Danfoss IPS 8 User guide

User Guide

Intelligent Purging System (IPS 8) Ammonia

230 V AC, 60 Hz

Info for UK customers only Danfoss Ltd. Oxford Road, UB9 4LH Denham, UK

Other IPS 8 User Guide languages

ir.danfoss.com

ir.danfoss.com148R9653

User Guide | Intelligent Purging System (IPS 8) Ammonia

Contents

Legal notice ...................................................................................................................................................................................................................3

Technical data ..............................................................................................................................................................................................................4

Ordering ..........................................................................................................................................................................................................................4

Introduction ..................................................................................................................................................................................................................5

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

Working principle .....................................................................................................................................................................................................6

Working cycle ..............................................................................................................................................................................................................7

Air traps ............................................................................................................................................................................................................................8

Connection locations ..............................................................................................................................................................................................9

Connection points ................................................................................................................................................................................................. 11

Installation ..................................................................................................................................................................................................................12

Electrical wiring ...................................................................................................................................................................................................... 14

Light Indicators ........................................................................................................................................................................................................ 16

Quick Startup ............................................................................................................................................................................................................ 17

General display.........................................................................................................................................................................................................17

Conﬁguring using the LCD ...............................................................................................................................................................................18

Modbus RTU .............................................................................................................................................................................................................. 20

Maintenance/Service/Disposal ......................................................................................................................................................................27

2 | BC344024774466en-000401

User Guide | Intelligent Purging System (IPS 8) Ammonia

Legal notice This product information is a part of the documentation for the Danfoss scope of delivery and serves

as product presentation and customer advisory service. It contains important information and technical data regarding the product.

This product information should be supplemented with the information about the industrial safety and health related regulations at the site of installation of the product. The regulations vary from place to place as a result of the statutory regulations applicable at the site of installation and are therefore not considered in this product information.

In addition to this product information and the accident prevention regulations applicable for the respective country and area where the product is used, the technical regulations for safe and professional work must also be observed.

This product information has been written in good faith. However, Danfoss cannot be held responsible for any errors that this document may contain or for their consequences.

Danfoss reserves the right to make technical changes during the course of further development of the equipment covered by this product information.

Illustrations and drawings in this product information are simpliﬁed representations. As a result of the improvements and changes, it is possible that the illustrations do not exactly match the current development status. The technical data and dimensions are subject to change. No claims will be accepted on the basis of them.

Danfoss A/S

6430 Nordborg

Denmark

CVR nr.: 20 16 57 15

Telephone: +45 7488 2222 Fax: +45 7449 0949

EU DECLARATION OF CONFORMITY

declares under our sole responsibility that the

Product category: Intelligent Purger System (Air Purger)

Type designation(s): IPS 8

Covered by this declaration is in conformity with the following directive(s), standard(s) or other normative document(s), provided that the product is used in accordance with our instructions.

Machine Directive 2006/42/EC

EN 378-2:2016 Refrigerating systems and heat pumps - Safety and environmental requirements - Part 2: Design, construction, testing, marking and documentation

IEC 60204-1:2018 Safety requirements for electrical equipment for measurement, control and laboratory use - Part 1: General requirements

Pressure Equipment Directive 2014/68/EU (PED)

EN 378-2:2016 Refrigerating systems and heat pumps - Safety and environmental requirements - Part 2: Design, construction, testing, marking and documentation

Ammonia side (R717): Category A4P3. Fluid group: 1. PS = 40 bar. TS: -40 C to 60 C R452A side: Category 1. Fluid group: 2. PS = 28 bar. TS: -40 C to 60 C

Ambient temperature: -10 C to 43 C

Electromagnetic Compatibility Directive 2014/30/EU (EMC)

IEC 61000-6-2 Electromagnetic compatibility (EMC) - Part 6-2: Generic standards - Immunity standard for industrial environments (IEC77/488/CDV:2015)

EN 61000-6-4 Electromagnetic compatibiliy (EMC) - Part 6-4: Generic standards - Emission standard for industrial environments

Note: EMC test performed with cable length < 30m.

Date: YYYY.MM.DD Place of issue:

Signature:

Danfoss only vouches for the correctness of the English version of this declaration. In the event of the declaration being translated into any other language, the translator concerned shall be liable for the correctness of the translation

ID No: 084R9456

This doc. is managed by 500B0577

Issued by

Name: Su Cheong Ho

Title: Lead Design Engineer

Refrigeration & Air Conditioning Controls

Revision No: AA

Danfoss A/S

Date: YYYY.MM.DD Place of issue:

Signature:

Approved by

Name: Behzad Parastar

Title: Product Manager

Page

1 of

1

BC344024774466en-000401 | 3

User Guide | Intelligent Purging System (IPS 8) Ammonia

Technical data

Ordering

Supply voltage 230V AC, 1ph, 60Hz

Current 5.7 A (max. 6.5 A)

Power consumption max. 1.3 kW

Short-circuit current rating Icc 10kA

Temperature range ambient -10 °C to +43 °C (14 °F to 109 °F)

Temperature range transport/storage -30 °C to +60 °C (-22 °F to 140 °F)

Enclosure IP55

Weight max. 100 kg (221 lbs)

Dimensions (LxWxH) 1051 x 441 x 703 mm (41.4 x 17.4 x 27.7 inches)

Purger refrigerant R452A 900 gram (31.7 oz)

Max. operating pressure (PS) R452A 28 bar (406 psi)

System refrigerant R717

Min. operating pressure R717 6.5 bar (94 psi)

Max. operating pressure R717 40 bar (580 psi)

Operating temperature R717 -40 °C to +60 °C (-40 °F to 140 °F)

