25
-
Remove the liquid line connection cap.
-
Then remove the suction connection cap.
-
Open both valves midway.
-
Care should be taken to avoid the holding charge from releasing too quickly.
-
Be sure tube fitting inner diameter and tube outer diameter are clean prior to
assembly.
-
Since both tubes are extended from the condensing unit housing, we recommend
insulating the housing by using a wet cloth on the copper tubing.
-
Recommended brazing materials: a copper / phosphorous or copper / phosphorous /
silver alloy rod should be used for joining copper to copper whereas to join dissimilar or
ferric metals, use a silver alloy rod, either flux coated or with a separate.
-
Use a double tip torch.
g. Start-up & Operation
-
Initial pressure test (by vacuum and nitrogen)
Step-by-step
•
Use a 4-port gauge manifold with 3/8” hose and connections to the vacuum
pump. The vacuum gauge does not have to be connected for this part of the
process.
•
Connect the gauges to service ports provided on receiver valve and suction
tube. In order to remove any non-condensable that may have entered the
system during installation, follow these steps:
•
Start the vacuum pump. The evaporator fan should be running and the
compressor crankcase heater is energized at this point. This will involve
powering up the unit so it is important to disconnect the live feed wire to the
compressor contactor (so the compressor cannot run and the crankcase
heater
can be energized).
•
Open both valves on the manifold and then open the main vacuum valve on
the pump. Run the system until the vacuum level of -0.85 bar (as read on
manifold gauge) is achieved.
