Commissioning the run around coil system
Personnel:
HVAC technician
Protective equipment:
Industrial safety helmet
Protective clothing
Protective gloves
Safety shoes
Ensure that the maximum pressure values given in
the technical data are not exceeded.
Use appropriate measures to protect the water
system from frost. Frost protection can be achieved
with a water glycol mixture or with a special anti-frost
thermostat.
Optimum ventilation
For the best possible ventilation, we recommend the
installation of ventilation equipment by others at the
highest point of the system, see
connecting the hydraulic unit’ on page 39 .
1.
Ensure that the flow and return connections are
correct.
2.
Check that fittings are correctly installed.
3.
Flush the system to remove any contamination.
4.
Check the run around coil system for leaks.
5.
Open vents (unless automatic vents are installed).
6.
For glycol water mixtures we recommend
ready-to-use formulations. See the order-spe-
cific air handling unit data sheet from TROX for
the mixing ratio.
The correct mixing ratio is important:
–
Too much glycol will impair performance
–
Too little glycol may lead to frost damage
Only use one of the following glycols for the air
handling unit:
–
Propylene glycol
–
Ethylene glycol
Slowly pour the heat transfer fluid into the heat
exchanger at the lowest point in the system. As
you fill the system, check that all external and
internal screw joints and connections are tight.
7.
Vent the heating coil/cooling by opening the upper
spigot and the bleed screw.
If the air heater is not properly vented, air bub-
bles may form and impair the performance.
8.
Close any vents.
9.
Clean the condensate drip tray and drain.
10.
Set up the droplet eliminator.
11.
Fill the drain trap with water.
NOTICE!
Risk of damage to property!
–
When you tighten thread connections, be sure to
use a suitable tool (e.g. water pump pliers) to
counter the tightening force as otherwise you
may inadvertently damage the parts.
12.
Check the flange screw joints and tighten them if
necessary.
ð
The run around coil system has been set up.
6.3.6 Multileaf dampers
Movable parts of multileaf dampers
WARNING!
Crushing hazard from movable parts!
Closing multileaf dampers may crush your hands
and arms.
–
Do not reach between the damper blades.
–
Prevent access to crush points: Either install
dampers on ducts or use fixed guards.
–
Before you open an inspection access door,
switch off the air handling unit and secure it
against being switched on accidentally.
Setting up multileaf dampers
Set the AHU control system in such a way that the fan
does not operate against a closed damper.
TROX does not accept liability for damages resulting
from incorrect operation. To prevent damage due to
pressure surges from fire dampers, pressure relief
dampers should be installed.
TROX cannot guarantee leak-free dampers if the
actuators are provided and installed by others.
Initial commissioning
Setting up and adjusting AHU casing units > Multileaf dampers
Air handling unit X-CUBE Ex
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