Duty Range
The IPAC range has been developed to
provide a flexible duty range of units.
● Stand alone units currently range
from a nominal 15 kW to 80 kW.
● Master/Slave combinations extend
the range for larger applications.
Precision Air Control Equipment
The IPAC floor standing units are in
their most basic form available in
chilled water or DX cooling only
configuration. These systems can either
be mounted inside the conditioned
space or mounted remotely, with the
fan developing external pressure to
transport the air to the conditioned
space. Units can be manufactured with
an upflow or downflow air pattern to
enable optimum comfort levels.
Depending on the application, heating,
dehumidification, humidification and
air filtration can also be provided.
As well as the standard unit
configurations, a variety of options can
be factory or site-fitted to customise
units to the system requirements. This
provides the designer, installer and
customer with a system that can
precisely match the requirements.
Controller
The Eaton-Williams controller is a
purpose designed LonWorks™
microprocessor, which fully complies
with EEC directives for electromagnetic
compatibility (EMC).
The controller is powered from a
9 V and 24 V 50 Hz power supply,
these are provided via a transformer
mounted within the electrical chassis.
All outputs are protected by shrouded
fuses.
The Controller Hardware
Consists of:
● Display and push-button assembly.
● Microprocessor controller assembly.
The Controller Includes the
Following Features as Standard:
● Temperature and humidity set point
adjustment.
● Dead band adjustment.
● Proportional band adjustment.
● Alarm band adjustment (individually
for temperature and humidity).
● Fault and service alarm volt-free
contacts.
● Winter low pressure switch delay
timer adjustment.
● Start delay timers.
● Historical alarm logging.
● Lon network communications.
● Stand-alone or Master/Slave.
● Run/Standby and duty rotations.
Temperature Control
IPAC units are designed to operate at
room temperatures from 18 °C to
30 °C as standard and with factory
added options can operate outside this
range. Temperature can be precisely
controlled, with cooling provided by a
chilled water system or a DX unit with
an external air-cooled condenser
(option of water-cooled condenser
available). Where heating is required,
the alternatives of electric or low
pressure hot water heating are
available.
Humidity Control
Where humidity control is required, the
IPAC unit is factory fitted with the
facility whereby the cooling coil is
operated below the dew point of the
conditioned air to provide
dehumidification. To ensure optimum
temperature control in conjunction
with dehumidification the options of
hot gas or electric reheat are available.
The unit can also be fitted with a
proportional output humidifier to
provide clean sterile steam. The
humidifier responds to a changing
demand using the water level (WL)
system of modulation. Output is varied
by increasing or decreasing the level of
water in the cylinder. A decrease in
water volume causes less electrical
energy (measured in amperes) to pass
between the electrodes, transforming
less water into steam. An increase in
water volume, logically, has the
opposite effect. WL can modulate
down to 20 % of full output.
(2 pages)
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