Unit

Danfoss Intelligent Purging System IPS 8 60Hz unit 084H5002

Accessories/Spare parts Accessory Spare part Code

Flange blind blank incl Bolts, nuts and Gaskets* x 084H5053

SV3 Float Valve x 027B2023

ICF 15-4 solenoid, DIN Butt weld 15mm ½ inch x 027L4543

ICF 15-4 solenoid, ANSI Socket weld 15mm ½ inch x 027L4538

ICF 15-4 solenoid, ANSI Butt weld 15mm ½ inch x 027L4602

Welding Flange incl Bolts, nuts and Gaskets x 084H5061

Purger solenoid kit (Armature, tube, Sealing, Oriﬁce, Filter insert) x 084H5051

Solenoid coil, 24V DC for AKV x x 018F6757

PSU, 24V DC - optional for powering purge points x x 080Z0055

Restrictor, purge line x 084H5054

Compressor Cranck case heater x 084H5058

Condenser coil assy incl screws x 084H5059

Fan motor for condenser Incl fan grid and screws x 084H5060

Extraction Fan x 084H5056

Air grid with ﬁlter (1 piece) x 084H5057

Pre-programmed MCX 15 x 084H5052

Pressure transmitter evaporator, soldered (AKS 32R) x 060G3552

Compressor including Start relay box and Start and Run Capacitor x 123B2156

Compressor Hi-temp sensor x 084N2003

Expansion valve, R452A x 068U3881

Sight glass x 014-0191

Pressure transmitter - R717, Threaded, AKS2050 x 060G5750

Thermostat for crankcase heater control x 060L111166

Temperature sensor - R717, AKS 21M x 084N2003

Pressure switch for Fan x Contact Danfoss

Pressure safety switch x Contact Danfoss

* For closing system ﬂange during system pressure testing

Code number

4 | BC344024774466en-000401

Note:

All Spare part items are parts already built into the IPS 8 All accessories are not.

User Guide | Intelligent Purging System (IPS 8) Ammonia

Introduction

The Danfoss Intelligent Purging System (IPS 8) is a stand-alone, self-contained purging unit designed to remove non-condensable gases (NC gases = air and other unwanted foreign gases) from industrial ammonia refrigeration systems.

The IPS control can handle up to 8 purge points automatically.

The ingress of NC gases into a refrigeration system is inevitable, regardless of the refrigerant, pressures, or temperatures. NC gases in the system will result in a decrease in system eﬃciency, both in terms of an increase in power consumption and reduced cooling capacity.

Due to having a diﬀerent density than ammonia, the ingressed air will accumulate in speciﬁc areas of the system, where it can be removed using the Danfoss IPS 8. The accumulation areas are identiﬁed in the Connection locations section, along with recommended connection principles.

The purger unit is an electronically controlled, self-contained R452A refrigerant system that runs

independent of the main ammonia system and with only one ﬂange connection to the ammonia plant.

The ﬂanged opening allows the ammonia gas/ NC gas mix access to the purger’s heat exchanger, where it is split into ammonia condensate and NC gases. The ammonia condensate is returned by gravity to the main plant, while the NC gases are purged to the atmosphere through e.g. a water bath.

Through the ﬂanged opening, the purger unit has access to the parameters from the ammonia plant required for full electronic control.

The unit runs automatically in 24-hour cycles, checking for the presence of NC gases and, if present, removes the NC gases.

To regain and retain the design capacity of the main ammonia system and prevent future air accumulation, it is highly recommended to install the Danfoss IPS 8.

Features

• State-of-the-art electronically controlled unit based on the Danfoss MCX controller platform

• Reduced power consumption of the ammonia plant

• Automatic purging response to NC gases in the refrigeration system

• Continuous and smart monitoring of diﬀerential pressure between the system refrigerant and the purger’s refrigerant

• Smart purging that minimizes refrigerant (ammonia) release to the environment

• Self-contained unit operation, which functions independently from the main plant

• An operation log for easy purging cycle data monitoring

• Industry standard Modbus RTU communication for remote monitoring and system integration

• Reduced purging unit power consumption compared to other units due to on-demand operation only

• Self-diagnostics for both unit and system operation to shut down in the event of malfunctions

• Cost-eﬀective installation with few mechanical and electrical connections

• A fully brazed and leak-tested R452A cooling system, minimizing leakage risks

• A plug-and-play stand-alone design, which simpliﬁes installation and commissioning while reducing potential errors

• No need for advanced settings

• A compact and easy-to-handle design

• Patent pending on IPS 8

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User Guide | Intelligent Purging System (IPS 8) Ammonia

13

Working principle The Danfoss IPS 8 is factory-tested and ready to

use in ammonia plants with a condenser pressure of more than 6,5 bar (94 psi). The purger is charged with 900 gram (31.7 oz) of R452A.

Only 2 mechanical connections are needed for the purger (see ﬁg. 1). The ﬂow of ammonia/NC gases from the main plant is done through the ﬂange for ammonia (see 13 in Fig. 1 below), while the NC gas purge is done through the blow-oﬀ pipe after the purge restrictor (18).

Through the ﬂange for ammonia (13), a mixture of ammonia gas and NC gases enters the heat exchanger (12) part of the purger.

The ammonia gas/NC gas mix is cooled down below the condensing temperature of the ammonia by the R452A circuit. At this point, ammonia gas condenses and returns by gravity to the ammonia plant whereas the NC gases accumulate in the heat exchanger (12) for subsequent purging.

7

By condensing the ammonia gas, a new ammonia/NC gases mix is naturally pulled through. This new mix is separated through a continuous process.

As the NC gas concentration in the heat exchanger (12) increases, the R452A heat exchanger pressure and temperature will simultaneously decrease.

The controller continuously monitors the R452A heat exchanger pressure as well as ammonia pressure and temperature. When the R452A pressure reaches a predeﬁned pressure diﬀerence when compared with the ammonia pressure (temperature) it prepares to purge the NC gases through the solenoid valve (16). The blow-oﬀ is activated by the solenoid (16) and through appropriate piping/hosing, should be led into a water bath. This process is recommended to retain small amounts of ammonia (see Installation section).

19 20

6

4

3

1a

1

Fig. 1 - Purger R452A lay-out

1 Compressor R452A 11 Expansion valve, R452A

1a Compressor Cranck case heater 12 Heat exchanger Ammonia/R452A

2 Thermostat for crankcase heater control 13 Welding Flange

3 Discharge temp sensor R452A 14 Pressure transmitter R452A

3a Suction temperature sensor R452A 15 Pressure transmitter R717

4 Pressure safety switch 16 Solenoid valve AKVA and coil

5 Condenser 17 NC temperature sensor R717

6 Extraction fan 18 Restrictor, purge line

7 Pressure switch for Fan 19 MCX 15 (Pre-programmed)

8 Receiver 20 PSU, 24V

9 Filter 900 gram (31.7 oz) R452A

10 Sight glass

5

9

8

2

3a

14

10

11

12

15

16

17

18

6 | BC344024774466en-000401

User Guide | Intelligent Purging System (IPS 8) Ammonia

Time

On Oﬀ

Time

On Oﬀ

Working cycle The Danfoss IPS 8 operates in 24-hour cycles, of

which 45 minutes are dedicated to an R452A pull down. At power on, the pull down is initiated immediately. If no NC gases are detected during the 45 minute pull down, the system will close the solenoid valve at purge point 1 and open the solenoid valve at point 2. After a cycle time of 24 hours/N (Number of purge points), the compressor will pull down again condensing the ammonia. After 24 hours, all purge points have been vented one time.

