KRIWAN INT280-60 Quick Start Manual

INT280-60

®

INT280-60

®

Application

The INT280-60 is a further development of the reliable KRIWAN oil level
regulators.
The oil level regulator INT280-60 monitors and controls the oil level in
the refrigerant compressors. The problem of poor oil distribution in
multi-compressor packs has been overcome by actively supplying oil
from the oil reservoir. This minimizes the risk of operating without
enough oil in the compressor.

Functional description

If the oil level is too low, the intelligent filling algorithm controls the oil
refill. To do this, the integrated solenoid valve is opened cyclically.
The oil level regulator switches the compressor off through the internal
relay if the oil level remains too low after an extended period of time. Oil
refilling continues after this.

When the oil level is sufficient the relay tightens, the compressor can
start again.

INT280-60

L1

L2

L3

N

PE

The reactions are time delayed, to prevent unnecessary switching in
response to temporary fluctuations in the oil level.

The INT280-60 has its own monitoring system of the optical sensor. In
the event of malfunctions or soiling, the relevant warning or error will be
notified.

The integrated LED signals the current status.
For operation in the specified manner, the supply voltage has to be on

permanently on the INT280-60.

H1

Ø50

Ø47.6

Ø6.7

Alarm

F1 F2 Q1

12 345

INT280-60

169 93.9

111. 5 9

M

3 AC

Wiring diagram

60

32

97

Product group SEdition: 710.00566.0

29.5

34°

Ø58.5

112°

90°

KRIWAN Industrie-Elektronik GmbH · Allmand 11 · D-74670 Forchtenberg · phone [phone] · fax [phone] · e-mail: [e-mail] · home: www.kriwan.com

45°

Dimensions in mm

Technical changes reserved

INT280-60

®

Installation instructions

•

Prior to installation, ensure that the O-ring at the connecting flange is
seated properly.

•

There must be no foreign objects in the oil infeed or outfeed area of
the INT280-60.

•

The device has to be mounted to the compressor horizontally. It can
be rotated by 180°.

•

Use matching washers for the flange fastening screws.

•

Oil level regulator is pre-assembled in installation position.

•

Manually screw in the screws.

•

Afterwards tighten the screws alternating with a torque of 9Nm (M6,
steel 8.8, dry).

•

The electrical connection needs to be carried out according to the
wiring diagram.

•

For use at low temperatures, an oil sump heater has to be installed,
to ensure trouble-free operation of the INT280-60.

•

An oil filter has to be installed in the oil infeed line of the INT280-60,
to prevent the solenoid valve seat from getting dirty.

•

Before the refrigerating system is filled with refrigerant, the system
and the connections of the INT280-60 have to be checked for leaks.

The mounting, maintenance and operation are to be carried out
by an electrician. The valid European and national standards for
connecting electrical equipment and cooling installations have to
be observed.

Connection lines that extend from the terminal box have to
feature at least a basic insulation.

The user has to ensure that the connections are properly tight.
The electrical connection needs to be carried out according to
the wiring diagram.

Prior to installation, ensure that the pressure in the refrigeration
circuit is and stays equal to the atmospheric pressure.

The voltage supply to the INT280-60 must be switched off prior
to installation/connection and the subsequent tasks.

Product group SEdition: 710.00566.0

INT280-60

Flash code

The KRIWAN flash code al lows for a qu ick and easy s tatus displ ay and
troubleshooting.
The flash code consists of a cyclical flash sequence (red / orange or
green / orange). The current status can be determined from the number
of pulsing flashes.

1.5s

Break 1 green / red

(1-5 pulses)

Overview flash code

Green lit Oil level OK
Green flashing Oil level too low, fill
Green/Orange flashing Warning, see below for description
Red/Orange flashing Error, compressor is switched off; for

Warning

1st flashing
sequence
(LED green)

1 2 Oil level monitoring:

2 1 General:

2nd flashing
sequence
(LED orange)

2 General:

Error

1st flashing
sequence
(LED red)

1 1 Oil level monitoring:

2 1 General:

2nd flashing
sequence
(LED orange)

2 Oil level monitoring:

3 Oil level monitoring:

3 General:

4 General:

0.8s 1.5s

Break 2 orange

description see table below

(1-5 pulses)

Description

Soiled optics, stage 1

Low supply voltage

Unexpected filling behaviour
identified

Description

Oil level too low

Soiled optics, stage 2

Internal sensor fault

Supply voltage too low

Internal alarm

External alarm

Break 1

Flash code

®

Technical changes reserved

KRIWAN Industrie-Elektronik GmbH · Allmand 11 · D-74670 Forchtenberg · phone [phone] · fax [phone] · e-mail: [e-mail] · home: www.kriwan.com

INT280-60

®

Technical specifications

Supply voltage

- 52 S 581 S026 AC 50/60Hz 230V ±10% 25VA

- 31 S 581 S026 AC 50/60Hz 24V ±10% 25VA
Permissible ambient temperature

T

A

Permitted rel. humidity 10-95% r. h. no condensation
Medium temperature -30...+100°C
Operating pressure -1...+60bar
Test pressure 90bar
Differential pressure 1-25bar
Relay

- Contact AC 240V 2.5A C300

- Mechanical service life Approx. 1 million switching cycles
Protection class acc. to EN 60529 IP65
Supply

- electrical Push-in spring terminals

- Oil 7/16"-20 UNF
Mounting Flange (3-/4-hole)
Housing material Aluminium

Flow rate through valve 1l/min (water 20°C, 1bar

Permitted oils Mineral and ester oils without

Permitted refrigerants Non-corrosive, non-flammable
Mounting position Horizontal (rotatable by 180°), ±2°
Dimensions See dimensions in mm
Weight Approx. 1300g
Check base EN 61000-6-2, EN 61000-6-3

For additional technical details, see table of parameters

-30...+60°C

at least AC/DC 24V 20mA

0.25-0.75mm

PA glass-fibre-reinforced

differential pressure)

additives

EN 61010-1
Overvoltage category II
Pollution level 2

²

INT280-60

Table of parameters

Parameter name Unit Default

Filling cycle type Fixed
Filling time s 10
Break time % 20
Overfill time s 0
Oil deficiency alarm delay s 120
Soiling stage 2 Warning

®

Order data

INT280-60 (AC 24V) 31 S 581 S026
INT280-60 (AC 230V) 52 S 581 S026
Accessories and application

information

KRIWAN Industrie-Elektronik GmbH · Allmand 11 · D-74670 Forchtenberg · phone [phone] · fax [phone] · e-mail: [e-mail] · home: www.kriwan.com

see www.kriwan.com

Technical changes reserved

Product group SEdition: 710.00566.0

Product group SEdition: 710.00566.0

KRIWAN Industrie-Elektronik GmbH · Allmand 11 · D-74670 Forchtenberg · phone [phone] · fax [phone] · e-mail: [e-mail] · home: www.kriwan.com

Technical changes reserved