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IOM_WPHBA-WPHA_091a1201_207954_180610_EN
COMPACT HORIZONTAL PACKAGED WATER-TO-AIR UNITS
WPHBA / WPHA
INSTALLATION
HYDRAULIC INSTALLATION
The selection of the components and the installation shall be made by a qualified installer according to the valid local
legislation and the good practice rules.
Make sure that you are aware of all the local rules and regulations for hydraulic installations and that you comply with
them.
The design and calculation of the pipes shall be realised keeping in mind that the pressure drop of the installation shall
never exceed the pressure drop that would overcome the pump of the installation. A wrong design with inadequate
pressure drops in the section pipes that lead to the indoor units would entail the malfunction of some of them.
The installation shall be completed according to the hydraulic connection diagram (please refer to the below shown
diagram).
Proceed to the installation of a water filter that is provided with an inner net to retain the particles with a maximum
diameter of 0.5mm.
A proper maintenance of the filter and the flow switch at an appropriate periodicity shall be completed to avoid deposits
that could block them.
Comply with the stated indications regarding the water inlet and outlet of the unit and install a by-pass valve if necessary.
WATER FILLING
Use water at around 20ºC to fill the hydraulic circuit. After the system has been drained, the pressure level must be as
stated in the installation project or according to the pressure level of the main installation. In case when the water installation
of the unit is going to be added to an existing water installation, the main installation probably will comprise a filling system
already.
Attention: An expansion tank with a bigger capacity will be required according to the filled water volume.
Drainage
Verify that all the high points of the installation are provided with a bleed valve.
Use the pump during one minute, stop it and drain the circuit (if manual). Wait for another minute and repeat the same
process until there is no more water. 5 to 10 processes like this one may be necessary to drain the system completely for
water.
Remember to drain any other components that include tubes where there might be air pockets (example: differential
switch). They will not work properly with air.
Air in the circuit will produce noises, will entail a lower water flow and a bad performance of the exchanger, etc
…
Risk of frost
If the unit or the water installation are exposed to temperatures around 4°C it is necessary to take the appropriate measures
against the risk of frost.
For example:
Mix the water of the installation with glycol.
Protect the pipes with heating cables placed under the insulation lining.
Empty the installation and control at the same time that:
There are no closed valves that may retain water even after draining the installation.
There are no low spots where water may stagnate even after draining; if necessary proceed to purging the installation.
Glycol additions
Keep in mind that the use of glycol solutions increases the pressure drop.
Make sure that the type of glycol you will use is compatible with hydraulic circuit components (pumps, filters, etc.) and that
it is a non-corrosive product.
GLYCOL ADDITION to WATER (%)
0ºC
-2ºC
-5ºC
-10ºC
-15ºC
-20ºC
-25ºC
-30ºC
ETHYLENE GLYCOL
0%
6%
14%
24%
31%
36%
41%
45%
PROPYLENE GLYCOL
0%
7%
15%
25%
33%
39%
44%
48%
Make sure that the freezing temperature is below the minimum temperature that the water may reach with a security margin
even when the unit is OFF.
Содержание VERNE WPHA 091
Страница 54: ...Subject to modifications without prior notice...
