USING THE Z-600 WITH HEAT PUMPS AND DUAL FUEL EQUIPMENT
REVERSING VALVE:
Make sure that the heat pump thermostats and Z-600 reversing valve system switch are configured in the same
mode.
When the reversing valve is energized on a call for heating (B) or cooling (O), the O/B LED will be ON, The
reversing valve will remain energized until an opposite call takes place.
The zone thermostat auxiliary heat terminals are marked
. The HVAC System auxiliary heat terminal is
marked
. (See Typical Thermostat Wiring Diagrams)
When a zone thermostat calls for auxiliary heat in standard heat pump mode, the auxiliary heat cycles and the
heat pump compressor will be on at the same time.
When a zone thermostat calls for auxiliary heat in dual fuel (fossil fuel) mode, the heat pump compressor is locked
out and auxiliary heat (fossil fuel) becomes first stage until the heating call is satisfied.
When a zone thermostat calls for first stage heat in dual fuel (fossil fuel) mode and the outdoor temperature is
below the selected low balance point setting, the heat pump compressor is locked out and auxiliary heat (fossil
fuel) replaces heat pump operation. This feature does not apply for standard heat pump operation.
When a zone thermostat calls for auxiliary heat in standard heat pump mode and the outdoor temperature is
above the selected high balance point setting, the auxiliary heat will be locked out. This feature does not apply for
dual fuel (fossil fuel) operation.
In the event of a heat pump failure, only one zone thermostat needs to be placed in the Emergency Heat mode.
The Z-600 panel remembers the zone thermostat set in the Emergency Heat mode and treats all calls for heating
from any zone as an emergency heat call. The
LED will be ON to signify that an emergency heat call has
taken place. To reset the system back to standard heat pump operation, take the zone thermostat out of the
Emergency Heat mode. On the next call for heating the
LED will be OFF and the panel will resume normal
heat pump operation.
The 4 AMP PC board fuse is designed to protect the Z-600 panel, zone thermostats and zone dampers from a 24
Volt short. Replacement fuse should not exceed 4 AMPS.
The two, RC and RH 2 AMP system fuses are designed to protect the Z-600 panel from a 24 Volt HVAC
equipment short. A 2 AMP spare fuse is located on the panel. However, replacement fuses should not exceed 3
AMPS.
O = Reversing valve energized on a call for cooling
B = Reversing valve energized on a call for heating
HEAT PUMP AUXILIARY HEAT WIRING:
W3/AUX
W3/AUX/EH
THERMOSTAT CONTROL OF AUXILIARY HEAT:
BALANCE POINT CONTROL:
Low Balance Point
High Balance Point
EMERGENCY HEAT:
EMHT
EMHT
PANEL FUSES:
4 AMP PC Board Fuse
2 AMP System Fuses
5418 Elmwood Avenue, Indianapolis, IN 46203-6025
Toll Free: 888.652.9663 Fax: 317.227.1034
www.jacksonsystems.com
07-1091-031511
SYSTEMS
