Danfoss AKVO 10 Data sheet

Data Sheet

Electric Expansion Valve Type AKVO 10

Valve designed for refrigeration plant

AKVO 10 is an electrically operated expansion valve designed for refrigeration plant.

AKVO 10 has an internal lter.

The AKVO 10 range covers a capacity range from 0.6 – 13.5 kW (R404A/R507) and is divided in 7 capacities.

Features

• Refrigerants: R744, R22/R407C, R404A/R507, R410A, R134a, R407A, R23, R407F, R422B, R422D, R448A, R449A, R449B, R450A, R452A, R513A.

• The valve requires no adjustment

• Wide regulation range 10 – 100% of the full capacity

• Internal lter

• Both expansion valve and solenoid valve

• Wide range for coils DC and AC

For a complete list of approved refrigerants, visit www.products.danfoss.com and search for individual code numbers, where refrigerants are listed as part of technical data

AI236986442651en-000801

Electric Expansion Valve, Type AKVO 10

Functions

The valve capacity is regulated by means of pulse-width modulation. Within a period of six seconds a voltage signal from the controller will be transmitted to and removed from the valve coil. This makes the valve open and close for the ow of refrigerant.

The relation between this opening and closing time indicates the actual capacity. If there is an intense need for refrigeration, the valve will remain open for almost all six seconds of the period. If the required amount of refrigerant is modest, the valve will stay open during a fraction of the periode. The amount of refrigeration needed is determined by the controller. When no refrigeration is required, the valve will remain closed and thus function as a solenoid valve.

1234678912

Inlet

Outlet

Orice

Filter

Armature

Coated Copper gasket

Coil

DIN spades

O-ring

Description

Value

Tolerance of coil voltage

10 / - 15%

Enclosure to IEC 529

Max. IP67

Working principle

Pulse Width Modulation (PWM)

Recommended period of time

6 s.

Regulation range

10 – 100%

Connection

Solder

Evaporating temperature

-50 – 60 °C

Ambient temperature

-50 – 50 °C

Maximum Operation Pressure

Dierential (MOPD)

18 bar

Filter internal

MESH 60

Max. working pressure

28 barg

Valve type

Rated capacity kW

(1)

kv value [m3/h]

Connections Solder ODF

R22/ R407C

R134a

R404A/ R507

Inlet × outlet

[in.]

Code no.

Inlet × outlet

[in.]

Code no.

AKVO 10-1

1.0

0.9

0.8

0.010

3

⁄8

×

1

⁄2

068F4011

10 × 12

068F4012

AKVO 10-2

1.6

1.4

1.3

0.017

3

⁄8

×

1

⁄2

068F4013

10 × 12

068F4014

AKVO 10-3

2.6

2.1

2.0

0.025

3

⁄8

×

1

⁄2

068F4015

10 × 12

068F4016

AKVO 10-4

4.1

3.4

3.1

0.046

3

⁄8

×

1

⁄2

068F4017

10 × 12

068F4018

AKVO 10-5

6.4

5.3

4.9

0.064

3

⁄8

×

1

⁄2

068F4019

10 × 12

068F4020

AKVO 10-6

10.2

8.5

7.8

0.114

3

⁄8

×

1

⁄2

068F4021

10 × 12

068F4022

AKVO 10-7

16.3

13.5

12.5

0.209

1

⁄2

×

5

⁄8

068F4023

12 × 16

068F4024

Electric Expansion Valve, Type AKVO 10

Product specication

Design

Figure 1: Type AKVO 10

Technical data

Table 1: Type AKVO 10

Capacity tables

Table 2: Rated capacity and ordering

(1)

Rated capacities are based on: Condensing temperature t

=32 °C. Liquid temperature tl=28 °C. Evaporating temperature te=5 °C

c

∆p

valvepcpeΔp1Δp3Δp4

pressure drop across the valve

condensing pressure

evaporating pressure

pressure drop across the liquid line

pressure drop across the distributor system

pressure drop across the evaporator

Electric Expansion Valve, Type AKVO 10

 NOTE:

Code numbers on request. AKVO 10 is supplied as an industrial pack (16 pieces).

