Refrigerant pump(s) are designed for pumping fluid that operates in a vacuum. The pump is external to the chiller and uses a vacuum rated motor and housing. No pumps have ever required replacement, but it can be accomplished easily if needed.
Vacuum pump is housed outside the chiller and is easily accessible. It requires periodic replacement of the vacuum
pump oil, which over time will become dirty. The pump is belt driven with an easily replaceable electric motor. As
the pump operates, some liquid water will condense in the pump and drain into a collection container. The container should be emptied once per month.
Flapper valves are simply large horizontal discs on pivot arms that move up and down to open or close on top of an o-ring. When the pressure in the lower chamber is higher than the upper chamber, the valve is pushed open by internal barometric pressure. By heating and cooling the desiccant, we raise and lower the vapor pressure in the adsorbent chamber, thus causing vapor to flow into the chamber from the evaporator. Then after heating, flow from the adsorbent chamber into the condenser. One can put his ears to the chiller to hear the soft noise that flapper valves are working. We call it the heartbeat of the chiller. If they are not working, the chiller will not provide any cooling. Manway covers provide access to the flapper valves should they ever need servicing.