Originally Posted by Todouble
Judging by the statement you've been out of the business for 20 years you must not be current on today's stats. I'm an hvac contractor and stats have changed tremendously since 1994. I understand everything your saying about jumping wires but any newer digital (not mercury old style) needs and R and C (24v) to power up the display. If you don't have the extra conductor in your current Tstat wire then you can use the batteries to power the digital thermostat! Guess what? When the batteries dies you lose your display and the thermostat will not function. I always stress hooking up the common wire providing it's there
You are probably right, I would never buy a stat that a battery is required to operate. I have a Honeywell/trane TCONT800. Just pulled the manual the only reason they state that I need 3 AAA battery's are for "arm chair programing" Then it says you can then remove the batteries if you want or leave them in. You see you are right there has been changes in the industry since I was in Business. Now your fan manufacturers and everyone else making stats like Hunter the fan people and everyone else that will buy there cheap stuff at any big box store. I prefer to stick to honeywell, Robertshaw, white rodgers. People save a dime here and spent 1000.00 for repairs. Thanks for your clarification. It's to bad about his water pipe, I wouldn't be a happy camper when I got home...
PS Mercury stats, I'm not that old that I only installed Mercury stats. They were gone a while before I retired.