Bitzer KB-203-3 Air Cooled Condensing Units Instruction Manual

KB-203-3 Air Cooled Condensing Units
Instruction Manual

KB-203-3 Air Cooled Condensing Units

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LHV7E/4CE-6.F1Y LHV?E/4D E-7. F(3)Y LHV7E/4CE-9.F(3)Y LHV7E/4VE-7.F(3)Y LHV7E/4TE-9.F(3)Y
LHV7E/4PE-12.F(3)Y L HV7 E/ 4 N E-14. F ( 3) Y

Introduction

The statements in this document refer to the EU legis­lation. They apply equally to the corresponding require­ mints of the United Kingdom legislation if the product has a UK declaration and is labelled in accordance with UK requirements.
This partly completed machinery is intended for incor­poration into systems in accordance with the EU Ma­ Chinnery Directive 2006/42/EC and The Supply of Ma­ Chinnery (Safety) Regulations 2008 of the United King­ dom.
The product is covered by the scope of the EU RoHS Directive 2011/65/EU and The Restriction of the Use of Certain Hazardous Substances in Electrical and Elec­ tonic Equipment Regulations 2012 (as amended) of the United Kingdom.
The air cooled condensing unit also is covered by the scope of the EU Eco- design Directive 2009/125/EC and The Eco-design for Energy-Related Products Regula­ tins 2010 of the United Kingdom. The frequency inverter complies with the  EU Directive for Electromagnetic Compatibility 2014/30/EU and The Electromagnetic Compatibility Regulations 2016 of the United Kingdom.
For a pressurized component the EU Pressure Equip­ment Directive 2014/68/EU and The Pressure Equip­ment (Safety) Regulations 2016 of the United Kingdom may also be applied.
This product may only be put into operation if it has been installed into systems according to these Mount­ing/Operating Instructions and if the overall system complies with the applicable legal provisions. Applied standards see conformity document. It is displayed in the BITZER SOFTWARE for the respective product or in the documentation at www.bitzer.de.
This product has been built in accordance with state of the art methods and current regulations. Valves fitted to the product are not part of the product itself. Keep these Operating Instructions available near the system during the whole  lifetime. Intended use: Condensing or compressor unit for incor­poration into refrigeration and air conditioning systems
1. 1 Technical documents to be additionally observed
In addition to these instructions, the Operating Instruc­tions and Technical Information for the respective com­pressors and pressure vessels must be taken into ac­count (accessory kit for condensing unit).

• KB-104 Operating Instructions BITZER ECOLINE and ECOLINE VARISPEED.
• DB-300 Operating instructions Liquid receivers KT-210 ECOLINE VARISPEED: Semi-hermetic re­ ciprocating compressors with mounted suction gas­ cooled frequency inverter (Fl) F1.
• KT-220 ECOLINE VARISPEED OCTAGON CO, VARISPEED: Semi-hermetic reciprocating com­ pressor with mounted suction gas-cooled frequency inverter (Fl) F3/4.
• KT-203 Technical lnformationBITZER ECOSTAR: Air-cooled condensing units with frequency-con­ trolled ECOLINE compressors.
• CB-110 Operating Instructions VARI PACK
• BEST SOFTWARE
  The same applies to optional accessories (e.g. operat­ing instructions of the fan manufacturer).

Safety

2.1 Qualified and authorised staff
All work done on the products and the systems in which they are or will be installed may only be performed by qualified and authorised staff who have been trained and instructed in all work. The qualification and com­petence of the  qualified staff must correspond to the local regulations and guidelines.
2.2 Residual risks
The products, electronic accessories and further system components may present unavoidable residual risks. Therefore, any person working on it must carefully read this document! The following are mandatory:

• relevant safety regulations and standards
• generally accepted safety rules
• EU directives
• national regulations and safety standards

Depending on the country, different standards are applied when installing the product, for example: EN378, EN60204, EN60335, EN 1SO14120, 1ISO5149, IEC60204, IEC60335, ASHRAE 15, NEC, UL standards.
2.3 Safety references
Safety references are instructions intended to prevent hazards. They must be stringently observed!

