2
x
Set-up and installation
26
FA ROTEX HPSU compact 308 - 02/2012
2.5
Laying refrigerant lines
• Check whether oil raise arc necessary.
– Required when HPSU compact not installed on same level as external unit.
– An oil raise arc must be installed for every 10 m of height difference
(fig. 2-34, H = distance from one oil raise arc to another).
– Oil raise arc only required in the gas line.
• Install lines with bending unit and an adequate clearance to electrical
lines.
• Only solder with light nitrogen flow (hard soldering only).
• Do not apply insulation to joins until after start-up (for purposes of
leakage search).
• Establish flange connections and connect to the units.
(
Pay attention to the tightening torque, see chapter 6.3 "Tight-
ening torque").
A
Exterior heat pump unit (RRLQ)
B
HPSU compact
C
Gas line
D
Liquid line
E
Oil raise arc
H
Height to the 1
st
oil trap (10 m)
Fig. 2-34 Oil raise arc refrigerant line
2.6
Pressure test and vacuum
• 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 reached 1 mbar absolute.
– Time: minimum 1 h
• Check whether additional refrigerant 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 temperature probes are inserted to a depth of t
DHW1
and t
DHW2
80 cm.
