5
Liebert
®
PDX, EconoPhase Version - UM - 265133 - 29.08.2019
1.7 - Module Communications
The Liebert
®
PDX (room unit), Liebert MC™ (microchannel
condenser) and Liebert
®
EconoPhase (Pumped Refrigerant
Economizer) require communication when combined into a system.
This is done through a CANbus communication interface. A CANbus
cable must be connected from the Liebert
®
PDX at the designated
terminal(s) to TB49 on the Liebert
®
MC condenser board. If there is
an additional condenser, TB50 of the rst condenser will continue
out to TB49 on the second condenser.
In a system equipped with a Liebert
®
EconoPhase, the CANbus
cable must be connected from TB50 on the last condenser to TB49
on the Liebert
®
EconoPhase CANbus terminal block.
The two devices that are connected at the ends of the CANbus will
require termination to be set by jumper or plug. One end will be at
the last outdoor device in the connection chain; the other end of the
CANbus is either in the indoor unit or at a remote sensor. To
terminate, place a jumper on J6 Pins 1 and 2 on the Liebert
®
MC
condenser or Liebert
®
EconoPhase board. For other Liebert
®
iCOM boards directly associated with the indoor unit, terminate by
placing a jumper on P78 Pins 2 and 3.
See Fig. 5 for CANbus connections, jumper and DIP switch settings.
• Length Restrictions
• The indoor Liebert
®
PDX can be no more than 100m
from the condenser. The CAN communication cable can
be longer, but the total length should not exceed 150m
between the indoor Liebert
®
PDX unit and all outdoor
equipment.
• Cable Type
• Conductors-22-18AWG stranded, tinned copper
• Twisted pair (one pair is required for connection)
• Braided shield or foil shield with drain wire
• Low capacitance (<=15pF/ft)
• Cat5e or similar
• UL approved temperature rated to 75°C (167°F)
• UL approved voltage rated to 300V
• UV - and moisture - resistant if not run in conduit
• Plenum rated-NEC type CMP, if required by national or
local codes
• High Voltage Restrictions
• Do not run communications cable with high voltage cable.
• When routing cable, avoid laying, fastening or coiling
near or on high voltage wiring, conduit, or light ballasts.
Communication signals in equipment may be disturbed.
• Keep communications cable away from other electrical
noise sources.
• Environmental and Safety
• Vertiv
®
recommends routing cable inside conduit where
the cable exits the building to outdoor units, between
outdoor units and any other location where environmental
conditions could degrade the cable’s integrity.
• Follow all national and local codes regarding cable
routing, ratings, etc.
Fig.5 - CANbus connections
P67
Indoor Unit With
Liebert iCOM
Factory-Installed CANbus Cable
Field-Installed CANbus Cable
J6
1
3
J6
1
3
J6
1
3
J6
1
3
12345678
CAN
On
12345678
CAN
On
12345678
CAN
On
12345678
CAN
On
TB50
TB49
Liebert
EconoPhase
Circuit 1
TB50
Liebert
EconoPhase
Circuit 2
TB50
Liebert
MC Unit
Circuit 2
TB50
TB49
Liebert
EconoPhase
CANbus Terminal Block
TB49
TB49
TB50
TB49
Liebert
MC Unit
Circuit 1
Connect wire 3 to PIN1and wire 4 to PIN3
To Next Page
Loading...