NOTICE
Safety reference to avoid situations which mayresultin damage to a device or its equipment.
CAUTION
Safety reference to avoid a potentially hazardous situation which may result in minor or moderate injury.
WARNING
Safety reference to avoid a potentially hazardous situation which could result in death or serious injury.
DANGER
Safety reference to avoid an imminently hazardous situation which may result in death or serious injury.
2.3.1 General safety references
State of delivery

CAUTION
The condensing unit is filled with a protective charge: Excess pressure 0.2 .. 0.5 bar nitrogen. Risk of injury to skin and eyes.
Depressurised the condensing unit! Wear safety goggles!

For work on the condensing unit once it has been commissioned
WARNING
Compressors or other components of the condensing units may be under pressure!
Serious injuries are possible.
Depressurised all relevant components!
Wear safety goggles!
CAUTION
Surface temperatures of more than 60°C or below 0°C.
Risk of burns or frostbite.
Shut off accessible areas and mark them.
Before performing any work on the condensing unit: Switch it off and let it cool down or warm up.

CAUTION
The fins of the condenser have sharp edges!
Risk of lacerations.
Before performing any work on the condensing unit: Wear protective gloves.
When working on the fans of the heat exchangers: Ob-serve the operating instructions of the fan manufacturer!
DANGER
Rotating fan blades!
Body parts may be injured, bone fractures!
Clothes may be caught and drawn into the protective grating!
Work on the fan only when it is at standstill!
When working on the electrical system and the frequency inverter:
DANGER
Electric shock!
Electric charge > 50 uC! Life-threatening voltages on the connection cable of the frequency inverter and fan even after disconnecting the voltage supply!
After disconnecting the voltage, wait five minutes before starting work on the electrical system!
Classification of the condensing units and their components according to EU directives
The condensing units are intended for incorporation into machines in accordance with the EU Machinery
Directive 2006/42/EC. For the incorporated pressurized components, the EU Pressure Equipment Directive 2014/68/EU may be applicable, except for the compressors (see below). The corresponding declarations of conformity and manufacturers’ declarations are available.

Information
** Condensing units are not considered a “functional whole” according to the PED and do therefore not fall within the scope of Art. 2, 6 “Assemblies”. The directive is therefore only applied to the individual components. The same applies  to the CE marking. Assessment by a notified body: Bureau Veritas, Paris – “Technical Appraisal” for ASERCOM members PED- TA_ASE_001_01-DEU.
Information
** According to Article 1(2) j, ii, semi-hermetic and open drive compressors are excluded from the application range of the PED. This exception is confirmed by the expert opinion of a notified body. Please refer to “Explanations about the product conformity” AC-100 for further explanations. Please refer to AC-100 for the classification of pressurized accessories for compressors.
Pressure equipment in the condensing unit
The piping supplied comes fully assembled in the condensing unit ex works. The pipes have been properly assembled and tested for leaks. No modifications may be made to the pipes.
The pipes and their joints are maintenance-free.
The system’s pipes, pressure vessels and other pressure equipment that do not bear a name plate either fall under Article 4 (3) according to PED 2014/68/EU or have to be classified in Category according to Article 13.
As components of the condensing unit according to PED Article 1 (2), they are exempt from the application of the Pressure Equipment Directive, since the condensing unit is covered by the 2006/42/EC Directive as partly completed machinery.
Safety instructions and application notes are included in the condensing unit’s operating instructions.

