Emerson Liebert DS Series User Manual

Electrical Connections
78
Table 47 Electrical field connection descriptions
STANDARD ELECTRICAL CONNECTIONS
1. Primary high voltage entrance - 2.50"
(64mm); 1.75" (44mm); 1.375" (35mm)
diameter concentric knockouts in bottom of box.
2. Secondary high voltage entrance - 2.50"
(64mm); 1.75" (44mm); 1.375" (35mm)
diameter concentric knockouts in top of box.
3. Primary low voltage entrance - Quantity (3)
1.125" (28mm) diameter knockouts in bottom of
unit.
4. Secondary low voltage entrance - Quantity
(3) 1.125" (28mm) diameter knockouts in top of
box.
5. Three-phase electrical service - Terminals
are on high voltage terminal block (disregard if
unit has optional disconnect switch).
Three-phase service not by Emerson.
6. Earth ground - Terminal for field-supplied earth
grounding wire. Earth grounding required for all
units.
7. Remote unit shutdown - Replace existing
jumper between Terminals 37 & 38 with field-
supplied normally closed switch having a
minimum 75VA, 24VAC rating. Use
field-supplied Class 1 wiring.
8. Customer alarm inputs - Terminals for
field-supplied, normally open contacts, having a
minimum 75VA, 24VAC rating, between
Terminals 24 & 50, 51, 55, 56. Use
field-supplied Class 1 wiring. Terminal
availability varies by unit options.
9. Liebert SiteScan - Terminals 77(-) & 78(+) for
a 2-wire, twisted-pair, communication cable
(available from Emerson) to optional Liebert
SiteScan. The communication cable must be
shielded on units with VFD or EC fans.
10.Common alarm - On any alarm, normally open
dry contact is closed across Terminals 75 & 76
for remote indication. 1A, 24VAC max load. Use
field-supplied Class 1 wiring.
11. Heat rejection interlock - On any call for
compressor operation, normally open dry
contact is closed across Terminals 70 & 71 to
heat rejection equipment. 1A, 24VAC max load.
Use field-supplied Class 1 wiring.
OPTIONAL ELECTRICAL CONNECTIONS
12.Factory-installed disconnect switch.
13.Secondary disconnect switch and earth ground.
14.Three-phase electrical service - Terminals are on top of disconnect
switch. Three-phase service not by Emerson.
15.Smoke sensor alarm - Factory-wired dry contacts from smoke
sensor are 91-common, 92-NO, and 93-NC. Supervised contacts, 80
& 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
max load. Use field-supplied Class 1 wiring.
16.Reheat and humidifier lockout - Remote 24VAC required at
Terminals 82 & 83 for lockout of reheat and humidifier.
17.Condensate alarm (with condensate pump option) - On pump
high water indication, normally open dry contact is closed across
Terminals 88 & 89 for remote indication. 1A, 24VAC max load. Use
field-supplied Class 1 wiring.
18.Analog inputs - Terminals for up to two customer-supplied analog
inputs. Device 1 wires to 41(-) and 42(+). Device 2 wires to 43(-) and
44(+).
19.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 max load. Use field-supplied Class 1
wiring.
20.Auxiliary cool contact - On any call for Econ-O-Coil operation,
normally open dry contact is closed across Terminals 72 & 73 on
Dual-Cool units only. 1A, 24VAC max load. Use field-supplied
Class 1 wiring.
OPTIONAL LOW VOLTAGE TERMINAL PACKAGE CONNECTIONS
21.Remote unit shutdown - Two additional contact pairs available for
unit shutdown (labeled as 37B & 38B, 37C & 38C). Replace jumpers
with field-supplied normally closed switch having a minimum 75VA,
24VAC rating. Use field-supplied Class 1 wiring.
22.Common alarm - On any alarm, two additional normally open dry
contacts are closed across Terminals 94 & 95 and 96 & 97 for remote
indication. 1A, 24VAC max load. Use Class 1 field-supplied wiring.
23.Main fan auxiliary switch - On closure of main fan contactor,
normally open dry contact is closed across Terminals 84 & 85 for
remote indication. 1A, 24VAC max load. Use field-supplied Class 1
wiring.
24.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 (Liebert Liqui-tect sensor
ordered separately). 1AMP, 24VAC max load. Use field-supplied
Class 1 wiring.
DPN000807
Rev. 2
Refer to specification sheet for total unit full load amps, wire size amps and maximum overcurrent protective device size.

Emerson Liebert DS Series Specifications

General

Brand	Emerson
Model	Liebert DS Series
Category	Heat Pump
Language	English