To identify NC gases, the controller utilizes upper and lower thresholds for R452A evaporating temperature. If, during pull down, the temperature continues decreasing and the lower threshold is passed, the controller considers

Power on

Purger Pull down

(PDT): 45 min

Cycle (CST) *

this to be a high concentration of NC gases and opens the purge solenoid valve. The purge valve will stay open until suﬃcient condensing ammonia is present to lift the R452A evaporating temperature above the upper threshold.

The compressor will continue running and if the temperature again decreases below the lower threshold, a new purge will be performed. This process will be repeated until the R452A heat exchanger temperature stays above the lower threshold for >45 minutes following the previous closure of the purge valve.

Purger Pull down

(PDT): 45 min

Cycle (CST) *

Purger Pull down

(PDT): 45 min

Compressor

On

Oﬀ

Purge valve

Fig. 2 - Power on & Cycle at no NC gases present: CST (compressor start time) and PDT (pull down time) are conﬁgurable * Cycle (CST) = 24 hours/N (number of purge points)

Upper Threshold (VClseT)

Non condensables has been purged

- new cycle starts *

Evaporator Temp. (Tsat452)

Compressor

On

Oﬀ

Purge valve

Lower Threshold (VClseT)

Fig. 3 - Purging procedure - Low R452A evap. temperature detected during PDT: Thresholds are conﬁgurable * If low evaporator temperature is detected (passing lower threshold), the purging procedure will be repeated immediately

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User Guide | Intelligent Purging System (IPS 8) Ammonia

Air traps

Fig. 4 Liquid level. Bottom connected receiver Fig. 5 Liquid level. Top connected receiver

For systems with low pressure liquid level control, the correct condenser/ receiver installation is as shown in Fig. 4 and Fig. 5.

The discharge gas from the compressor (1) is led to the condenser (2) where it is condensed. The receiver (3) holds the liquid until there is a demand for liquid from the LP side, e.g., until the expansion valve (4) opens. If the expansion valve is closed, the liquid condensed in the condenser will need to be stored in the receiver and the level will increase. To ensure a free ﬂow to the receiver, the gas must be allowed to leave the receiver; this process is accomplished through the pressure equalizing line (a). The pressure equalizing line makes the pressure in the receiver the same as in the compressor discharge line. The pressure in the condenser outlet is lower due to the pressure loss in the condenser. Since the condenser outlet pressure is lower than in the receiver, it is therefore necessary to mount the condenser higher than the receiver and allow for a higher liquid level in the piping between the condenser and the receiver (b).

The liquid column in the line (b) compensates for the pressure diﬀerence between the condenser outlet and the receiver.

Fig. 4 shows the liquid connection at the bottom of the receiver.

If the liquid from the condenser is connected to the top of the receiver (Fig. 5), a slightly diﬀerent arrangement must be made. The liquid line (b) from the condenser to the receiver will need to have a goose neck/liquid trap to ensure that the liquid column is actually established.

As air is heavier than ammonia gas, the air will collect in two locations in this type of installation: On top of the liquid in the receiver (x) and/or on top of the liquid in the drop leg from the condenser (y).

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User Guide | Intelligent Purging System (IPS 8) Ammonia

Connection locations

Air purger installation in a low-pressure liquid level controlled installation

The correct locations for the air purger to be connected to the ammonia plant are: (See Fig. 6 and Fig. 7)

the condenser will be short-circuited. The air purger must have its own liquid return drop leg (c) connected in parallel with the condenser’s drop legs (b).

- on top of the receiver or

- on top of the liquid in the drop leg from the condenser.

When the purger is connected to the receiver i.e. solenoid (px) open, the liquid level in the air

purgers drop leg (c) will be equal to the receiver The air purger (5) is connected to the two purge points through solenoid valves (px and py). Note that only one solenoid should be open at any given time, otherwise the liquid column in

liquid level (3); when the purger is connected to

the condenser outlet i.e. solenoid (py) open, the

liquid level will

be equal to the liquid level in the

condenser drop leg (b).

Fig. 6 Purger connections (px) & (py). Drain piping (c) must be vertical/downward slope

Alternatively, the air purger draining of liquid can be achieved eﬀectively through an HP ﬂoat valve (6) to the low pressure side (see Fig. 7).

Fig. 7 Purger connections (px) & (py). Drain piping (c) must be vertical/downward slope

BC344024774466en-000401 | 9

User Guide | Intelligent Purging System (IPS 8) Ammonia

Connection locations

(continued)

General

Air purger installation in a high-pressure liquid level controlled installation

For systems with a high-pressure liquid level control, the air will collect in the ﬂoat valve (3). (See Fig. 8).

The compressor (1) supplies high-pressure gas to the condenser (2), where it is condensed. The ﬂoat valve (3) will ﬂash any liquid back to the LP side. The air purger (5) must be connected to the ﬂoat valve through a solenoid valve (pv).

Fig. 8 Purger connections (pv). Drain Piping (c) must be vertical/downward slope

The air purger must always be mounted above the highest liquid level to be able to drain the ammonia condensed in it. Otherwise, the air purger can ﬂood and potentially purge ammonia liquid.

The ammonia liquid condensed in the air purger must be drained through drain pipe (c) to the LP side via a ﬂoat valve (6).

The purger liquid return leg (c) must always be mounted vertically or at minimum, with a downward slope.

The solenoid valves at the connection points must never be activated at the same time. Finalize purging at one location before switching to the next.

Cod. 99000572

WARNING !

Follow the installation guide strictly during Purger installation. Install the Purger unit in a location where the bottom ﬂange level and any gas inlet connection level is above any possible ammonia liquid level.

Liquid drain piping from the purger must always have a downward slope.

Install a shut oﬀ valve close to the bottom ﬂange entrance to enable removal of the unit and closing for high pressure ammonia gas.

Connect proper resistant piping to the purging outlet pipe and ensure the purged non-condensables are discharged into a water bath of max. 200 liter.

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User Guide | Intelligent Purging System (IPS 8) Ammonia

Connection points

Multi-point purging

Single point purging setup is possible (Fig. 09) i.e. no solenoid valves with the Danfoss IPS 8 unit. This kind of installation should be installed as shown in Fig. 9 i.e. above the receiver or using a ﬂoat valve. (See section on connection locations).

