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Design of oil level controllers and accessories
The volume of the reservoir must be sufficiently large to compensate for different oil circulation rates in the system
(e.g. increased oil return from evaporators after defrosting). Oil level controllers, oil reservoirs, differential pressure
valves, oil filters (in the feed line to controllers), oil separators and check valves must be designed in accordance
with manufacturer's specifications. In addition, check valves and oil separators are subject to the information given
above ( Parallel compounding with optimized suction header , Parallel compounding with optimized suction header ).
Most BITZER reciprocating compressors have a screwed sight glass with a 1 1/8-18 UNEF connection, for details
see the Operating Instructions of the respective compressor. Adaptors for mounting the oil level controllers are sup-
plied by their respective manufacturers.
with adaptor for screw connection
Fig. 10: Examples of oil level controllers for screwed and flanged connections (source: Armaturenwerk Altenburg, AWA)
Suction and pressure headers for use with oil level controllers
Headers and pipes can be designed in accordance with the versions shown above ( Parallel compounding with op-
timized suction header , Parallel compounding with optimized suction header ). However, suction headers have
lower overall symmetry and gas velocity requirements: A lateral suction gas inlet is possible, and several suction
line groups can be operated in parallel (e.g. with different suction pressures). For this case, a system with high-
pressure reservoir is recommended for "standard refrigerants", in order to guarantee enough oil pressure at the
controllers under all operating conditions. However, the pipe sections connected to the compressors should con-
form to the recommended design.
NOTICE
!
!
Danger of liquid slugging!
In parallel compounding with oil level controllers, observe the recommended pipe layout!
Execute the construction such that no oil or refrigerant condensate (from the header) can flow back to the
compressor at standstill.
In general, pressure headers and check valves must fulfil the criteria mentioned above ( Parallel compounding with
optimized suction header ).
KT-600-6 // PDF Download
Oil level controller
with adaptor for flange connection
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