What you will probably find is that there is a control panel mounted on or
near the boiler. It probably says Taco and is green, or Argo and is black.
This encloses the relays that control the circulators for each zone. These
units are designed to use a "priority" relay for a domestic hot water
indirect tank. It's purpose is to kill all other zones until the hot water
maker is satisfied. My guess is that your garage is connected to this
"priority zone". If so, open the control box and find the priority switch
and turn it to off, it will be clearly marked



"hobbes" wrote in message
...
Hi,

We have a three zone Hydro / Hot air HVAC system for heating.

Zone 1: Garage
Zone 2: Downstairs
Zone 3: Upstairs

The control system pumps hot water to three seperate Air Handlers that
then supply hot air for heating.

After a power outtage, when the system came back on. All the hot water
went to Zone one the garage circuit. After the garage was warmed up,
then the rest of the house was supplied.

Is it usual for such a HVAC system to only supply one Zone at a time
with hot water because of the amount of hot water required?

If so would turning off the Garage circuit, by setting the Thermostat
to OFF, make the other hot water circuits become active?

I was sort of cold, while my cars were getting toasty. Sort of silly
really. Just wondering how I could avoid this ....

Best, Mike.