Danfoss IPS 8 Instruction manual

ir.danfoss.com148R9645
User Guide
Intelligent Purging System (IPS 8) for Ammonia
Technical data, installation and use
ir.danfoss.com148R9645

User Guide |Intelligent Purging System (IPS 8) for Ammonia - Technical data, installation and use
2 | BC306932151284en-000201 © Danfoss | DCS (ms) | 2020.01
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
Contents

User Guide |Intelligent Purging System (IPS 8) for Ammonia - Technical data, installation and use
© Danfoss | DCS (ms) | 2020.01 BC306932151284en-000201 | 3
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.
Date: YYYY.MM.DD
Place of issue:
Issued by Date: YYYY.MM.DD
Place of issue:
Approved by
Signature:
Name: Su Cheong Ho
Title: Lead Design Engineer
Signature:
Name: Behzad Parastar
Title: Product Manager
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
Revision No:AA Page 1 of
Danfoss A/S
6430 Nordborg
Denmark
CVR nr.: 20 16 57 15
Telephone: [phone]
Fax: [phone]
EU DECLARATION OF CONFORMITY
Danfoss A/S
Refrigeration & Air Conditioning Controls
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.
1

User Guide |Intelligent Purging System (IPS 8) for Ammonia - Technical data, installation and use
4 | BC306932151284en-000201 © Danfoss | DCS (ms) | 2020.01
Ordering Unit Code number
Danfoss Intelligent Purging System IPS 8 unit 084H5001
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 084H5055
Purger solenoid kit (Armature, tube, Sealing, Orifice, Filter insert) x 084H5051
Solenoid coil, 220 – 230V, 50 HZ for AKV x 018F6801
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 (2 pieces) 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 123F2126
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
Technical data Supply voltage 230V AC, 1ph, 50Hz
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)
Note:
All Spare part items are parts already built into
the IPS 8. All accessories are not.

User Guide |Intelligent Purging System (IPS 8) for Ammonia - Technical data, installation and use
© Danfoss | DCS (ms) | 2020.01 BC306932151284en-000201 | 5
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.
Introduction
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

User Guide |Intelligent Purging System (IPS 8) for Ammonia - Technical data, installation and use
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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.
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).
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
Fig. 1 - Purger R452A lay-out
1
1a
2
3
4
5
7
8
9
10
11
15
16
17
18
13
12
14
6
19 20
3a

User Guide |Intelligent Purging System (IPS 8) for Ammonia - Technical data, installation and use
© Danfoss | DCS (ms) | 2020.01 BC306932151284en-000201 | 7
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
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.
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)
Cycle (CST) *
Purger Pull down (PDT): 45 min
Cycle (CST) *
Purger Pull down (PDT): 45 min
Time
Power on Purger Pull down (PDT): 45 min
On
Off
On
Off
Compressor
Purge valve
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
Time
On
Off
On
Off
Compressor
Purge valve
Evaporator Temp. (Tsat452)
Upper Threshold (VClseT)
Lower Threshold (VClseT)
Non condensables has been purged
- new cycle starts *

User Guide |Intelligent Purging System (IPS 8) for Ammonia - Technical data, installation and use
8 | BC306932151284en-000201 © Danfoss | DCS (ms) | 2020.01
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).

User Guide |Intelligent Purging System (IPS 8) for Ammonia - Technical data, installation and use
© Danfoss | DCS (ms) | 2020.01 BC306932151284en-000201 | 9
Connection locations
The correct locations for the air purger to be
connected to the ammonia plant are:
(See Fig. 6 and Fig. 7)
- on top of the receiver or
- on top of the liquid in the drop leg from the
condenser.
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
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).
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
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
Air purger installation in a low-pressure liquid level controlled installation
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

User Guide |Intelligent Purging System (IPS 8) for Ammonia - Technical data, installation and use
10 | BC306932151284en-000201 © Danfoss | DCS (ms) | 2020.01
Connection locations
(continued) 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).
The ammonia liquid condensed in the air purger
must be drained through drain pipe (c) to the LP
side via a float valve (6).
Air purger installation in a high-pressure liquid level controlled installation
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 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.
General
Fig. 8 Purger connections (pv). Drain Piping (c) must be vertical/downward slope
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.
Cod. 99000572
WARNING !

