Danfoss BOCK FK50 User manual

AQ453354265896en-000201

BOCK

Operating guide

FK50/460 N FK50/555 N FK50/660 N FK50/775 N FK50/830 N FK50/980 N

FK50/460 K FK50/555 K FK50/660 K FK50/775 K FK50/830 K FK50/980 K

FK50/660 K1 FK50/775 K1 FK50/830 K1 FK50/980 K1

FKX50/460 N FKX50/555 N FKX50/660 N FKX50/775 N

FKX50/460 K FKX50/555 K FKX50/660 K FKX50/775 K

FKX50/660 K1 FKX50/775 K1

FKX50/830 N FKX50/980 N

FKX50/830 K FKX50/980 K

FKX50/830 K1 FKX50/980 K1

Translation of the original instructions

2 | AQ453354265896en-000201 © Danfoss | Climate Solutions | 2023.07

About these instructions

Read these instructions before assembly and before using the compressor. This will avoid

misunderstandings and prevent damage. Improper assembly and use of the compressor can lead to

serious or fatal injury.

Observe the safety instructions contained in these instructions.

These instructions must be passed onto the end customer along with the unit in which the

compressor is installed.

The safety advice, which is contained in these instructions for assembly, and which is relevant for

regular operation and maintenance, must be forwarded by the manufacturer in his own documents

to the operator of the entire system. It must also be ensured, that personnel working in daily

operation with the compressor have access to important information such as safety and warning

advice about the compressor. Such persons must read the safety advice and have understood it.

Bock assumes no liability for any damage arising from non-compliance.

Contents Page

1 Safety 4

  1.1 Identicationofsafetyinstructions

  1.2 Qualicationsrequiredofpersonnel

1.3 Danger to life and limb in the event of faults during operation

1.4 General safety instructions

1.5 Intended use

2 Product description 6

2.1 Brief description

2.2 Name plate

2.3 Type key

3 Areas of application 8

3.1 Refrigerants

3.2 Oil charge

3.3 Limits of application

4Compressor assembly 9

4.1 Setting up

4.2 Maximum permissible inclination

4.3 V-belt drive

4.4 Main bearing load

4.5 Electromagnetic clutch assembly

4.6 Pipe connections

4.7 Pipes

4.8 Operating the shut-off valves

4.9 Operating mode of the lockable service connections

  4.10Suctionpipelter

4.11 Characteristics for K1 special housing

5 Commissioning 14

5.1 Preparations for start-up

5.2 Pressure strength test

5.3 Leak test

5.4 Evacuation

5.5 Refrigerant charge

5.6 Oil level check

5.7 Shaft seal

  5.8 Avoidingliquidshocks

6 Maintenance 16

6.1 Preparation

6.2 Work to be carried out

6.3 Shaft seal, emptying the oil reservoir

6.4 Recommended spare parts

6.5 Integrated decompression valves

6.6 Lubricants / Oils

6.7 Decommissioning

7 Accessories 19

7.1 Capacity regulator

7.2 Thermi protection thermostat

8 Technical Data 21

9 Dimensions and Connections 22

10 Declaration of incorporation 24

4 | AQ453354265896en-000201 © Danfoss | Climate Solutions | 2023.07

1|Safety

1.2 Qualicationsrequiredofpersonnel

DANGER Indicates a dangerous situation which, if not avoided,

will cause immediate fatal or serious injury.

WARNING Indicates a dangerous situation which, if not avoided,

may cause fatal or serious injury.

CAUTION Indicates a dangerous situation which, if not avoided,

may cause fairly severe or minor injury.

ATTENTION Indicates a situation which, if not avoided,

may cause property damage.

INFO Important information or tips on simplifying work.

WARNING Inadequatelyqualied personnelposes therisk ofaccidents,the

consequencebeingseriousorfatalinjury.Workoncompressors

isthereforereservedforpersonnelwhichisqualiedtoworkon

pressurized refrigerant systems:

• For example, a refrigeration technician, refrigeration mechatronic

engineer. As well as professions with comparable training, which

enables personnel to assemble, install, maintain and repair

refrigeration and air-conditioning systems. Personnel must be capable

of assessing the work to be carried out and recognising any potential

dangers.

