EarthLinked SC Series, Быстрый старт, Страница: 27 / 35

SC-410-QS (05/11) Page 27
7. Close the LP and HP valves on the gage block. Disconnect the vacuum pump
and the utility hose from the gage block. Disconnect the digital micron gage from
the liquid earth loop service valve.
8. Open the refrigerant container valve and inject liquid refrigerant into the
charging port as shown in Figure 20.
9. For SC, SD and SCW Compressor Units: Charge with liquid refrigerant until 3
pounds of refrigerant per ton of system capacity, has entered the system.
Liquid entering the system at the charging port goes directly to the system earth
loops. It does not go to the compressor. Should the pressures equalize and
prevent the intended charge from entering completely, terminate the process of
initial charging.
10. When the initial refrigerant charge (see step 9 above) has entered the system,
close the refrigerant container valve and disconnect the refrigerant hose from the
charging port.
11. The system has now been initially charged.
b. Final Charge
It is critical to control the conditions under which the compressor unit operates while final
charging the system.
Air Handler Systems
If heating is provided by one of the following DX air handler systems, as shown in
Figure 21, the return air to the air handler during the final charging is to be
maintained in the range of 70°F to 80°F.
If necessary, the air can be warmed with
electric supplemental heat in the air handler. (Shunt “R” to “W2” at the terminal block.)