Comfort System
Installation Instructions for Z-300-HC Zone Control Panel
Heat / Cool Auto Changeover - Cooling Priority
Zone Control Made Simple™
5418 Elmwood Avenue, Indianapolis, IN 46203-6025
Toll Free: 888.652.9663 Fax: 317.227.1034
www.jacksonsystems.com
06-1015-021507
Sequence of Operation:
Thermostats:
Comfort System™ is a residential / light commercial zone
control system that allows a single HVAC unit to have up to
three separate zones (nine if three panels are connected
together). Each zone is controlled by its own space
thermostat and motorized zone damper. If any of the zone
thermostats call for heating or cooling, the zones not
calling will have their dampers powered closed, and the
zone(s) calling will have its (their) damper(s) remain open.
The heating or cooling equipment will also be brought on
at the same time. When all zone thermostats are satisfied,
the heating or cooling equipment turns off and all zone
dampers return to the open position to allow for continuous
air circulation.
If one of the zone thermostats is calling for heating and
another zone thermostat is calling for cooling, the cooling
thermostat will take priority and the system will operate in
the cooling mode. When the thermostat that is calling for
cooling is satisfied, the system will change over and take
care of the heating requirement. This is referred to as Auto
Changeover - Cooling Priority
The zone control system works with standard, single-
stage, heat / cool thermostats. The thermostats can be
either manual or auto changeover.
Verify that all wires have been connected to the proper
terminals and are secure.
Verify that the jumpers across the ‘LL’ and ‘HL’ terminals
were removed before connecting the high and low limits.
The low limit (FS-38) should be wired to the ‘LL’ terminals
on the zone control panel. The high limit (HL-170) should
be wired to the ‘HL’ terminals on the zone control panel.
Zone dampers are powered closed and spring return
open. There will be no power on the panel damper
terminals marked ‘D’ and ‘D’ when the damper is in the
open position.
ZONE DAMPER 2
MIGHT SERVE
BEDROOM AREA
ZONE DAMPER 1
MIGHT SERVE
LIVING AREA
ZONE 1
STAT
ZONE 2
STAT
COMFORT SYSTEM™
PANEL
24 VOLT 40VA
TRANSFORMER
FURNACE
Typical System Layout
When a green zone LED is on, the zone is calling for
heating or cooling.
To check the system for proper operation, pull the
disconnect for the condensing unit to prevent short
cycling. Next, place all the zone thermostat mode
switches in heat mode and turn down all thermostat set
points. Go to each zone thermostat, one at a time, and
call for heat to verify that the proper zone dampers are
open (and the rest are closed). Turn the zone
thermostat back down before checking the next zone.
System Checkout
TM
