Danfoss scroll DSH Medium - GB - SI User guide

Brand: Danfoss

Model: scroll DSH Medium - GB - SI

Type: User guide

Danfoss scroll compressors

DSH 090-184

50 Hz - 60 Hz - R410A

Application guidelines

http://cc.danfoss.com

PRELIMINARY

Content

GENERAL INFORMATION ........................ 4

PRODUCT INFORMATION ....................... 5

Features..................................................... 5

Overview ......................................................................5

How do IDVs work? ................................................... 5

Compressor model designation ............. 6

Nomenclature ............................................................6

Technical specications ........................... 7

50-60 Hz data .............................................................7

Dimensions ............................................... 8

Single compressors ..................................................8

Electrical data, connections and wiring . 9

Motor voltage .............................................................9

Wiring connections ..................................................9

IP rating .......................................................................10

Three phase electrical characteristics .............10

Motor protection.....................................................11

Approval and certicates ...................... 12

Low voltage directive ............................................12

Machines directive .................................................12

Pressure Equipment ...............................................12

Internal free volume...............................................12

SYSTEM DESIGN ..................................... 13

Design piping ......................................... 13

General requirements ...........................................13

Design compressor mounting .............. 14

General requirements ...........................................14

Single requirements...............................................14

Manage oil in the circuit ........................ 15

Requirement .............................................................15

Evaluate the risk .......................................................15

Test, criteria and solutions ...................................15

Manage sound and vibration ................ 16

Compressor sound radiation ..............................16

Mechanical vibrations ...........................................17

Gas pulsation ............................................................17

Manage operating envelope ................. 18

Requirement .............................................................18

Evaluate the risk .......................................................19

Test, criteria and solutions ...................................19

Manage superheat ................................. 20

Requirement ............................................................ 20

Evaluate the risk ...................................................... 20

Test, criteria and solutions ...................................21

Manage o cycle migration ................... 22

Requirement ............................................................ 22

Evaluate the risk ...................................................... 22

Test, criteria and solutions .................................. 22

Provide power supply and electrical

protection ............................................... 23

Wiring information ................................................ 23

Soft starts .................................................................. 24

Control logic ........................................... 25

Safety control logic requirements ................... 25

Cycle rate limit requirements ............................ 25

Defrost logic recommendations ...................... 25

Pump-down logic recommendations ............ 26

Reduce moisture in the system ............. 27

Requirements .......................................................... 27

Solutions ................................................................... 27

INTEGRATION INTO SYSTEMS .............. 28

Assembly line procedure ....................... 28

Compressor storage .............................................. 28

Compressor holding charge .............................. 28

Handling ................................................................... 28

Piping assembly...................................................... 29

System pressure test and leak detection ...... 29

Vacuum evacuation and moisture removal 30

Refrigerant charging ............................................. 30

Dielectric strength and insulation resistance

tests ............................................................................. 30

Commissioning ....................................... 31

Preliminary check....................................................31

Initial start-up ...........................................................31

System monitoring .................................................31

ORDERING INFORMATION ................... 32

Packaging ............................................... 32

Ordering codes ....................................... 33

Accessories .............................................. 34

3FRCC.PC.037.A1.02 - part 2

PRELIMINARY

PRODUCT INFORMATIONSYSTEM DESIGNINTEGRATION INTO SYSTEMORDERING INFORMATION GENERAL INFORMATION

General Information

Danfoss scroll compressors are designed and

manufactured according to the state of the

art and to valid European and US regulations.

Particular emphasis has been placed on

safety and reliability. Related instructions are

highlighted with the following icons:

This icon indicates instructions to avoid

safety risk.

This icon indicates instructions to avoid

reliability risk.

The purpose of this guideline is to help

customers qualify compressors in the unit.

You are strongly advise to follow these

instructions. For any deviation from the

guidelines, please contact Danfoss Technical

Support. In any case, Danfoss accepts no

liability as a result of the improper integration

of the compressor into the unit by the system

manufacturer.

4 FRCC.PC.037.A1.02 - part 2

PRELIMINARY

GENERAL INFORMATIONSYSTEM DESIGNINTEGRATION INTO SYSTEMORDERING INFORMATION PRODUCT INFORMATION

DSH 090-105-120-140-161-184 scroll compressor

benet from an improved design to achieve the

highest eciency and increased life time.

