PD 52 transfer switch hum normal?

Check for loose connections.
Think about replacement as it will fail when you need it the most.

enblethen wrote:
Check for loose connections.
Think about replacement as it will fail when you need it the most.

I tightened connections. No change

Is there a better model available?

They buzz when the relays get dirt inside and the two parts of the armature cannot "seal up" tight. Once you are home and have time, dismantle the relay and clean it out. If necessary, sand the mating surfaces against a sheet of fine sandpaper on a flat surface. With alternating current relays, if the two metal surfaces cannot solidly connect with each other in addition to buzzing it also can make the relay coil run hot and eventually fail. You can also buy new relays fairly inexpensively to replace it once you get it out and can identify it. eBay is your friend. If you buy a completely new transfer switch, get the PD52DCS model as they utilize internal rectifiers to furnish DC (direct current) to a DC coil relay that will not buzz when it gets dirt in it and will not burn out from not "sealing up" properly like is very necessary with an AC coil. A hazard of using AC coils in an RV that gets exposed to a lot of dirt and dust.

I recommend a new transfer switch.

http://www.bestconverter.com/50-Amp-Transfer-Switches_c_183.html

garyemunson wrote:
They buzz when the relays get dirt inside and the two parts of the armature cannot "seal up" tight. Once you are home and have time, dismantle the relay and clean it out. If necessary, sand the mating surfaces against a sheet of fine sandpaper on a flat surface. With alternating current relays, if the two metal surfaces cannot solidly connect with each other in addition to buzzing it also can make the relay coil run hot and eventually fail. You can also buy new relays fairly inexpensively to replace it once you get it out and can identify it. eBay is your friend. If you buy a completely new transfer switch, get the PD52DCS model as they utilize internal rectifiers to furnish DC (direct current) to a DC coil relay that will not buzz when it gets dirt in it and will not burn out from not "sealing up" properly like is very necessary with an AC coil. A hazard of using AC coils in an RV that gets exposed to a lot of dirt and dust.

Will this pd52dcs be a direct bolt on replacement for mine?

I understand they are. The DC conversion is all internal. You might want to go to their website and submit a question. I've had to clean relays about every 3 years on our last 2 RVs. After a while you get good at it. It's dusty here out West.

How old are they... If you happen to have cause to be in centeral south lower Michigan (Marshall) they may be able to fix it for you if they are new enough or for a slight fee.

I have a PD 9180 converter that died.. Walked into the plant (off Old US_27 on industral) and the gal ask "Can I help you" I pointed to the box and said "DEAD" she sent me through a pair of double doors wehere we did the Can I help you thing again she said on my desk.. 238 dollars later I walked out with a brand new Factory Refurb and on the road again.

mine always did till I sold is 15 years later

UPDATE: Thank you for your responses. I bought and am having installed the new PD52DCS at camping world next week. Note: They had a sale on the unit, plus $25 off on President's day, plus $59 this month to install anything. Seemingly a good deal.

garyemunson wrote:
I understand they are. The DC conversion is all internal. You might want to go to their website and submit a question. I've had to clean relays about every 3 years on our last 2 RVs. After a while you get good at it. It's dusty here out West.

Thanks Gary. I did call PD and he said the DCS will transfer over easily. Main difference is the size of the box.