STIEBEL ELTRON HPA-O 7 S Premium - Heating Water Connection; Flow and Return Connection; Fitting the Push-Fit Connectors

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10.2 Heating water connection
!
Material losses
The heating system to which the heat pump is connected
must be installed by a qualified contractor in accordance
with the water installation drawings that are part of the
technical guide.
To facilitate connection to the heating system, push-fit connectors
are enclosed with the appliance (see chapter "Fitting the push-fit
connectors").
 Before connecting the heat pump, flush the pipework thor-
oughly with suitable water. Foreign bodies, such as welding
pearls, rust, sand or sealant can impair the operational relia-
bility of the heat pump.
 Connect the heat pump on the heating side. Check for
tightness.
 Ensure that the heating flow and return are connected
correctly.
 Provide thermal insulation in accordance with applicable
regulations.
 When sizing the heating circuit, observe the internal pressure
differential (see chapter "Specification/ Data table").
10.3 Flow and return connection
!
Material losses
In cooling mode, condensate can form when the dew
point temperature is undershot.
 Take suitable measures to prevent the formation of
condensate.
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2
1
3
4
1 Heating flow
2 Heating return
3 Drain
4 Ventilation
 Connect the heat pump to the heating circuit. Check for
tightness.
10.4 Fitting the push-fit connectors
Note
The plastic push-fit connectors are not suitable for instal-
lation in the DHW line or the solar circuit.
 Install the push-fit connectors only in the heating
circuit.
!
Material losses
Tighten the screw cap of the push-fit connector by hand.
Never use a tool.
!
Material losses
To ensure the push-fit connector is held securely, pipes
with a surface hardness>225HV (e.g. stainless steel)
must have a groove.
 Using a pipe cutter, cut a groove (depth ap-
prox.0.1mm) at a defined distance from the end of
the pipe.
- Pipe diameter 22mm: 17±0.5mm
- Pipe diameter 28mm: 21±0.5mm
How the push-fit connectors work
The push-fit connectors are equipped with a retainer with stain-
less steel serrations and an O-ring for sealing. The push-fit con-
nectors also have a "twist and secure" function. Simply turning
the screw cap by hand will secure the pipe in the connector and
push the O-ring against the pipe to seal it.
Making the push-fit connection
The connector must be in its relaxed position before the pipe is
inserted. In this position, there is a small gap between the screw
cap and main body.
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3
1
2
4
1 Retainer
2 Screw cap
3 Gap between screw cap and main body
4 Main body
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Pipe Ø 28 mm
Depth of insertion A max. 44mm