Features

Danfoss Intermediate Discharge Valves (IDVs)

are located close to the discharge side of the

compressor. They reduce excessive compression

of refrigerant under part-load conditions while

maintaining the same cooling capacity. The IDVs

open when discharge pressure falls below the

built-in optimization point. They adapt the eort

of the motor to the varying load and pressure

conditions in the system, thus reducing the eort

of the motor and its electrical consumption

and improving the system’s seasonal energy

eciency.

How do IDVs work?

Intermediate discharge valves (IDVs)

increase seasonal eciency

Heat shield lowers the heat transfer

between discharge and suction gas

and the acoustic level

New PTFE spring seal for even lower

leaks

R410A optimized and dedicated

scroll prole

Lead free polymer bearings improve

behavior under poor lubrication

conditions

Patented motor cap

Improved lower bearing centring

Patented motor centring spacer

Overview

5FRCC.PC.037.A1.02 - part 2

PRELIMINARY

GENERAL INFORMATIONSYSTEM DESIGNINTEGRATION INTO SYSTEMORDERING INFORMATION PRODUCT INFORMATION

Compressor model designation

Danfoss scroll compressor DSH for R410A is

available as single compressor and can be

assembled in tandem or trio combinations.

The example below presents the compressor

nomenclature which equals the technical

reference as shown on the compressor

nameplate. Code numbers for ordering are listed

in section “Ordering information”.

Nomenclature

Family, lubricant

& refrigerant

DSH: Scroll, POE lubricant,

for R410A 60 Hz

Motor protection

A: Electronic module, 24V AC

B: Electronic module, 110-240V

L: Internal overload protector

Suction and discharge connections

A: Brazed connections

Family,

lubricant

& refrigerant

Nominal

capacity

Approvals Voltage Version Evolution

index

Evolution index

A~Z

A4DSH AAB184

Motor voltage code

3: 200-230V/3~/60 Hz

4: 380-415V/3~/50 Hz - 460V/3~/60 Hz

7: 500V/3~/50 Hz - 575V/3~/60 Hz

9: 380V/3~/60 Hz

UL index

Nominal capacity

in thousand Btu/h at 60 Hz, R410A,

ARI conditions

6 FRCC.PC.037.A1.02 - part 2

PRELIMINARY

GENERAL INFORMATIONSYSTEM DESIGNINTEGRATION INTO SYSTEMORDERING INFORMATION PRODUCT INFORMATION

Technical specications

50-60 Hz data

Model

Nominal

tons 60 Hz

Nominal cooling

capacity

Power

input

COP E.E.R.

Swept

volume

Displace-

ment 

Oil charge

Net weight



TR W Btu/h kW W/W Btu/h/W cm

/rev m

/h dm

50 Hz

DSH090 7.5 22500 76770 7.22 3.12 10.64 88.40 15.4 3.0 58.0

DSH105 9 26500 90420 8.40 3.15 10.75 103.50 18.0 3.3 64.0

DSH120 10 30100 102710 9.44 3.18 10.86 116.90 20.3 3.3 64.0

DSH140 12 34100 116350 10.56 3.23 11.02 133.00 23.1 3.3 67.0

DSH161 13 39000 133100 12.15 3.21 10.95 151.70 26.4 3.3 69.0

DSH184 15 44000 150140 13.68 3.21 10.97 170.30 29.6 3.6 71.5

60 Hz

DSH090 7.5 27500 93830 8.56 3.21 10.96 88.40 18.6 3.0 58.0

DSH105 9 32300 110140 10.02 3.22 11.00 103.50 21.8 3.3 64.0

DSH120 10 36700 125230 11.25 3.26 11.11 116.9 0 24.6 3.3 64.0

DSH140 12 41700 142290 12.65 3.29 11.24 133.00 27.9 3.3 67.0

DSH161 13 47400 161740 14.57 3.26 11.11 151.70 31.9 3.3 69.0

DSH184 15 53400 182210 16.45 3.24 11.07 170.30 35.8 3.6 71.5



Displacement at nominal speed: 2900 rpm at 50 Hz, 3500 rpm at 60 Hz

 Net weight with oil charge

TR: Ton of Refrigeration, Standard rating conditions: ARI standard Evaporating temperature: 7.2 °C Superheat: 11.1 K

EER: Energy Eciency Ratio Refrigerant: R410A Condensing temperature: 54.4 °C Subcooling: 8.3 K

COP: Coecient Of Performance,

Subject to modication without prior notication.

