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IOM_WPVBZ HE-WPVZ HE_401-1201-4002_208110_200901_EN
PACKAGED COMPACT VERTICAL
– WATER / AIR
WPVBZ HE / WPVZ HE
INSTALLATION
WATER INSTALLATION
The selection and installation of the components of the installation must be carried out by a qualified installer, respecting
the current legislation at the place of work and rules of good practice.
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 pipes shall be carried out in such a way that the pressure drop of the installation never
exceeds that which can overcome the pump built into the unit. In addition, a poor design of the pressure drop of the
branch pipes that go to the indoor units can cause the malfunction of some of them.
Proceed to the installation of a water filter that is provided with an inner net to retain the particles with a maximum
diameter of 0.5 mm.
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.
Purging
Verify that all the high points of the installation are provided with a bleed valve.
Operate the pump during one minute and stop it. Wait for one minute more and repeat the same process until there is no
more air in the system. 5 to 10 operations may be necessary.
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 below 5°C it is necessary to take the appropriate measures
against the risk of frost (Please refer to the Safety Precautions section).
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.
- Low spots where water may stagnate even after draining; if necessary proceed to blowing 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 (%)
TARGET FREEZING TEMPERATURE
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 lower than the minimum temperature that the water may reach keeping a
security margin even when the unit is Off.
