T Therm Geo TST-***, Installation & Operating Instructions Manual

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12/03/2012
35 GI301
EARTH LOOP FLOW/SOURCE WATER LIMIT (Red LED)
ON Solid - No source flow lockout
Pulsing:
Open Loop - LWT < 'Open Loop, Source LWT Warning (Heat)'
Closed Loop - LWT < 'Closed Loop, Source LWT Warning (Heat)'.
If LWT is less than this value a shutdown with 2 x ACD’s (6 min) is performed
This will NOT cause a hard lockout; it is simply a warning and a pause in the system
for possible system correction or notification for further service action.
LO PRESSURE/LOW TEMP LIMIT (Red LED)
ON Solid - Low pressure lockout
Pulsing – Load side discharge temp. too cold.
Air - ST < 'Lo Press. Air ST Warning (Cool)'
If ST is less than this value a shutdown with 2 x ACD’s (6 min) is performed. This will
NOT cause a hard lockout; it is simply a warning and a pause in the system for possible
system correction or notification for further service action.
HI PRESSURE/HIGH TEMP LIMIT (Red LED)
ON Solid - High pressure lockout
Pulsing – Load side discharge temp. too hot.
Air - ST > 'Hi Press. Air ST Warning (Heat)'
If ST is greater than this value a shutdown with 2 x ACD’s (6 min) is performed. This
will NOT cause a hard lockout; it is simply a warning and a pause in the system for
possible system correction or notification for further service action.
HOT GAS/BLOWER FAILURE (Red LED)
ON Solid - CDT > 'Compressor Discharge Temperature Lockout
If CDT is greater than this value a soft lockout with 2 x ACD’s (6 min) is performed.
The 4th time this happens in the same heating or cooling cycle the unit will go into a hard
lockout.
Pulsing - Hard Lockout caused by ECM fault
(not used on the TST models)
ECM fault codes are read from ECM STATUS & ECM RPM LED’s on the inside of this board
(see information below)