Data given for motor code 4 compressor, for full data details and capacity tables refer to Coolselector®2

www.coolselector.danfoss.com

7FRCC.PC.037.A1.02 - part 2

PRELIMINARY

GENERAL INFORMATIONSYSTEM DESIGNINTEGRATION INTO SYSTEMORDERING INFORMATION PRODUCT INFORMATION

Dimensions

Compressor model D (mm) H (mm) H1(mm) H2(mm) L1(mm) L2(mm) L3(mm) Outline drawing number

DSH090 224 470 220 436 180 230 230 8560004

DSH105-120-140-161 224 527 262 494

180*

200**

230 230 8560003

DSH184 234 543 284 509 200 230 230 8560023

* compressor motor codes 4, 7, 9

** compressor motor code 3

Single compressors

Ø D

4 x holes

Ø19.05

190.5

30°

Ø D

4 x holes

Ø19.05

190.5

30°

8 FRCC.PC.037.A1.02 - part 2

PRELIMINARY

GENERAL INFORMATIONSYSTEM DESIGNINTEGRATION INTO SYSTEMORDERING INFORMATION PRODUCT INFORMATION

Electrical data, connections and wiring

Danfoss scroll compressors DSH are available in four dierent motor voltages as listed below.

Electrical power is connected to the compressor

terminals by Ø 4.8 mm (3/16") screws.

The maximum tightening torque is 3 Nm. Use a

1/4" ring terminal on the power leads.

Motor voltage

Wiring connections

DSH090-105-120-140-161

*except DSH140-161 code3

DSH140-161 code3 &

DSH184

The terminal box is provided with a Ø 25.5 mm

(ISO25) and a Ø 29 mm (PG21) knockouts.

The terminal box is provided with a Ø 40.5 mm

hold (ISO40) for power supply and a Ø 16.5 mm

knockout (ISO16).

Motor voltage code Code 3 Code 4 Code 7 Code 9

50 Hz

Nominal voltage - 380-415 V - 3 ph - -

Voltage range - 342-457 V - -

60 Hz

Nominal voltage 200-230 V - 3 ph 460V - 3 ph 575 V - 3 ph 380-400 V - 3 ph

Voltage range 180-253 V 414-506 V 517-632 V 340-440 V

Vavg = Mean voltage of phases 1, 2, 3.

V1-2 = Voltage between phases 1 and 2.

V1-3 = Voltage between phases 1 and 3.

V2-3 = Voltage between phases 2 and 3.

2 x Vavg

% voltage

imbalance

= x 100

The maximum allowable voltage imbalance is

2%. Voltage imbalance causes high amperage

over one or several phases, which in turn leads to

overheating and possible motor damage. Voltage

imbalance is given by the formula:

Terminal box

Ø 25.5 mm knockout

Power supply

Ø 29 mm knockout

Ø 40.5 mm hole

Ø 16.5 mm

knockout

Power supply

9FRCC.PC.037.A1.02 - part 2

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GENERAL INFORMATIONSYSTEM DESIGNINTEGRATION INTO SYSTEMORDERING INFORMATION PRODUCT INFORMATION

Electrical data, connections and wiring

IP rating

The compressor terminal box according to IEC529 is IP54 for all models when correctly sized IP54 rated

cable glands are used.

