Vertiv XTE 601E Series Operating and installation instructions

XTE 601E Series
Equipment Enclosures
Description and Installation Manual
Specification Number: F2019015, F2019016

Vertiv™ XTE 601E Series Equipment Enclosures Description and Installation Manual
Vertiv™ XTE 601E Series Equipment Enclosures Description and Installation Manual
The information contained in this document is subject to change without
notice and may not be suitable for all applications. While every precaution has
been taken to ensure the accuracy and completeness of this document, Vertiv
assumes no responsibility and disclaims all liability for damages resulting from
use of this information or for any errors or omissions. Refer to other local
practices or building codes as applicable for the correct methods, tools, and
materials to be used in performing procedures not specifically described in
this document.
The products covered by this instruction manual are manufactured and/or
sold by Vertiv. This document is the property of Vertiv and contains
confidential and proprietary information owned by Vertiv. Any copying, use or
disclosure of it without the written permission of Vertiv is strictly prohibited.
Names of companies and products are trademarks or registered trademarks of
the respective companies. Any questions regarding usage of trademark
names should be directed to the original manufacturer.
Technical Support Site
If you encounter any installation or operational issues with your product, check the pertinent section of this
manual to see if the issue can be resolved by following outlined procedures.
Visit https://www.vertiv.com/en-us/support/ for additional assistance.

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TABLE OF CONTENTS
Admonishments Used in this Document......................................................................................................................... vi
Important Safety Instructions ........................................................................................................................................... vii
1 Purpose of this Document............................................................................................................................................... 1
2 Product Description .......................................................................................................................................................... 1
2.1 General.....................................................................................................................................................................................................................................................................................1
2.2 Part Numbers....................................................................................................................................................................................................................................................................2
2.3 Application ..........................................................................................................................................................................................................................................................................2
2.4 Configured Equipment.............................................................................................................................................................................................................................................2
2.5 Standards Compliance.............................................................................................................................................................................................................................................2
2.6 Safety Listed AC Components.........................................................................................................................................................................................................................3
2.7 Commercial AC Service...........................................................................................................................................................................................................................................3
2.8 Enclosure Dimensions, Weights, and Physical Specifications.............................................................................................................................................3
2.8.1 Typical Pad-Mount Overhead View......................................................................................................................................................................................4
2.9 Enclosure Features and Options..................................................................................................................................................................................................................11
3 Sequence of Procedures................................................................................................................................................17
3.1 General..................................................................................................................................................................................................................................................................................17
4 Front Door, Locks, and Removable Panels...............................................................................................................18
4.1 Safety Precautions....................................................................................................................................................................................................................................................18
4.2 Front Door.........................................................................................................................................................................................................................................................................18
4.3 Opening and Closing the Enclosure Front Door...........................................................................................................................................................................18
4.3.1 Opening the Front Door................................................................................................................................................................................................................18
4.3.2 Closing the Front Door...................................................................................................................................................................................................................18
4.4 Intrusion Alarm............................................................................................................................................................................................................................................................20
4.4.1 F2019015 ....................................................................................................................................................................................................................................................20
4.4.2 F2019016 ....................................................................................................................................................................................................................................................20
4.5 Door Activated Light Switch ..........................................................................................................................................................................................................................20
4.6 Removing/Installing Rear Access Panels ............................................................................................................................................................................................22
4.7 Reversing the Hinge Side of the Enclosure’s Front Door.................................................................................................................................................... 24
5 Installation Considerations ..........................................................................................................................................24
5.1 Important Safety Instructions........................................................................................................................................................................................................................24
5.2 Installation Overview..............................................................................................................................................................................................................................................24
5.3 Tools and Test Equipment Required for Installation............................................................................................................................................................... 24
5.4 Materials Required for Installation.............................................................................................................................................................................................................26
5.5 Recommended Anchors......................................................................................................................................................................................................................................26
6 Enclosure Placement...................................................................................................................................................... 27
6.1 Overview.............................................................................................................................................................................................................................................................................27
6.2 Site Selection .................................................................................................................................................................................................................................................................27
6.3 Site Ground......................................................................................................................................................................................................................................................................28
6.4 Concrete Foundation Pad..................................................................................................................................................................................................................................29
6.5 Form Preparation ........................................................................................................................................................................................................................................................31
6.6 Transportation and Storage.............................................................................................................................................................................................................................33
6.7 Unpacking the Enclosure at the Installation Site.........................................................................................................................................................................33