For single point purging as in Fig. 09, the setting in the MCX for the number of valves to ‘0’ or switch oﬀ the multi-purging functionality in the general setup (y02).

As factory default, the Danfoss IPS 8 is conﬁgured to handle 8 purge points. The correct amount of purge points connected needs to be setup in the MCX controller after power-up. Both power and control wiring of the installed solenoid valves coils should take place prior to ﬁrst power up.

NEVER HAVE MORE THAN 1 PURGE POINT

OPEN AT A TIME.

Always close one purge valve before opening

the next.

This is done by turning the purger unit power

on (label y02) and entering the number of

actual purge points in the program. See section

“Programming/conﬁguration”.

SVA

Ammonia Liquid

Ammonia gas + NC gases

Receiver

Liquid drain to Low pressure side

Fig. 9 Single point purging from receiver Fig. 10 Multi-point purging from up to 8 purging points

SNV

SVA

NH₃ gas + NC gases

NH₃ bypass for

draining purger

Ammonia Liquid

SVA

SV3

SNV

ICF 15-4

Purge Points

- up to 8 points

Be aware of liquid traps

Where slope is shown above, ensure downward sloping pipe ﬂowing towards purger drop leg.

BC344024774466en-000401 | 11

User Guide | Intelligent Purging System (IPS 8) Ammonia

* F and ser installed between 0,05 to 1,1 m (2 to 43 in) above ser

Installation The Danfoss IPS 8 must be installed in

accordance with locations recommended in the Connection locations and Connection points sections of this document.

The unit has a protection rating of IP55 and may be installed outside, in ambient temperature ranges from from -10 °C to 43 °C / 14 °F to 109 °F). Avoid installation in direct sunlight as this may lead to excessive sunlight exposure and ambient temperatures above allowed limits. For ambient temperatures below -10 °C (14 °F) the air purger must be installed in a heated and ventilated area. The unit must be installed in a non-ATEX atmosphere as the purger unit is not explosion proof.

The purger unit should be kept in an upright position at all times - from receipt to ﬁnal installation.

Lifting Procedure

.

All 4 lifting eyes must be positioned correctly, to match the actual used lifting gear All 4 lifting eyes must be used

Fig. 11

Use all 4 lifting eyes and suitable lifting gear during installation (unit weight = 100 kg/220 lbs).

Install the unit on an even horizontal base 0.05 to 1.1 meter (2 to 43 in) above a service platform with suﬃcient support and allowing the purger subframe to be bolted to the support (see example in Fig. 12). Maintain recommended distances in all directions (Fig. 12) to allow fan cooling and servicing.

Always leave the unit oﬀ for at least 12 hours from ﬁnished installation to ﬁrst time power up.

It is important that the support construction is level to ensure the internal liquid trap is properly ﬁlled.

Angle to horizontal < 2 degrees

Min. 900 mm 1051 mm Min. 500 mm

or easy access to the main switch

* For easy access to the main switch

vicing, the Purger unit shall be

and servicing, the Purger unit shall be installed between 0,05 to 1,1 m (2 to 43 in) above service platform level.

vice platform level.

Service platform

703

32 mm

*

Flange for R717 access

Support for 100 kg/ 220 lbs

446 mm

Min. 300 mm

Min. 300 mm Min. 900 mm

12 | BC344024774466en-000401

Fig. 12 Installation dimensions

User Guide | Intelligent Purging System (IPS 8) Ammonia

Installation (continued)

Purging pipe OD 17.2 for rubber hose to water bath

Do not unscrew restrictor inside pipe. Risk of purging high NH₃ concentration

Fig. 13 Ammonia connection

Enclosed gasket

Enclosed bolts, Torque: 60 Nm (44.3 ft lb) diagonal tension

Enclosed weld ﬂange (ﬁg. 14)

Flange for NH₃ connection. Remove rubber plug

547

416,4

198 310

155

8 x 11 mm (hole)

274

Fig. 14 Enclosed weld ﬂange

1. Prepare the ammonia pipework with the weld ﬂange according to Fig. 13 and Fig. 14. The main/drain piping should never be smaller than inner diameter Ø37 mm (1.5 in).

2. Complete the supporting structure able to carry 100 kg (221 lbs).

3. Lift the purger into position using the lifting eyes on each side of the purger’s cabinet.

Remove the rubber plug from the ﬂange

opening.

4. Connect the weld ﬂange with the purger ﬂange using the enclosed ﬂat gasket and tighten the supplied 4 bolts diagonally to a torque of 60 Nm

(44.3 ft-lb).

5. Insert 4 bolts (not supplied) through the purger frame and the support construction and tighten.

6. Perform a leak test to ensure an airtight connection.

7. In the event the purger unit needs to be dismantled please contact Danfoss for instructions.

8. Correctly install a suitable pipe/hose from the purge solenoid valve for blow-oﬀ of NC gases in accordance with local or national

regulations.

9. Prepare an outside water tank with a maximum of 200 liters (53 gal.) and ensure the piping

allows the purged gas to be immersed in the water.

10. Regularly check the pH level of the tank’s

contents.

11. The pH level should never exceed 12.6.

Otherwise the water content must be renewed.

12. Dispose of concentrated waste water in

accordance

with to local/national regulations.

Note: Prior to replacing the water in the water tank ensure that the purger is switched oﬀ and the shut oﬀ valve at the ﬂanged purger inlet is closed. Leave the unit in this condition for a period to allow the remaining gas in the piping to be dissolved/released.

Watch out for bubbles.

Establish a procedure for regular checking the pH level and bubble If continuous bubbles are observed water tank during ‘‘stand by” (Green light indicator) in normal operation, one or more of the purge solenoid valves needs repair or replacement.

pattern.

in the

BC344024774466en-000401 | 13

User Guide | Intelligent Purging System (IPS 8) Ammonia

Electrical wiring

The internal wiring of the purger is done at the factory. Only the electrical wiring for the main power supply, the purge point solenoids and optional bus communication needs wiring on site.

It is highly recommended that all external cables coming from the IPS 8 to the power supply and to all purge point solenoids are protected by metallic pipes.

WARNING

Electrical hazards.

Authorized personnel only.

