Manage operating envelope
Evaluate the risk
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 Integrated)
Advanced:
• HP and LP sensor
• Operating envelope limits (permanent and transient)
integrated into control logic
• (DGT Integrated)
See “Test, criteria and solutions”
No additional test are required
HP switch setting
MOP + t
est N
o
3
LP swit
ch setting
Condensing pressure control
DGT (in
teg
rated)
tests N
o
1 and 2
Test, criteria and solutions
Test N°
Purpose
Test condition
Pass criteria
Solutions
1
Check the
compressor
operation in
the “continuous
running area”.
Start test at minimum foreseeable
evaporating temperature (minimum
ambient temerature)
Confirmed compressor stable
working in the continuous running
area.
Work on compressor staging, fan
staging, water flow etc.
2
Perform a defrost test if reversible
unit
3
Perform a start-up test at maximum
foreseeable evaporating temperature
(max ambient temperature, or start
up with hot water)
Improve MOP function.
Work on compressor staging,fan
staging, water flow etc.
Continuous
Running Area
30
FRCC.PC.012.A7.02
GENER
AL INFORM
ATION
PR
ODUC
T INFORM
ATION
INTEGR
ATION INT
O SY
STEM
ORDERING INFORM
ATION
SY
STEM DESIGN