explanation AC-100
Discharge aas shut-off valve| I Art. 1 (2) f| X| ≤ DN32 / PS 32 bar
Suction gas shut-off valve| Art. 1 (2) f| X| ≤ DN50 / PS 19 bar
Condenser, air-cooled| Art. 1 (2) f| X| ≤ DN32 / PS 32 bar
Condenser fan| | X|
Liquids line, condensate line| I Art. 1 (2) f| X| ≤ DN25 / PS 32 bar
Pipe joints| I Art. 1 (2) f| x| ≤ DN50 all joints
Discharge as line| I Art. 1 (2) f| X| ≤DN25 / PS 32 bar
Suction gas line| Art. 1 (2) f| X| ≤ DN50 / PS 19 bar
Solenoid valve with injection nozzle (RI)| Art. 1 (2) f| X| ≤ DN25 / PS 32 bar
Liquid receiver| II| | 6.25 .. 31.25 dm3 / PS 32 bar
Liquids shut-off valve| I Art. 1 (2) f| X| ≤ DN25 / PS 32 bar
Oil separator| Art. 1 (2) f| X| < 6.25 dm3 / PS 32 bar
Check valve| I Art. 1 (21f| X| ≤ DN32 / PS 32 bar
Filter drier| Art. 1 (2) f| X| < 1 dm3 / PS 32 bar
 Sight glass| Art. 1 (2) f| X| < 1 dm3 / PS 32 bar
HP limiter/HP cut-out| IV| | With safety function
Safety pressure cut-out| IV| | With safety function
LP limiter| Art. 1 (2) f| X| < 1 dm3 / PS 32 bar
Pulsation muffler| Art. 1 (2) f| X| < 1 de / PS 32 bar
Discharge gas temperature sensor| Art. 1 (2) f| X| ≤ DN25 / PS 32 bar
Suction gas temperature sensor| Art. 1 (2) f| X| ≤ DN25 / PS 32 bar
High pressure transmitter| Art. 1 (2) f| X| < 1 de / PS 32 bar
Low pressure transmitter| Art. 1 (2) f| X| < 1 dm3 / PS 32 bar
Ambient temperature sensor| Art. 1 (2) f| X| ≤ 0N25 / PS 32 bar
OLC-K1 / Delta Pall / MP54/55| Art. 1 (2) f| X| < 1 dm3 / PS 32 bar

Tab. 1: Classification of the ECOSTAR components according to the EU Pressure Equipment Directive PED 2014/68/EU, MD 2006/42/EC
1 Fluid group 2 according to PED (refrigerant group A1/ EN378). Maximum allowable pressure PS: 32 bar (HP), 19 bar (LP)

State of delivery and schematic design of the ECOSTAR condensing units

• Protective gas charge: Excess pressure approx. 0.2..0.5 bar.
• For the technical data, see brochures of the condensing units: KP-210.

Fig. 1: Schematic design of the ECOSTAR condensing units (example LHV7EJ..)

Component

| Scope of delivery
---|---
| | Stand.| Opt.
1| Compressor, semi-hermetic| X|
1a|  Discharge gas shut-off valve| X|
1b|  Suction gas shut-off valve| X|
2| Condenser, air-cooled| X|
2a| Condenser fan| X|
&)| Liquid line pipe joints| X|
3a|  High pressure transmitter| X|
4| Liquid receiver| X|
4a|  Liquid shut-off valve| X|
5|  Frequency inverter| X|
5a|  Terminal box of the condensing unit| X|
6| Discharge gas line pipe joints| X|
8| Oil separator| | X
9| Check valve| |
10|  Liquid line pipe joints| X|
11| Filter drier| X|
12|  Sight glass| X|
13| Suction line pipe joints| X|
13a| Low pressure transmitter| X|
18|  HP limiter/ HP cut-out| X|
19|  LP limiter| X|
22| Discharge gas temperature| X|
23|  Suction gas temperature| X|
24| Solenoid valve with injection nozzle (RI)| | X

Tab. 2: Legend and state of delivery ECOSTAR condensing units

Application ranges

Permitted refrigerant 1 depending on compressor model| R134a, R404A, R407A, R407C, R407F, R448A, R449A, R450A, R507A, R513A, R22
---|---
Qil charge 2| t, < 70°C BITZER BSE32 R22: BITZER B5.2
Maximum allowable pressure (PS)| LP: 19 bar, HP: 32 bar

Permitted refrigerant and application limits see BITZER SOFTWARE.

