Liebert 50 & 60Hz User Manual
Site Preparation and Installation
18
Figure 11 Evaporator unit electrical connections
Field supplied, field wired thermostat wire to remote wall box.
Entrance for customer low voltage connections
Field supplied 24V (NEC Class2 wiring) to condensing unit. (if applicable)
Entrance for customer low
voltage connections.
voltage connections.
Electrical entrance for
optional condensate
pump on left side of unit.
optional condensate
pump on left side of unit.
Entrance for customer high
volt connections.
volt connections.
Electric service
not by Liebert
not by Liebert
Field supplied unit disconnect switch
when factory unit disconnect switch
is not supplied.
when factory unit disconnect switch
is not supplied.
High Volt Power Connections
Electric service connection terminals.
Electric service connection terminals.
Optional factory installed
disconnect switch.
disconnect switch.
Earth Ground Connection
Connection terminal for field
supplied earth grounding wire.
Connection terminal for field
supplied earth grounding wire.
Optional Remote Sensor
Connection P16-1,2,3,4.
Connection P16-1,2,3,4.
Optional Single
Point Power Kit
1
2
3
4
5
6
7
8
9
10
37
60
61
70
71
75
76
77
78
84
85
24
50
51
56
Heat Rejection Connection. Field supplied
24V NEC Class 2 wiring TB1-10. See note 2.
24V NEC Class 2 wiring TB1-10. See note 2.
Remote Unit Shutdown. Use field supplied
24V Class 2 wire. Replace existing jumper
between TB37 & TB38 with NC switch
having a minimum 75 VA rating.
24V Class 2 wire. Replace existing jumper
between TB37 & TB38 with NC switch
having a minimum 75 VA rating.
Optional Condensate Pump
Auxiliary Float Switch Shut
Down Connection
TB60-61.
Auxiliary Float Switch Shut
Down Connection
TB60-61.
Drycooler/Circulating Pump Control
Circuit TB70-71. Optional
W/Glycool/Econ-O-Cycle models.
Use field supplied 24V class 2 wire.
Circuit TB70-71. Optional
W/Glycool/Econ-O-Cycle models.
Use field supplied 24V class 2 wire.
Common Alarm Connection.
Use field supplied 24V
Class 2 wire. TB75-76.
Use field supplied 24V
Class 2 wire. TB75-76.
Site Monitoring Connection.
Terminals TB78 (+) TB77 (-) are for
connection of a 2 wire, twisted pair,
communication cable to optional
sitescan.
Terminals TB78 (+) TB77 (-) are for
connection of a 2 wire, twisted pair,
communication cable to optional
sitescan.
Optional Main Fan Auxilary
Side Switch TB84-85.
Field supplied 24V Class 2
wire.
Side Switch TB84-85.
Field supplied 24V Class 2
wire.
Customer Remote Alarm
Connection TB50,51,56,24.
Field supplied 24V Class 2
wiring.
Connection TB50,51,56,24.
Field supplied 24V Class 2
wiring.
FRONT OF UNIT
Microprocessor
Board
38
Remote Control Panel Connection to
TB3-1,2,3,4 connected with field supplied
Thermostat wire (22ga, shielded/jacketed:
available from Liebert or others).
TB3-1,2,3,4 connected with field supplied
Thermostat wire (22ga, shielded/jacketed:
available from Liebert or others).
Remote Humidifier Contact
Field Supplied 24V class 2
wiring to terminals 11 & 12,
located in field wire
compartment.
Field Supplied 24V class 2
wiring to terminals 11 & 12,
located in field wire
compartment.
11
12
NOTES:
1. Refer to specification sheet for
full load amp. and wire size amp.
ratings.
2. Control voltage wiring must be a
minimum of 16 GA (1.6mm) for up
to 75’ (23m) or not to exceed 1 volt
drop in control line.
1. Refer to specification sheet for
full load amp. and wire size amp.
ratings.
2. Control voltage wiring must be a
minimum of 16 GA (1.6mm) for up
to 75’ (23m) or not to exceed 1 volt
drop in control line.
DPN000244_Rev0