Installation
2.6Electrical Connections
Three-phase electrical service is required for all models in either 208, 230, 460, or 575 V, 60 Hz; or 200, 230, or 380/415 V, 50 Hz. Electrical service shall conform to national and local electrical codes. Refer to equipment nameplate regarding wire size and circuit protection requirements. Refer to elec- trical schematic when making connections.
A manual electrical disconnect switch should be installed within 5 feet (1.6 m) of the unit in accor- dance with codes, or a factory-supplied disconnect switch may be factory mounted within the unit accessible from the exterior.
! WARNING
Use voltmeter to make sure power is turned off before making any electrical connections.
! CAUTION
Three-phase power must be connected to the unit line voltage terminals in the proper sequence so that scroll the compressor rotates in the proper direction.
Figure 8 Electrical connections
Electric HandyBox* (factory-installed with cover)
Termi nal Bloc k*
(f or cu st om er co nnect io ns )
37C 38C 37B 38B | 37 | 38 | 24 | 50 | 51 | 55 | 56 | 77 | 78 |
SL-11897Pg10 SL-11898Pg11 SL-11899Pg11 SL-11900Pg10 SL-11901Pg10
1.Electric conduit knockouts on top and bottom of electric box. Knockout size 1-3/4" (44.5 mm).
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 not by Liebert.
6.Earth ground connection (50/60 Hz). Connection terminal for field-supplied earth grounding wire.
7.Earth ground bar (50 Hz 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. Optional additional connections available with Advanced or Advanced with Graphics controls and appropriate optional accessories (connections 51, 55, and 56).
11.SiteScan connection. Terminals 77 (-) and 78 (+) are for connection of a 2 wire, twisted pair, communication cable (available from Liebert or others) to optional SiteScan.
12.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.)
