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LGH/LCH036, 048, 060, 072, 074
C-Zone Sensor
1-Economizer With Outdoor Air Suitable
Low Cooling Demand -
Compressor Off
Blower Variable
Dampers Modulate
High Cooling Demand -
Compressor Variable
Blower Variable
Dampers Full Open
Note - Compressor is energized after damper has been at
full open for three minutes.
Note - Free cooling is locked out when a dehumidification
demand is received. The unit operates in
dehumidification mode as if the outdoor air is not suitable.
2-No Economizer or Outdoor Air Not Suitable
Any Demand -
Compressor Variable
Blower Variable
Damper Minimum Position
D-Verify Proper Operation In Zone Sensor Mode
The Unit Controller (A55) communicates the appropriate
frequency (speed) to the compressor inverter (A192) to
match the cooling load. Because the cooling load varies,
the Unit Controller provides a test mode to initiate a
predictable compressor speed. Use the following Unit
Controller menu paths to change the compressor speed
and verify discharge and suction pressures are changing
appropriately. When the compressor speed increases,
the discharge pressure will increase proportionately and
the suction pressure will decrease proportionately. When
the compressor speed decreases, the discharge
pressure will decrease proportionately and the suction
pressure will increase proportionately.
036, 048, 060U
High speed compressor operation:
SERVICE > TEST > COOL > COOL 3
Intermediate speed compressor operation:
SERVICE > TEST > COOL > COOL 2
Low speed compressor operation
SERVICE > TEST > COOL > COOL 1
074U Only
High speed compressor operation:
SERVICE > TEST > COOL > COOL 4
First intermediate speed compressor operation:
SERVICE > TEST > COOL > COOL 3
Second intermediate speed compressor operation:
SERVICE > TEST > COOL > COOL 2
Low speed compressor operation
SERVICE > TEST > COOL > COOL 1
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