1. Further refrigerants upon request.
2. For alternative oils see Technical Information KT-500.

WARNING
Risk of bursting due to counterfeit refrigerants!
Serious injuries are possible!
Purchase refrigerants only from reputable manufacturers and reliable distributors!

5.1 Maximum allowable pressure
The whole system must be designed and operated in order to guarantee that the maximum allowable pressure (PS) cannot be exceeded in any part of the system.
Pressure relief valves on receivers (pressure vessels) are absolutely necessary if:

• it is to be expected that the maximum allowable pressure will be exceeded due to external heat sources (e.g. fire).
• the entire refrigerant charge of the system is more than 90% of the pressure vessel volume at 20°C (capacity). The vessel volume is defined as the volume between the valves that are installed upstream and downstream of a  pressure vessel and can be shut off during operation.
• check valve is located between condenser and receiver.

A pressure relief valve can be mounted at the customer’s, taking into account current standards and regulations.
Safety switching devices
According to local regulations, it may be necessary to provide additional pressure-limiting safety switching devices.

Mounting

6.1 Transporting the condensing unit
The condensing unit is delivered on a pallet. Remove the two longitudinal boards at the front and back of the pallet so that the condensing unit only rests on the two lateral squared timbers. Then use a forklift and slide the forks from the  front into the guide rails (see figure 3, page 32) under the condensing unit. Lift the condensing unit and remove the lateral squared timbers. Alternatively, pass lifting straps through the outer feet of the condensing unit and lift the  condensing unit. In doing $0, maintain a minimum distance of >1.1 m between the suspension eye and the device. See also included information sheet 378 203 91.
6.1.1 Transport locks for condensing units
To avoid transport damage to condensing units in their state of delivery, the vibration dampers of the compressors are blocked by transport locks. It is absolutely necessary to remove or loosen these locks after mounting.
6.2 Installing the condensing unit
The place of installation must have sufficient load-carrying capacity and must be level, vibration-resistant and have sufficient space upwards (for unhindered air outlet of the fans) (see figure 2, page 31).
During system design, take the minimum and maximum loads into account. Design pipework and risers according to the generally known rules for compound systems. Contact BITZER if the system is operated under extreme  conditions (e.g. aggressive atmosphere, low outdoor temperatures, etc.).
Ensure good accessibility for maintenance and service work!
NOTICE
When installing the condensing unit in areas Where extreme wind loads may occur, screw it always firmly to the ground! If installed on a roof, provide sufficient lightning  protection!

NOTICE
Do not mix fresh air with condenser air!
6.3 Pipelines
The pipelines must be as short as possible in order to minimise pressure drops and to keep the refrigerant quantity available in the pipeline system as low as possible.
NOTICE
During soldering work on the suction gas line: Protect the low pressure transmitter, the suction gas temperature sensor and the insulation against excess heat, max. 120°C!
NOTICE
During soldering work on the liquid line, protect the sight glass from overheating (max. 120°C)!
The sight glass contains an O-ring.
6.4 Connections and dimensional drawing

Connection points

Tab. 3: Connection points
Dimensions (if specified) may have tolerances according to EN I1SO 13920-B.

Electrical connection

According to the EU Machinery Directive 2006/42/EC annex |, the products and their electrical accessories are subject to the protection objectives of the EU Low Voltage Directive 2014/35/EU. For any work performed on the electrical system: EN60204-1, the IEC60364 series of safety standards and national safety regulations must be observed.
When working on the electrical system and the frequency inverter:
DANGER
Electric shock!
Electric charge > 50 uC! Life-threatening voltages on the connection cable of the frequency inverter and fan even after disconnecting the voltage supply!
After disconnecting the voltage, wait five minutes before starting work on the electrical system! The areas marked dark in the illustration are those where voltage can still be present after the supply voltage has been switched off. This is the connection area of the power cables of the frequency inverter and the EC fans. Special care  must be taken there.
7.1 State of delivery
The condensing unit is delivered fully wired. All options are already programmed in the controller. The cable connections between the controller and terminal strips in the terminal box are pre-fitted. For connection of the power and  communication cables, see the following chapters.
7.1.1 Representation of components and cables Components

• Standard scope of supply
  These components are filled in grey in the schematic diagrams, slightly darker than the optional components.

