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Installation (Applicable to all Models)
Liebert
®
Challenger 3000
™
20
Figure 12 Electrical connections
2.7.1 Electrical Field Connections for Liebert Challenger 3000 Models
Source: DPN00354, Rev. 2
1. Electric conduit knockouts on top and bottom of electric box. Knockout size 1-3/4" (44.5mm).
2. Three-phase connection. Electric service connection terminals when factory disconnect is NOT
supplied.
3. Three-phase connection. Electric service connection terminals when factory disconnect switch
is supplied.
4. Factory-installed disconnect switch. (Optional).
5. Three-phase electric service field-supplied.
6. Earth ground connection (50/60Hz). Connection terminal for field-supplied earth grounding
wire.
7. Earth ground bar (50Hz only). Connection terminals with factory ground from each high
voltage component for field-supplied earth grounding wire.
8. Control and monitoring section of electric box.
9. Remote unit shutdown. Replace existing jumper between Terminals 37 + 38 with normally
closed switch having a minimum 75VA, 24VAC rating. Use field-supplied Class 1 wiring. Two
additional contact pairs available as an option (labeled as 37B & 38B, 37C & 38C). Replace
existing jumper for appropriate pair as done for 37 & 38.
10. Special alarm connections. Field-supplied 24V Class 1 wiring for special alarm. Connection
made by adding normally open contacts between terminals 24 + 50. Special alarm connections
may be factory-wired or field-wired. See schematic for factory-wired special alarms. For
field-wired special alarms, use 24V Class 1 wiring to connect normally open contacts between
Terminals 24 & 50, 24 & 51, 24 & 55, or 24 & 56.
11. Remote condensing unit connection. Field-supplied 24V Class 1 wiring to remote condensing
unit Terminals 1, 2, 3, & 4 from (R2) relay (split system only).
12. Smoke detector alarm connections. Field-supplied 24V Class 1 wiring to remote alarm
circuits. Factory-wired contacts from optional smoke detector are #91-comm., #92-NO, and
#93-NC.
13. Common alarm connection. Field-supplied 24V. Class 1 wiring to common alarm
Terminals 75 + 76 (and optional 94 + 95, and 96 + 97), which are factory-connected to common
alarm relay (R3).
88
89
84
85
82
83
91 92
93
12 343738B37B38C37C9796
95
94
76
75 565551
50
24
38
70
71
72
73
1
3
2
14
4
5
1
7
6
12 11 15 16 17
9
9
10
8
1313
Terminal Block
(for Customer Connectons
Electrical Handy Box *
(Factory-Installed With Cover)
DPN000354
Rev. 2