
moisture or non-condensables are present.
Recommend attaching micron gauge directly to the vacuum pump to test and verify it is capable of
reaching 50-100 microns or less, before starting evacuation process. If this level of vacuum
cannot be reached during the test, replacing the vacuum pump oil or vacuum pump itself may be
necessary to achieve the 500 micron or less vacuum required.
3.10 Refrigerant Charge…………………………………………………………….
NOTES:
1. Indoor Unit has a factory R-410a holding charge as shown on data plate.
2. Refer to FLEXX Outdoor Unit Installation Manual for refrigerant charge instructions.