STANDBY

RUN ERROR

PURGING

Fig. 15 Controller box external

Controller box cover can only be opened at key unlock and with the main switch oﬀ. Note: Authorized personel only

ON/OFF Switch

Key Lock

Compressor/condenser fan On/Oﬀ

Purge valve

ANALOG OUTPUT 5-6

AO5

DIGITAL INPUT 2

COM

DI 2

DI 2H

AO6

COM

DIGITAL INPUT 1DIGITAL OUTPUT 14

DIGITAL INPUT 3

COM

DI 3H

Compressor relay24V Converter

Main Power 230V 60 Hz

L N Earth

Main Switch

Solenoid valves On/Oﬀ

MCX15B Controller On/Oﬀ

AI3

AI1

AI2

DI 1

D1 H

COM

NO 15

NO 14

NC 14

NC 15

DIGITAL OUTPUT 15

DIGITAL INPUT 4

DI 3

DI 4

COM

DI 4H

DIGITAL INPUT 9-12

DIGITAL INPUT 5-8

DI 5

DI 9

DI 7

DI 6

DI 8

COM

DI 10

COM

5V+

ANALOG INPIT 1-6

DIGITAL INPUT 13-16

COM

DI 11

DI 12

COM

DI 13

DI 15

DI 14

DI 16

AI7

AI8

AI9

AI10

AI6

AI4

AI5

COM

5V+

COM

5V+

12V+

ANALOG INPUT 7-10

MCX

CAN RJ

DIGITAL INPUT 17-18

COM

DI 17

DI 18

CAN

L

N

POWER

MCX15B Controller

14 | BC344024774466en-000401

Fig. 16 Controller box internal

Optional 24V DC power supply for (8) purge solenoids (not included)

Output terminals for: Up to 8 purge points ICFD drain valve

User Guide | Intelligent Purging System (IPS 8) Ammonia

Electrical wiring

(continued)

230V AC

QS1

L

N

QM1 QM2

L/1

N/1

L/4

QM3

L/5

KL1 KL1

L/3

Crankcase heater

GD1 GD2

24V DC

0V DC

Power supply MCX15B

9

8

Power supply Solenoid valves*

L/2

Press. Switch

M1 M2 VR1 1 1 1

Compressor

Condenser Fan

Extraction air fan

TR

RC

*When using GD2 24V DC, remove 1-2 and 3-4 bridges between the terminals and connect power supply

Fig. 17 Power Supply

MCX15B OUTPUT

C 1

NO 1

N1

L 1

NO 2

C 3

C 2

NO 3

NO 4

5

C 4

C

C 6

NO 5

NO 6

C 7

NO 7

NO 8

C 9

C 8

NO 9

C 10

NO 10

NC 10

11

NO

C 12

NC 12

NO 12

C 13

NO 13

NC 13

C 14

NC 14

NO 14

C 15

NC 15

NO 15

C 11

NC 11

24V DC

12

345

Solenoid valve

0V DC

Fig. 18 Controller MCX15B Inputs and Outputs

8

6

7

10

11

12

13

Solenoid valve

System running

System error

14

15

Solenoid valve

16

Solenoid valve

17

Solenoid valve

18

Solenoid valve

9

BC344024774466en-000401 | 15

User Guide | Intelligent Purging System (IPS 8) Ammonia

Electrical wiring

(continued)

24V DC 24V DC

0V DC 0V DC

6

AO

AO 5

COM

DI COM

DI 2DI 2HDI 3DI 3H

DI COM

Fig. 19 Controller MCX15B Inputs

Light Indicators

DI COM

KL1

Compressor relay

26

DI 1

DI 4

DI 4H

Discharge Temp. sensor

Suction Temp. sensor

Temp. sensor

Low pressure transmitter

High pressure transmitter

R717

XT1

ST1

212223

19

20

AI 1AI 2

L1

N 1

DI 1H

AO 1

AO 4

AO 2

AO 3

COM

AI 3

5V+

12V+

5V+

ST2

ST3

COM

BPL

AI 7

24

25

4

AI

AI 5

AI 6

COM

BPH

AI 8

AI 9

AI 10

5V+

MCX15B INPUT

DI COM

DI 5DI

6

DI 7

DI 9

COM

DI 8

DI 12

DI 10

COM

DI 11

DI 13

DI 14

DI 15

DI 16

COM

DI 17

DI 18

COM

GND

D +

GND

D -

ON/OFF Switch

R120

CAN GND

CAN H

CAN L

CAN HIDCAN L

CAN GND

STANDBY RUN ERROR

Green

Yellow

light

PURGING

Red

light

Key Lock

Fig. 20

Lights ON Status

Compressor ONCompressor

OFF

Purge Valve ONPurge Valve

OFF

Green Stand by x x

Yellow Run x x

Green & Yellow Purging x x

Green & Yellow & Red

Red

* The purger continuous purging until max running period (default 160 h) is reached and the purger compressor will stop ** The purger compressor stops when alarm occurs

Uninterupted Long time purging (> 150 h)

Occurs when: Check list of alarms description

x x*

(x**) x** x

Alarm

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User Guide | Intelligent Purging System (IPS 8) Ammonia

Upper Threshold for Purge Valv

Log of purging events

Quick Startup

Navigation - built in MCX controller

(Placed at the rear of the front panel door)

R717 low Pres limit

Actual R717 Pres

Actual R452A Pres

Lower Threshold for Purge Valve

Actual R452A Temp

e

For the fastest possible system conﬁguration after connecting all purge points to the IPS and following ﬁrst power up of the IPS, follow these simple instructions:

1. Navigate from the Main Menu to Login

2. Enter password '200'.

3. Choose 'Parameters'.

4. Choose 'Unit Conﬁg'

5. Choose 'Valve Settings'

6. Enter the amount of purge solenoid valves connected to the IPS.

After switching on the controller, a display window will momentarily show the actual software version, followed by the default main

While in operation mode, the Up/Down arrow buttons lead the user to the status windows described in Table 01 below.

operating window shown in Fig. 26.

Up

Down Enter

Compressor on Error/Alarm Purge valve open Purge point (1-8)

Esc

.

