Monitoring The Oil Circuit Hs.95 - Bitzer HS.8551 Instructions De Service

7 Oil cooler (if re-
quired)
9 Maintenance valve
(or Rotalock valve
on the compressor
(accessories))
Opto-electronic oil level monitoring OLC-D1-S
The OLC-D1-S is an opto-electronic proximity sensor
that monitors the oil level with infrared light. Depending
on the mounting position and electrical connection, the
same unit can be used for monitoring the minimum and
maximum oil levels.
The monitoring device comprises two parts: a prism
unit and an opto-electronic unit.
• The prism unit – a glass cone is mounted directly
into the compressor housing.
• The opto-electronic unit is designated as OLC-D1. It
is not directly connected to the refrigerating circuit. It
is screwed into the prism unit and integrated in the
system's control logic. No external control device is
required.
Delivery in a pre-setup state
If the prism unit of the OLC-D1-S has been ordered
pre-assembled, the compressor will have already been
tested as a whole in the factory for strength pressure
and tightness. In this case, it will only be necessary to
screw in the opto-electronic unit and to connect it elec-
trically (see Technical Information ST-130). Sub-
sequent tightness testing will not be required in this
case.
When retrofitting, both prism and electronic unit must
be mounted. For a detailed mounting description,
please see Technical Information ST-130.
Oil separator
Install the oil heater in the oil separator and connect it
according to the schematic wiring diagram. During long
shut-off periods, the oil heater prevents excessive refri-
gerant concentration in the oil and the resulting reduc-
tion of viscosity. It must be on when the compressor is
at standstill.
Insulate the oil separator:
• during operation at low ambient temperatures or
• at high temperatures on the high-pressure side dur-
ing standstill (e.g. heat pumps).
SB-110-3
8 Sight glass
10 Solenoid valve
(standstill bypass, if
needed)
Oil heater
The oil heater ensures the lubricity of the oil even after
long standstill periods. It prevents increased refrigerant
concentration in the oil and therefore reduction of vis-
cosity.
The oil heater must be operated while the compressor
is at standstill in case of
• outdoor installation of the compressor,
• long shut-off periods,
• high refrigerant charge,
• possible refrigerant condensation in the compressor.
5.4.5

Monitoring the oil circuit HS.95

External oil management system
Optimized external oil management system consisting
of:
• Oil filter
• Oil solenoid valve
• Opto-electronic oil level monitoring (see chapter
Opto-electronic oil level monitoring OLC-D1-S, page
17) − connected to the compressor module.
• Oil pressure transmitter − connected to the com-
pressor module.
17