1.1 Identicationofsafetyinstructions:

1.3 Danger to life and limb in the event of faults during operation

WARNING If a compressor continues to be operated during extreme running

noise and/or a sharp reduction in refrigerating capacity, there is

the danger of further events occurring, such as the fracture of the

housing wall. If people are standing in the immediate surround-

ings,thereis the riskof severe injury or evendeath from ying

parts.:

• In the event of extreme running noise, switch the compressor off

immediately.

• If there is a sharp reduction in refrigerating capacity, switch the

compressor off immediately.

• Secure the compressor against being switched on again.

• In such cases do not continue to operate the compressor under any

circumstances.

1|Safety

These assembly instructions describe the standard version of the FK50 manufactured by Bock. The

compressor is intended for use in refrigeration systems in compliance with the limits of application.

Onlytherefrigerantspeciedintheseinstructionsmaybeused.

Any other use of the compressor is prohibited!

The Bock refrigerating compressor named in the title is intended for installation in a machine (within

the EU according to the EU Directives 2006/42/EC Machinery Directive and 2014/68/EU Pressure

EquipmentDirective).

Commissioning is permissible only if the compressor has been installed in accordance with these

assembly instructions and the entire system into which it is integrated has been inspected and

approved in accordance with legal regulations.

1.5 Intended use

1.4 General safety instructions

WARNING Risk of accidents.

Refrigerating compressors are pressurised machines and as such

call for heightened caution and care in handling.

The maximum permissible overpressure must not be exceeded,

even for testing purposes.

Risk of burns!

- Depending on the operating conditions, surface temperatures of

over 60°C on the discharge side or below 0°C on the suction side

can be reached.

- Avoid contact with refrigerant necessarily.

Contact with refrigerant can cause severe burns and skin

damage.

6 | AQ453354265896en-000201 © Danfoss | Climate Solutions | 2023.07

2|Product description

Two different designs are available for various ranges of application:

> for air-conditioning the K Design

> for air-conditioning or normal cooling the N Design

The differences lie mainly in the valve plate tooling which is adapted to each applica-

tion range where operational safety and efficiency are concerned.

Compact six cylinder compressor in W design.

Six capacity ranges.

Lightweight aluminum design.

Lubricating oil pump with oil pressure relief valve independent of rotational direction.

Variable arrangement of the shut-off valves.

Fig. 1

2.1 Brief description

Fig. 2

Valve plate

Cylinder cover

Shaft end

Shaft seal

Suction shut-off valve

Suction line valve

Oil pump

Dimension and connection values can be found in Chapter 9

Eyebolt

Leak oil trapping

device with oil

reservoir

Name plate

Eyebolt

Oil sight glass

Oil sightglass

Discharge shut-off valve

Leak oil drain hose

2|Product description

FK 05 775 NX

1 Type designation

2 Displacement at 1450 rpm

3 LP: Max. permissible operating pressure

  (g)Lowpressureside

HP: Max. permissible operating pressure

  (g)Highpressureside

4 Machine number

5 Factory-lledoiltype

Fig. 3

2.2 Name plate (example)

2.3 Type key (example)

¹)K - specially for air-conditioning

N - specially for air-conditioning or normal cooling

²)X- Esteroilcharging(HFCrefrigerant,e.g.R134a,R407C)

Designs ¹)

Swept volume

Size

Ester oil charging ²)

Series

BB12345A029

19/28bar

Observe the limits of application

diagrams!

}

FKX50/775N

67,4

Bock GmbH, Benzstr. 7

72636 Frickenhausen, Germany

BOCK

Öl: BOCK lub E55

8 | AQ453354265896en-000201 © Danfoss | Climate Solutions | 2023.07

3|Areas of application

 Thecompressorsarefactory-lledwiththefollowingoiltype:

- for R134a, R404A/R507, R407C, R513A BOCK lub E55

- for R22 BOCK lub A46

Compressors with ester oil charge (BOCK lub E55)aremarkedwithanXinthetype

designation (e.g. FKX50/775N).

3.1 Refrigerants

• HFKW / HFC: R134a, R404A/R507, R407C, R513A

• HFCKW / HCFC: R22

3.2 Oil charge

3.3 Limits of application

ATTENTION Compressor operation is possible within the operating limits.