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6.8 Preparing the Enclosure.....................................................................................................................................................................................................................................34
6.9 Preparing the Concrete Pad............................................................................................................................................................................................................................35
6.10 Preparing to Lift the Enclosure....................................................................................................................................................................................................................36
6.11 Lifting the Enclosure...............................................................................................................................................................................................................................................37
6.12 Placing the Enclosure............................................................................................................................................................................................................................................38
7 Sealing Primary Equipment Compartment Cable Entries ..................................................................................42
8 Grounding the Enclosure ..............................................................................................................................................42
9 AC Power ...........................................................................................................................................................................44
9.1 Safety Precautions...................................................................................................................................................................................................................................................44
9.2 Enclosure Schematic.............................................................................................................................................................................................................................................44
9.3 AC Input Connections ..........................................................................................................................................................................................................................................45
10 DC Power ...........................................................................................................................................................................48
10.1 Safety Precautions...................................................................................................................................................................................................................................................48
10.2 General................................................................................................................................................................................................................................................................................48
10.3 DC Power Cabling Color Scheme ..............................................................................................................................................................................................................48
10.4 DC Power System.....................................................................................................................................................................................................................................................48
10.5 ECU Power Connectors (F2019015 only)...........................................................................................................................................................................................49
11 OSP Cables........................................................................................................................................................................50
11.1 General................................................................................................................................................................................................................................................................................50
11.2 Sealing Cable Entries.............................................................................................................................................................................................................................................50
11.3 Installing OSP Cables ............................................................................................................................................................................................................................................50
12 Alarm Wiring ......................................................................................................................................................................51
12.1 Connecting External Alarms.............................................................................................................................................................................................................................51
12.1.1 Enclosure Alarms..................................................................................................................................................................................................................................51
12.1.2 Typical Battery Alarm Wiring.....................................................................................................................................................................................................51
13 Batteries............................................................................................................................................................................. 57
13.1 Safety Precautions....................................................................................................................................................................................................................................................57
13.2 Battery Boxes................................................................................................................................................................................................................................................................58
13.2.1 Battery Boxes Heating...................................................................................................................................................................................................................58
13.2.2 Cabling..........................................................................................................................................................................................................................................................58
13.2.3 Battery Disconnect ...........................................................................................................................................................................................................................58
13.2.4 Anti-Oxidant............................................................................................................................................................................................................................................58
13.2.5 Physical Battery Placement......................................................................................................................................................................................................58
13.2.6 Physical Size of Battery Box.....................................................................................................................................................................................................58
13.3 Supported Batteries................................................................................................................................................................................................................................................58
13.4 Battery Installation and Connection........................................................................................................................................................................................................59
13.4.1 Installing and Connecting SAFT NiCd Batteries (F2019015, F2019016) ........................................................................................60
14 Initial Power Up................................................................................................................................................................66
14.1 Safety Precautions...................................................................................................................................................................................................................................................66
14.2 Prerequisite ....................................................................................................................................................................................................................................................................66
14.3 Initial Power Up Sequence ...............................................................................................................................................................................................................................66
15 Climate Control Options (F2019015).........................................................................................................................67
15.1 ECU (Environmental Control Unit) and Thermal Components......................................................................................................................................67
15.1.1 ECU Description...................................................................................................................................................................................................................................67

