Emerson Liebert Challenger ITR User Manual

Precision Cooling For Business-Critical Continuity™

Liebert® Challenger™ ITR

Technical Data Manual - Row-Based, Floor-Mounted Nominal 23 or 33kW Systems, Air-Cooled, Water/Glycol-Cooled, GLYCOOL, Chilled Water, Split Systems, 50 & 60 Hz

PRODUCT NOMENCLATURE

NOTE

Tables i, ii and iii show nomenclature for the complete range of all available product options. Not all combinations are possible. For assistance, contact your local dealer, Liebert representative or call 1-800-543-2778.

Table i Product model information

B F 042 A — A A E I

Challenger ITR

H = 230/50/3

M = 380/415/50/3

R = ITR, Horizontal Flow

M = ITR, Horizontal Flow with Econ-O-Coil

Nominal capacity in thousand BTUH

E- = Evaporator C = 208/60/3 H = Hot Water

A-=Air-Cooled A = 460/60/3 A = Advanced

C-= Chilled Water

G-= GLYCOOL D = 230/60/3 G = Hot Gas

WG = WaterCooled/Glycolcooled

B = 575/60/3 G = Advanced

2 = 380/60/3 S = SCR

J = 200/50/3

Microprocessor

Microprocessor w/Graphics

0 = No Reheat 0 = No

E = Electric Reheat

Reheat

Humidifier

I = Infrared Humidifier

S = Steam Generating Humidifier

Table ii Split system configurations

Condensing Units

Air-Cooled

60 Hz

(50 Hz)

Evaporator

BR060E

(BR059E)

Air-Cooled Prop Fan

Condensing Unit

PFH067A_ _H3 PFH066A_ _H3

Centrifugal

Condensing Unit

MC_65A

(MC_64A)

Water/Glycol

Condensing Unit

MC_69W

(MC_68W)

Table iii Self-contained system configurations

Remote Equipment

Air-Cooled

Frequency Indoor Unit

Condenser Drycooler/Pump

60 Hz (50 Hz) BR067A (BR065A) CS@104 Air-Cooled

DSF112

60 Hz (50 Hz) BR071WG (BR070WG)

3/4 HP Pump 60 Hz 1-1/2 HP Pump 50 Hz

60 Hz (50 Hz) BM061G (BM058G)

DSO112 1-1/2 HP Pump

60 Hz (50 Hz) BR102C (BR101C)

@ F = Fan Speed Control L = Lee Temp

System Type

Glycol-Cooled or SelfContained - Water-Cooled

GLYCOOL

Self-Contained - Chilled Water

™

TABLE OF CONTENTS

PRODUCT NOMENCLATURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . INSIDE FRONT COVER

1.0 DEDICATED, PRECISE ENVIRONMENTAL CONTROL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

1.1 Temperature Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

1.2 Humidity Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

1.3 Air Volume . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

1.4 Air Filtration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

1.5 Year Round Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

1.6 Agency Listed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

2.0 PRECISION ENVIRONMENTAL CONTROL FOR INDUSTRIAL, TELECOMMUNICATIONS,

MEDICAL AND DATA PROCESSING EQUIPMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

