Dual Zone heating problem - HELP!

[wolven]

Hi everyone,

Hope someone can help me out with dual zone heating problem.

Just got a new house with Lennox G43UF furnace and LZP-2 control panel.
There are 2 zones, 1 in the basement the other controls main/upper floor.
It appears that the basement controls don’t work properly.

Example.

Main level temperature 22C, set thermostat to 20C following a schedule.
Basement temperature 18C, set thermostat to 21C.

Possible outcomes:
- Basement zone doesn’t turn on (normal outcome)
- Basement zone turns on briefly and goes off
- Basement zone turns the upper floor vents (happened once for sure)

In order to get the Basement heating going I must set Main level to 23C then the Basement vents kick in as well, when the Main level reaches the 23C then basement goes off too.
In the Basement sometimes when I switch commands the Honeywell thermostat doesn’t click.
I can control Main level without turning on the Basement as well.

I called a technician and they said it is the control panel.
Not sure yet how expensive that is.
I'm to call them tomorrow

I have noticed that control panel receives signal. The normal operating green light is on and the red light turns on by zone 1 (Basement). Things start clicking and signals go out to another box which seems to move probably dampers or whatever it is, yet the furnace doesn’t turn on.

Any solutions or testing suggestions would be greatly appreciated.
Keep in mind I have no clue about any of this.

Thanks!

[genduct]

It seems that if the basement "calls for heat" and the main floor is shut off then the unit would quickly overheat from low airflow and continue to go off on high temp.

It sounds like your system design is flawed, not a "board problem"

Do you have a bypass damper? iof you do my suspicions would be verified

[wolven]

It seems that if the basement "calls for heat" and the main floor is shut off then the unit would quickly overheat from low airflow and continue to go off on high temp.

It sounds like your system design is flawed, not a "board problem"

Do you have a bypass damper? iof you do my suspicions would be verified

Thanks for response.
Yes, it looks like I have a manual bypass. Seems to pump more air downstairs when opened. So, a design problem, hmm, one would think the developer would know better.

Is there a way to increase the air flow?

[genduct]

Thanks for response.
Yes, it looks like I have a manual bypass. Seems to pump more air downstairs when opened. So, a design problem, hmm, one would think the developer would know better.

Is there a way to increase the air flow?

A bypass damper connects the supply and return to shift some of the "excess" air when only one area ( the small basement load for instance) calls for heating or cooling. This is not to be confused with BALANCE Dampers that will adjust the flow to and area

[wolven]

A bypass damper connects the supply and return to shift some of the "excess" air when only one area ( the small basement load for instance) calls for heating or cooling. This is not to be confused with BALANCE Dampers that will adjust the flow to and area

Not sure, I will take a look around. Yesterday, we spent a few hours trying to figure out all the cables, making progress. :) Thanks

[beenthere]

From what you described. If the tech reads the manual for that panel, he should be able to figure out what sensor is not working right. It has a built in safety that is causing what you describe.