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15.1.2 Overview Diagrams...........................................................................................................................................................................................................................68
15.1.3 ECU Power Connector.....................................................................................................................................................................................................................71
15.2 Thermal Components and ECU Operation.........................................................................................................................................................................................71
15.2.1 Primary Equipment Compartment .......................................................................................................................................................................................71
15.2.2 Battery Boxes...........................................................................................................................................................................................................................................71
15.3 ECU User Interface....................................................................................................................................................................................................................................................71
15.3.1 Initial Start-Up Sequence..............................................................................................................................................................................................................71
15.3.2 ECU Display Codes and Alarm Relays.............................................................................................................................................................................72
15.3.3 External Alarms.....................................................................................................................................................................................................................................72
15.3.4 Red and Red/Blue LEDs................................................................................................................................................................................................................72
15.3.5 Intrusion Alarm.......................................................................................................................................................................................................................................72
15.3.6 Maintenance Mode............................................................................................................................................................................................................................74
15.3.7 Resetting the ECU..............................................................................................................................................................................................................................74
15.3.8 Optimal Cooling Locations for Rack-Mount Equipment.................................................................................................................................74
16 Climate Control Options (F2019016)......................................................................................................................... 76
16.1 Air Conditioner .............................................................................................................................................................................................................................................................76
16.2 Environmental Controls .......................................................................................................................................................................................................................................76
16.3 User Interface................................................................................................................................................................................................................................................................76
16.4 High Temperature Alarm....................................................................................................................................................................................................................................77
16.5 Optimal Cooling Locations for Rack-Mount Equipment.......................................................................................................................................................77
17 Maintenance, Troubleshooting, and Replacement Procedures........................................................................ 78
17.1 Important Safety Instructions.........................................................................................................................................................................................................................78
17.2 Contact Information.................................................................................................................................................................................................................................................78
17.3 Enclosure Identification........................................................................................................................................................................................................................................78
17.4 Routine Maintenance.............................................................................................................................................................................................................................................78
17.4.1 DC Power System Maintenance............................................................................................................................................................................................78
17.4.2 Heat Exchanger Maintenance.................................................................................................................................................................................................78
17.4.3 Battery Maintenance........................................................................................................................................................................................................................78
17.4.4 Battery Replacement .......................................................................................................................................................................................................................79
17.4.5 Freezing Rain and Ice......................................................................................................................................................................................................................79
17.5 Troubleshooting.........................................................................................................................................................................................................................................................80
17.5.1 DC Power System...............................................................................................................................................................................................................................80
17.5.2 Batteries......................................................................................................................................................................................................................................................80
17.5.3 Environmental Control Unit (ECU) ....................................................................................................................................................................................80
17.6 Replacement Procedures...................................................................................................................................................................................................................................82
17.6.1 LED Light Replacement................................................................................................................................................................................................................82
17.6.2 Heat Exchanger Internal and External Fan Replacement.............................................................................................................................83
17.7 Configured Equipment.........................................................................................................................................................................................................................................88
18 Accessories and Replacement Parts ........................................................................................................................89

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Admonishments Used in this Document
DANGER
! Warns of a hazard the reader will be exposed to that will likely result
in death or serious injury if not avoided
. (ANSI, OSHA)
WARNING
! Warns of a potential hazard the reader may be exposed to that could
result in
death or serious injury if not avoided
. This admonition is not used for situations that pose
a
risk only to equipment, software, data, or service. (ANSI)
CAUTION
! Warns of a potential hazard the reader may be exposed to that could
result in minor or moderate injury if not avoided
. (ANSI, OSHA) This admonition is not
used for situations that po
se a risk only to equipment, data, or service, even if such use
appears to be permitted in some of the applicable standards
. (OSHA)
ALERT
! Alerts the reader to an action that must be avoided in order to protect
equipment, software, data, or service
. (ISO)
ALERT
! Alerts the reader to an action that must be performed in order to prevent
equipment damage, software corruption, data loss, or service interruption
. (ISO)
FIRE SAFETY
! Informs the reader of fire safety information, reminders, precautions,
or policies, or of the locations of fire
-fighting and fire-safety equipment. (ISO)
SAFETY
! Informs the reader of general safety information, reminders, precautions, or
policies not
related to a particular source of hazard or to fire safety. (ISO, ANSI, OSHA)

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Important Safety Instructions
Safety Admonishments Definitions
Definitions of the safety admonishments used in this document are listed under “Admonishments Used in this Document” on page vi.
Safety and Regulatory Statements
Refer to Section 4154 (provided with your customer documentation) for Safety and Regulatory Statements.
Déclarations de Sécurité et de Réglementation
Reportez-vous à la Section 4154 (fourni avec les documents de votre client) pour les déclarations de sécurité et de réglementation.

