Hydraulic Connection; Cold Water Connection - Windhager AquaWIN Air 273 Montage- Und Bedienungsanleitung

Overview

6. Hydraulic connection

The use of a sanitary loop is strongly discouraged: this type of installation causes a destratification of
the water in the heater and results in the increased operation of the heat pump as well as the
electrical resistance
The cold water inlet is marked by a blue collar and the hot water outlet by a red collar. They have a gas thread
with a diameter of 20/27 (3/4").
For areas with very calcareous water (Th>20°f), it is best to treat it with a softener, the hardness of the water
must remain above 8°f. The softener will not affect the warranty of our product, provided that it is approved
for use in France and complies with current regulations and industry standards and is checked and maintained
regularly.
The aggressiveness criteria must comply with those defined in DTU 60.1.

6.1. Cold water connection

Before proceeding with the hydraulic connection, check that the water mains pipes are clean.
The installation must be carried out using a safety unit calibrated at 7 bar (0.7 MPa) (not supplied), new,
compliant with the NF EN 1487 standard and directly connected to the water heater's cold water connection.
No element (shut-off valve, pressure reducer, hose, etc.) is to be placed between the safety unit and
the cold water tap of the water heater.
As water can flow from the discharge pipe of the
pressure relief device, the discharge pipe must be
kept in the open air. Regardless of the type of
installation, it must include a shut-off valve on the
cold water supply, upstream of the safety unit.
The safety unit discharge must be connected to free-
flowing waste water via a siphon. It must be installed
in a frost-free environment. The safety unit must be
put into operation regularly (once or twice a month).
The installation must have a pressure reducer if the
supply pressure is greater than 0.5 MPa (5 bar). The
pressure reducer must be installed by the general
distribution (upstream of the safety unit). A pressure
of 0.3 to 0.4 MPa (3 to 4 bar) is recommended.
Safety unit
Cold water
inlet
Siphon
Installation
YES
Use Maintenance
Pressure
reducer
Warranty
NO
Water mains
inlet
YES
EN
135