Danfoss VZH052 Manual page 25

Manage oil in the circuit
Requirement
System evaluation
Test, criteria and solutions
Test N° Purpose
Check proper
1
oil return
Oil level must be visible or full in the sight
R
glass when the compressor is running and when
all compressors of the circuit are stopped.
Non split
Split
Test condition
A
Lowest foreseeable evaporation,
and highest foreseeable
condensation.
Minimum speed running 6 hours.
For reversible system, perform test
in both heating and cooling mode.
1. Since each installation is unique, test can not validate
the oil return, Oil separator is mandatory
2. Pay special attention to "Piping design" on field
3. Oil level must be checked and adjusted at
Pass criteria
Oil level must be visible or full in the
sight glass when the compressor is
running.
Single compressor
Test N°1
commissioning.
Solutions
1. Top-up with oil, generally 1-2% of
the total system refrigerant charge
(in weight). Above 3% look for
potential oil trap in the system.
2. Adjust oil boost function, for more
details see section"Oil management
logic".
3. Oil separator can be added
AB237586440343en-000601
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