Not Used

Main screen, current informaon on IPS status

Status of purging process and purging counters

Temperature and superheat status

Informaon on Purge points acvity

Fig. 21 - Default main window. Operating (start) mode. (Examples only)

Table 01 - Status windows

Purge Point percentage Distribution of the actual purging on the various purge points

Dis. temp. Actual R452A discharge temperature (°C)

Main Window default See above

Cycle info Acc. time Purge valve open (h)

Past events Last 7 purging events (min)

BC344024774466en-000401 | 17

User Guide | Intelligent Purging System (IPS 8) Ammonia

Conﬁguring using the LCD

By pressing the main menu will show up with the options below

Table 02 Main menu navigation

Main Menu Submenu Submenu/status Submenu/status Min Max Default Description Label

Active alarms

Alarms

Login Password *** 200 N/A

Start

Parameters

Input/Output Input / Output Display & Conﬁg

Reset alarms Reset all actual alarms

Log history View log history

Clear log history

Turn On Main swith ON

Turn Oﬀ Main swith OFF

Unit conﬁg

No alarm

up to 15 alarms (see table below)

Compressor

Limits settings

Up to 15 possible alarms listed by arrow up/down

Clear log history

0 sec 100 sec 20 sec SDT (Compressor start delay) CM2

5 min

180 min

24 hours

0 bar 5 bar 0.5 bar Comp Diﬀ (Hysteresis min allowed ammonia pressure) CM5

0 bar 12 bar 6.5 bar Setpoint to start compressor CM1

2000

45 min PDT (Pull down time) CM3

min

2000

hours

min

768

1440

CST (Cycle time) CM4

min

160

PLT (Endless purging max time) VA5

hours

18 | BC344024774466en-000401

User Guide | Intelligent Purging System (IPS 8) Ammonia

Table 03 Occurring active alarms, possible reasons and recommended action

Label Parameter Name Description Possible Reason Recommended action

ALARMS

A01 General alarm Input from AI3 Leads to shut down of IPS 8 Fault in system connected to the DIO4 Input from AI3 Leads to shut down of IPS 9

E01 Temp Sensor Fault

E02 BPL Sensor Fault

E03 BPL Sensor Fault

E04 Low temperature

E05 High temperature

E05 High temperature Low R452a charge because of possible leak Locate and repair leak Evacuate Move the IPS to a lower ambient temperature

E06 Low pressure BPL Indicates too low R452a pressure Choked restrictor / wrong connection

E07 High pressure BPL Indicates too high R452a pressure R452s system pressure too high

E08 Low pressure BPH Indicates too low R717 pressure Closed stop valve

E09 High pressure BPH Indicates too high R717 pressure R717 system pressure too high Pressure is 24 bar

E10 System is OFF Indicates status of the main switch Main switch is OFF Switch ON the main switch

E11 Memory is full A memor y reset is required Memory is full from long time operation

E12 Totla purge time error

E13 Compressor ERROR

E14 Liquid alarm

E15 Memory wrong!

E16 Discharge sensor error Indicates no signal from temperature sensor

E17 Suction sensor error Indicates no signal from temperature sensor

All alarms except (*) activates red light on box outside For alarms not resettable and/or cause not identiﬁed, please contact Danfoss Level legend: 0 = Read view, 2 = Installer view (code 200) 3 = Danfoss Service view (Contact Danfoss)

Indicates no signal from temperature sensor (R452a)

Indicates no signal from pressure transmitter (R452a)

Indicates no signal from pressure transmitter (R717)

Indicates too low ambient temperature (<-10 °C)

Indicates too high ambient temperature (>120 °C)

This occurs when PLT is activated System will automatically restart when CST has expired

Indicates no status is being received from relay KL01

Signal from the LLS that there is liquid in the evaporator

Wrong counter values The unit will automatically repair itself

Broken wire to R452a temperature sensor

Electrical supply failure supplying R452a temperature sensor

Temperature measurement of the R452a line is out of range

Broken wire to R452A pressure transmitter

Electrical supply failure to the R422a pressure transmitter

Pressure measurement of the R452a line is out of range

Broken wire to R717 pressure transmitter

Electrical supply failure to the R717 pressure transmitter

Pressure measurement of the R717 line is out of range

Too low ambient temperature Move the IPS to a higher ambient temperature

Too high ambient temperature Move the IPS to a lower ambient temperature

Restrictor is blocked Replace the restrictor

Possible broken wire from the MCX Repair broken wire from the MCX

Repair temperature sensor wire or replace temperature sensor

Repair or replace power source

Compare temperature with another temperature sensor reading and replace temperature sensor if needed

Repair pressure transmitter wire or replace pressure transmitter

Repair or replace power source

Compare pressure with another pressure reading and replace pressure transmitter if needed

Repair pressure transmitter wire or replace pressure transmitter

Repair or replace power source

Compare pressure with another pressure reading and replace pressure transmitter if needed

Factory setting 0.3 bar, we can have several problems: a) Restrictor is blocked (clean it). b) Wrong piping and as addition ammonia is draining, so check piping’s. c) Check SV ﬂoat

a) Expansion valve is not working b) To high ambient temperature (24 bar /54 ºC)

Purge points are blocked, or ﬂange is blocked with rubber plug

Clean MCX memory by means of ﬁnding Parameters_UnitConﬁg_

BC344024774466en-000401 | 19

User Guide | Intelligent Purging System (IPS 8) Ammonia

Modbus RTU Good Practice

The wiring of Modbus RTU (RS485) must be carried out in accordance with the standard ANSI/TIA/EIA-485-A-1998.

Galvanic separation shall be provided for segments crossing buildings. Common ground shall be used for all devices on the same network inclusive router, gateways etc.

All bus connections in the cables are made with twisted pair wires. The recommended cable type for this is AWG 22/0.32 mm². If used for longer distances please use a AWG 20/0.5mm² or AWG 18/0.75mm² cable. The cables characteristic impedance shall be between 100 – 130Ω The capacitance between conductors shall be less than 100 pf per meter. Note: the length of the cables inﬂuence the communication speed used. Longer cable lengths mean lower baud rate should be used. Maximum cable length allowed is 1200m. Use a minimum 20 cm distance between 110V/230V/400V power line cables and bus cables.

