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KXR4 piping/PFD controller
PFD refrigerant flow branch controller
(1 to 1 and 4 to 1 connection)
Model No.
PFD112-ER
PFD180-ER
PFD280-ER
PFD112X4-ER
Maximum downstream indoor unit capacity
11.1kW
17.9kW
28.0kW
37.0kW
• The PFD branch controller permits free design of simultaneous heating and cooling of indoor units. Each unit or group of units connected to the PFD controller can
operate in it's individual mode irrespective of the demands of other areas of the building. The new design PFD refrigerant circuit includes an additional solenoid valve and
capillary that reduces pressure difference and eliminates refrigerant noise during mode change over (cooling - heating - cooling).
Easy installation
New PFD design means the
connection of the indoor unit liquid
pipe is made directly to the liquid line
- bypassing the PFD. This means (x2)
less pipe connections per indoor unit,
reducing installation time and cost.
Outdoor unit
suction gas pipe
discharge gas pipe
PFD
controller
gas pipe
Indoor unit
PFD pipe connections
liquid pipe
The PFD is connected to the indoor
unit by 3 core signal wire via a relay
kit (supplied) to be located within 2m
of each other.
The indoor unit however can be up to
40m away. Power to the PFD can be
connected from the indoor unit or
other supply.
PFD
Power cable 240v AC
relay kit
240v AC
12v AC
up to 2m
up to 40m
Indoor unit
PFD wiring connection
Relay kit
Groups of indoor units can be connected (up to a total
capacity 37.1kW) to a single PFD with branch piping
and all units in that group will operate in the same
mode only (cooling or heating).
Now MHI also introduces the 4-way PFD controller
PFD112X4 which can connect up to four indoor units
with individual control - simultaneous cooling or
heating.
Branch controller Total downstream capacity Connectable indoor units
PFD112-ER less than 11.2kW 1-5
PFD180-ER less than 18.0kW 1-8
PFD280-ER less than 28.0kW 1-10
PFD112X4-ER less than 37.1kW Up to 16
PFD112-ER PFD112-ER PFD112X4-ER
PFD112-ER
4-Way PFD box
90 56 36 56
36 90
28 90
see page 40-41 for further
examples of piping arrangements
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