Mercury PR0091 manual Over-ride Operation, Thermostat Over-ride

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Mercury 6-5 Stat – Installation & User Guide

Over-ride Operation

The 5 Channel Thermostat can operate either from its internal channel time settings or from a network Data Manager GP Timer channel (P70 sets the mode either local or remote). If the 5 Channel Thermostat is set up to use the remote timing channels it reverts to local mode if network communications are lost for more than 5 minutes. An over-ride occurs when a resistor is switched in across the input which has to be overridden, however when the over-ride signal is removed the channel returns too normal operation.

Thermostat Over-ride: -

When a channel is configured for thermostat operation the following will occur when an over-ride is present on the channel input. In the example below channel 1 is set as a thermostat in a heating application, the relay inverse feature is disabled, the controller timer is set to local operation and is off. When the timer is in the off period the channel will not be enabled for heating and the thermostat relay remains off, providing the probe temperature is not below the frost detect set point. As shown in the diagram an over-ride is applied to channel 1, this will enable the channel. The thermostat relay does not immediately turn on, it only does so when the temperature drops below the cut-in set point. The controller will continue normal temperature control until the over-ride is removed or the next scheduled off occurs in the local timer schedule. When the timer is in the on period, the over-ride has no effect. Note:- An over-ride should be removed as soon as it is not required on an input.

Over-ride

Activated

 

Diff

 

 

Temperature

Cut-in Set

 

Relay State

Point

On

Frost

Off

 

Detect

 

 

 

 

Time

 

Thermostat Relay Status

Ch 1 Probe Temperature

Ensure that all power is

 

 

switched off before

 

 

installing or maintaining

 

 

this product

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Contents Mercury Channel Thermostat Installation Guide Table of Contents Display value Type M Channel Thermostat Network ConfigurationFrom Resource Data Management DescriptionDo not connect an earth Input/Output Allocation Tables Ch Thermostat Description Alarm Action Switched ResistorConnections Set-up Function Menu Display Option Explained in Paragraph Setting up the controllerSet-up Mode Set-up through front buttons Type. view controller type Recommended set-up methodRevision Mercury 6-5 Stat Installation & User Guide Units and Probe Type Probe FaultIP-r Network ConfigurationIP Futura module Thermostat Over-ride Over-ride OperationInvert Channel TimerNormal Operation Frost DetectCooling Thermostat graph Heating Thermostat graph Thermostat Cooling/Heating OperationDisplay System status ViewingDisplay Messages GP Timer Set-up Network AlarmsAlarm text Type Relays Specification General Power requirementsInputs Clearances Panel Cut-outFixing Over-ride input Resistors WiringFuse CleaningRevision History

PR0091 specifications

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