Electrical Field Connections
Liebert
®
CW
™
System Design Manual 72
6.1.2 Optional Electrical Connections
for Downflow Models CW146 and CW181
Refer to Figure 6-5. Source: DPN001699, Rev. 4.
8. Unit factory installed disconnect switch, Fuse Block and Main Fuses—Two types of disconnect
switches are available – “Non-Locking” and “Locking”. The “Non-Locking Type” consists of a non-
automatic molded case switch operational from the outside of the unit.
9. Access to the high voltage electric panel compartment can be obtained with the switch in either the On
or Off position. The “Locking Type” is identical, except access to the high voltage electric panel
compartment can be obtained only with the switch in the Off position.
10. The molded case switch disconnect models contain separate main fuses. Units with fused disconnect
have main fuses within the disconnect.
11. Secondary disconnect switch and earth ground—Fuses are included in the 65KAIC SCCR fused
disconnect switch models.
12. Three-phase electrical service—Terminals are on top of disconnect switch. Three-phase service not
by Emerson.
13. 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. 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. 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. 1A, 24VAC maximum load. Use
field-supplied Class 1wiring.
16. Remote humidifier—On any call for humidification, normally open dry contact is closed across
terminals 11 & 12 to signal field supplied remote humidifier. 1A, 24VAC maximum load. Use
field-supplied Class 1 wiring.
17. Reversing Starter Power Supply Notification—Normally open contact Terminals 106 and 107 will
close when Power Supply 1 is engaged; 110 and 111 will close when Power Supply 2 is engaged.
6.1.3 Optional Low-Voltage Terminal Package Connections
Refer to Figure 6-5. Source: DPN001699, Rev. 4.
18. Remote unit shutdown—Two additional contact pairs available for unit shutdown (labeled as 37B and
38B, 37C and 38C). Replace jumpers with field-supplied, normally closed switch having a minimum
75VA, 24VAC rating. Use field-supplied Class 1 wiring.
19. Common alarm—On any alarm, two additional normally open dry contacts are closed across
Terminals 94 and 95 and 96 and 97 for remote indication. 1A, 24VAC maximum load. Use
field-supplied, Class 1 wiring.
20. Main fan auxiliary switch—On closure of main fan contactor, normally open dry contact is closed
across Terminals 84 and 85 for remote indication. 1A, 24VAC maximum load. Use field-supplied Class
1 wiring.
21. Liebert Liqui-tect
®
shutdown and dry contact—On Liebert Liqui-tect activation, normally open dry
contact is closed across terminals 58 & 59 for remote indication (Liqui-tect sensor ordered separately).
1A, 24VAC maximum load. Use field-supplied Class 1 wiring.
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