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Cooling coil efficiency adjustments are carried out after having determined the adequate
air capacity flowing through units.
The cooling coil efficiency is adjusted by the change in water supply temperature. This is achieved
by mixing the supply water at low temperature with water at higher temperature returning from
the cooling coil, in a 3-way valve. Once mixed the cooling coil supplying water reaches an adequate
temperature depending on the degree of mixing. External conditions close to measuring conditions
occur in a year-cycle within a relatively short time. In most cases, this involves adjustments to be
carried out in intermediate conditions, for which adequate conversion rate to design parameters
should be used.
If, based on the design, measurement uncertainty for air temperature behind cooling
coil has not been defined otherwise than in PN-EN 12599-2002 this value shall be
considered correct, even if it exceeds ±2°C of the designed value.
14.4. ADJUSTING FREON EVAPORATION COIL
Coil adjustment involves checking the effect of its operation from the air side through air temperature
measurements taken in front and behind the coil, cooling medium evaporation temperature, as
designed.
The coil efficiency adjustments are carried out after having determined the adequate air
capacity flowing through units.
The coil efficiency is adjusted by the change in cooling medium evaporation temperature. External
conditions close to measuring conditions occur in a year-cycle within a relatively short time. In most
cases, this involves adjustments to be carried out in intermediate conditions, for which adequate
conversion rate to design parameters should be used.
If, based on the design, measurement uncertainty for air temperature behind cooling
coil has not been defined otherwise than in PN-EN 12599-2002 this value shall be
considered correct, even if it exceeds ±2°C of the designed value.
15. USE AND MAINTENANCE
Personnel in charge of the unit operation should learn the instruction manual herein
before any use and maintenance. If no personnel of the required technical qualifications
is available, on-going inspections of the units should be carried out by JUWENT
Authorized Service..
Any and all damages to the unit and its parts resulting from failure to follow the
guidelines in the documentation shall not be subject to repairs under the warranty. Basic
technical data of the units such as type, types and dimensions of components (filters,
heat exchangers, fans, electric motors) are included in the data sheet delivered with any
and all devices.
Any service works on the unit should be carried out only with the device shut off. In
order to ensure safe operation of the device make sure to install a service switch outside
the base section to cut off the power supply to fan motors during service works.
Disconnection of the power supply circuit must take place with the de-energized device.
Careful, regular maintenance and control of technical condition of the unit and its
equipment is necessary to find any incompatibilities on an early stage before major
damages occur.
