[DK on the road]

(Hi, Have you removed and checked every glass fuse? as posted before they can look good but test them, every one.)

Ian, I disconnected all the power from the transformer and I got 24vdc on the output side. As I added each wire and increased the load, the voltage dropped, all the way to 9.2vdc with all wires reconnected. So I was getting draw thru the fuses and not blowing them. Once I replaced the transformer, I maintained the 24vdc and again all components worked as designed and didn't blow a fuse.

Electronics are not my strong point, but I'm hoping I'm going following good practices at diagnosing and repairing. But I'm always appreciative of fellow Guru's input

It has been together now about a week and not seeing a problem. 

BTW 
Item Code Description Price (US $) /
Quantity Total (US $)
PSC-24-060 Small
PSC-24-060 RHINO SELECT PSC series switching power supply, 24-28 VDC output, 2.5A, 60W, 120/240 VAC nominal input, 1-phase, enclosed, plastic housing, 35mm DIN rail mount, screw terminals, NEC Class 2.
$75.00
Qty: 1
$75.00

looks to be a direct replacement for the Siemens 24VDC transformer for 1/3 the money.  It mounts the same and has all the same specifications. Vs the temporary unit I purchased, which has the proper specifications but configured differently and will not mount like factory behind the "Electronic room control" panel.