Vertiv Liebert User manual

LIEBERT® OUTDOOR
CONTROL ENCLOSURE™
Quick Installation Guide
590-1734-501A/SL-10060_REV5_9-17 1
The Liebert Outdoor Control
Enclosure is a NEMA 3R rated
enclosure that mounts on Liebert
condensers or drycoolers and
provides control for one or more
pumps and/or fan motors.
INSTALLING
THEENCLOSURE
WARNING: Arc flash and
electric shock hazard. Open all
local and remote electric power-
supply disconnect switches, verify
with a voltmeter that power is off
and wear appropriate OSHA-
approved personal protective
equipment per NFPA 70E before
working within the electric control
enclosure.
Installer must provide a remote,
electric-power disconnect switch
and earth ground to unit per NEC,
CEC and local codes as applicable.
Failure to comply can cause injury
or death.
NOTICE: Risk of water leaks. Can
cause equipment damage.
NOTE: To flush-mount the back of
the enclosure, the adjustable
brackets can be inverted. Refer to
the “Dimensions” drawings on the
following page.
NOTE: Alternate mounting
locations are on a secure wall or
building surface.
Use the provided mounting
brackets to attach the enclosure to
a Liebert condenser or drycooler.
• Tighten the bracket fasteners
to maintain the weather rating
of the enclosure.
• Ensure that the field wiring
knockouts are facing down, and
the enclosure cover is vertical.
• Ensure that the bolts securing
the enclosure cover are in place
and tightened securely when
the installation is complete.
Outward-facing
Bracket
Orientation
Inward-facing
Bracket
Orientation

LIEBERT® OUTDOOR CONTROL ENCLOSURE™
Quick Installation Guide
2 590-1734-501A/SL-10060_REV5_9-17
7-9/16”
(192mm)
ELECTRICAL CONNECTIONS
WARNING: Arc flash and
electric shock hazard. Open all
local and remote electric power-
supply disconnect switches, verify
with a voltmeter that power is off
and wear appropriate OSHA-
approved personal protective
equipment per NFPA 70E before
working within the electric control
enclosure. Installer must provide a
remote, electric-power disconnect
switch and earth ground to unit per
NEC, CEC and local codes as
applicable. Failure to comply can
cause injury or death.
Hazardous-voltage
Power-supplyWiring
Wire per NEC and local codes.
Hazardous-voltage electrical
service is required at the location
of the control enclosure. Use the
knockouts provided at the bottom
of the enclosure. This power
supply does not have to be the
same voltage as the Liebert indoor
unit. This separate power source
may be 110V, 208V, 230V, 460V or
575V, single-phase or three-phase,
60Hz; or it may be 200V, 230V,
380V or 415V, single-phase or
three-phase, 50Hz as appropriate.
Extra-low-voltage Control
Wiring
Control interlock between the
control enclosure and the indoor
unit(s) or other source(s) is
required. Multiple indoor units may
be connected in parallel if the
controlled pumps will feed them all.
• Extra-low voltage, non-safety
control wiring must be a
minimum of 16GA. (1.665mm2)
for up to 75ft (22.9m), or not
to exceed 1-V drop in the
control line.
3-11/16”
(94mm)
20-5/16”
(516mm)
36”
(914mm)
16-13/16”
(427mm) 2-13/16”
(71mm)
37-9/16”
(954mm)
3-11/16”
(94mm)
20-5/16”
(516mm)
21”
(533mm)
16-13/16”
(427mm) 2-13/16”
(71mm)
22-9/16”
(573mm)
7-9/16”
(192mm)
BOTTOM
VIEW
BOTTOM
VIEW
7/8”
1-1/8ӯ
1-3/8ӯ
1-3/4ӯ 7/8ӯ 7/8ӯ
7/8ӯ
1-1/8ӯ
1-3/8ӯ 1-1/8ӯ
7/8ӯ
1-1/8ӯ
1-3/8ӯ
1-3/4ӯ 7/8ӯ 7/8ӯ
7/8ӯ
1-1/8ӯ
1-3/8ӯ 1-1/8ӯ
Dimensions and Knockouts for 36-in. Models
Dimensions and Knockouts for 21-in. Models

