Lennox Zoning System LZP-4 User manual

Lennox
HVAC Zone Control
Model LZP-4
Owner’s Manual
504, 929M

Overview
The Lennox LZP-4 Zone Control System has been
designed to increase comfort in your home. It’s able to do this
because it solves the problem caused by various areas of the
home gaining and losing heat at different rates. Unlike
conventional heating and air conditioning systems, the LZP-4
Zone Control knows, at any given time, which areas (zones) of
your home require conditioned air. With this information, the
Zone Control automatically directs the conditioned air to the
zones that require it. Because of this, you will be able to
increase the comfort level throughout the home.
The components that make up the Zone Control System
are: thermostats, a Control Panel, air control dampers and
heating and cooling equipment, as shown in the illustration
below. The Control Panel is typically located on an inside wall
near your heating and air conditioning equipment. The dampers
are located inside your air ducts in such a way that each zone
can be independently controlled. Thermostats, placed in each
zone, are directly connected to the Control Panel.
The above illustration shows a system where three of the four
zones are used.
Zone 1
68˚F (20˚C)
Zone 2
70˚F (21˚C)
Zone 3
65˚F (18˚C)

Model LZP-4
The Model LZP-4 is designed to work with your heating and
cooling system, whether it is a furnace and air conditioner, heat
pump with electric backup heat, or a heat pump with a gas
furnace.This model can handle three stages of heat (two stage
compressor, one auxiliary heat) and two stages of cool. The LZP-
4 will control 2, 3 or 4 zones.
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.
There are two possible control modes that your Lennox Zone
Control System can be programmed for. Your Lennox dealer
programs the control panel at the time of installation to either “any
zone sets mode” or “zone 1 sets mode”. When configured for
“any zone sets mode” operation each thermostat can control the
equipment’s changeover from heating to cooling or vice verse.
When configured for, “zone 1 sets mode”, only the zone 1
thermostat can effect the equipment's changeover. For instance,
if Zone 1 is set to the cooling mode, only calls for cooling will be
accepted, and if Zone 1 is set to the heating mode, only calls for
heat will be accepted. It is important to know which control
strategy has been designed into your system, since it will affect
its operation.
Ask you installer to circle which control mode the LZP-4 Zone
control panel has been set for: Zone 1 sets the mode, Any zone
sets the mode.
There is a 20 minute change over feature which provides a
maximum call time of 20 minutes if opposing calls exist. The
heating and cooling equipment will not operate at the same time
when the panel is set to any zone sets the mode.
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, Cooling,
and Emergency Heat 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.
An LED labeled ‘Heating’, on the zone panel enclosure will
indicate if the board is making a call for heat. 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 heating cycle
before it can come on again. This built in feature ensures that
the heating equipment does not cycle too frequently, shortening
the life of the equipment.
Cooling Operation
1. 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.
An LED Labeled ‘Cooling’, on the zone panel enclosure will
indicate if the board is making a call for cooling. 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.

Emergency Heat Operation
(Heat Pump Equipment only)
There are two options available for operation of Emergency Heat.
The option used with your system is dependent upon the initial
installation performed by your installer. Ask you installer to circle
which option your LZP-4 Zone control panel has been set for.
Option 1- If heat pump thermostats were installed in all zones,
they are equipped with an Emergency Heat setting that can
initiate the emergency heat mode. This is accomplished by
moving the thermostat mode selector switch or push button until
the Emergency Heat mode is chosen. Then, by placing the
thermostat’s set point above the current temperature, Emergency
Heat will energize until the thermostat is satisfied. If any other
zone should call for heat during the Emergency Heat call, it too
will be satisfied by the Emergency Heat source.
Option 2- If Heat/Cool (non heat pump) thermostats were
installed in all zones, Emergency Heat can only be accessed by
setting the Emergency Heat switch, located on the Zone Control
Panel, to the ON position. Then, by placing any thermostat’s set
point above the current temperature while in the heat mode,
Emergency Heat will energize until the thermostat is satisfied.
The accompanying ‘E- Heat’ LED on the control panel enclosure
signifies you are in Emergency Heat mode.
With this option the system will stay in the emergency heat mode
until this switch is turned to off.
Note: Emergency Heat is generally much more expensive to
operate than the Heat Pump. Use only when necessary. Your
equipment may not include Emergency Heat.
Damper Operation
When the Lennox Zone LZP-4 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 cycle, all dampers open.
An LED on the zone panel enclosure will indicate if the damper
for a zone is closed. The LED’s labeled Z1 through Z4 Damper,
indicate a closed damper in Zone 1, Zone 2, Zone 3, and Zone 4
respectively.

Fan Operation
The Lennox Control Panel allows you to control fan operation
from any zone. Dampers in zones not calling for fan will close. If
continuous fan operation is desired in all zones, the fan must be
turned on at the thermostat in each zone. An LED labeled “Fan
On”, on the zone panel enclosure will indicate if the HVAC fan is
on.
Turning the System Off
In order to shut off the system and prevent the 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 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. Then move the ‘Vacation’ Switch, located on
the Zone Control panel, to the ‘On’ position. The system will then
be controlled by the Zone 1 thermostat only. This prevents having
to adjust all thermostats twice, when leaving and upon return. 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 LZP-4 Zone Control System is properly
installed, there is no maintenance required to the control panel
components. Standard heating and cooling equipment
maintenance is required.
If you have a problem turning on either heating or cooling, it may
simply be a normal built in time delay.

10006275
B2203473 Printed in U.S.A.