Delta InfraSuite RDA037, User Manual

Page: 50 / 92

InfraSuite R Series – Air Cooled Type 50
3.4.3 Vacuum Pumping
After doing a pressure leak test to confirm that there is no leakage, use the schrader valve
behind the electronic expansion valve and that of the liquid pipe to perform the vacuum
pumping process.
During the vacuum pumping process, the electronic vacuum gauge must be used to detect
the current vacuum value.
Stop vacuum pumping once the vacuum status reaches 200 Pa. The duration of the vacuum
pumping takes no less than 2 hours.
If the vacuum status is higher than 200 Pa, on the other hand, inject dry nitrogen gas until
the pressure normalizes and vacuum pumping continues. Repeat these steps till the vacuum
status is below 200 Pa.
After sitting for four hours, if the vacuum status is below 266 Pa, then the vacuum pumping
process is defined as complete.
Table 3-4: Vacuum and Charging Refrigerant Tools
Item Tool
1 Manifold with gauges (R410A)
2 Vacuum gauges
3 Vacuum pump
4 Refrigerant R410A
NOTE:
The vacuuming and filling of refrigerant must be carried out by Delta authorized
personnel.