LIEBERT® OUTDOOR CONTROL ENCLOSURE™
Quick Installation Guide
3 590-1734-501A/SL-10060_REV5_9-17
• Install extra-low-voltage control
wiring (24V) from Terminals
70and71 on the wire raceway
in the compressor
compartment of the indoor unit
to Terminals 70and71 of the
control enclosure.
• Install extra-low-voltage control
wiring between Terminals
24and50 from the control
enclosure to the indoor cooling
unit’s common alarm or other
alarm location for loss-of-flow
indication.
• Install extra-low-voltage control
wiring between the auxiliary
terminals on the control panel
to Terminals 70and71 on the
drycooler.
• Connect the flow switch wiring
to Terminals 77and74.
• Provide line voltage to power
block(s) in the control
enclosure as shown in the
electrical schematic.
• Install optional field-supplied
disconnect if desired.
• Run 3-phase line voltage from
the control box to each
individual pump motor.
FLOW SWITCH
INSTALLATION
NOTE: Only required for dual-
pump package installation.
• Mount the flow switch in a
section of coolant supply/
return piping where there is a
straight run of at least five(5)
pipe diameters on each side of
the flow switch.
• Mount the switch so the
terminals or wire leads are
easily accessible for wiring.
• Mount the flow switch in a
standard 1-in.x1-in.x1-in. tee
for one-inch pipe installation.
Use a reducing tee for larger
sizes of pipe to keep the flow
switch near the pipe and to
provide adequate paddle
length in the flow stream.
• Screw the flow switch in
position so the flat part of the
paddle is at a right angle to the
flow. The arrow on the side of
the case must point in the
direction of the flow.
• The flow switch must be
mounted in a horizontal
pipeline.
DUAL PUMP CONTROLS
SEQUENCE OF OPERATION
On a call for cooling, the
compressor contactor and/or the
Econ-O-Coil relay in the Liebert
unit is energized. The relay and
contactor are in the Liebert indoor
evaporator section. Each
compressor contactor has a side
switch wired in parallel with the
Econ-O-Coil relay and is
responsible for closure of the
low-voltage pump-control circuit.
This low-voltage circuit has a series
of contactors, relays, selector
switch and a flow switch. This
circuit controls the start of the
pumps and provides contact
closure to interlock the
drycooler(s) control circuit. Once
the circuit is closed, 24V is passed
to the pumps control circuit and
the auxiliary relays are energized,
closing the drycooler(s) control
circuit.
Pump P1 is factory set to be the
primary pump (Selector Switch 1-2).
Voltage then passes through the
normally closed contacts of the R2
relay (standby pump relay), through
the current overloads and to the #1
pump contactor. At this point, the
#1 pump and appropriate
drycoolers are running.
When the pump establishes flow, it
opens the system flow switch. The
pump has approximately
10seconds to establish full flow. If it
does, the system will run in this
state until the call for cooling is
satisfied and the circuit drops out.
If this pump cannot establish flow
or if it has been running and fails,
the flow switch will close and
energize an adjustable relay,
typically set for 10 seconds.
Once this relay times out, it
energizes the R2 switch over relay.
This relay will drop out the voltage
to the #1 pump contactor and
energize the #2 pump contactor.
Along with the R2 relay the AL
relay (alarm relay) will energize.
This will provide a set of closed
contacts for remote indication of
the switch-over situation.
Once the problem with the lead
pump is repaired, the controls must
be reset. To reset the control box,
turn O the main power to the
control box and then restore the
main power to the control box.
Pump P1 then becomes the
primary pump again.

To contact Vertiv Technical Support: visit www.VertivCo.com
© 2017 Vertiv Co. All rights reserved. Vertiv and the Vertiv logo are trademarks or registered trademarks of Vertiv Co. All other names and logos referred to are trade names,
trademarks or registered trademarks of their respective owners. While every precaution has been taken to ensure accuracy and completeness herein, Vertiv Co. assumes no
responsibility, and disclaims all liability, for damages resulting from use of this information or for any errors or omissions. Specifications are subject to change without notice.
LIEBERT® OUTDOOR CONTROL ENCLOSURE™
Quick Installation Guide
4 1734-501A/SL-10060_REV5_9-17
TECHNICAL SUPPORT
ANDSERVICE
Vertiv Services, Inc.
24x7 dispatch of technicians for all
products.
1-800-543-2378
Liebert Thermal
ManagementProducts
1-800-543-2778
Liebert Channel Products
1-800-222-5877
Liebert AC andDC
PowerProducts
1-800-543-2378
LOCATIONS
United States
Vertiv Headquarters
1050 Dearborn Drive
Columbus, OH, 43085, USA
Europe
Via Leonardo Da Vinci 8 Zona
Industriale Tognana
35028 Piove Di Sacco (PD) Italy
[phone]
Fax: [phone]
Asia
7/F, Dah Sing Financial Centre
3108 Gloucester Road, Wanchai
Hong Kong 852 2572220
Fax: [phone]