User Guide |Intelligent Purging System (IPS 8) for Ammonia - Technical data, installation and use
© Danfoss | DCS (ms) | 2020.01 BC306932151284en-000201 | 11
Connection points
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.
Multi-point purging
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”.
Fig. 9 Single point purging from receiver Fig. 10 Multi-point purging from up to 8 purging points
Purge Points
- up to 8 points
ICF 15-4
Be aware of liquid traps
Where slope is
shown above, ensure
downward sloping
pipe flowing towards
purger drop leg.
NH₃ gas + NC gases
SVA
SNV
Liquid drain to Low
pressure side
Receiver
Ammonia Liquid
Ammonia Liquid
Ammonia gas + NC gases
NH₃ bypass for draining purger
SVA
SNV
SNV
SV3
SVA

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12 | BC306932151284en-000201 © Danfoss | DCS (ms) | 2020.01
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.
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
Fig. 11
Fig. 12 Installation dimensions
*
Flange for R717 access
Support for 100 kg/ 220 lbs
Service platform
*
Flange for R717 access
Support for 100 kg/ 220 lbs
Service platform
Use all 4 lifting eyes and appropriate
lifting gear for lifting the purger unit
* For easy access to the main switch
and servicing, the Purger unit shall be
installed between 0,05 to 1,1 m (2 to 43 in)
above service platform level.
Min. 900 mm 1051 mm Min. 500 mm
32 mm
446 mm
Min. 300 mm Min. 900 mm
Min. 300 mm
703

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Installation (continued)
Fig. 13 Ammonia connection
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.
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 pattern.
If continuous bubbles are observed in the
water tank during‘‘stand by”(Green light
indicator) in normal operation, one or
more of the purge solenoid valves needs
repair or replacement.
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.
120°
Ø43
Ø37
82
57
57
4 x Ø14
82
Ø22
57
57
Enclosed gasket
Flange for NH₃ connection. Remove rubber plug
Enclosed bolts, Torque: 60 Nm
(44.3 ft lb) diagonal tension
Purging pipe OD 17.2 for rubber hose to water bath
Do not unscrew restrictor inside pipe.
Risk of purging high NH₃ concentration
Enclosed weld flange (fig. 14)
547
8 x 11 mm (hole) 274
416,4
198
310
155

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14 | BC306932151284en-000201 © Danfoss | DCS (ms) | 2020.01
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.
Controller box cover can only be opened at key unlock and with the main switch off.
Note: Authorized personel only
Fig. 15 Controller box external
Fig. 16 Controller box internal
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.
Electrical
hazards.
Authorized
personnel only.
WARNING
ON/OFF Switch
STANDBY RUN ERROR
PURGING
Key Lock
COM
AI1 AI2
ANALOG INPIT 1-6
COM
AI7 AI8 AI9 AI10
5V+
ANALOG INPUT 7-10
DI 2H
DI 2
COM
DIGITAL INPUT 2
CAN
CAN RJ
MCX
DI 3H
DI 3
COM
DIGITAL INPUT 3
DI 4H
DI 4
COM
DIGITAL INPUT 4
AO5
COM
ANALOG OUTPUT 5-6DIGITAL OUTPUT 15
AI3
5V+
12V+
5V+
AI4 AI5
L N
POWER
DI 17 DI 18
COM
COM
DIGITAL INPUT 17-18
DI 13
DI 14 DI 16
COM
DIGITAL INPUT 13-16
DI 15
DI 9
DI 10 DI 12
COM
DIGITAL INPUT 9-12
DI 11
DI 5
DI 6 DI 8
COM
DIGITAL INPUT 5-8
DI 7
AO6
COM
DI 1
D1 H
DIGITAL INPUT 1DIGITAL OUTPUT 14
NO 14
COM
NC 14
NO 15
COM
NC 15
AI6
COM
MCX15B Controller
Up to 8 purge valves
Optional 24V DC
power supply for (8)
purge solenoids
(not included)
MCX15B Controller
On/Off
Main Switch
Main Power
230V 50 Hz
L
Compressor relay24V Converter
Compressor/condenser
fan On/Off
Purge valve
Earth
N
Solenoid valves
On/Off

