Clare Controls CH-THSTAT-W Operation Manual - Page 5

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Thermostat Operation

Minimum Run Time (MRT)

The thermostat has a Minimum Run Time after the start of any heating or cooling call. This

minimum run time assures even heating and cooling cycles. The MRT delay will keep the

system on even if reaches setpoint or you change the setpoint to a temperature that would

satisfy the call, until the MRT expires. Changing the Mode to OFF will cancel the MRT and

the system will turn off immediately. The MRT can be adjusted in the Installer Settings

menu of the thermostat.

Note: The MRT status is shown in the thermostat System Status on-screen labels.

Minimum Off Time (MOT)

The thermostat has a Minimum Off Time after any heating or cooling call is finished. This

delay prevents rapid heating/cooling cycles and also provides "short cycle protection" for

compressor calls. This delay may be noticeable when you change a setpoint and it does

not respond immediately due to another call that has recently completed and the MOT

delay timer is preventing the system from restarting. The MOT delay time can be adjusted

in the Installer Settings menu of the thermostat. There is a minimum of 5 minutes delay to

assure compressor protection.

Note: The MOT status is shown in the thermostat System Status on-screen labels.

Doc ID 2014-05-223 • Rev 02

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