Lennox International Inc Air Conditioner HVAC Zone Control User Manual

Lennox  
HVAC Zone Control  
Model LZP-2  
Owner’s Manual  
504,928M  
 
The Model LPZ-2 was designed to work with your single-  
stage or self-staging heat/cool equipment (for example a  
furnace and an air conditioner).  
Basic Operation  
Your Zone Control System will allow you to increase your  
comfort by directing conditioned air to separate areas (zones)  
based  
on  
each  
zone’s  
thermostat  
setting.  
To operate this system, just set or program each zone’s  
thermostat to your desired comfort set points. When there is a  
heating or cooling call from any zone, the appropriate heating  
or cooling equipment will be turned on. The dampers to zones  
not requiring heating or cooling will close and the conditioned  
air will be directed to the calling zone (s) until the thermostat  
is satisfied.  
Your zone control system is designed to direct conditioned air  
only to the rooms served by that zone’s thermostat. However,  
due to the open design of today’s homes, it may not be  
possible to maintain drastic temperature differences between  
zones. Closing interior doors is a good way to reduce the air  
exchange between zones and increase the temperature  
difference between them.  
The following sections describe how to make Heating and  
Cooling calls.  
Heating Operation  
To start heating:  
1. Set your thermostat to the Heat mode. Depending on the  
thermostat, this is accomplished by either manually moving  
a switch to the Heat position or digitally selecting Heat  
mode with a push button. Consult your thermostat Owner’s  
Manual for details.  
2. Adjust the thermostat set point to a temperature higher than  
the displayed room temperature so that a Heat call is  
initiated. Again, consult your thermostat Owner’s Manual  
for details on how to do this properly.  
When you have correctly initiated a Heat call, the Lennox  
LPZ-2 Zone Control Panel will start your heating equipment. If  
the equipment does not come on right away it may be due to  
 
the minimum-off time delay. Four minutes must elapse after  
the last furnace cycle before it can come on again. This built  
in feature ensures that the furnace does not cycle too  
frequently, which can reduce the life of your furnace.  
Cooling Operation  
1. To start cooling: Set your thermostat to the Cool mode.  
Depending on the thermostat, this is accomplished by  
either manually moving a switch to the Cool position or  
digitally selecting Cool mode with a push button. Consult  
your thermostat Owner’s Manual for details.  
2. Adjust the thermostat set point to a temperature lower than  
the displayed room temperature so that a Cool call is  
initiated. Again, consult your thermostat Owner’s Manual  
for details on how to do this properly.  
When you have correctly initiated a Cooling call, the Lennox  
LPZ-2 Zone Control Panel will start your cooling equipment.  
If your air conditioning does not come on right away it may be  
due to the minimum-off time delay. Four minutes must elapse  
after the last air conditioner cycle before it can come on  
again. This built-in feature ensures that the air conditioner  
does not cycle too frequently, which can reduce the life of  
your equipment.  
Damper Operation  
When the Lennox Zone Control Panel receives a call and  
turns on the appropriate equipment, it also automatically  
closes the dampers that serve the non-calling zones and  
opens those in the calling zones. When all calls are satisfied,  
the Control Panel initiates a purge cycle during which time the  
dampers maintain their last position. After this purge all  
dampers open.  
Fan Operation  
The Model LZP-2 Lennox Control Panel allows you to control  
fan operation from any zone. Dampers in zones not calling for  
fan will close. If continous fan operation is desired in all zones,  
the fan must be turned on at the thermostat in both zones.  
 
Turning the System Off (All Models)  
In order to shut off the system and prevent the Lennox  
LPZ-2 Zone Control Panel from turning on your equipment,  
you need to set ALL of your thermostats to the OFF mode.  
Depending on your thermostats, this is done manually with a  
slide switch on your thermostat’s sub-base or with a digital push  
button. Consult the Owner’s Manual for your particular  
thermostat.  
If leaving the home for a long period of time, set the  
thermostats to the Heat mode and adjust the set point to a  
temperature that will prevent freezing in all areas of the home.  
It is not recommended to turn off all thermostats for extended  
periods in climates where freezing temperatures may occur.  
Thermostat Replacement  
Not all thermostats will work for all systems. If you need to  
replace a thermostat, call the Lennox dealer that installed your  
system. Certain types of thermostats, known as power  
robbing thermostats, could cause unintended operation and  
should never be used. You can tell if a thermostat is power  
robbing by looking to see if it does not have a wire connection  
terminal labeled C (common). Power robbing thermostats do  
not have a C terminal. Only thermostats with a C terminal  
should be installed.  
Maintenance  
Once your Lennox Zone Control System is properly installed,  
there is no maintenance required to the control panel  
components. Standard heating and cooling equipment  
maintenance is required.  
 
 
 
10006260  
B2203459  
 

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