Table 04 Modbus RTU Registers

Register Parameter Name Description

GENERAL > SETUP

3001 ON/OFF

3002 Activate Multipurger

3003

3007

3008

3009

3010 Password level 1

3011 Password level 2

3014 PDT

3015 CST

3016 PLT

Restore default parameters

GENERAL > SERIAL SETTINGS

Serial address (Modbus and CAN)

Serial baudrate (Modbus)

Serial settings (Modbus)

GENERAL > PASSWORD

UNIT CONFIG > COMPRESSOR

0: Main switch oﬀ 1: Main switch on

Switch on/oﬀ multipurging functionality 0: No 1: Yes, switch on multipurging functionality

0: No 1: Yes, restore default parameters

2 1 100 1 N/A RW 3/6 Short Yes

TThe rate at which information is transferred in the RS485 communication channel

0: 0 1: 12 2: 24 3: 48 4: 96 5: 144 6: 192 7: 288 8: 384

0: 8N1 1: 8E1 2: 8N2

password for user level 1

password for user level 2

Pull down time of compressor

Delay between purge cycles (single purge)

Alarm for endless purging

User Level

Min Value Max Value

2 0 1 1 Enum 1 RW 3/6 Short Yes

2 0 1 1 Enum 2 RW 3/6 Short Yes

2 0 1 0 Enum 2 RW 3/6 Short Yes

2 0 8 6 Enum 3 RW 3/6 Short Yes

2 0 2 1 Enum 4 RW 3/6 Short Yes

3 0 999 100 N/A RW 3/6 Short Yes

3 0 999 200 N/A RW 3/6 Short Yes

2 5 CM4 45 min RW 3/6 Short Yes

2 180 2000 1440 min RW 3/6 Short Yes

2 24 768 24 h RW 3/6 Short Yes

Default

Value

Unit/ Type

Read/

Write

Modbus

Function

Code

Modbus

Data Type

Persistent

Yes/No

20 | BC344024774466en-000401

User Guide | Intelligent Purging System (IPS 8) Ammonia

Register Parameter Name Description

3022 Max_PP

3034 Setpoint

3035 Tsh Setpoint for superheat 2 5,0 40,0 15 °C R/W 3/6 Short Yes

1859 Reset Alarms Reset alarm 0 0 2 0 N/A R/W 3/6 Short Yes

8101 SystemOnOﬀ

8102 ValveStatus

8103 CompressorStatus

8104 ALARActive

8105 PressTotemp

8106 ValveCount

8108 ComprTime

8110 COmprStartAfter

9901

8112 ValveHour

8114 StatusKL

8115 WaringCompr

8116 ValveSetpoint

8117 ValveClose

8119 Event1

8121 Event2

UNIT CONFIG > VALVE SETTINGS

UNIT CONFIG > LIMITS SETTINGS

STATUS VAR > MCX DESIGN HOTSPOTS

Advanced Setting ResetMem

Used amount of purge points - part of initial setup

Pressure threshhold for compressor

Feedback from the main switch

Feedback from the purge valve - open/ closed

Feedback from the compressor - on/oﬀ

Any alarm active indicator

Suction temperature (calculated from pressure on suction)

The amount of purge valve activations

Remaining time for compressor pull-down for the actual purge pointr cycle

The delay between the purging cycles

Recommend default setting only - All logged values are reset 0: NO 1: YES

The amount of hours that the main purge valve has been active

Status of KL01 relay (compressor and crankcase heater)

Indicates problem with compressor status

Temperature threshhold for the opening of the main purge valve

Temperature threshhold for the closing of the main purge valve

Purge cycle event counts the minutes that the purge valve has been open on a ﬁnished cycle

Purge cycle event counts the accumative minutes that the purge valve has been open on a ﬁnished cycle

User

Level

Min Value Max Value

2 0 8 8 N/A RW 3/6 Short Yes

2 0,0 12,0 6.5 bar R/W 3/6 Short Yes

0 -32768 32767 0 Enum 1

0 -32768 32767 0 Enum 1 R/W 3/6 Short Ye s

0 -32768 32767 0 Enum 2

0 -327,7 327,7 0 °C

0 -2147483648 2147483647 0 N/A

0 -2147483648 2147483647 0 Minutes

0 0 1 0 Enum 2 R/W 3/6 Short Ye s

0 -214748364,8 214748364,7 0 Hours

0 -32768 32767 0 Enum 2

0 -2147483648 2147483647 0 °C

0 -3276,8 3276,7 0 Minutes

Default

Value

Unit/

Type

Read/ Write

Read

only

Read

only

Read

only

Read

only

Read

only

Read

only

Read

only

Read

only

Read

only

Read

only

Read

only

Read

only

Read

only

Read

only

Modbus

Function

Code

Modbus

Data Type

3 Short No

3 Long No

3 Short No

3 Long No

Persistent

Yes/No

BC344024774466en-000401 | 21

User Guide | Intelligent Purging System (IPS 8) Ammonia

Register Parameter Name Description

Purge cycle event counts the accumative

8123 Event3

8125 Event4

8127 Event5

8129 Event6

8131 Event7

8133 PP1

8135 PP2

8137 PP3

8139 PP4

8141 PP5

8143 PP6

8145 PP7

8147 PP8

8149 Val1

8150 Val2

8151 Val3

8152 Val4

8153 Val5

8154 Val6

8155 Val7

8156 Val8

8158 TempStatus

8159 BPLStatus The pressure on R452 0 -32768 32767 0 bar

8160 BPHStatus The pressure on R717 0 -2147483648 2147483647 0 bar

minutes that the purge valve has been open on a ﬁnished cycle

Purge cycle event counts the accumative minutes that the purge valve has been open on a ﬁnished cycle

The time percentage for this purge point

This indicates if the purge point is active

The measured temperature on the discharge line of compressor

User

Level

Min Value Max Value

0 -3276,8 3276,7 0 Minutes

0 -32768 32767 0 %

0 -32768 32767 0 N/A

0 -32768 32767 0 °C

Default

Value

Unit/ Type

Read/ Write

Read

only

Read

only

Read

only

Read

only

Read

only

Read

only

Read

only

Read

only

Read

only

Read

only

Read

only

Read

only

Read

only

Read

only

Read

only

Read

only

Read

only

Read

only

Read

only

Read

only

Read

only

Read

only

Read

only

Read

only

Modbus

Function

Code

Modbus

Data Type

3 Long No

3 Short No

Persistent

Yes/No

22 | BC344024774466en-000401

User Guide | Intelligent Purging System (IPS 8) Ammonia

Register Parameter Name Description

8161 DisTemp

8162 SuctionTemp

8163 TshValveStatus

8164 TshCalculate

ALARMS

1901 .08 General alarm

1901 .09 Temp Sensor Fault

1901 .10 BPL Sensor Fault

1901 .11 BPH Sensor Fault

1901 .12 Low temperature

1901 .13 Hi temperature

1901 .14 Low pressure BPL

1901 .15 Hi pressure BPL

1901 .00 Low pressure BPH

1901 .01 Hi pressure BPH

1901 .02 System is OFF

1901 .03 Memory is full

1901 .04 Totla purge time error

1901 .05 Compressor EROR

1901 .06 Liquid alarm

1901 .07 Memory wrong!