User Guide |Intelligent Purging System (IPS 8) for Ammonia - Technical data, installation and use
© Danfoss | DCS (ms) | 2020.01 BC306932151284en-000201 | 15
Electrical wiring
(continued)
Fig. 17 Power Supply
*When using GD2 24V DC, remove 1-2 and 3-4 bridges between the terminals and connect power supply
Fig. 18 Controller MCX15B Inputs and Outputs
L/1
N/1
L
N
L/3
L/4 L/5
9 8
L/2
Compressor
M1 M2 VR1
1 1 1
Press.
Switch
Extraction
air fan Crankcase heater
24V DC 0V DC
Power supply
MCX15B Power supply Solenoid valves*
Condenser
Fan
230V AC
QS1
QM1 QM2
GD1 GD2
QM3
KL1 KL1
TR
RC
NO1
C 1
NO2
C 2
NO3
C 3
NO4
C 4
NO5
C 5
N1 L1 NO6
C 6
NO7
C 7
NO8
C 8
NO9
C 9
NC15
C 15
NO15 NC14
C 14
NO14
NC13
C 13
NO13
NC12
C 12
NO12
NC11
C 11
NO
11
NC10
C 10
NO10
9
8
12 3
4
5 6 7
10 11 12 13 14 17 18 15 16
Solenoid valve System running System running System error
Solenoid valve Solenoid valve Solenoid valve Solenoid valve Solenoid valve Solenoid valve Solenoid valve Solenoid valve Solenoid valve
24V DC
0V DC
MCX15B OUTPUT

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Fig. 20
Lights ON Status Compressor
ON
Compressor
OFF
Purge Valve
ON
Purge Valve
OFF Alarm
Green Stand by x x
Yellow Run x x
Green & Yellow Purging x x
Green & Yellow
& Red
Uninterupted Long time
purging (> 150 h) x x*
Red Occurs when: Check list
of alarms description (x**) x** x
* 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
Electrical wiring
(continued)
Fig. 19 Controller MCX15B Inputs
Light Indicators
21 22 23 19 20
5V+
DI COM
DI1
COM
DI1H
DI
5
DI
6
DI7 DI8
12V+
AI
4
AI
1
AI2
AO1 AO2 AO3
D + GND D - CAN H R120 CAN L
CAN GND
CAN H
ID
CAN L
CAN GND
DI9
DI10 DI11
DI12
DI13 DI14 DI15 DI16
COM DI17 DI18 DI
2
DI
2H
DI
3
DI3H
DI COM
DI4 DI4H
DI COM
D + GND D -
AO4
L1 N 1
AI5 AI6
COM
AO5
COM
AO
6
COM
COM
AI7 AI8 AI9 AI10
5V+
AI3
COM
DI COM
COM
COM
5V+
24 25
26
Compressor
relay
24V DC 24V DC
0V DC 0V DC
XT1
Discharge
Temp. sensor
MCX15B INPUT
Suction
Temp. sensor
R717
Temp.
sensor
Low
pressure
transmitter
High
pressure
transmitter
STANDBY RUN ERROR
PURGING
Green
light
Yellow
light
Red
light
ON/OFF Switch
Key Lock
KL1
BPL
ST1 ST2 ST3
BPH