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Vertiv™ XTE 601E Series Equipment Enclosures Description and Installation Manual
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1Purpose of this Document
This document provides description and installation instructions for the Vertiv™ XTE 601E Series 84” equipment enclosure wired for
two (2) -48V strings of Ni-Cd batteries.
Procedures related to the provisioning, start-up, and acceptance of associated telecom equipment are not covered in this document.
Documents that supplement the information in this document are referenced in “Sequence of Procedures” on page 17.
2Product Description
2.1 General
The XTE 601E Series 84” equipment enclosures are designed to house DC power, network electronics and battery backup equipment
in a single enclosure. See Figure 2.1 for overall views of the enclosure.
Figure 2.1 Overall Views of Enclosure
F2019015 F2019016

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2.2 Part Numbers
Refer to Table 2.1 for applicable product part numbers.
Table 2.1 Enclosure Part Number and Description
Part Number Description
F2019015 XTE 601E Series -48 VDC Equipment Enclosure, 84" H, 3500 W Heat Exchanger, Two (2) Battery Boxes each
support 1-battery string, NiCd Only
F2019016 XTE 601E Series -48 VDC Equipment Enclosure, 84" H, 4kW DC Air Conditioner, Two (2) Battery Boxes each
support 1-battery string, NiCd Only
2.3 Application
The XTE 601E Series 84” equipment enclosure is a full featured outdoor enclosure ideal for use in macro cell site and C-RAN
applications. The XTE 601E Series 84" equipment enclosure...
•provides a stable, secure, and water-tight environment for a -48 VDC power system, RAN equipment, outside plant
equipment, and batteries supporting wireless telecommunications applications.
•depends upon a proven structural system, integrated mechanical components, and a sealing system that withstands rain,
dust, snow, and hurricane winds.
•provides climate control solutions to keep equipment operating within its optimum temperature range.
•can be pad or platform mounted.
The enclosure has a single large 44RU-tall compartment for installation of power, equipment and batteries.
•The primary equipment compartment may house a -48 VDC power system. Additional space is available for support
equipment. The F2019015 provides a 3500 W heat exchanger to cool the compartment. The F2019016 provides a 4kW DC
air conditioner to cool the compartment.
•Two (2) "battery boxes" are provided at the bottom of the primary equipment compartment (the top battery box may be
removed in the field). Each box houses one (1) -48 VDC string of NiCd batteries.
2.4 Configured Equipment
Equipment from Vertiv and 3rd-party manufacturers may be furbished and factory-installed in the XTE 601E 84" equipment enclosure.
This may include equipment for DC power and distribution, AC power and backup (UPS), site management, RAN surge suppression,
DC voltage up conversion, fiber connectivity, etc.
Please consult Vertiv for available options and/or to have new customer-specific equipment integrated.
2.5 Standards Compliance
The XTE 601E Series 84" equipment enclosure is designed to meet the following standards:
•Telcordia, GR-487-CORE, Generic Requirements for Electronic Equipment Cabinets, Issue 5, March 2016.
•UL Listed to UL 2416 (NWIN category) under Vertiv file no. E255047, NEMA type 3R rated.

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2.6 Safety Listed AC Components
A typical XTE 601E Series 84" equipment enclosure includes the following listed or recognized components for United States:
•GFI AC Receptacle:
-Legrand Pass & Seymour 1594-I / 1595-I - UL File E42190
-Leviton 6599-I / 7599-I / 8599-I - UL File E48380
2.7 Commercial AC Service
AC power to be provided by customer via an upstream power source load center or power pedestal.
2.8 Enclosure Dimensions, Weights, and Physical Specifications
•Illustrations:
-Figure 2.2 and Figure 2.3 provide enclosure dimensional illustrations.
-Figure 2.4 provides an enclosure equipment mounting rails identification and locations illustration.
-Figure 2.5 provides an enclosure base plate dimensional illustration.
-Figure 2.6 illustrates the pad mounting rubber barrier.
-Figure 2.7 illustrates the optional re-usable pad mounting template.
-Figure 2.8 illustrates the optional pour-in-place pad mounting template.
NOTE! The rubberized barrier pad included with the enclosure or the optional re-usable pad mounting template may be
used as a template for anchor hole locations in the pad form area when an optional pour-in-place pad mounting template is
not used.
•Height: 84.07” (214 cm).
•Width: 36.02” (91 cm).
•Depth:
-F2019015: 41.24" (105 cm).
-F2019016: 43.07" (109 cm).
•Equipment and Battery Box Dimensions: Refer to Figure 2.4.
•Typical Weights:
F2019015:
-Shipping weight: 1390 lbs (630.50 kg).
-Lift weight: 1013 lbs (459.50 kg).
-On pad weight: 1013 lbs (459.50 kg); not including batteries, power system, customer equipment, and OSP cables.
F2019016:
-Shipping weight: 1390 lbs (630.50 kg).
-Lift weight: 1033 lbs (468.60 kg).
-On pad weight: 1033 lbs (468.60 kg); not including batteries, power system, customer equipment, and OSP cables.
NOTE! The enclosure is not to be lifted with batteries in place. All batteries are to be installed once the enclosure is secured
to the pad.
BATTERIES CANNOT BE LIFTED WITH THE ENCLOSURE!

