Energy Master HHPM SERIES, Инструкции по установке, эксплуатации, техническому обслуживанию и ремонту

Страница: 37 / 41

Manual Heat Pump Model HHPM-V.2- SEP 2012
36
7.9. Refrigerant charging
Ensure that the gauge isolation valves are closed.
Locate a bottle of R-134a refrigerant with enough refrigerant to completely charge the system.
Attach one end of a refrigerant charging hose to the refrigerant bottle.
Attach the other end to the "common" gauge port of the charging gauge set (do not tighten this
connection at this time).
Crack open the bottle isolation valve to allow a small quantity of refrigerant vapor to purge the line.
This vapor should be escaping from the "common" gauge port connection. After a few seconds of purging,
tighten the hose connection on the "common" gauge port.
The refrigerant charge should be weighed in using a refrigerant charging scale.
The refrigerant bottle can now be placed on the charging scale upside down (this will allow us to
charge with liquid refrigerant). Attach bottle heater (if scale is so equipped). Program scale to deliver 2.4 kg
of refrigerant.
Energize Heat Pump.
Open the gauge isolation valves.
After the scale has metered the proper amount of refrigerant, close the gauge isolation valves,
close the bottle isolation valve.
Return the system to the normal operating condition and then proceed with system startup as
discussed previously.
7.10 Scale removal
Under normal circumstances the low surface temperatures in the heat pump condenser together
with high water velocity and turbulence suppress the formation of scale and fouling. However,a severely
scaled condenser will cause the heat pump to run with excessively high Head Pressure while at the same
time exhibiting a very large difference between condensing temperature and leaving water temperature. If
such condition occurred, the heat pump required the scale removal.
Scale and fouling is the calcium deposits that can be removed by the following procedure:
De-energize the heat pump and then disconnect the power supply.
Close water valves that isolate the heat pump from the hot water system.