First numeral, level of protection against contact and foreign objects

5 - Dust protected

Second numeral, level of protection against water

4 - Protection against water splashing

Three phase electrical

characteristics

Compressor model

LRA MCC Max. operating current Winding resistance

A A A Ω

Motor voltage code 3

200-230 V / 3ph / 60 Hz

DSH090 203 43 38 0.39

DSH105 267 46 45 0.27

DSH120 267 61 48 0.27

DSH140 304 64 56 0.24

DSH161 315 69 64 0.22

DSH184 351 75 71 0.22

Motor voltage code 4

380-415 V / 3ph / 50 Hz

460 V / 3ph / 60Hz

DSH090 98 22 19 1.47

DSH105 142 25 22 1.05

DSH120 142 29 24 1.05

DSH140 147 30 28 0.92

DSH161 158 35 31 0.83

DSH184 197 38.6 36 0.83

Motor voltage code 7

575 V / 3 ph / 60 Hz

DSH090 84 18 14 2.34

DSH105 103 22 17 1.57

DSH120 103 24 19 1.57

DSH140 122 26 22 1.38

DSH161 136 29 24 1.32

DSH184 135 35 28 1.32

Motor voltage code 9

380-400 V / 3ph / 60 Hz

DSH090 124 26 23 1.05

DSH105 160 32 26 0.72

DSH120 160 35 29 0.72

DSH140 168 37 33 0.62

DSH161 177 41 37 0.57

DSH184 239 51 41 0.57

The MCC is the current at which the motor

protection trips under maximum load and

low voltage conditions. This MCC value is the

maximum at which the compressor can be

operated in transient conditions and out of

the application envelope. Above this value, the

internal motor protection or external electronic

module will cut-out the compressor to protect

the motor.

Locked Rotor Amp value is the higher average

current as measured on mechanically blocked

compressors tested under nominal voltage. The

LRA value can be used as a rough estimation for

the starting current. However, in most cases, the

real starting current will be lower. A soft starter

can be applied to reduce starting current (see

section

“soft start“).

MCC (Maximum Continuous

Current)

LRA (Locked Rotor Amp)

10 FRCC.PC.037.A1.02 - part 2

PRELIMINARY

GENERAL INFORMATIONSYSTEM DESIGNINTEGRATION INTO SYSTEMORDERING INFORMATION PRODUCT INFORMATION

Motor protection

Compressor models DSH 090 to 184 are

provided with internal overload motor

protection to prevent against excessive current

and temperature caused by overloading, low

refrigerant ow or phase loss. The cutout current

is the MCC value listed in table “Three phase

electrical characteristics”.

The protector is located in star point of motor

and, should it be activated, will cut out all three

phases. It will be reset automatically.

While not compulsory, an additional external

overload is still advisable for either alarm or

manual reset.

Then it must be set below MCC value (at max

operating current):

• When the motor temperature is too high, then

the internal protector will trip.

• When the current is too high the external

overload protection will trip before the internal

protection therefore oering possibility of

manual reset.

Electrical data, connections and wiring

Winding resistance is the resistance between

phases at 25°C (resistance value +/- 7%).

Winding resistance is generally low and it

requires adapted tools for precise measurement.

Use a digital ohm-meter, a "4 wires" method and

measure under stabilised ambient temperature.

Winding resistance varies strongly with winding

temperature. If the compressor is stabilised

at a dierent value than 25°C, the measured

resistance must be corrected using the following

formula:

a + t

amb

tamb

= R

25°C

_______

a + t

25°C

: reference temperature = 25°C

amb

: temperature during measurement (°C)

25°C

: winding resistance at 25°C

amb

: winding resistance at tamb

Coecient a = 234.5

The max. operating current is the current when

the compressors operate at maximum load

conditions and 10% below nominal voltage (max.

evaporating temperature and max. condensing

temperature). Max Oper. A can be used to select

cables and contactors. In normal operation, the

compressor current consumption is always less

than the Max Oper. A. value.

Winding resistance

Max. operating Current

Phase sequence and reverse

rotation protection

Use a phase meter to establish the phase

orders and connect line phases L1, L2 and L3 to

terminals T1, T2 and T3, respectively.

Compressor models DSH 090 to 184 incorporates

an internal reverse vent valve which will react

when the compressor is run in reverse and

will allow refrigerant to circulate through a

by-pass from the suction to the discharge.

Although reverse rotation is not destructive for

these models, it should be corrected as soon

as possible. Repeated reverse rotation over 24

hours may have negative impact on the bearings.

Reverse rotation will be obvious to the user as

soon as power is turned on: the compressor will

not build up pressure, the sound level will be

abnormally high and power consumption will be

minimal. If reverse rotation symptoms occur, shut

the compressor down and connect the phases

to their proper terminals. If reverse rotation is

not halted, the compressor will cycle o-on the

motor protection.

11FRCC.PC.037.A1.02 - part 2

PRELIMINARY

GENERAL INFORMATIONSYSTEM DESIGNINTEGRATION INTO SYSTEMORDERING INFORMATION PRODUCT INFORMATION

Approval and certicates

DSH scroll compressors comply with the

following approvals and certicates.

www.commercialcompressors.danfoss.com/

documentation/certicates/

Pressure Equipment

Machines directive

2006/42/EC

Low voltage directive

Internal free volume

Directive 97/23/EC

2006/95/EC

CE 0062 or CE 0038 or CE0871

(European Directive)

All DSH models

(Underwriters Laboratories)

All DSH models

Other approvals / certicates Contact Danfoss

Products DSH090-105-120-140-161-184

Manufacturer’s declaration of incorporation ref.