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NOTE! Typical battery weights…
SAFT Tel.X+180, 180 Ah battery: 361 lbs (164kg) each -48V string.
•Color: cool-white.
•Finish: Finished in multistage dry powder polyester paint for maximum durability and performance against corrosion.
•Lifting: The enclosure has four lifting eyebolts on the top that allows it to be lifted and lowered into position.
2.8.1 Typical Pad-Mount Overhead View
Figure 2.2 and Figure 2.3 provide overhead views with the door open. These views show the enclosure clearance requirements to
freely open the door.
Figure 2.2 F2019015 Enclosure Dimensions
84.07
36.02
52.91
64.30
41.24
33.74
41.24
29.56
Notes:
1. All dimensions are in inches,
unless otherwise specified.
2. Minimum clearance of approximately
12 inches is required for airflow intake
and exhaust.

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Figure 2.3 F2019016 Enclosure Dimensions
84.06
29.56
36.02 33.74
43.07
52.83
65.32
43.07
Notes:
1. All dimensions are in inches,
unless otherwise specified.
2. Minimum clearance of approximately
12 inches is required for airflow intake
and exhaust.
120°

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Figure 2.4 Equipment Mounting Rails Identification and Locations
12 RU 23” Equipment
13 RU 19” Equipment
6 RU 19” Equipment
Note: (1) 4 RU 19” conversion bracket is
included in the enclosure and can be
used to adapt this 12 RU 23” section to 8 RU 23”.
This will primarily be used when a smaller 23”
power system is being installed in the enclosure.
(plus 2 RU 19" space
vertically oriented)

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Figure 2.5 Enclosure Base Dimensions
14.67
21.73
4.84
3.86
4.00
4.00
4.00 4.00
4.50
28.82
3.60 3.60
4.16 4.16
Front
Enclosure Bottom View
3.86
4.84
21.73
16.50
3.60
4.00
4.004.16
3.59
4.00
4.50 4.00 4.16
Front
Enclosu re Bot tom View
28.82
0.75 Dia.
(4-places)
0.75 Dia.
(4-places)
Note:
1. Dimensions are in inches.
2. Only the four (4) locations denoted “A” are
required to be used in mounting the enclosure.
F2019015
F2019016

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Figure 2.6 Pad Mounting Rubber Barrier Pad (P/N 145396)
Note:
Dimensions are in inches.
Front
Enclosure Bottom View

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Figure 2.7 Optional Re-Usable Pad Mounting Drill Template (P/N F1010584 [145344])
Note:
Dimensions are in inches.
Front
Enclosure Bottom View

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Figure 2.8 Optional Pour-in-Place Mounting Template (P/N F1010585 [554917])
Notes:
1. Dimensions are in inches.
2. “E” size hole position for mounting enclosure to pad.
(Hilti Item # 00371808 Desc: HSL - 3 - B M 12/25)

