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Mixed Air Temperature Mode ............................................................................................... 26
MRT Control……. ............................................................................................................................................. 26
MRT-Expert Control .......................................................................................................................................... 26
MDT and MDT-Expert Controls........................................................................................................................ 26
Building Pressure Mode ........................................................................................................ 26
MRT and MDT Controls.................................................................................................................................... 26
MRT-Expert and MDT-Expert Controls ............................................................................................................ 26
100% Outside Air ................................................................................................................. 27
Minimum Ventilation ......................................................................................................... 27
Freezestat ............................................................................................................................... 27
Clogged Filter ........................................................................................................................ 27
User Configured PID Control ......................................................................................... 27
Direct Acting ............................................................................................................................ 28
Reverse Acting ....................................................................................................................... 29
Unit Resets ............................................................................................................................. 31
ALARM ..................................................................................................................................... 31
CALIBRATE ............................................................................................................................ 32
FAN COUNT ........................................................................................................................... 32
HEATING COUNT ................................................................................................................. 32
COOLING COUNT ................................................................................................................. 33
Multiplexed Inputs .............................................................................................................. 33
Clock Set ................................................................................................................................. 34
Diagnostics – Critical Alarm Codes ........................................................................... 34
ALARM CODE: Low Discharge Temperature ................................................................. 34
SOLUTION:
SOLUTION:
If burner was operating prior to shutdown (check prior alarm log) ..................................... 34
If burner was not operating prior to shutdown (check prior alarm log) ............................... 35
ALARM CODE: Safety Circuit Open................................................................................. 37
SOLUTION:
SOLUTION:
If fan is not running (check prior alarm log) ........................................................................ 37
If fan is running (check prior alarm log) .............................................................................. 37
ALARM CODE: Burner Status ........................................................................................... 38
SOLUTION:
Inspect burner control circuit and burner ............................................................................ 38
ALARM CODE: Burner Hand............................................................................................. 39
SOLUTION:
Inspect burner control circuit. This alarm has the potential to be a very serious problem.
Close the manual gas valves immediately if the fan is not running. .................................................................. 39
ALARM CODE: Flame Failure ........................................................................................... 40
SOLUTION:
Investigate flame relay ........................................................................................................ 40
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