6
BASIC OPERATION OF YOUR ZONED COMFORT CONTROL SYSTEM
Your Aprilaire Zoned Comfort System will allow you to increase your comfort by directing conditioned air to separate areas
(zones) based upon each zones thermostat setting. To operate the system, just set or program each zones thermostat to your
desired comfort and set-back settings.
When there is a heating or cooling call from any zone, the appropriate heating or cooling equipment will be turned on. The
dampers in 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.
Aprilaire Zoned Comfort Control is a heat call priority system. This means that there are certain times when heating calls will
take precedence over cooling calls. This occurs if two calls for opposing modes exist simultaneously while the system is idle, in
which case the heat call will be satisfied first. In all other cases a first-call, first-serve approach is taken satisfying the zone(s)
that call first. If, however, a call for opposing mode exists for a minimum of 20 minutes during equipment operation, the system
with shut down for an equipment protection minimum off time then changeover to satisfy the new call. The heating and cooling
equipment will not operate at the same time.
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 as well as how your Aprilaire
Intelligent Zoned Comfort Control System can control the other pieces of your HVAC system.
HVAC CONTROL DETAILS
HEATING OPERATION (ALL MODELS OF EQUIPMENT)
To start heating:
1. Set your Model 8570 programmable thermostat to the Heat mode. This is accomplished by selecting HEAT from the
Mode Menu. Consult the Model 8570 Owner’s Manual for details.
2. Adjust the thermostat set point to a temperature higher than the displayed room temperature, using the Up button, so that
a Heat call is initiated. Again, consult your thermostat Owner’s Manual for details on how to do this properly.
The LED labeled “HEAT”, 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.
71
˚
INFO
MENU
20
˚
OUTDOOR
03/31/04 8:32 AM
FAN AUTO
OFF
MAIN MENU
SET DATE AND TIME
HOLD
PROGRAM
FAN
SETTINGS
MODE - HEAT/COOL/ETC.
EXIT
SELECT
MODE MENU
OFF
AUTO
COOL
EMERGENCY HEAT
HEAT
BACK
SELECT
71
˚
INFO
MENU
20
˚
OUTDOOR
03/31/04 8:32 AM
HEAT 70
SETPOINT
FAN AUTO
HEAT MODE
68
˚
RESUME
PROG.
MENU
20
˚
OUTDOOR
HOLD TIL 4:00PM
HEAT 72
SETPOINT
HEATING
FAN ON
68
˚
INFO
MENU
20
˚
OUTDOOR
03/31/04 8:32 AM
HEAT 68
SETPOINT
FAN AUTO
HEAT MODE
72
˚
HOLD THIS
TEMPERATURE
UNTIL 4:00PM
HEAT
BACK
SAVE