Spare parts

AKVO is a non serviceable valve.

Valve sizing

To obtain an expansion valve that will function correctly under dierent load conditions it is necessary to consider the following points when sizing the valve: These points must be dealt with in the following sequence:

1.

Evaporator capacity

2.

Pressure drop across the valve

3.

Correction for subcooling

4.

Correction for evaporating temperature

5.

Determination of valve size

6.

Correctly dimensioned liquid line

1. Evaporator capacity

The evaporator capacity is found in the specications from the evaporator supplier

2. Pressure drop across the valve

The pressure drop across the valve directly determines the capacity and must therefore be considered. The pressure drop across the valve is normally calculated as the condensing pressure less the evaporating pressure and sundry other pressure drops in the liquid line, distributor, evaporator, etc. It is indicated in the following formula: Δp

- (pe + Δp1 + Δp3 + Δp4)

valve

= p

c

Figure 2: Pressure drop across the valve



NOTE:

The pressure drop across the liquid line and the distributor system must be calculated on the basis of the valve’s max. capacity, as the valve operates with pulse-width modulation

Example: Calculation of pressure drop across a valve: Refrigerant: R22/R407C Condensing temperature: 35 °C (pc = 13.5 bar) Evaporating temperature: 0 – 6 °C (pe = 4.1 bar) Δp1 = 0.2 bar Δp3 = 0.8 bar Δp4 = 0.1 bar This will give the following equation: Δp

= pc - (pe + Δp1 + Δp3 + Δp4)

valve

= 13.5 - (4.1 + 0.2 + 0.8 + 0.1) = 8.3 bar The found value for “pressure drop across the valve” is used later in the section “Determination of valve size”.

Correction factor

4 K

10 K

15 K

20 K

25 K

30 K

35 K

40 K

45 K

50 K

R22/R407C

1.00

0.94

0.90

0.87

0.83

0.80

0.77

0.74

0.72

0.69

R134a

1.00

0.93

0.88

0.84

0.80

0.76

0.73

0.70

0.68

0.65

R404A/R507

1.00

0.91

0.83

0.78

0.73

0.68

0.65

0.61

0.59

0.56

Evaporating tem‐ perature te [°C]

50-10

-15

-20

-30

-40

AKVO 10

1.25

1.6

Electric Expansion Valve, Type AKVO 10

3. Correction for subcooling

The evaporator capacity used must be corrected, if the subcooling deviates from 4 K. Use the actual correction factor indicated in the table. Multiply the evaporator capacity by the correction factor to obtain the corrected capacity.

Table 3: Correction factors for subcooling Δt

sub

Corrected capacity = evaporator capacity x correction factor. The corrected capacity is used in the section “Determination of valve size”. Example of corection: Refrigerant: R22/R407C Evaporator capacity Qe: 5 kW Subcooling: 10 K Correction factor according to the table = 0.94 Corrected capacity = 5 × 0.94 = 4.7 kW.

 NOTE:

Too little subcooling may cause ash gas.

4. Correction for evaporating temperature (te)

To obtain a correctly dimensioned valve it is important that the application is considered.

Depending on the application, the valve should have an overcapacity enabling it to cope with the extra amount of refrigeration needed during certain periods, e.g. during the defrost recovery process.

The valve’s opening degree should therefore be between 50 and 75% when regulating. In this way it is ensured that the valve has a suciently wide regulation range, so that it can manage changed loads at or near the normal working point. Correction factors based on the evaporating temperature are indicated below:

Table 4: Correction factors for evaporating temperature (te)

5. Determination of valve size

When the valve size meeting the required capacity is selected it is important to note that the capacity indications are the valve’s rated capacity, i.e. when the valve is 100% open.

In this section we tell you how the valve’s size is determined.

There are three factors that have an inuence on the choice of the valve:

• The pressure drop across the valve

• The corrected capacity (correction for subcooling)

• The corrected capacity for evaporating temperature

The three factors have been described earlier in this section on dimensioning.

When these three factors have been established, the selection of the valve can be made:

• First multiply the “corrected capacity” by a value stated in the table.

