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Zoning Control Settings (iHarmony
®
Zoning System)
NOTE - Skip if no zoning control device is installed.
HEAT/COOL CHANGEOVER
The following is an example of how the system operates
during a heating / cooling changeover.
When the system is satisfying a call from zone 1 for heating
and receives a call for cooling from zone 2, the following will
occur:
Then system will continue to fulfill the demand from zone
1 until satisfied, or a maximum time of 20 minutes has
occurred.
If after 20 minutes the system is still operating based on
satisfying the heating demand from zone 1, the system
will terminate that demand.
The system will shut system down for five (5) minutes.
This will allow for system temperatures and operating
pressures to stabilize.
After a five minute delay the system will begin operations
to satisfied the cooling demand from zone 2.
The system will continue to operate in this matter each time it
receives a zone call that is opposite of the current mode of
operation (heating or cooling).
DAMPER OPERATION
Cooling Operation Conventional Heat/Cool and Heat
Pump Systems
When a in-zone thermostat makes a demand for cooling, the
zone damper opens and the cooling equipment begins
operating. Dampers will closed for any zone with no cooling
demand.
Cooling demand is terminated when:
1. All zone demands for cooling are terminated.
2. The demand has exceeded the heat/cool changeover
time limit (20minutes) while a heat demand exists.
When cooling demand is terminated, a 5 minute minimum off
time delay is initiated.
Second stage cooling is energized when the discharge air
temperature is 7°F higher than the set point of the cooling
staging temperature.
Heating Operation Conventional Heat/Cool and Heat
Pump Systems
When a in-zone thermostat makes a demand for heating, the
zone damper opens and heating equipment begins operating.
Dampers will closed for any zone with no heating demand.
Heating demand is terminated when:
1. All zone demands for heating are terminated.
2. The demand has exceeded the heat/cool changeover
time limit (20minutes) while a cooling demand exists.
When heating demand is terminated, a 5minute minimum off
time delay is initiated.
Second-stage heating is energized if the discharge air
temperature is lower than the set point of the heating staging
temperature set point.
Under system devices use the following procedures to adjust
various zoning control parameters (a complete list of all
available parameters are listed starting on page 8).
ZONE CONTROL (ADJUSTING SYSTEM DEVICES)
System Devices > System
A complete list of available zoning parameters un
der System is provided in table 2 on page 8.
1. In the system devices screen, use the arrows
(A) to highlight System and press edit (B).
2. Touch one of the options (C) to select for ex
ample Zoning Target Supply Air Temp for
Cooling Press edit (D) to continue.
3. Use up or down arrows (E) to change the
value.
4. Press save (F).
system devices
To adjust a setting,
highlight it, then press
Edit
furnace
about
System
Furnace
Thermostat
2 Stage HP Unit
Zoning Control
reset All
edit
System
Equipment Name
Zoning Target Supply Air Temp C
Zoning Target Supply Air Temp fo
Zoning Target Supply Air Temper
Zoning Target Supply Air Temper
Zoning Supply Air Temp Limit for
Zoning Supply Air Temp Limit for
HP heating lockout time
Zoning Target Supply Air temp for
Cooling
1
current value:
edit
Zoning Target Supply Air Temp
for Cooling
set-to
45 F
cancelsave
C
E
F
reset
9:39 am Aug 15, 2012
A
B
D
Range is 45 to 60 F
Default is 45, inc: 1
Figure 19. Adjusting System Devices > System Parameters for iHarmony
®
Zoning System
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