Heat Exchange Solutions
MC TC R EPS ENG 03 2018 MC TC R EPS ENG 03 2018
ThermoKey Technical Manual TC Instruction and technical data
1817
EN
TC 8.9
Provide for the periodic inspection and cleaning of the water distribution system. Do not use aggressive detergents,
solvents, acid or alkaline solutions containing chlorine or ammonia, or abrasives in general. If sanitising agents must be
used, check their compatibility with the materials first. The nozzles are removable for programmed cleaning, and can
be washed with substances suitable for removing the deposited limescale. If in any doubt, contact the Manufacturer.
TC 8.10
The frequency of inspection and maintenance operations is dependent on the environmental characteristics and on
the specific characteristics of the feed water and any treatments used, and therefore must be defined on an individual
basis.
TC 8.11
To guarantee the maximum efficacy of the EPS system, check that the operating parameters, namely the measurements
of relative humidity, ambient temperature, and air output temperature from the panel conform to the expected
characteristics of the product selected.
TC 8.12
If proceeding with the replacement of worn panels, contact the Manufacturer for replacement materials.
TC 8.13
Provide for the checking of the chemical and microbiological parameters of the water used in the EPS system
before every period of operation, and programme the frequency of inspections so as to maintain the characteristics
required (see chapter on characteristics of the water).
TC 8.14
For any operation on the product not described in this manual, contact the Manufacturer.
TC 8.15
For the cleaning of the heat exchangers see the technical manual IS.
TC 9. Practical conditions of use
TC 9.1
The water used for the adiabatic system with evaporative EPS panel does not require specific treatments. However,
for a longer lifespan and more efficient operation of the evaporator panel and reduction of maintenance work, it is
suggested to use water with the characteristics indicated in the table.
REFERENCE WATER PARAMETERS FOR EPS SYSTEM
pH (@25°C) 6.5 ... 8.0
Total hardness 3.5 ... 4.0 °d (1°d = 17,85 ppm CaCO3, 1°f = 10mg/l = 10 ppm
CaCO3)
El. Conductivity (@25°C) < 1500 mS/cm
Chlorides < 50.0 mg/l
Sulfates < 90.0 mg/l
Nitrates < 50.0 mg/l
Silicon < 20.0 mg/l
Iron dissolved < 0.1 mg/l
To avoid spontaneous corrosion and/or incrustation, the Langelier saturation index (IL) and the
Ryznar stability index (IR) should be within the following range: IL -1 ... +1 / IR 5.5 ... 6.6
TC 9.2
Water shared by the common water network or water derived from other water resources can be used, possibly to
be treated appropriately with the expectations of material durability and cost of treatment, but measures must be
taken for all chemical and microbiological parameters directly related to health in compliance with the current
legislation and Directive 98/83 / EC. In accordance with what is stated in the use and maintenance manual, the
Thermokey Adiabatic Evaporative System is in compliance with the requirements of VDI 2047-2.
TC 9.3
The feed water should never get down below the minimum level of pH 5 and overcome the maximum level of pH 9,
in order to avoid problems of chemical aggression to the panels. Water hardness should never exceeding 250 ppm
CaCO3. In the event that the system is configured to recirculate the water, purging cycles should be performed in
order to prevent the salinity level exceeding the acceptable limits.
TC 9.4
The installer must ensure that the treatments and chemical substances added, in order to respect the parameters
indicated, are compatible and do not cause any corrosion and damage to the materials used in the module. If necessary,
the water used must be conditioned by the addition of suitable inhibitors of corrosion and incrustation
TC 9.5
Do not routinely add oxidising agents to the feed water as this can create problems for the cellulose sheet of
the panel. If necessary, endeavour to use them only in minimal quantities: max 1 ppm in the case of continued
treatment, or max 5 ppm in the case of a one-time treatment.
