I have four (16k BTU) Marine Air units all plumbed to a single Marine Air P100Z raw water pump.  I'm using a 2-6 PRP pump relay.  I recently had to remount the PRP (as part of a different project) and in the process I noticed that the wires providing power to the pump, the metal housing of the PRP box, and the small resistor on the board closest to the pump power supply connections had very noticeable burn marks.  The plumbing system is currently winternized so I can't do any testing but at the end of last season the pump was swichting on and off normally.  I'm contemplating replacing the board during this off-season but I was wondering a couple of things:

1.  Is this a normal issue with the older version of the PRP board? (I think I read that the triac is mounted differently than the newer version?)

2.  Is the P100Z ok to operate on 208V power?  (The marina is on 208V instead of 230V power and I counldn't find any info in the Marine Air pump specs. Although, from the label on the pump motor it appears to be ok at 208V.)

3.  Could the P100Z be drawing too much current for the PRP at 208V?

Thanks for any help you can provide!

Chris

Hi Steve,

Thanks for the quick reply! 

I did do a visual inspection of the connections and they seem to be in order and the wiring is of appropriate gauge.

I noticed that the Dometic website doesn't even list the Marine Air PRP boxes anymore and is listing the Cruisair boxes as the only pump relay option (for both Cruisair and Marine Air brands).  http://www.dometic.com/enus/Am…..taid=85103

I haven't had a chance to completley investigate this but I assume the "trigger" voltage from the Marine Air A/C units is compatible with the PR8X pump relay box?  If so, I'll probably purchase the PR8X with the appropriate number of triggers instead of replacing the PRP board.

Thanks,

Chris

All my units are 230V so need to mix but good to know that it's possible.

Can I order the PR8X-4C through your online store or do I need to call with my order?

Thanks,

Chris