User Guide
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Intelligent Purger System (IPS) for Ammonia - Technical data, installation, and use
© Danfoss | DCS (hhr) | 2019.02
BC297731816824en-000101 | 148R9643
| 3
The Danfoss Intelligent Purger System (IPS)
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 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 .
The accumulation areas are identified in the
Connection locations section, along with
recommended connection principles .
The purger unit is an electronic-controlled, self-
employed R404A refrigerant system that runs
independent of the main ammonia system and
with only one flange connection to the ammonia
plant .
This flanged opening allows access of the
ammonia gas/NC gas mix to the purger
evaporator, where it is divided 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 a water bath .
Through the flanged opening, the purger unit
has access to all 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, removed .
To regain the design capacity of the main
ammonia system and prevent future air
accumulation, it is highly recommended to install
the Danfoss IPS .
Introduction
Features
• State-of-the-art electronic controlled unit
based on the Danfoss MCX controller platform .
• Reduced power consumption .
• Automatic purging response to NC gases in the
refrigeration system .
• Continuous monitoring of differential pressure
between system refrigerant and purger
refrigerant .
• Electronic purging that minimizes refrigerant
(ammonia) relief to the environment .
• Self-contained unit operation, which functions
independently from the main plant .
• An operation log for easy purging cycle data
monitoring .
• Self-diagnostics for unit and system operation
to shut down in case of malfunction of air
purger components .
• Cost-effective installation with few mechanical
and electrical connection interfaces .
• A hermetic internal cooling system, which
minimizes leakage risks .
• A plug-and-play stand-alone design, which
eases installation and commissioning with low
risk of potential errors .
• No need for advanced settings .
• A compact and easy-to-handle design .
• Patent pending on IPS .