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2.9 Enclosure Features and Options
Perspective Views: Refer to Figure 2.9, Figure 2.10, and Figure 2.11 for enclosure perspective views with major features identified
Mounting Options: The enclosure is designed to be pad or platform mounted. It is to be lifted into place using the lifting eyebolts
provided on the top of the enclosure.
Exterior Finish Specifications: The enclosure is finished in multistage dry powder polyester paint (Cool White) for maximum
durability and performance against corrosion.
Front Door: The enclosure has a front environmentally sealed door that provides access to the primary equipment compartment and
battery boxes. The front door on the F2019015 includes an active heat exchanger (with fans). The front door on the F2019016
includes a DC air conditioner.
•The front door is equipped with mounting brackets for an electronic puck-lock. The puck-lock is purchased separately.
•The front door securing mechanism is a swing handle with multi-point rod-latch mechanism. The swing handle is equipped
with a padlock hasp that supports a lock with an arm diameter less than 3/8".
•The front door has an intrusion alarm switch, as well as a self-locking wind latch that secures the door open during
installation or maintenance activities. Door wind latch secures at 90° and 120°. The front door has a second intrusion switch
which activates the DC light upon door entry.
•Front door and rear access panels have EPDM rubber environmental seals.
•Front door is field hinge side reversible.
Rear Access Panels: Three (3) access panels are located on the rear of the enclosure. Each access panel contains 1/4 turn locks
and lift off to be removed. Panels are interlocked and upper panels must be removed before removing lower panels. Top rear access
panel cannot be removed until levers inside the primary equipment compartment are automatically disengaged by opening the front
door.
Equipment Frame: Constructed of 7 gauge steel (0.187”), welded and painted.
•Different configurations of 19"/23" equipment mounting rails can be configured within the equipment frame. The mounting
rails are adjustable front-to-back.
•Single -48V string battery boxes can also be added into the bottom of the equipment frame.
•Equipment frame is electrically-bonded to enclosure shell through mechanical means.
•Refer to Figure 2.4 for an illustration showing the provided 19” and 23” equipment mounting racks.
Primary Equipment Compartment: The primary equipment compartment may house:
•Customer equipment.
•A DC power system and DC distribution.
•Up to two (2) battery boxes.
•F2019015: The Environmental Control Unit (ECU) managing cooling/heating and F2019016: Hi-Temperature Alarm T-Stat.
•A principal ground bar.
•A 120 VAC, 15 A convenience outlet.
•Cable entry for customer cables.

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•Door-activated convenience light.
•Intrusion and light switches.
•Alarm block.
Grounding: The 10-position enclosure principal ground bar (alias Master Ground Bar [MGB]) is located at the rear of the primary
equipment compartment.
•The MGB ground bar is mounted on isolators.
•The default ground lug geometry is two hole with 1/4” post and 5/8” spacing.
AC Power: See “Commercial AC Service” on page 3.
Convenience Outlet: A GFCI (Ground Fault Circuit Interrupter) protected convenience outlet is provided within the primary
equipment compartment.
DC Power: The enclosure may include an integrated DC power system. For additional information, please refer to “DC Power” on
page 48.
Battery Box: The battery box houses one (1) -48V string of batteries. Up to two (2) battery boxes may be installed within the
equipment frame.
•An optional AC-powered battery heater kit is available.
•Each battery box contains a 250 A battery string disconnect circuit breaker for hi-rate battery discharging.
•For more information, including supported batteries and compartment size, refer to “Batteries” on page 57.
Cable Entry/Exit: Cable entry/exit can be made at the bottom rear of the enclosure (behind the lower battery box, if so equipped).
Cable entry can also be made through the floor of the enclosure, or through the sides of the enclosure, through duplicate sets of
conduit knockouts. Either entry supports up to 2" trade-size (2.5" actual) conduits. Refer also to Figure 9.1 on page 46 for AC Input
Knockout Locations and dimensions of conduits on the side of the cabinet.
Alarms: An "alarm interconnect block" is provided to connect enclosure alarms into customer alarm circuits.
Climate Control (F2019015)
Heat Exchanger (HX): The F2019015 enclosure primary equipment compartment has a front door mounted 3500 W heat
exchanger managed by an electronic Environmental Control Unit (ECU). The heat exchanger is designed with two inner loop
and two outer loop fans (each having 225 mm diameter impellers), allowing for a single fan to fail, with minimal loss of
performance. Thus, a fan failure is not a catastrophic event leading to an immediate shutdown. The heat exchanger properly
cools electronics without the mixing of outside air, thus maintaining the enclosure seal from the outside environment. The heat
exchanger requires no refrigerant, features low-energy consumption fans, and will continue to function when AC line power is lost
because they are DC powered.
Environmental Control Unit (ECU): The ECU in the F2019015 is an intelligent device monitoring internal conditions and
adjusting the HX fans accordingly to the needs. The primary equipment compartment HX utilizes thermistor controls and has
optimized control logic software via the ECU. As such, the enclosure properly cools/heats the system, and provides a quiet
enclosure for the neighborhood. The ECU also provides alarms for:
•ECU Malfunction.
•Fan Malfunction (HX).
•Thermal Sensor (Thermistor) Malfunction