Mercury PR0091 User Manual

 

Mercury 6-5 Stat – Installation & User Guide

 
Normal Operation 
 
During normal operation, the controller will display "on". If the 5 Channel Thermostat is on a network and on-
line, the green network LED will be on. If any alarms are generated the red LED will light. The yellow LED has 
no function and will not light. 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Frost Detect 
 
The frost detect parameter is used to provide heating in an instance where the timer status is off. Each 
thermostat channel has its own frost detect value that can be configured. Once the temperature drops below 
the frost detect value the controller channel will heat to the frost detect value plus the channels diff parameter. 
For example the 5 Channel Thermostat is used to heat a room, the channel configured has a diff of 5

o

C, a 

frost detect value of 0

o

C and the timer is off. The channel will switch its associated relay on when the 

temperature drops below 0

o

C. The room will begin to heat and the relay is on, it will stay on until the 

temperature rises above 5

o

C. At this point the relay will be turned off. The relay will be turned on again if the 

room temperature drops below 0

o

C. 

 
Invert 
 
The 5 Channel Thermostat has a channel setting to invert the output, if this option is used, the output is off 
when the timer is on and the output is on when the timer is off. 
 
Network 
 
The Network green LED flashes if the controller goes off-line. 
 
Probe Offset 
 
Each probe can be offset by up to ±10 

o

C to compensate for long cable runs. 

 
Channel Off 
 
It is possible to turn channels off if they are not in use. 
 
Channel Timer 
 
It is possible to use each channel as a timer. The channel will follow the controller’s internal timer schedule or 
a remote GP timer for on and off times.

 

 
 
 

  

Revision 1.2 

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