User Guide |Intelligent Purging System (IPS 8) for Ammonia - Technical data, installation and use
© Danfoss | DCS (ms) | 2020.01 BC306932151284en-000201 | 17
General display
Quick Startup
After switching on the controller, a display
window will momentarily show the actual
software version, followed by the default main
operating window shown in Fig. 21.
While in operation mode, the Up/Down arrow
buttons lead the user to the status windows
described in Table 01 below.
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)
Standby Run (Pull down)
Purging
Esc.
Up
Down Enter
R717 low Pres limit
Actual R717 Pres
Actual R452A Pres
Upper
Threshold for Purge Valve
Lo
wer Threshold for Purge Valve
Actual R452A Temp
Compressor on
Not
Used
P717On _bar
Psat717 _bar
Psat452 _bar
VClseT _°C
VOpenT _°C
Tsat452 _°C
P717On 6.5 bar
Psat717 9.0 bar
Psat452 8.7 bar
VClseT -25.0 °C
VOpenT -30.0 °C
Tsat452 11.9 °C
P717On
Psat717
Psat452
VClseT
VOpenT
Tsat452
6.5
9.0
8.0
-25.0
-30.0
16.5
bar
bar
bar
°C
°C
°C
VClseT
VOpenT
Tsat452
6.5
9.0
0.7
-25.0
-30.0
-31.8
bar
bar
bar
°C
°C
°C
Alarm present
P717On
Psat717
Psat452
VClseT
VOpenT
Tsat452
6.5 bar
9.0 bar
0.1 bar
-42.4 °C
-47.4 °C
- 31.8 °C
Psat717
Psat452
P717On
Error/AlarmPurge valve open Purge point (1-8)
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.

User Guide |Intelligent Purging System (IPS 8) for Ammonia - Technical data, installation and use
18 | BC306932151284en-000201 © Danfoss | DCS (ms) | 2020.01
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
Alarms
Active alarms
No alarm
up to 15 alarms
(see table
below)
Up to 15 possible alarms listed by arrow up/down
Reset alarms Reset all actual alarms
Log history View log history
Clear log
history Clear log history
Login Password *** 200 N/A
Start Turn On Main swith ON
Turn Off Main swith OFF
Parameters Unit config
Compressor
0 sec 100 sec 20 sec SDT (Compressor start delay) CM2
5 min 2000
min 45 min PDT (Pull down time) CM3
180 min 2000
min
1440
min CST (Cycle time) CM4
24 hours 768
hours
160
hours PLT (Endless purging max time) VA5
Limits settings
0 bar 5 bar 0.5 bar Comp Diff (Hysteresis min allowed ammonia pressure) CM5
0 bar 12 bar 6.5 bar Setpoint (Min allowed ammonia pressure) CM1
Input/Output Input / Output Display & Config

