PD 52 transfer switch hum normal?

UPDATE: Sorry--been offline for some time. Major RV trip taken. Transfer switch hums "quietly". I can't hear it at all inside the rig now. Only if I open the door and listen. So I'm happy with it--I guess

crawford wrote:
I'll say it again they do hum. Now don't keep chasing you tail find a few other units while camping which have a transfer switch ask them if you can have a listen ,I bet you most or all will say please do.I had mine for 15 years and sold it that way. My new A class has a manual plug in and out no noise with that.

Take a look at the Progressive Dynamics website and call up the
PD52DCS. Their big push is that this one does NOT hum. And they told me that when I called. The new one should be here tomorrow. Installed May 7. Update then.

I'll say it again they do hum. Now don't keep chasing you tail find a few other units while camping which have a transfer switch ask them if you can have a listen ,I bet you most or all will say please do.I had mine for 15 years and sold it that way. My new A class has a manual plug in and out no noise with that.

Only possibility would be high or more likely low voltage. It is possible that a poor connection or missing ground to residential power.

4/17 second update. My pd52dcs transfer switch is noisy! They will send a new one. CW EMPLOYEE Thought it was my power source at home! Can that be true?

3/19 update: my batteries failed to keep a full charge with the old transfer switch. Of the four lights on the panel it always dropped to three quickly then two and finally one light. NOW with the new transfer switch it’s not only quieter but the four status lights stay on—day after day! Not sure why. In both cases the mh was unused. Perhaps the old transfer switch drew power out of the batteries just sitting?

MarkieBob wrote:
CW corrected the issue. A technician with 20 years experience fixed it. It does hum but tolerable—unlike the pd52. So we’ll see how it goes.....

A constant low volume hum. We'll see how it goes over time

MarkieBob wrote:
CW corrected the issue. A technician with 20 years experience fixed it. It does hum but tolerable—unlike the pd52. So we’ll see how it goes.....

A constant low volume hum. We'll see how it goes over time

CW corrected the issue. A technician with 20 years experience fixed it. It does hum but tolerable—unlike the pd52. So we’ll see how it goes.....

MarkieBob wrote:

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?

Tightening wire connections, only insures a good connection that won't get hot and cause crystallization of the wires and other current delivery problems.
Pull the relay contactors themselves and use emery cloth and a small file for cleaning the contacts and where the coils make contact, as well.
Had to believe they're all making noise or that they all are bad.
Check the little springs on the arms, while you're at it.
You can always replace one with a like model, if really faulty.
With re-reading the thread, it seems that the deed has been done, so you might as well ask for the old one back for having a looksee and for having a spare, if needed.