REV : 8
REV DATE : 12/16
DPN001884
Page :1 /3
Form No.: DPN001040_REV4
ELECTRICAL FIELD CONNECTIONS DESCRIPTIONS
LIEBERT CRV
600mm (24in.) MODELS
STANDARD ELECTRICAL CONNECTIONS
1) High voltage connection through the bottom of the electric panel – 1-3/8” (34.9mm), 1-3/4” (44.5mm) & 2-
diameter concentric knockout.
2) Low voltage connection through the bottom of the electric panel - Quantity (2) 7/8” (22mm) diameter knockouts.
3) High voltage connection through the top of the unit – 1-3/8” (34.9mm), 1-3/4” (44.5mm) & 2-
1/2” (64mm) diameter concentric
knockout.
4) Low voltage connection through the top of the unit - Quantity (4) 7/8” (22mm) diameter knockouts.
5) Three phase electrical service – Connect to t
erminals on disconnect switch. Three phase service not by Liebert. (see page 2 for
an important note regarding unit electrical service)
6) Factory Installed locking Disconnect Switch
7) Earth ground - Terminal for field supplied earth grounding wire.
8) 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.
9) Customer alarm inputs -
Terminals for field supplied, normally closed contacts, having a minimum 75VA, 24VAC rating, between
terminals 3 & 50, 2 & 51, 5 & 55, or 3 & 56. Use field supplied Class 1 wiring. Terminal 3 & 56 are used for humidifier alarm
humidifier i
s installed. The remaining terminals are available for customer alarm inputs, such as; smoke sensors and building fire
alarms.
10) 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.
11) Heat rejection interlock -
On any call for compressor operation, normally open dry contact is closed across terminals 70 & 71 to
heat rejection equipment. 1 AMP, 24VAC max load. Use Class 1 field supplied wiring.
STANDARD 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.
13) CANbus Cable – CANbus cable provided by others to connect to the outdoor condenser. 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 the 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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