Emerson 3000 Manuel D’Utilisation
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
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
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
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
34
37
38B
37B
38C
37C
97
96
95
94
76
75
56
55
51
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
13
13
Terminal Block
(for Customer Connectons
Electrical Handy Box *
(Factory-Installed With Cover)
DPN000354
Rev. 2
Rev. 2