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The ED-3 panel can control a standard A/C or a heat pump; but if the system includes a heat pump, a heat pump thermostat must be installed on zone 1. 

2 to 3 zone system, 1 or 2 stage heating, 1 stage cooling.

Auto change-over panel
(Auto change-over thermostats are required for an automatic change-over system).

 

2 to 3 Zones
ED-3 Complete System Example
Quantity Description
1 ED-3 panel
1 / Zone Thermostat, (see chart below)
1 Pressure relief damper
1 / Zone Zone damper
1 PT-40 Transformer, (4 DuroZone zone dampers maximum)

* Compatible with most 24VAC powered or battery powered thermostats.

ED-3 DuroZone Thermostats (non auto change-over)

Zones System NOT including a heat pump System INCLUDING a heat pump
Zone - 1 DT-4 #35190
digital, non programmable thermostat
DT-3 #35191
digital, programmable thermostat
DT-5 #35162
digital, non programmable thermostat
DT-7 #35161
digital, programmable thermostat

Zones 2 and 3:
One Thermostat
Per Zone

DT-4 #35190
digital, non programmable thermostat
DT-3 #35191
digital, programmable thermostat
DT-4 #35190
digital, non programmable thermostat
DT-3 #35191
digital, programmable thermostat

DUROZONE ZONE DAMPERS A maximum of 2 dampers per zone can be connected directly to any zone.
TRANSFORMER Model PT-40, Item #35054, can supply a maximum of 4 DuroZone zone dampers.
Instructions and Typical Wiring Diagrams for DuroZone ED-3

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