REV : 1
REV DATE : 6/18
DPN004387
Page :1 /3
50kW - 85kW UPFLOW AND DOWNFLOW MODELS
Form No.: DPN001040_REV4
ELECTRICAL FIELD CONNECTION DESCRIPTION
LIEBERT DSE
STANDARD ELECTRICAL CONNECTIONS
1) Primary high voltage entrance - 2.50” (64mm); 1.75” (44mm); 1.375” (35mm) diameter concentric knockouts located in bottom of box
2) Secondary high voltage entrance - 2.50” (64mm); 1.75” (44mm); 1.375” (35mm) diameter concentric knockouts located in top of box
3) Primary low voltage entrance - Quantity (3) 1.375” (35mm) diameter knockouts located in bottom of unit
4) Secondary low voltage entrance - Quantity (3) 1. 375” (35mm) diameter knockouts located in top of box
5) Three phase electrical service -
Terminals are on main fuse block (disregard if unit has optional disconnect switch). Three phase service
not by Liebert.
6) Earth ground - Terminal for field supplied earth grounding wire. Earth grounding required for Liebert units.
7) Remote unit shutdown - Replace existing jumper between terminals 37 & 38 with field supplied normally closed switch having a
minimum 75VA, 24VAC rating. Use field supplied Class 1 wiring.
8) Customer alarm inputs - Terminals for field supplied, normally open contacts, having a minimum 75VA, 24VAC rating, between
terminals 24 & 50, 51, 55, 56. Use field supplied Class 1 wiring. Terminal availability varies by unit options.
9) Common alarm - On any alarm, normally open dry contact is closed across terminals 75 & 76 for remote indication. 1 AMP, 24VAC max
load. Use Class 1 field supplied wiring.
10) Heat rejection interlock - On any call for compressor operation, normally open dry contact is closed across terminals 70 & 71(circuit 1),
230 (circuit 2) to heat rejection equipment. 1 AMP, 24VAC max load. Use Class 1 field supplied wiring. Liebert DSE units must be
connected to Liebert MC series condenser with premium control. It is required that the jumper between terminal 71 and terminal 230 be
removed. Three wires must connect terminals 70, 71, and 230 of the indoor unit to terminals 70, 71 and 230 of the Liebert MC series
condenser.
11) Unit factory installed disconnect switch, Fuse Block and Main Fuses – “Locking Type” consists of a non-automatic molded case
switch operational from the outside of the unit. Access to the high voltage electric panel compartment can be obtained only with
in the “off” position. Units with fused disconnects are provided with a defeater button that allows access to the electrical panel when power
is on. The molded case switch disconnect models contain separate main fuses
CANBUS ELECTRICAL CONNECTIONS
12) CANbus Connector– Terminal block with terminals 49-1 (CAN-H) and 49-3 (CAN-L) + SH (shield connection). The terminals are used to
connect the CANbus communication cable (provided by others) from the indoor unit to the Liebert MC Condenser –Optional Econophase
Unit.
13) CANbus Cable – CANbus cable provided by others to connect to the outdoor condenser, and optional PRE unit (DA units only). No
special considerations are required when the total external cable connection between the indoor unit and outdoor unit(s) is less than
450FT (137M). For total external cable connections greater than 450FT (137M) but less than 800FT (243M) a CANbus isolator is required
(Contact Factory).
Cable must have the following specifications:
Braided shield or foil shield with drain wire
- Shield must be wired to ground at indoor unit
- 22-18AWG stranded tinned copper
- Twisted pair (minimum 4 twists per foot)
- Low Capacitance (15pF/FT or less)
- Must be rated to meet local codes and conditions
- EXAMPLES BELDEN 89207 (PLENUM RATED), OR ALPHA WIRE 6454 CATEGORY 5, 5E, OR HIGHER
14) Do not run in same conduit, raceway, or chase as high voltage wiring.
15) For CANbus network lengths greater than 450FT (137M) call Factory.
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