These can be found in Bock compressor selection tool (VAP)

under vap.bock.de. Observe the information given there.

- Max. permissible discharge end temperature: 140°C

- Permissible ambient temperature: (-20°C) - (+100°C)

-Max.permissibleswitchingfrequency:12x/h

-A minimum running time of 2 min. at equilibrium (continuous

operation) must be achieved.

Avoid continuous operation near the threshold. Should the com-

pressor happen to be used near the thresholds, we recommend the

use of a thermal protection thermostat (Accessories, Chap. 7).

For operation with capacity regulator:

- Continuous operation, when the capacity regulator is activated,

is not permissible and can cause damage to the compressor.

See Chapter 7.1.

- The suction gas superheat temperature may need to be reduced

or set individually when operating near to the threshold.

- When the capacity regulator is activated, the gas velocity in the

systemcannotundercertaincircumstancesensurethatsuf-

cient oil is transported back to the compressor.

When operating in the vacuum range, there is a danger of air en-

tering on the suction side. This can cause chemical reactions, a

pressure rise in the condenser and an elevated compressed-gas

temperature. Prevent the ingress of air at all costs!

INFO For recharging, we recommend the above oil types. See Chapter

6.6.

Maximum admissible

operating pressure (g)

(LP/HP)1): 19/28 bar

1) LP = Low pressure

HP = High pressure

4|Compressor assembly

4.1 Setting up

4.2 Maximum permissible inclination

Amax. 30°,

max. 2 minutes

amax. 15°,

continuous

operation

Fig. 4

 Transportandsuspensionunitonbotheyebolts(Fig.4).

Fig. 5

INFO Newcompressorsarefactory-lledwithinertgas.Leavethisser-

vice charge in the compressor for as long as possible and prevent

the ingress of air.

Check the compressor for transport damage before starting any

work.

ATTENTION Poor lubrication can damage the compressor. Respect the stated

values.

WARNING Movecompressorsonlywithhoiststhathaveadequateload-bear-

ing capacity.

Storage at (-40°C) - (+100°C), maximum permissible relative humidity 10% - 95%, no

condensation.

 Fittings (e.g. pipe holders, additional units etc.) on the compressor are permissible only

following consultation with Bock.

 Setuponanevensurfaceorframewithsufcientload-bearingcapacity.Useall4fastening

points.

Correct setup of the compressor and mounting of the belt drive are decisive for running comfort,

operating safety and the service life of the compressor.

10 | AQ453354265896en-000201 © Danfoss | Climate Solutions | 2023.07

4|Compressor assembly

 During operation with capacity controllers (Accessories, Chap. 7), the changing load can cause

increased running noises and belt drive vibrations.

4.3 V-belt drive

4.5 Electromagnetic clutch assembly

The following description applies for an electromagnetic clutch secured to a shaft.

To absorb the magnetic eld of the electromagnetic clutch, the front bearing ange has

asnugt148h8(seeFig.7).

Toconnectthemagneticeld,loosenthe4cheeseheadscrewsM8onthebearingange

(seeFig.7).

Slidethemagneticeldtoasnugtandre-attachusingthefourcheeseheadscrewsM8

(Fig.8).Screwtorque=37Nm.

Further assembly of the electromagnetic clutch according to the clutch manufacturer.

Fig. 7

Bearingange,front

Magneticeld

Fig. 8

148 h8

4.4 Main bearing load

To prevent the belt drive overloading the compressor main bearing,

ensure that:

The engagement force applied by the belt tension (centre of

shafttaper,seeFig.10)mustnotexceedFmax per. = 2750 N.

If the force engagement point shifts to the right (see Fig.6,

smallpoint),theforceFmax per. reduces as per the following

formula:

Fmax per. = 245 kNmm

(90mm+L1[mm])

Fmax= 2750 N

Mbmax= 245kNmm

(mm)

Fig. 6

ATTENTION Inappropriately designed belt drives, especially belt knocking

(offsets, inclinations) or excessive tensioning forces can cause

compressor damage! Make sure that the drive belt is designed

correctly,e.g.byusingtensionersandselectingthebeltproleand

the belt length.

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