• Use the new value in the capacity table in combination with the pressure drop value.

• Now select the valve size.

Example of selection of valve Use as starting point the two earlier mentioned examples, where the following two values have been obtained: Δp

= 8.3 bar

valve

Electric Expansion Valve, Type AKVO 10

Qe corrected = 4.7 kW The valve should be used in a coldroom. Consequently, 1.25 should be selected as “correction factor for the evaporating temperature”. The dimensioned capacity will then be:

1.25 x 4.7 kW = 5.88 kW. Now select a valve size from one of the capacity tables.

With the given values Δp

= 8.3 bar

valve

and a capacity of 5.88 kW, select the valve size for AKV 10-5. This valve will have a capacity of approx. 7 kW.

6. Correctly dimensioned liquid line

To obtain a correct supply of liquid to the AKVO valve, the liquid line to the individual AKVO valve must be correctly dimensioned. The liquid ow rate should not exceed 1 m/sec. This must be observed on account of the pressure drop in the liquid line (lack of subcooling) and pulsations in the liquid line.

Dimensioning of the liquid line must be based on the capacity of the valve at the pressure drop with which it is operating (cf. capacity table), and not on the evaporator capacity.

Danfoss

68F497.11.FW

Inlet

Outlet

Electric Expansion Valve, Type AKVO 10

Dimensions and weight

Figure 3: Net weight without coil:

0.38 kg

A: 64 mm / 2.52 in. B: 64 mm / 2.52 in. C: 141 mm / 5.55 in.

Voltage [V]

Frequency

[Hz]

Code no.

AKVO 10-1 to

AKVO 10-5

AKVO 10-6

AKVO 10-7

Power con‐

sumption

With 1 m 3 core cable

[IP67]

With terminal

box [IP67]

With DIN

plugs and

protective

cap [IP20]

2450018F6257

018F6707

018F6182√÷

÷

Holding:

10 W

21 VA

In rush:

44 VA

11550—

018F6711—√√÷

11560018F6260

018F6710

018F6185√√÷23050—

018F6701—√√÷

23060——018F6189√√÷24050018F6252

018F6702

018F6177√√÷24060—

018F6713—√√÷

230

50/60

018F6282

018F6732—√√÷

Voltage [V]

Frequency [Hz]

With terminal box

[IP67]

AKVO 10-1 to AKVO

10-5

AKVO 10-6

AKVO 10-7

Power consumption

2450018F6807√÷

÷

Holding:

20 W

45 VA

In rush:

60 VA

2460018F6815√÷÷110

50

018F6811√√÷110

60

018F6813√√÷230

50

018F6801√√÷230

60

018F6814√√÷240

50

018F6802√√

√

Voltage [V]

Frequency [Hz]

With terminal box

[IP67]

AKVO 10-1 to AKVO

10-5

AKVO 10-6

AKVO 10-7

Power consumption

2450018F6904√√

√

Holding:

20 W

45 VA

In rush:

60 VA

2460018F6902√√

√

230

50

018F6905√√

√

Voltage [V]

With terminal box [IP67]

AKVO 10-1 to AKVO

10-5

AKVO 10-6

AKVO 10-7

Power consumption

220

018F6851√√√20 W

230

018F6781√√√18 W

Electric Expansion Valve, Type AKVO 10

Ordering

Table 5: 10 W alternating current AC

Table 6: 12 W alternating current AC

Table 7: 20 W alternating current AC

Table 8: 18 W and 20 W direct current DC

Document name

Document type

Document topic

Approval authority

UL MH7648

Electrical - Safety Certicate

-

UL

Electric Expansion Valve, Type AKVO 10

Certicates, declarations and approvals

The list contains all certicates, declarations, and approvals for this product type. Individual code number may have some or all of these approvals, and certain local approvals may not appear on the list.

Some approvals may change over time. You can check the most current status at danfoss.com or contact your local Danfoss representative if you have any questions.

Table 9: Certicates, declarations and approvals

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Danfoss AKVO 10 Data sheet

Specifications and Main Features

Frequently Asked Questions

User Manual