Bitzer HS.8551 Mode D'emploi page 9

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Fig. 4: HS.85: ECO suction gas line with shut-off valve, pulsation
muffler and screw-in nozzle ①
I I n n f f o o r r m m a a t t i i o o n n
Notice for connecting external oil coolers, see
Manual SH-110.
I I n n f f o o r r m m a a t t i i o o n n
For other examples of pipe layout, see Manual
SH-110.
H H S S . . 9 9 5 5 : : E E C C O O c c o o n n n n e e c c t t i i o o n n
The ECO connection is located on the top side of the
compressor housing; a swan neck pipe for protection
against oil migration is therefore not required. Guide
the line horizontally or downwards from the connection.
The SD42 muffler can be installed horizontally or vertic-
ally in the pipe (see also Operating Instructions
DB-400). The CM-SW-01 compressor module is in
charge of operating and controlling the separate liquid
injection (LI) (for further details, see Technical Informa-
tion ST-150).
B B o o o o s s t t e e r r v v e e r r s s i i o o n n H H S S . . 8 8 5 5
An external oil pump will be required in systems where
sufficient differential oil pressure cannot be built up dir-
ectly after compressor start. This applies, for example,
to large parallel compound systems with extremely low
condensing temperature or to boosters. For such ap-
plications, a special version without oil stop valve has
been developed for HS.85 compressors. The delivery
also includes a solenoid valve that has to be installed in
the oil line.
SB-110-3 RUS SB-110-3
B B o o o o s s t t e e r r v v e e r r s s i i o o n n H H S S . . 9 9 5 5 ( ( c c u u r r r r e e n n t t l l y y n n o o t t a a v v a a i i l l a a b b l l e e ) )
O O i i l l c c o o n n n n e e c c t t i i o o n n
H H S S . . 8 8 5 5 : : P P r r e e s s s s u u r r e e g g a a u u g g e e c c o o n n n n e e c c t t i i o o n n o o n n t t h h e e o o i i l l v v a a l l v v e e f f o o r r
m m a a i i n n t t e e n n a a n n c c e e
The pressure gauge connection on the oil valve for
maintenance is delivered with a screwing cap
(7/16-20 UNF, tightening torque max. 10 Nm). In case
of any modification, proceed very carefully.
4 4 . . 4 4 H H S S . . 8 8 5 5 : : C C a a p p a a c c i i t t y y c c o o n n t t r r o o l l ( ( C C R R ) ) a a n n d d s s t t a a r r t t u u n n l l o o a a d d i i n n g g
( ( S S U U ) )
The HS.85 compressors are equipped by default with
"dual capacity control" (slide control). This allows both
infinite and 4-step regulation without any conversion of
the compressor. The only difference in the operating
mode is the activation of the solenoid valves.
I I n n f f o o r r m m a a t t i i o o n n
For detailed descriptions of capacity control,
start unloading and start unloading control, see
Manual SH-110.
CR2 (Y5)
CR4 (Y7)
CR3 (Y6)
CR1 (Y4)
Fig. 5: HS.85: Arrangement of the solenoid valves
C C R R
Start / Stop
CAP ⇑
CAP min 25% ① ⇓
CAP ⇔
Tab. 2: Infinite capacity control (CR) in the range 100% .. 25%
Y Y 1 1 Y Y 2 2 Y Y 3 3 Y Y 4 4
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