• Optionally available components are filled in light grey.

• Components not included in the BITZER portfolio are filled in white.

• Components that are not included in each condensing unit are shown dashed.

• Retrofittable options: The cable connections are shown as an arrow to the respective terminal.

Motor connection in the terminal box
The terminal plates of the compressors vary depending on the motor power. Therefore, the motor connection is only shown schematically and surrounded by a dashed line. There is an adhesive label on the inside of the terminal box cover that describes the motor connection in detail.
7.1.2 Wiring diagram part 1
see figures 4, 5 and 6on the following three pages

7.1.3 Wiring diagram part 2
see figures 7 and 8 on the following two pages

7.1.4 Components of wiring diagrams
Components without further terminal strips
F3: Control circuit fuse
F4: Oil heater fuse
K1: Main contactor
M1: Compressor
N1: Frequency inverter (FI)
Q1: Main switch
T1: Transformer

Bl: Controller terminal strip| Cornponent| Ter- mina!| Designation
---|---|---|---
direct integer| 2x Mini- B-USB| | | | data connection
| RS485| | | | Modbus connection
| RJ45| | | | Ethernet connection
| Bluetooth| | | | data connection
| H4| | | | integrated display
CN5| R3| 5,| 6| | discharge gas temperature sensor
| R4| 2,| 3| | ambient temperature sensor
CN6| R8| 2,| 3| | suction gas temperature sensor
CN7| H1| 1, 6| 4,| 5,| external display (data connection at CN3)
CN11| B3| 4,| 5,| 6| high pressure transmitter
| B4| 1,| 2,| 3| low pressure transmitter
CN12| S5| 1,| 3| | potential-free contact for Dl l
B1: Controller
terminal strip| Component| Terminal| Designation
---|---|---|---
| S6| 2,6| potential-free contact for DI2
CN13| | | status message (potential-free)
| H2| 2,1| signal light: ready-to-operate
| H3| 3,1| signal light: fault
CN15| H1| 1,2| external display (voltage supply at CN1)
K5: Relay module
terminal strip| Component| Terminal| Designation
---|---|---|---
CN22| F1| 1| fuse of fan 1
| F2| 3| fuse of fan 2
Terminal strip X101| Component| Terminal| Designation
---|---|---|---
X101| SE-B*| 5, 6, 7,8| compressor protection device
| Delta Pl| 17, 18, 19, 20, 21, 22| oil pressure monitoring
| OoLC-K1| 17, 18, 19, 20, 21, 22| oil level monitoring
| F5| 9, 10 (PE)| high pressure switch
| F6| 11, 12| low pressure limiter
| M2| 27, 28, 29, 30, PE| fan 1 (supply/ alarm)
| M3| 23, 24, 25, 26, PE| fan 2 (supply/ alarm)
Terminal strip X101| Component| Terminal| Designation
---|---|---|---
| R6| 15, 16| oil heater
| S2| 1, 2| external release
| Y1| 3,4| solenoid valve in liquid line
| Y2| 14, 13| RI solenoid valve (refrigerant injection)
Ter­minal strip X102| Com­ponent| Ter­minal| Designation
---|---|---|---
X102| M2| 6, 7, 8, 15, 16| fan 1 (set point/BUS)
| M2| 4, 5, 12, 13, 14| fan 2 (set point/BUS)
| R1, R2| | resistors
| R5| 3, 11| sensor for cold store temperature
| K1| | compressor contactor

