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Electrical Field Connections Descriptions
Liebert
®
CRV
™
124
APPENDIX C-ELECTRICAL FIELD CONNECTIONS DESCRIPTIONS
C.1 STANDARD ELECTRICAL CONNECTIONS
(Source: DPN001884, Rev. 4, Page 1)
1. High Voltage Connection Through the Bottom of the Electric Panel—1-3/8" (34.9mm),
1-3/4" (44.5mm) 2-1/2" (64mm) 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)
and 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 terminals on disconnect switch. Three-phase
service not by Liebert (see NOTICE on page 125).
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 and 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 and 50, 2 and 51, 5 and 55 or between 3 and
56. Use Class 1, field-supplied wiring. Terminals 3 and 56 are used for humidifier alarm when a
humidifier is 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 and 76
for remote indication. 1A, 24VAC maximum load. Use field-supplied Class 1 wiring.
11. Heat Rejection Interlock—On any call for compressor operation, normally open dry contact is
closed across Terminals 70 and 71 to heat rejection equipment. 1A, 24VAC maximum load. Use
field-supplied Class 1 wiring.
C.2 ELECTRICAL CONNECTIONS FOR OPTIONAL FEATURES
12. Condensate Pump High Water Alarm (available when optional pump is installed)—On
pump high water indication, normally open dry contact is closed across Terminals 88 and 89 for
remote indication. 1A, 24VAC maximum load. Use field-supplied Class 1 wiring.
13. Liebert Liqui-tect
®
Shutdown and Dry Contact (Available When Optional Liebert
Liqui-tect Sensor is Installed)—On Liebert Liqui-tect activation, normally open dry contact is
closed across Terminals 58 and 59 for remote indication. The Liebert Liqui-tect sensor notifies
Liebert iCOM of indication through Terminals 60 and 61. 1A, 24VAC maximum load. Use
field-supplied Class 1 wiring.
14. Reheat and humidifier lockout—Remote 24VAC required at Terminals 82 and 83 for lockout
of reheat and humidifier.
15. Additional Common Alarm—On any alarm, one additional normally open dry contact is closed
across Terminals 94 and 95 for remote indication. 1A, 24VAC maximum load. Use field-supplied
Class 1 wiring.
NOTE
Refer to specification sheet for total unit full load amps, wire size amps and maximum
overcurrent protective device size.