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HVAC Zone Controls hobbes 02-11-2008
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Posted by hobbes on February 11, 2008, 7:54 am
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.

Radiant Heat 468x60
Posted by Edwin Pawlowski on February 11, 2008, 10:23 am

>
> 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?

No. It should be able to run each independent of others.
The pwer failure may have tripped something or a su rge whent he power came
back on may have caused damage. I'd do some experimenting to see if each
will work on its own by turning the garage off and tu rnign each of hte oth
ers way up to see if they come one. If not, you need repairs.





Posted by RBM on February 11, 2008, 3:35 pm
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



> 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.



Posted by hobbes on February 11, 2008, 7:18 pm
> 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

Hi RBM,

Yes I think you ar right. It is a green box and it says TACO SR 504,
which is the controller. One more question if I may. If I went into
the garage and turned the thermostat setting to off (as opposed to
COOL-OFF-HEAT I have three settings). Would that mean the garage would
no longer call for heat. Therefore the priority would then switch to
one of the other heating zone circuits? Hence I could be toasty and
the cars would remain cold ... which is good :).

Best, Mike.


>
>
>
> > 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.


Posted by RBM on February 11, 2008, 8:21 pm
Turning the garage thermostat off or down, drops out it's relay and allows
all the other zones to function



> 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

Hi RBM,

Yes I think you ar right. It is a green box and it says TACO SR 504,
which is the controller. One more question if I may. If I went into
the garage and turned the thermostat setting to off (as opposed to
COOL-OFF-HEAT I have three settings). Would that mean the garage would
no longer call for heat. Therefore the priority would then switch to
one of the other heating zone circuits? Hence I could be toasty and
the cars would remain cold ... which is good :).

Best, Mike.


>
>
>
> > 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.



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