Machines Directive 2006/42/EC

Contact Danfoss

Products DSH090-105-120-140-161-184

Declaration of conformity

ref. Low voltage Directive 2006/95/EC

Contact Danfoss

Products Internal free volume without oil (litre)

DSH090 12.4

DSH105 14.3

DSH120 14.3

DSH140 14.3

DSH161 14.3

DSH184 14.6

Products DSH090-105-120-140-161-184

Refrigerant uids Group 2

Category PED II

Evaluation module D1

Service temperature-Ts -35°C < Ts < 55°C

Service pressure - Ps 33.3 bar(g)

Declaration of conformity Contact Danfoss

12 FRCC.PC.037.A1.02 - part 2

PRELIMINARY

GENERAL INFORMATIONPRODUCT INFORMATIONINTEGRATION INTO SYSTEMORDERING INFORMATION SYSTEM DESIGN

Design piping

General requirements Proper piping practices should be employed to:

1. Ensure adequate oil return, even under

minimum load conditions (refrigerant speed,

piping slopes…). For validation tests see section

“Manage oil in the circuit”.

2. Avoid condensed liquid refrigerant from

draining back to the compressor when stopped

(discharge piping upper loop). For validation

tests see section “Manage o cycle migration”.

General recommendations are described in the

gures below:

3. Piping should be designed with adequate

three-dimensional exibility to avoid excess

vibration. It should not be in contact with the

surrounding structure, unless a proper tubing

mount has been installed. For more information

on noise and vibration, see section on: “Sound

and vibration management”.

4 m/s or more

0.5% slope

To condenser

max. 4 m

0.5% slope

U-trap, as short as possible

4m/s or more

U trap, as short as possible

Evaporator

8 to 12 m/s

Condenser

3D exibility

Upper loop

13FRCC.PC.037.A1.02 - part 2

PRELIMINARY

GENERAL INFORMATIONPRODUCT INFORMATIONINTEGRATION INTO SYSTEMORDERING INFORMATION SYSTEM DESIGN

Design compressor mounting

General requirements

Single requirements

Compressors used in single applications must be

mounted with exible grommets

During operation, the maximum inclination from

the vertical plane must not exceed 3 degrees.

Compressors DSH090-105-120-140-161-184

come delivered with rubber grommets and

metal sleeve liners that serve to isolated the

compressor from the base frame.

The grommets must be compressed until contact

between the at washer and the steel mounting

sleeve is established. The required bolt size for

the DSH090-105-120-140-161-184 compressors is

HM8-40. This bolt must be tightened to a torque

of 15 Nm.

15 mm

HM 8 bolt

Lock washer

Flat washer

Steel mounting

sleeve

Rubber grommet

Nut

Tightening torque 15 Nm

14 FRCC.PC.037.A1.02 - part 2

PRELIMINARY

GENERAL INFORMATIONPRODUCT INFORMATIONINTEGRATION INTO SYSTEMORDERING INFORMATION SYSTEM DESIGN

Test N° Purpose Test condition Pass criteria Solutions

Check proper

oil return

Minimum load condition (A)

Compressors running 6 hours.

Oil level must be visible or full in the

sight glass when the compressor is

running and when all compressors

of the circuit are stopped.

1. Top-up with oil, generally 3% of

the total system refrigerant charge

(in weight). Above 3% look for

potential oil trap in the system.

2 Oil separator can be added.

Oil return in

split systems

Since each installation is unique,

test 1 can not fully validate the oil

return. Oil level must be checked

and adjusted at commissioning.

Oil level must be visible or full in the

sight glass when the compressor is

running and when all compressors

of the circuit are stopped.

1. Pay special attention to “Piping

design”

2. Oil separator is strongly

recommended, espacially in case of

part load.

Manage oil in the circuit

Requirement

Evaluate the risk

Test, criteria and solutions

Oil level must be visible or full in the sight

glass when the compressor is running and when

all compressors of the circuit are stopped.