1902 .08 Discharge sensor error

1902 .09 Suction sensor error

The measured temperature on the purge valve

The measured temperature on the suction line

The measured value of the superheat

The calculated value of the superheat from the refrigerant type

Input from AI3. Leads to shut down of IPS 8

Indicates no signal from temperature R452A sensor

Indicates no signal from pressure sensor (R452a)

Indicates no signal from pressure sensor (R717)

Indicates too low ambient temperature (<-10 °C)

Indicates too high ambient temperature (>120 °C)

Indicates too low R452a pressure

Indicates too high R452a pressure

Indicates too low R717 pressure

Indicates too high R717 pressure

Indicates status o the main switch

A memory reset is required

This occurs when PLT is activated. System will automatically restart when CST has expired

Indicates no status is being received from KL01

Signal from the LLS that there is liquid in the evaporator

Wrong counter values. The unit will automatically repair itself

Indicates no signal from temperature sensor

User

Level

Min Value Max Value

0 -32768 32767 0 °C

0 -2147483648 2147483647 0 °C

0 -32768 32767 0 °C

0 -2147483648 2147483647 0 K

0 0 1 0 AUTO R.

Default

Value

Unit/

Type

Read/ Write

Read

only

Read

only

Read

only

Read

only

Read

only

Read

only

Read

only

Read

only

Read

only

Read

only

Read

only

Read

only

Read

only

Read

only

Read

only

Read

only

Read

only

Read

only

Read

only

Read

only

Read

only

Read

only

Modbus

Function

Code

Modbus

Data Type

3 Short No

3 Long No

Persistent

Yes/No

BC344024774466en-000401 | 23

User Guide | Intelligent Purging System (IPS 8) Ammonia

Register Parameter Name Description

I/O CONFIGURATION

ANALOG INPUTS

1005 BPL-1/34

1006 BPH-1/59

1007 Dis. Temp

1008 TempSuction

1009 NC Temp

DIGITAL INPUTS

1001.08 Status KL1

1001.09 On/Oﬀ

1001.10 General Alarm General Alarm input 2 0 1 0 N.O.

1001.11 LiquidAlarm Liquid Alarm input 2 0 1 0 N.O.

DIGITAL OUTPUTS 0 = OFF ; 1 = ON

1003.08 Compressor Compressor relay 2 0 1 N/A N.O.

1003.09 Valve Main purge valve relay 2 0 1 N/A N.O.

1003.10 Green Status LED 2 0 1 N/A N.O.

1003.11 Yellow Status LED 2 0 1 N/A N.O.

1003.12 DO_Red Status LED 2 0 1 N/A N.O.

1003.13 ICFD_Valve

1003.14 Valve1 Purge point valve relay 2 0 1 N/A N.O.

1003.15 Valve2 Purge point valve relay 2 0 1 N/A N.O.

1003.00 Valve3 Purge point valve relay 2 0 1 N/A N.O.

1003.01 Valve4 Purge point valve relay 2 0 1 N/A N.O.

1003.02 Valve5 Purge point valve relay 2 0 1 N/A N.O.

1003.03 Valve6 Purge point valve relay 2 0 1 N/A N.O.

1003.04 Valve7 Purge point valve relay 2 0 1 N/A N.O.

1003.05 Valve8 Purge point valve relay 2 0 1 N/A N.O.

1003.06 Alarm Alarm relay N/A 0 1 N/A N.C.

Pressure at the R452a suction line

Condensing pressure of R717

Measured discarge temperature of compressor

Measured suction temperature

Measured non Condensable gas temperature

Compressor status (KL01) 0: Compressor oﬀ 1: Compressor on

Main switch input 0: Main switch oﬀ 1: Main switch on

ICFD relay (solenoid valve)

User Level

Min Value Max Value

2 -1.0 34.0 N/A 0-5 V

2 -1.0 59.0 N/A 0-5 V

2 -50.0 170.0 N/A PT1000

2 0 1 1 N.O.

2 0 1 N/A N.O.

Default

Value

Unit/ Type

Read/

Write

Read

only

Read

only

Read

only

Read

only

Read

only

Read

only

Read

only

Read

only

Read

only

Read

only

Read

only

Read

only

Read

only

Read

only

Read

only

Read

only

Read

only

Read

only

Read

only

Read

only

Read

only

Read

only

Read

only

Read

only

Modbus

Function

Code

N/A N/A N/A

Modbus

Data Type

3 Short No

3 Long No

Persistent

Yes/No

24 | BC344024774466en-000401

User Guide | Intelligent Purging System (IPS 8) Ammonia

Maintenance/Service/ Disposal

Table 05 Maintenance checklist - Perform once a year minimum

1 Use P&I dagram and check that all powered components are working properly

2 Check for alarms in the MCX controller

3 Fans, air ﬁlters and ﬁns must be cleaned for dirt and dust

4 Expansion valve must be inspected and must be replaced if damaged

5 Ensure expansion valves sensor bulb has good contact with suction line

6 Replace water in water bubble bath. Check pH level frequently and replace when pH > 12.6

7 Check cover is mounted correctly and all bolts are tightened accordingly

8 Check and verify the amperage of the unit

9 Check for abnormal compressor noises in normal operating conditions (may indicate loose bolts, worn bearings or pistons)

Table 06 Procedure to isolate IPS for servicing

Multipoint Single point purging from receiver

Close all supply lines from the purge points of the ammonia

1

system. Do not close any stop valve between IPS 8 and ﬂoat valve

2 Restart the controller to force pump-down Wait 20 minutes

3 Wait 20 minutes

Stop the compressor by turning the compressor switch QM1 to

4

the oﬀ position

Close the SVA shut-oﬀ valve in the drain line (located under

5

the IPS 8)

Release the remaining system pressure to atmosphere by opening the SNV drain valve. This can also be done by

6

attaching a permanent magnet on the AKVA 10 valve for forced opening

Restart the controller to force pump-down

Stop the compressor by turning the compressor switch QM1 to the oﬀ position

Close the SVA shut-oﬀ valve in the drain line (located under the IPS 8)

Release the remaining system pressure to atmosphere by opening the SNV drain valve. This can also be done by attaching a permanent magnet on the AKVA 10 valve for forced opening

Disposal of the IPS 8

If an IPS 8 unit is worn out and has to be replaced, the disposal must be done in accordance with national legislation and only done by competent personnel.

BC344024774466en-000401 | 25

26 | BC344024774466en-000401

Danfoss IPS 8 User guide

Specifications and Main Features

Frequently Asked Questions

User Manual