Unit installation

Electrical Field Connections Descriptions

APPENDIX E-ELECTRICAL FIELD CONNECTIONS DESCRIPTIONS

E.1 STANDARD ELECTRICAL CONNECTIONS

1. High-voltage entrance through the bottom of the electric panel—1.38" (34.9mm), 1.75"

(44.5mm) and 2.50" (64mm) diameter concentric knockout.

2. Low-voltage entrance through the bottom of the electric panel—Quantity, two;

1.125" (28mm) diameter knockouts.

3. High-voltage entrance through the top of the unit—1.38" (34.9mm), 1.75" (44.5mm) and

2.50" (64mm) diameter concentric knockout.

4. Low-voltage entrance through the top of the unit—Quantity (2) 1.125" (28mm) diameter

knockouts.

5. Three-phase electrical service—Connect to terminals on disconnect switch. Three-phase

service not by Liebert.

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 and 50, 2 and 51, 5 and 55, or 3 and 56. Use

field-supplied Class 1 wiring.

10. Common alarm—On any alarm, normally open dry contact is closed across Terminals 75 and 76

for remote indication. 1 AMP, 24VAC maximum 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 and 71 to heat rejection equipment. 1 AMP, 24VAC max load. Use

Class 1 field-supplied wiring.

E.2 OPTIONAL ELECTRICAL CONNECTIONS

12. Smoke sensor alarm—Factory-wired dry contacts from smoke sensor are 91-common, 92-NO,

and 93-NC. Supervised contacts, 80 and 81, open on sensor trouble indication. This smoke sensor

is not intended to function as, or replace, any room smoke detection system that may be required

by local or national codes. 1 AMP, 24VAC max load. Use Class 1, field-supplied wiring.

13. Reheat and humidifier lockout—Remote 24VAC required at Terminals 82 and 83 for lockout

of reheat and humidifier.

14. Condensate alarm (with condensate pump option)—On pump high water indication,

normally open dry contact is closed across Terminals 88 and 89 for remote indication. 1 AMP,

24VAC maximum load. Use Class 1, field-supplied wiring.

15. Common Alarm—On any alarm, one additional normally open dry contact is closed across

Terminals 94 and 95 for remote indication. 1 AMP, 24VAC max load. Use Class 1, field-supplied

wiring.

16. Liebert Liqui-tect

™

shutdown and dry contact—On Liebert Liqui-tect activation, normally

open dry contact is closed across Terminals 58 and 59 for remote indication (Liebert Liqui-tect

sensor ordered separately). 1 AMP, 24VAC max load. Use Class 1, field-supplied wiring.

NOTE

Refer to specification sheet for total unit full load amps, wire size amps, and maximum

overcurrent protective device size.