Single compressor

Non split Test N°1

Split Test N°1+2

15FRCC.PC.037.A1.02 - part 2

PRELIMINARY

GENERAL INFORMATIONPRODUCT INFORMATIONINTEGRATION INTO SYSTEMORDERING INFORMATION SYSTEM DESIGN

Manage sound and vibration

Typical sounds and vibrations in systems can be

broken down into the following three categories:

• Sound radiation (through air)

• Mechanical vibrations (through parts and

structure)

• Gas pulsation (through refrigerant)

The following sections focus on the causes and

methods of mitigation for each of the above

sources.

Compressor sound

radiation

For sound radiating from the compressors,

the emission path is air and the sound waves

are travelling directly from the machine in all

directions.

Sound levels are as follows:

• For compressors running alone:

Compressor model

50 Hz 60 Hz

Acoustic hood

code number

Sound power

dB(A)

Attenuation

dBA 

Sound power

dB(A)

Attenuation

dBA 

DSH090 70 6 72 6 120Z0034

DSH105 71.5 6 74 6 102Z0035

DSH120 72.5 6 75 6 120Z0035

DSH140 * 72.5 6 76 6 120Z0035

DSH161 * 73.5 6 77 6 120Z0035

DSH184 75 6 78 6 120Z0135

Sound power and attenuation are given at ARI conditions, measured in free space

* For DSH140 code 3 and DSH161 code 3 use acoustic hood reference 120Z0135

 Attenuation given with acoustic hood only

Note: During compressor shut down, a short

reverse rotation sound is generated. The duration

of this sound depends on the pressure dierence

at shut down and should be less than 3 seconds.

This phenomenon has no impact on compressor

reliability.

Mitigations methods:

We can consider two means to reduce

compressors sound radiations:

1. Acoustic hoods are quick and easy to install

and do not increase the overall size of the

compressors. Acoustic hoods are available from

Danfoss as accessories. Refer to the table above

for sound levels, attenuation and code numbers.

2. Use of sound-insulation materials on the inside

of unit panels is also an eective means to reduce

radiation.

16 FRCC.PC.037.A1.02 - part 2

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Manage sound and vibration

Mechanical vibrations

Gas pulsation

A compressor generates some vibrations that

propagate into the surrounding parts and

structure. The vibration level of a DSH090 to

DSH184 compressor alone does not exceed

120 µm peak to peak. However, when system

structure natural frequencies are close to running

frequency, vibrations are amplied due to

resonance phenomenon.

A high vibration level is damageable for piping

reliability and generates high sound levels.

Mitigations methods:

1. Danfoss DSH scroll compressors are designed

to produce minimal vibration during operations.

To ensure minimum vibrations transmission

to the structure, strictly follow mounting

requirements (mounting feet, rails etc..). For

further information on mounting requirements,

please refer to the § mounting assembly.

2. Ensure that there is no direct contact (without

insulation) between vibrating components and

structure.

3. To avoid resonance phenomenon, pipings and

frame must have natural frequencies as far as

possible from running frequencies(50 or 60Hz).

Solutions to change natural frequencies are to

work on structure stiness and mass (brackets,

metal sheet thickness or shape…)

The Danfoss scroll compressor DSH has been

designed and tested to ensure that gas pulsation

is optimize for the most commonly encountered

air conditioning pressure ratio. Manifolded

compressors are equivalents to lagged sources

of gas pulsation. Therefore, pulse level can vary

during time.

Mitigations methods:

If an unacceptable level is identied, a discharge

muer with the appropriate resonant volume

and mass can be installed.

17FRCC.PC.037.A1.02 - part 2

PRELIMINARY

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Manage operating envelope

Requirement

The operating envelope for DSH scroll

compressors is given in the gures below and

guarantees reliable operations of the compressor

for steady-state and transient operation.

Steady-state operation envelope is valid for a

suction superheat within 5K to 30K range.

DSH090 – 184 operating envelope is showed below:

Condensing temperature (°C)

Evaporating temperature (°C)

-40

-25

-20

-15

-10

-5

-35 -30 -25 -20 -15 -10 -5 0 5 10 15 20 25 30 35 40 45 50 55

S.H. = 5 K

S.H. = 30 K

Area 1: Continuous running SH 5 to 30K

Area 2: for start only: 1 min.30sec/start

Area 3 for start only: 8sec./start

Area 4: outside map

Area 1+2+3: Start/restart map

Pressure settings R410A

Working range high side bar(g) 9.9-44.5

Working range low side bar(g) 1.7-15.5

Maximum high pressure safety switch setting* bar(g) 45

Minimum low pressure safety switch setting bar(g) 1.5

Minimum low pressure pump-down switch setting** bar(g) 1.7

*Maximum allowable pressure on high pressure side according to PED regulation.

