
Pipe connections
General
Pipes and other cold surfaces must be insulated with
diffusion-proof material to prevent condensation.
Where the cooling demand is high, fan convectors with
drip trays and drain connection are needed.
The brine circuit must be supplied with a pressure ex-
pansion vessel. If there is already a level vessel installed
this should be replaced.
Non-return valve
Install a non-return valve (RM22) between two T-pipe
connections to the mixing valve for the heat dump (see
the outline diagram).
Mixing valve, cooling dump
The mixing valve (QN18) is located in the brine system
via the T-pipe connections according to the outline
diagram.
■Connect the brine out from the heat
pump after reversing valve (QN12) via T-
pipes to port A on the mixing valve (opens
at increase signal).
■Connect the return line from the cooling
system to the common port AB on the
mixing valve (always open).
■Connect the brine in to the heat pump from the col-
lector via the T-pipe to port B on the mixing valve
(closes at reduce signal).
Mixing valve, heat dump
The mixing valve (QN36) is located in the climate system
on the flow line from the heat pump via the T-pipe
connections according to the outline diagram.
■Connect the flow line to the circula-
tion pump, heat dump (GP20) and
convection fan to the common port
AB on the mixing valve (always open).
■Connect the flow line to the climate
system to port A on the mixing valve (opens at in-
crease signal)
■Connect the return line from the convection fan to
the flow line to the climate system via the T-pipe to
port B on the mixing valve (closes at reduce signal).
Reversing valve, cooling/heating
The three way valve (QN12) is located in the brine sys-
tem on the flow line from the heat pump according to
the outline diagram.
■Connect the flow line to the cooling system
to port A on the reversing valve (open at
signal).
■Connect the brine out from the heat pump
to the common port AB on the reversing
valve (always open).
■Connect the brine out to the collector to
port B on the reversing valve (normally open, motor
in stand-by mode).
Circulation pump, heat dump
Install the extra circulation pump (GP20) after the
mixing valve for the heat dump (QN36) on the flow
line to the convection fan.
Volume vessel
Install the volume vessel (CP21) for cooling between
reversing valve (QN12), mixing valve (QN18) and cool-
ing system.
Temperature sensor
■Temperature sensor (BT57) is mounted on the return
to the heat pump in the collector after the T-pipe
connection from the cooling system return via mixing
valve (QN18).
■Temperature sensor (BT64) is mounted on the flow
line to the cooling system at the T-pipe connection
to the volume vessel (CP21).
■The temperature sensor (BT75) is located on the flow
line to the climate system after the heat dump.
Install the temperature sensors with cable ties with the
heat conducting paste and aluminium tape. Then insu-
late with supplied insulation tape.
NOTE
Sensor and communication cables must not
be placed near power cables.
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