Se-E2; Monitoring Of The Oil Circuit; Safety Devices For Pressure Limiting (Hp And Lp); Oil Heater - Bitzer CSH6553-35Y Instructions De Service

5.4.3

SE-E2

Optional protection device for operation with frequency
inverter and soft starter (for a ramp time shorter than
1 s).
• Dimensions and integration in the control identical to
SE-E1.
• Suitable for all CS. compressors.
• Monitoring functions are essentially the same than
those of SE-E1. However, the SE-E2 monitors phase
failure during the complete running time of the com-
pressor.
For further details, see the Technical Information
ST-122.
5.4.4

Monitoring of the oil circuit

• For short circuits without liquid injection (LI) for addi-
tional cooling and for small system volume and small
refrigerant charge: Indirect monitoring with oil tem-
perature sensor (standard)
NOTICE
!
!
Lack of oil leads to a too high increase in tem-
perature.
Risk of damage to the compressor!
• For circuits with liquid injection (LI) for additional
cooling and / or for great system volume as well as
parallel compounding: Monitor oil level directly with
opto-electronic oil level monitoring (option), see
chapter Opto-electronic oil level monitoring OLC-D1-
S, page 45. The connection is on the compressor
housing, see chapter Connections and dimensional
drawings, page 35, position 8.
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.
SB-170-7
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.
5.4.5

Safety devices for pressure limiting (HP and LP)

• These safety devices are required for securing the
compressor's application range in order to avoid un-
acceptable operating conditions.
• Do not connect any safety devices to the service
connection of the shut-off valve!
5.4.6

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.
Connection according to Technical Information KT-150.
Insulting the oil separator
Operating at low ambient temperatures or with high
temperatures on the high-pressure side during stand-
still (e.g. for heat pumps) requires additional insulation
of the oil separator.
45