What should I set a thermostat’s System Type to?
System Type changes when or why the Pelican thermostat's enables its outputs.
Conventional HVAC Units:
Conventional air conditioners generally have separate cooling sources from their heating sources. For this reason, conventional air conditions are often packages of one or multiple compressors, chilled water valves and a gas furnaces, electric heating elements, or a hot water/steam valve.
Setting a Pelican thermostat to Conventional tells the thermostat that the units will respond to conventional thermostat signals.
Signal Outputs from Conventional Thermostats:
(G) = Supply Fan Enable
(Y) = Stage 1 Cooling Enable
(W) = Stage 2 Heating Enable
(Y2) = Stages 2 Cooling Enable
(W2) = Stage 2 Heating Enable
Heat Pump HVAC Units:
Heat Pump air conditioners generally have a shared cooling and heating sources. This is normally one or multiple compressors with a reversing valve which is used to reverse the refrigerant flow to either produce hot or cold air. Heat Pumps generally perform very well in mild winter climates, but in areas where it can get extremely cold, an Auxiliary/Secondary heating source is usually added to the Heat Pump to provide additional heating capabilities.
Heat Pumps are most commonly “Air Source”, “Geothermal”, or Ductless/Mini-Split type units. Sometimes Heat Pump units respond to “Conventional” thermostat outputs. Confirm that with your Heat Pump installation guide on if the thermostat should be configured as Conventional or Heat Pump.
Setting a Pelican thermostat to Heat Pump tells the thermostat that the units will respond to heat pump thermostat signals.
Signal Outputs from Heat Pump Thermostats:
(G) = Supply Fan Enable
(Y) = Stage 1 Compressor Enable
(W) = Reversing Valve
(Y2) = Stages 2 Compressor Enable
(W2) = Stage 2 Auxiliary/Secondary/Emergency Heat Enable
Note on some Heat Pump Units:
Some Heat Pump units respond to Conventional thermostat inputs. Review your Heat Pump’s installation guide for the correct configurations.
The following configurations are only available if there is a Pelican Zone Controller (Z8 or Z24) part of your Pelican Solution:
Single Duct Damper
Setting a Pelican thermostat to Single Duct Damper tells the thermostat that it is controlling a zone damper actuator. This is common for VVT, VAV, and Mixing Box applications.
Signal Outputs from Single Duct Damper Thermostats:
(G) = Unused*
(Y) = Damper Open
(W) = Reheat Valve Open**
(Y2) = Damper Close***
(W2) = Reheat Valve Close**
*This output is only used for Parallel or Series Fan Powered Boxes and requires proper Damper Type and Fan Control configurations.
**These outputs are only used if the zone box has reheat.
***This output is only used if the thermostat is controlling a Power-Open/Power-Close or Floating damper actuator.
Dual Duct Damper
Setting a Pelican thermostat to Dual Duct Damper tells the thermostat that it is controlling two separate zone damper actuators. One actuator open and closes the cold deck. The second actuator open and closes the hot deck.
Signal Outputs from Single Duct Damper Thermostats:
(G) = Unused
(Y) = Cold Deck Damper Open
(W) = Hot Deck Damper Open
(Y2) = Clod Deck Damper Close
(W2) = Hot Deck Damper Close
Note: This configuration is only used for true Dual Duct mechanical system where there are separate actuators for the cold and hot decks. For mixing box applications, where there is one actuator for both the cold and hot decks, set the thermostat’s System Type to Single Duct Damper.