User Guide |Intelligent Purging System (IPS 8) for Ammonia - Technical data, installation and use
© Danfoss | DCS (ms) | 2020.01 BC306932151284en-000201 | 19
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 Indicates no signal from temperature sensor
(R452a) Broken wire to R452a temperature sensor Repair temperature sensor wire or replace temperature sensor
E01 Temp Sensor Fault Indicates no signal from temperature sensor
(R452a)
Electrical supply failure supplying R452a
temperature sensor Repair or replace power source
E01 Temp Sensor Fault Indicates no signal from temperature sensor
(R452a)
Temperature measurement of the R452a line
is out of range
Compare temperature with another
temperature sensor reading and replace
temperature sensor if needed
E02 BPL Sensor Fault Indicates no signal from pressure transmitter
(R452a) Broken wire to R452A pressure transmitter Repair pressure transmitter wire or replace pressure transmitter
E02 BPL Sensor Fault Indicates no signal from pressure transmitter
(R452a)
Electrical supply failure to the R422a pressure
transmitter Repair or replace power source
E02 BPL Sensor Fault Indicates no signal from pressure transmitter
(R452a)
Pressure measurement of the R452a line is out
of range
Compare pressure with another pressure
reading and replace pressure transmitter if
needed
E03 BPL Sensor Fault Indicates no signal from pressure transmitter
(R717) Broken wire to R717 pressure transmitter Repair pressure transmitter wire or replace pressure transmitter
E03 BPL Sensor Fault Indicates no signal from pressure transmitter
(R717)
Electrical supply failure to the R717 pressure
transmitter Repair or replace power source
E03 BPL Sensor Fault Indicates no signal from pressure transmitter
(R717)
Pressure measurement of the R717 line is out
of range
Compare pressure with another pressure
reading and replace pressure transmitter if
needed
E04 Low temperature Indicates too low ambient temperature
(<-10 °C) Too low ambient temperature Move the IPS to a higher ambient temperature
E05 High temperature Indicates too high ambient temperature
(>120 °C) Too high ambient temperature Move the IPS to a lower ambient 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 R717 pressure Closed stop valve Open inlet stop valve
E07 High pressure BPL Indicates too high R717 pressure Ammonia system pressure too high Wait for lower pressure
E08 Low pressure BPH Indicates too low R452a pressure Low R452A charge Find and repair leak, evacuate and recharge
with R452a
E09 High pressure BPH Indicates too high R452a pressure R452s system pressure too high Wait for lower pressure
E10 System is OFF Indicates status of the main switch Main switch is OFF Switch ON the main switch
E11 Memory is full A memory reset is required Memory is full from long time operation Clean MCX memory by means of finding
Parameters_UnitConfig_
E12 Totla purge time error This occurs when PLT is activated System will
automatically restart when CST has expired Restrictor is blocked Replace the restrictor
E13 Compressor ERROR Indicates no status is being received from
relay KL01 Possible broken wire from the MCX Repair broken wire from the MCX
E14 Liquid alarm Signal from the LLS that there is liquid in the
evaporator
E15 Memory wrong! Wrong counter values The unit will
automatically repair itself
E16 Discharge sensor error Indicates no signal from temperature sensor
E17 Suction sensor error Indicates no signal from temperature sensor
Table 03
Occurring active alarms, possible reasons and recommended action
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)

User Guide |Intelligent Purging System (IPS 8) for Ammonia - Technical data, installation and use
20 | BC306932151284en-000201 © Danfoss | DCS (ms) | 2020.01
Modbus RTU
Table 04
Modbus RTU Registers
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.
Register Parameter Name Description User
Level Min Value Max Value Default Value
Unit/
Type
Read/
Write
Modbus
Function
Code
Modbus
Data Type
Persistent
Yes/No
GENERAL > SETUP
3001 ON/OFF 0: Main switch off
1: Main switch on 2 0 1 1 Enum 1 RW 3/6 Short Yes
3002 Activate Multipurger
Switch on/off
multipurging
functionality
0: No
1: Yes, switch on
multipurging
functionality
2 0 1 1 Enum 2 RW 3/6 Short Yes
3003 Restore default
parameters
0: No
1: Yes, restore default
parameters
2 0 1 0 Enum 2 RW 3/6 Short Yes
GENERAL >
CONFIGURATION
3004 Buzzer activation time Time in which buzzer
is on for in minutes 3 0 15 1 min RW 3/6 Short Yes
3005 Alarm relay activation
delay
Delay in which alarm
is active after relay
activated
3 0 999 0 s RW 3/6 Short Yes
3006 Alarm relay active if
unit in OFF
0: No
1: Yes 3 0 1 1 Enum 2 RW 3/6 Short Yes
GENERAL > SERIAL
SETTINGS
3007 Serial address (Modbus
and CAN) 2 1 100 1 N/A RW 3/6 Short Yes
3008 Serial baudrate
(Modbus)
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
2 0 8 6 Enum 3 RW 3/6 Short Yes
3009 Serial settings
(Modbus)
0: 8N1
1: 8E1
2: 8N2
2 0 2 1 Enum 4 RW 3/6 Short Yes
GENERAL >
PASSWORD
3010 Password level 1 password for user
level 1 3 0 999 100 N/A RW 3/6 Short Yes
3011 Password level 2 password for user
level 2 3 0 999 200 N/A RW 3/6 Short Yes
3012 Advanced Setting -
Password level 3
Recommend default
setting only 3 0 999 N/A N/A RW 3/6 Short Yes