Vertiv Liebert DSE - Page 130

REV : 1
REV DATE : 6/18
DPN004388
Page :1 /4
DA125, DA150 & DA165 DOWNFLOW MODELS
Form No.: DPN001040_REV4
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) Primary low voltage entrance - Quantity (3) 1.375” (35mm) diameter knockouts located in bottom of unit.
3) Three phase electrical service - Terminals are on top of disconnect switch. Three phase service not by Liebert.
4) Earth ground - Terminal for field supplied earth grounding wire and component ground terminal strip. Earth grounding
required for Liebert units.
5) 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.
6) 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.
7) 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.
8) 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.
9) Unit factor 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 electrical panel compartment can be obtained only
with the switch 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
10) 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.
11) CANbus Cable – CANbus cable provided by others to connect to the outdoor condenser and optional PRE unit. 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 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
12) Do not run in same conduit, raceway, or chase as high voltage wiring.
13) For CANbus network lengths greater than 450FT (137M) call Factory.
ELECTRICAL FIELD CONNECTION DESCRIPTIONS