GENERAL INFORMATIONPRODUCT INFORMATIONINTEGRATION INTO SYSTEMORDERING INFORMATION SYSTEM DESIGN
System evaluation HP and LP must be monitored to respect
operating envelope limitations. We consider two
types of operating envelope management:
Basic:
• HP and LP switch
• MOP (Max Operating Pressure) ensured by expansion
device
• Condensing pressure control
• DGT external*
Advanced:
• HP and LP sensor
• Operating envelope limits integrated into control
logic
• DGT external*
See “Test, criteria and solutions”
HP switch setting
MOP < Max evap T°
LP switch setting
Condensing pressure control
DGT
tests N
o
1 and 2
Test, criteria and solutions
Test N° Purpose Test condition Pass criteria Solutions
1
Ensure
compressor
operate within
envelope
Start test at minimum foreseeable
evaporating temperature (minimum
ambient temerature...)
Continuous running within envelope
Work on compressor staging, fan
staging, water flow etc.
2
Perform a defrost test if reversible
unit
Manage operating envelope
* For DSH090 to DSH184
38 FRCC.PC.045.A7.02
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