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MANDÍK CPV Installation, commissioning, and maintenance
9.9 HOT WATER COIL, COLD WATER COIL
The surface temperature of the hot water coil and media conditions when in use may exceed
a safe contact temperature of 60°C. Before intervening or beginning any work in the
chamber, wait for the heat exchanger and connections to cool sufficiently.
Contact between bare skin and the heat transfer medium must be avoided when filling,
draining, and venting heat exchangers. When using additives or complete finished mixtures
for heating or cooling systems, follow all information provided by their manufacturers for the
use and handling of such substances.
Check heat exchangers for contamination, leaks and any damage. Remove any contaminants by
blowing down with compressed air or steam. In any case, ensure that the fins of the heat
exchanger are not damaged. and therefore high-pressure compressed air equipment should not
be used for such work.
Regularly check the connecting pipe for leaks and the functionality of all venting valves.
Independently of the defined maintenance intervals, and always before colder periods of the
year, check the functionality of all freeze protection devices, including a check of the antifreeze
solution concentration. Drain all the medium from cold water coils before winter and from all
heat exchangers prior to extended shut-downs (if not filled with an antifreeze solution of a
sufficient concentration). Draining of the medium does not guarantee that all liquid has been
drained from the heat exchanger and the heat exchanger must always be purged subsequently
using compressed air!
For cold water coils, also check the condition and operation of all condensate pans, the
functionality of the pan drains and the condition and functionality of the trap, and then clean
and fill with water as needed. Before winter, check the functionality of all freeze protection
measures for the condensate drain (if operated during winter and there is the potential for
them to freeze). Check for any deposits or other settled materials, and the condition and
cleanliness of the drip eliminator, which is to be removed and cleaned as needed.
9.10 CONDENSER COIL, DIRECT EVAPORATOR COIL
The surface temperature of the hot water coil and media conditions when in use may exceed
a safe contact temperature of 60°C. Before intervening or beginning any work in the
chamber, wait for the heat exchanger and connections to cool sufficiently!
Prevent contact between skin, the mucus membranes or eyes and the refrigerant when
performing any work on refrigeration systems. Use personal protective equipment and
breathing devices provided at the entrance to the mechanical room if a refrigerant leak is
detected. The refrigerant or compressor oil may be toxic or cause an allergic reaction. Air and
refrigerant may form an explosive mixture, and refrigerant components may be heavier than
air and displace oxygen in areas occupied by personnel. Always follow the instructions
provided in the material safety data sheets for these substances!
Service activities involving refrigerant circuits, such as topping up or replacing refrigerant,
replacing components in circuits (filter/dehydrators, expansion valves, pressure sensors, etc.)
38
IZU 06/2021
MANDÍK, a.s., www.mandik.cz
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