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IOM_WPHBA HE-WPHA HE_091a1201_207815_180701_EN
HORIZONTAL WATER-AIR COMPACT PACKAGED UNITS
WPHA HE / WPHBA HE
INSTALLATION
INSTALLATION OF WATER PIPES
Preliminary information
The selection and installation of the components of the installation have to be done by a qualified installer, respecting the
current legislation of the place of the work and standards of good practice.
The design and calculations of the pipes will be made in a way that the pressure drop of the installation never surpass the
one that could beat the incorporated pump of the unit. Moreover, a bad design of the pressure drops of the pipes that
connect with the indoor units may cause the wrong operation of some of them.
Components
-
Shut-off valves:
Installed at the entry and exit of every component, they allow to do the maintenance operations
without emptying the installation.
-
Thermometers and manometers:
Installed at the entrance and the exit of the principal elements. Ease the
maintenance and control operations.
-
Steam traps:
Installed at the highest points of the installation. Allow the air purge of the circuit.
-
Drain keys:
Install them in all low points of the circuit to allow their emptying.
-
Supports:
The weight of the pipes must not be supported by the connections of the unit. Therefore, flexible elements
will be installed to prevent it.
-
Expansion tank:
Keeps the correct pressure of the installation. It is recommended to fill it at 2.15 bars, when the
water temperature changes from cold to pump and vice-versa. The expansion tank has to be sized depending on the
content of water of the installation.
In special circumstances may be necessary to install one or more additional tanks even when the unit has already one.
Safety elements
The installation of the following safety elements is
MANDATORY
when they
ARE NOT
incorporated as standard at the
unit. Its non-compliance will cause the
LOSS OF WARRANTY
.
Water filter
The water filter will be installed and must contain a mesh inside to retain particles with a diameter not greater than
Ø> 0.5mm
At the water inlet of the unit, to protect the heat exchanger or other critical components from obstructions.
Flow switch or differential pressure switch
Water heat exchanger protection from breaks due to an insufficient water flow and can cause the total disqualification
of the unit.
It is mandatory to install the flow switch at the water outlet of the unit, with a horizontal stretch of 6Ø inlet and 5Ø
posterior of horizontal length, without section changes at the stretch to ensure the laminar regime of the water/fluid
flow. In case of placing flow switches that are not supplied by HITECSA, follow the manufacturer instructions, provided
that the aforementioned lengths do not decrease.
Risk of frost
If the unit or the corresponding hydraulic connection depend on the temperatures close to 4 ºC, take the convenient
measures to prevent the risk of frosts.
For example:
Mix the installation water with glycol.
Protect the pipes with warming cables placed below the insulation
Empty the installation checking that:
There is no closed keys that may retain water even after the emptying.
There is no low points which water can hold back even after the emptying, make a blowing if necessary.
Glycol additions
Take into account the use of glycol solutions increases the pressure drop. Make sure the type of glycol used is compatible
with the components of the hydraulic circuit (pumps, filter keys, etc.).