7.2 Prepare electrical connections
► Open terminal box of condensing unit.
► Switch off main switch in terminal box.
► Remove main fuse.
► Wait for at least 5 minutes.
► Before touching, earth every terminal and cable end.
► Open front of weather protective housing:
► Loosen the screw on top of front grating.
► Remove front grating.
► Remove lower covering plates.
7 .3 Connecting the condensing unit electrically
NOTICE
Protect controller B1 from overvoltage!
Apply a maximum voltage of 24 V to B1 and connect condensing unit to neutral conductor!
7.3.1 Power connection
These five electrical connections are mandatory for the condensing unit to function.
► Route power connection cable through the large cable bushing below the terminal box into the housing of the condensing unit.
► Route power connection cable out of the housing of the condensing unit through the screwed cable bushing M40 from below into terminal box.
► Connect L 1, L2, L3, N and PE, figure see KT-203.
► Attach protection caps against contact.
► Check voltage between all phase conductors and the neutral conductor.
7 .3.2 Communication cables
All these connections are optional.
► Route all communication cables through the little cable bushing below the terminal box into the housing of the condensing unit et through a screwed M25x1 .5 cable bushing from below into terminal box.

This diagram shows the position of the terminals in the terminal box on the left and a schematic diagram of cables and terminals on the right. The cables shown in thin lines are wired as delivered. Thick lines represent the cables that can  be terminated on site.
Dark lines represent the areas where voltage can be present even after the main switch has been switched off. This is the connection area of the power cables of the frequency inverter and the EC fans. Do not work in the connection box  until five minutes after the main switch has been switched off and all poles have been disconnected from the power supply!
Data cable for superior controller
Several options are available for communication with the superior system controller. These connections can also be used for a controlled network of up to four ECOSTAR.

• 2x Mini-B-USB
• Modbus RS485
• RJ45 (Ethernet)
• integrated Bluetooth chip

Connecting optional components

H1| external display, option An B 1, terminal strips CN7 terminals 1, 4 to 6 and CN15 terminals 1 et 2. Do not remove existing cables from CN15.
---|---
H2| signal light: ready-to-operate, option An CN13 terminals 1 and 2.
H3| signal light: fault, option An CN13 terminals 1 and 3.
R5| sensor for cold store temperature, option An X102 terminals 3 and 11.
S2| external release, option An X101 terminals 1 and 2. To do this, remove the bridge from these terminals.
S5| digital input D11, option An CN 12 terminals 1 and 3.
S6| digital input Dl2, option An CN 12 terminals 2 and 6.
T6| Isolation amplifier for set point ad­justment, option An X102 terminals 1 and 2.
If voltage-dependent set point ad­justment is selected (0 … 10 V): Re­ move resistor R2.
Y1| solenoid valve in liquid line, option An X101 terminals 3 and 4.
Y2| RI solenoid valve (refrigerant injec­tion), option An X101 terminals 14 and 13.
Delt a-PII or OLC -D1| oil monitoring, can be retrofitted de-pending on compressor model An X101 terminals 17 to 22.

For further information on electrical connection and function of the components, see Technical Information KT-203.
External display H1
The schematic representation of the terminal box above does not show the connections for the external display.
For details on the connection, see the wiring diagrams.

Commissioning

For a detailed description, please refer to the Operating Instructions KB-104 of the compressor:

• Check tightness

• Evacuate

• Refrigerant charge

• Checks before starting

• Compressor start

•  Settings on the controller
  – Preferably with BEST SOFTWARE via Modbus or with BEST App via Bluetooth
  – Further explanations can be found in BEST SOFTWARE

• A few days after commissioning, read out the data log and save it with BEST.

8.1 Reset authorization codes and Bluetooth password to factory settings
Keep the signal contact between terminal 4 and 6 on terminal strip CN12 closed for at least 5 seconds.
The authorization codes for the display, the passwords for the web server and the Bluetooth password will then be reset to factory settings.

• Authorisation code “Guest”: 1
• Authorisation code “Installer” and Bluetooth pass­ word for firmware versions < 5: 2
• Bluetooth password for firmware versions > 5: 8670

8.2 Lubrication/ oil level check
During commissioning, check the oil level under min­imum and maximum load conditions (25 or 30/87 Hz). Check it again after a few days of operation. If the oil level is permanently below¼ sight glass height, the missing oil quantity  must be added. Document the ad­ded quantities and keep the documents ready at the place of installation.
For critical applications, use oil monitoring (contact BITZER):

• OLC-K1 for 2DES-3.F1Y (for further information, see KT-180).
• Delta-PII for 4FE-5.F1Y .. 4NE- 14.F(3)Y (for further information, see KT-170).

