Installation
I/O Wiring & Sequence
MSV127 – RT ECON
Economizer
The controller can be configured with the economizer option to take advantage of free cooling. The two Control Types of that can be
configured are Off-Auto or Modulating control.
Dry Bulb
The economizer is enabled to utilize free cooling when there is a call for cooling and the outside air temperature is less than the OAT
Econo Authorization setpoint.
When the control type is set to Off-Auto, and economizer is enabled, the output will energize the manufacturers equipment economizer
control.
When the control type is set for Modulating, the controller will modulate the outside air damper from minimum to 100% to maintain the
Minimum Supply Setpoint (55°F/13°C) at 100% demand call. When the demand call is 0%, the economizer will be set Off or Modulated
to maintain the Neutral Supply Setpoint (68°F/20°C). This sequence requires an Outdoor Air Sensor only and setting the OAT Econo
Authorization setpoint at a value higher than the OAT [ex. OAT Econo Authorization setpoint = 70 °F and OAT = 62 then Economizer will
operate] Setting the Economizer schedule, Econo control type and output location.
Enthalpy
If the calculated enthalpy is LESS than the enthalpy setpoint, the economizer will run in free cooling mode when it receives a call for
cooling and our sequence allows compressor operation during economizer mode which can be a way to save energy when we cool the
outdoor air instead of the return air. This sequence requires an Outdoor Air sensor, a Supply Air sensor, a Mixed Air sensor and a
Humidity sensor location in Econo Config and Control Sensor physical location in Hum and Dehumid Config. The OAT Econo
Authorization setpoint must be a value higher than the OAT [ex. OAT Econo Authorization setpoint = 70 °F and OAT = 62 then
Economizer will operate] Setting the Economizer schedule, Econo control type and output location to run the Enthalpy Economizer
sequence.
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