EarthLinked SC Series, Быстрый старт, Страница: 25 / 35

SC-410-QS (05/11) Page 25
System Start-up
Evacuation/Charging
1. SC, SD, SCW, HC, HCW, HW and HWW Models
Refer to Figure 20 and the following description:
a. Seal Test Evacuation and Initial Charge
1. Carefully vent the nitrogen charge from the compressor unit.
2. After installing and nitrogen brazing the HVAC system components and
compressor unit service valves, turn the service valves “OFF” and pressurize the
HVAC components to 150 psig with dry nitrogen and a trace of refrigerant. Valve
off the nitrogen tank from the HVAC system components and check joints with a
sensitive electronic leak detector to ensure they are sealed. Check the pressure
gage after 15 minutes and verify the original pressure has not decreased. Repair
the leaks and re-test as appropriate.
3. After venting the pressurized system, connect the gage block, refrigerant
container and hoses as shown in Figure 20. LP and HP valves are fully open.
Both service valves are fully opened.
4. As illustrated in Figure 20, connect a good quality digital micron gage to the liquid
line service valve access port. Connect a vacuum pump at least 6 CFM capacity
to the gage block.
5. Connect the refrigerant hose from the refrigerant container to the charging port.
Purge the charging hose of air, tighten the hose connection to the charging port
and close the valve on the refrigerant container.