8.3 Vibrations and frequencies
The pulse frequency of the gas column in the discharge gas line and the excitation frequency on the com­ pressor feet and on the pipes vary depending on the compressor speed. This may lead to resonance effects in the pipes and in other  system components.
Check the system carefully over the entire speed range to detect any abnormal vibration; check pipes and ca­pillary tubes in particular. In case of strong vibrations, take mechanical measures: for example use pipe clamps or install vibration dampers.

NOTICE
Risk of burst pipes and leakages on the com­ pressor and system components!
Avoid strong vibrations!

Operation

9.1 Regular tests
The condensing unit must be checked by a specialist at regular intervals. The inspection intervals depend on the refrigerant, the coolant and the operation mode.
They must be defined by the end user.

CAUTION
L:Lisk of injury due to escaping vapours on the pressure relief valve
Do not work in the area where the vapours es­ capes from the pressure relief valve!
Check the following items:

• Oil level of the compressor.
• Evaporation temperature.
• Suction gas temperature.
• Condensing temperature.
• Difference between condensing temperature and air inlet temperature into the condenser.
• Discharge gas temperature.
• Oil temperature.
• Cycling rate.
• Current consumption of the compressor.
• Current consumption of the condenser fan(s).
• Visual inspection of cables and components and check of electrical connection points.

DANGER
**** Fire hazard caused by damaged electrical components!
Replacement of electrical components if dam­age, traces of smoke or abnormal discolorations are detected.

• Tightness of the refrigerating circuit.
• Suction gas superheat.

Update the data protocol and compare it with previous measurements. Read out the data log, save and com­ pare it using BEST SOFTWARE or the app. In case of larger deviations, determine the source and correct it.
Also check the following items and perform mainten­ance work if necessary:

• Contamination of the condenser.
• Unhindered air flow to and from the condensing unit.
• Refrigerant charge (level in liquid sight glass).
• Humidity of the refrigerant (moisture indicator) – replace the filter drier if necessary.
• Test the fan function.
• Check pipelines and fans for abnormal vibrations.
• Check safety-relevant parts, for example pressure limiter, motor protection device.
• Check the ventilation slot of the frequency inverter for contamination and clean it if necessary.

For information about oil change and further mainten­ance work, please refer to the operating instructions of the compressor and the pressure vessel.

Decommissioning

10.1 Standstill
Leave the oil heater switched on until disassembly.
This prevents increased refrigerant concentration in the oil.
10.2 Disassembly of the condensing unit or of components

WARNING
Compressors or other components of the con­densing units may be under pressure!
Serious injuries are possible.
Depressurised all relevant components!
Wear safety goggles!
WARNING
Risk of electrical shock!
Voltage may be present on electrical components!
Disconnect the voltage supply! Remove the fuses!

Close the shut-off valves upstream and downstream of the component in question. Extract the refrigerant. Do not vent the refrigerant, but dispose of it properly! Loosen screwed joints or flanges on the compressor valves. Remove the  compressor from the system; use hoisting equipment if necessary.
10.3 Drain oil
Refer to the Operating Instructions for compressor and oil separator.
Dispose of waste oil properly!
CAUTION
When the system has been in operation, the temperature of the oil in the compressor and in the oil separator may be over 60°C.
Serious burns are possible.
Before performing any work on the condensing unit: switch off the system and allow it to cool down.
10.4 Remove or dispose of the compressor and other components
Remove the refrigerant and the oil (see above). Dis­posal of individual components or of the complete con­densing unit:

• Close open connections gas-tight (e.g. shut-off valves, flange, screwed joints).
•  If necessary, transport heavy components with hoist­ing equipment.
• Have the components repaired or dispose of them properly.

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