I think the reason for nitrogen purge is simple. To eliminate moisture from the system which is destructive.

Is it a good idea to purge my A/C system with nitrogen before charging to remove moisture? The lines were flushed and left open a month ago. RV is garaged here in SoCa. New compressor and components were professionally flushed before installation.

Yes but that single switch needs to be plumbed into the low side, right???

For some reason the coach builders put both bungs on the HP side, one back near the compressor and on up front at the condensor area. None on the LP side. This is not consistent with what Trans/Air recommends. They suggest one on each side. Since I don't want to add more bungs, the question is will ...

Tim wrote:

bohica2xo wrote:You can place the LPCO in series with the HPCO when installed in the High side of the loop.

Knowing the thread on the ports would help also. Most binary switches in Santech catalog are low/high in a single switch.

Aren't ALL binary switches low/high switches by definition?

It's not a standard bus but a Wanderlodge motorhome on a short Bluebird bus chassis. It is the only one of it's kind and was produced for the CEO at a cost of 1.2 million since it was custom built at the Bluebird factory in 1995. It is only 26 feet as opposed to all the other Bluebirds at 42 ft. plu...

I don't have an accumulator in the system. So where does that leave me? The binary I have by the pump high side shuts off under 30 psi and over 406 psi. The forward bung is disconnected as of yet.

Where are the two needed areas? I have two bungs, both on the high pressure line. One back by the pump and one up front by the condensor/evap line. It's a diesel pusher.

The Trans Air tech guy recommended running high and low pressure switches. But when I look at pressure switches, I find many binary types that are supposed to protect the system for over or under some pre-set pressure.??? Can you depend on these single switches or should I go back to two separate sw...

Sanden calls for their own SP20 oil in my new compressor. Isn't PAG 100 the same thing? It's a whole lot cheaper.