Pressure Test And Filling The Coolant Circuit; Filling The System With Water; Checking The Water Quality And Adjusting The Pressure Gauge; Filling The Hot Water Heat Exchanger - Rotex HPSU compact 304 Installation And Maintenance Manual

A Exterior heat pump unit (RRLQ)
B ROTEX HPSU compact
C Gas line
D Liquid line
E Oil trap arc
H Height to 1st oil trap (max. 10 m)
H Height difference between heat pump exterior unit and heat pump
O
interior unit.
Fig. 4-37 Oil trap arc coolant line

4.6 Pressure test and filling the coolant circuit

RISK OF ENVIRONMENTAL DAMAGE!
Important information regarding the coolant used.
The complete heat pump system contains refrigerant
with fluorinated greenhouse gases which damage the
environment if released.
Coolant type: R410A
GWP* value: 2087,5
* GWP = Global Warning Potential
Fill in the total coolant filling quantity on the
supplied lable on the heat pump exterior unit (for
information consult the installation instructions for
the heat pump exterior unit).
Never allow coolant to be released into the atmos-
phere - always suction it off and recycle using a
suitable recycling device.
FA ROTEX HPSU compact 4 - 06/2015
4 x Set-up and installation
Perform pressure test with nitrogen.
– Use nitrogen 4.0 or higher.
– Maximum 40 bar.
After leak search is complete, completely drain.
Vacuum lines.
– Pressure to be achieved: 1 mbar absolute.
– Time: minimum 1 h
Check whether additional coolant is needed for primer filling,
fill where necessary.
Open stop valve on exterior unit completely until the stop.
Tighten loosely.
Reassemble valve caps.
Check whether the storage tank temperature sensors t
and t are inserted to a depth of 80 cm.
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4.7 Filling the system with water

Do not fill the ROTEX HPSU compact until all installation activ-
ities have been completed, in the order shown as follows.
4.7.1 Checking the water quality and adjusting the
pressure gauge
Observe the information on the water connection and water
quality in accordance with section 4.3.
The correct minimum pressure marking must be set on the
pressure gauge installed by the customer before filling the
system for the first time:
Rotate the pressure gauge glass in such a way that the
minimum pressure mark corresponds to the system
height +2 m (1 m water column = 0.1 bar).

4.7.2 Filling the hot water heat exchanger

Open the shutoff valve for the cold water supply pipe.
Open the hot water tap connections so that the draw-off
volume can be set as high as possible.
Once water has been discharged from the tap connections,
do not interrupt the cold water flow; this will ensure that the
heat exchanger will be fully vented and that any impurities or
residue will be discharged.

4.7.3 Filling the storage tank

See chapter 7.4.

4.7.4 Filling the heating system

See chapter 7.5.
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