**Recommended pump-down switch settings: 1.5 bar below nominal evap. Pressure with minimum of 1.7bar(g)

18 FRCC.PC.037.A1.02 - part 2

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GENERAL INFORMATIONPRODUCT INFORMATIONINTEGRATION INTO SYSTEMORDERING INFORMATION SYSTEM DESIGN

Manage operating envelope

LP and HP safety switches must never

be bypassed nor delayed and must stop all the

compressors.

When caused low by LP safety switch, limit the

number of auto-restart to maximum 5 times

within 12 hours.

HP safety switch must be manual reset

Depending on application operating envelope,

you must dene HP and LP limits within

operating envelope and pressure setting table

above.

For DSH090-105-120-140-161-184 compressors,

the external Discharge Gas Temperature

protection (DGT) is required if the high and

low pressure switch settings do not protect

the compressor against operations beyond its

specic application envelope.

The discharge gas thermostat accessory kit (code

7750009) includes all components required

for installation as shown on the right. DGT

installation must respect below requirements:

• The thermostat must be attached to the

discharge line within 150 mm from the

compressor discharge port and must be

thermally insulated and tightly xed on the

pipe.

• The DGT should be set to open at a discharge

gas temperature of 135°C.

Evaluate the risk We consider two types of operating envelope management:

Basic:

• HP and LP switch

• MOP (Max Operating Pressure) ensured by expansion

device

• Condensing pressure control

• DGT

Advanced:

• HP and LP sensor

• Operating envelope limits (permanent and transient)

integrated into control logic

• DGT

See “Test, criteria and solutions” No additional test are required

HP switch setting

MOP + test N

LP switch setting

Condensing pressure control

DGT (integrated)

tests N

1 and 2

Discharge line

Insulation

Bracket

Thermostat

Test, criteria and solutions

Test N° Purpose Test condition Pass criteria Solutions

Check that Area

1 is reached

within maximum

transient time

Start test at minimum foreseeable

evaporating temperature (minimum

ambient temerature...)

Reach Area 1 within maximum

transient time

Work on compressor staging, fan

staging, water ow etc...

Perform a defrost test if reversible

unit

Perform a start-up test at maximum

foreseeable evaporating temperature

(max ambient temperature, or start

up with hot water…)

Improve MOP function.

Work on compressor staging,fan

staging, water ow etc...

19FRCC.PC.037.A1.02 - part 2

PRELIMINARY

GENERAL INFORMATIONPRODUCT INFORMATIONINTEGRATION INTO SYSTEMORDERING INFORMATION SYSTEM DESIGN

Manage superheat

During normal operation, refrigerant enters

the compressor as a superheated vapor. Liquid

ood back occurs when a part of the refrigerant

entering the compressor is still in liquid state.

Liquid ood back can cause oil dilution and, in

extreme situations lead to liquid slugging that

can damage compression parts.

Requirement

Evaluate the risk

In steady state conditions,

• Suction superheat must remain within 5K to 30K

• Discharge superheat must be higher than 15K

• Oil superheat must be higher than 10K

In transient conditions,

• Discharge superheat must be higher than 5K

• Oil superheat must be higher than 10K

Use the tables below in relation with the system

charge and the application to quickly evaluate

the risk and potential tests to perform.

Charge limit is dened in table below:

Discharge temperature sensor must be placed

onto the discharge tting and be insulated.

Oil temperature sensor must be placed between

oil sight glass and compressor baseplate and be

insulated.

BELOW cHargE Limit aBOVE cHargE Limit

Non reversible No test or additional safeties required Liquid ood back test

Reversible Defrost test

Liquid ood back test

Defrost test

Models

Refrigerant charge limit

(kg)

DSH Single

DSH090 5.9

DSH105 7.9

DSH120 7.9

DSH140 7.9

DSH161 7.9

DSH184 7.9

20 FRCC.PC.037.A1.02 - part 2

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Danfoss scroll DSH Medium - GB - SI User guide

Danfoss scroll DSH Medium - GB - SI User guide

Danfoss scroll DSH Medium - GB - SI User guide

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