Data Aire gForce Ultra User Manual page 111

Monitor the variable speed compressor's suction temperature using EVD drive
communication. Add compressor high suction temperature alarm limits and default to
85 o F (the range is 80 to 95
When C1 has been running for 3 minutes and suction temperature is higher than

the setpoint, generate a "C1 high suction temperature" alarm
Shut down the C1 compressor during high suction temperature alarm. Alarm will

automatically reset if suction temperature falls below the high suction
temperature alarm limit minus the deadband and the variable speed compressor
resumes operation if high suction temperature alarm has been cleared for 5
minutes.
Add an alarm message to dap4™ display to notify the end-user that compressors

lock-out are delayed by high suction temperature alarm time-out during this 5
minutes time-out.
Add this alarm to alarm contacts list and BMS list.

Add lock-out logic with adjustable allowable reset times. If the compressor reset

times equal the programmable reset times then the compressor is locked out until
it is manually reset. Add an additional menu in Alarm & Limit group to reset this
lock-out.
Monitor the variable speed compressor's suction pressure using EVD drive
communication.
Add the variable speed compressors' low suction pressure cut-out setpoint at 90

psi (range is 85 to 110 psi) and suction pressure deadband at 5 psi (range from 1
to 10 psi).
Shut the compressor down and generate a low suction pressure alarm message

when suction pressure drops below the low suction pressure setpoint and C1 has
been running for 3 minutes. The variable speed compressor will automatically
cycle on when its suction pressure rises above cut-out pressure limit plus suction
pressure deadband but it cannot violate the compressor short cycle time delay
and allowable reset times mentioned below.
Add a lock-out logic with allowable reset times that compressor is shut down by a

low pressure condition. If the low pressure reset times in one hour equals the
10-2014
F). Also add a suction temperature deadband (1 to 5
⁰
F).
⁰
gForce User Manual ● 111