2.1 Liebert Challenger ITR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

2.2 Multiple Configurations to Fit a Variety of Spaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

2.3 Efficiency in Economic Terms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

2.4 GLYCOOL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

3.0 LOCAL MONITORING SYSTEMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

3.1 Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

3.2 Control Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

3.3 Internal System Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

3.4 Monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

3.5 Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

3.6 Logging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

3.7 Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

3.8 Graphical Displays—Advanced Graphic Control Only . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

4.0 STANDARD FEATURES—ALL SYSTEMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

4.1 Cabinet and Frame. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

4.2 Electrical Panel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

4.3 Fan Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

4.4 Infrared Humidifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

4.5 Electric Reheat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

4.6 Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

4.6.1 Condensate Pump. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

4.6.2 Remote Temperature/ Humidity Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

4.6.3 Disconnect Switch—Locking Type. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

5.0 CHILLED WATER SYSTEM—STANDARD AND OPTIONAL FEATURES . . . . . . . . . . . . . . . . . . .9

5.1 Chilled Water System—Standard Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

5.1.1 Cooling Coil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

5.1.2 Modulating Motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

5.1.3 Line Insulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

5.1.4 Three-Way Control Valve. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

5.2 Chilled Water System—Optional Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

5.2.1 Chilled Water Flow Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

5.2.2 High Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

6.0 REFRIGERATION SYSTEMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

6.1 Self-Contained Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

6.2 Split Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

6.3 Refrigeration System Components—Standard Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

6.3.1 Compressor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

6.3.2 Evaporator Coil. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

6.3.3 Safety Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

6.3.4 Expansion Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

7.0 AIR-COOLED SYSTEM—STANDARD AND OPTIONAL FEATURES . . . . . . . . . . . . . . . . . . . . . 11

7.1 Air-Cooled, Self-Contained Systems—Standard Features. . . . . . . . . . . . . . . . . . . . . . . . . . . 11

7.1.1 Pump Down Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

7.1.2 Condenser . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

7.1.3 Fan Speed Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

7.2 Air-Cooled, Self-Contained Systems—Optional Features . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

7.2.1 Liebert Lee-Temp Winter Control Condenser . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

7.2.2 Quiet-Line Condensers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

7.3 Air-Cooled Split Systems—Standard Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

7.3.1 Centrifugal Fan, Condensing Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

7.3.2 Propeller Fan Condensing Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

7.3.3 Propeller Fan Condensing Unit Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

7.4 Air-Cooled Split Systems—Optional Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

8.0 WATER/GLYCOL-COOLED SYSTEMS—STANDARD AND OPTIONAL FEATURES. . . . . . . . . . . 13

8.1 Water/Glycol Self-Contained Systems—Standard Features . . . . . . . . . . . . . . . . . . . . . . . . . 13

8.2 Water/Glycol-Cooled, Self-Contained System—Optional Features . . . . . . . . . . . . . . . . . . . . 13

8.3 Water/Glycol Split System—Standard Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

8.4 Water/Glycol-Cooled, Split System—Optional Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

8.4.1 Glycol-Cooled System—Heat Rejection Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

8.4.2 Self-Contained and Split Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

9.0 GLYCOOL SYSTEMS—STANDARD AND OPTIONAL FEATURES . . . . . . . . . . . . . . . . . . . . .15

9.1 GLYCOOL—Self-Contained Models Only . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

9.2 GLYCOOL System—Standard Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

9.2.1 Comparative Temperature Monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

9.2.2 Econ-O-Coil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

9.2.3 GLYCOOL Three-Way Control Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

9.2.4 Glycol-Regulating Valve. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

9.2.5 Drycooler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

9.3 Glycol and GLYCOOL-Cooled—Optional Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

10.0 OPTIONAL EQUIPMENT—ALL SYSTEMS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17

10.1 Steam Generating Humidifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

10.2 Adjustable Floor Stand . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

10.3 SCR Reheat. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

10.4 High-Efficiency Filter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

10.5 High External Static Blowers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

10.6 High-Efficiency Motors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

10.7 Plenums . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

10.8 Low-Profile Plenum with Cold-Aisle Discharge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

10.9 Smoke Detector. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

10.10 Firestat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

10.11 Hot Water Reheat. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

11.0 COMPREHENSIVE MONITORING SYSTEMS—OPTIONAL . . . . . . . . . . . . . . . . . . . . . . . . . . . .20

11.1 Enterprise Monitoring Systems. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

11.2 Network Monitoring Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

11.3 Stand-Alone Monitoring and Leak Detection Solutions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

12.0 COMPREHENSIVE MONITORING SOLUTIONS—OPTIONAL . . . . . . . . . . . . . . . . . . . . . . . . . .22

12.1 Liebert SiteScan® Web. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

12.2 Liebert SiteLink . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

12.3 Liebert Nform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

12.4 Liebert IntelliSlot Web/485 Card With Adapter and Liebert IntelliSlot 485 Card

With Adapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

12.5 Environmental Discrete Outputs Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

12.6 Remote Contact Monitor (RCM4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

12.7 Auto-Changeover Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

12.8 Universal Monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

12.8.1 Leak Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

12.8.2 Temperature and Humidity Recorder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

13.0 SYSTEM DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

14.0 DIMENSIONAL DRAWINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38

15.0 ELECTRICAL DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43

UIDE SPECIFICATIONS—NOMINAL 23 OR 33KW ENVIRONMENTAL CONTROL

SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . INSIDE FRONT COVER

iii

FIGURES

Figure 1 Unit configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Figure 2 Unit configurations, continued . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Figure 3 Microprocessor control systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Figure 4 Optional Views With Advanced Graphics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Figure 5 Air-cooled condenser with Liebert Lee-Temp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Figure 6 Outdoor propeller fan condensing unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Figure 7 Liebert Challenger ITR unit core . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Figure 8 Steam generating humidifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Figure 9 Adjustable floor stand . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Figure 10 Monitoring configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Figure 11 Cabinet and floor planning dimensional data—Horizontal flow models . . . . . . . . . . . . . . . . . . . . 38

Figure 12 Cabinet and floor planning dimensional data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Figure 13 Cabinet and floor planning dimensional data—Split system—5-ton centrifugal fan

condensing unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Figure 14 Cabinet and floor planning dimensional data—Split system—5-ton water/glycol-cooled

condensing unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Figure 15 Cabinet and floor planning dimensional data—Split System—Propeller fan condensing

unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Figure 16 Cabinet and floor planning dimensional data—Propeller fan condensing

modules—Vertical air discharge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Figure 17 Cabinet and floor planning dimensional data—Self-contained system—Air-cooled

condenser or drycooler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

TABLES

Table 1 Condensate pump capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Table 2 Liebert Challenger ITR air-cooled data—60 Hz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Table 3 Liebert Challenger ITR air-cooled data—60 Hz (continued) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Table 4 Liebert Challenger ITR air-cooled data—50 Hz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Table 5 Liebert Challenger ITR air-cooled data—50Hz (continued) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Table 6 Liebert Challenger ITR water cooled data, 60 Hz. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Table 7 Liebert Challenger ITR water cooled data, 60 Hz (continued) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Table 8 Liebert Challenger ITR water cooled data, 50 Hz. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Table 9 Liebert Challenger ITR water cooled data, 50 Hz (continued) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Table 10 Liebert Challenger ITR glycol cooled data, 60 Hz. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Table 11 Liebert Challenger ITR glycol cooled data, 60 Hz (continued). . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Table 12 Liebert Challenger ITR glycol cooled data, 50 Hz. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Table 13 Liebert Challenger ITR glycol cooled data, 50 Hz (continued) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Table 14 Liebert Challenger ITR chilled water data, 60 Hz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Table 15 Liebert Challenger ITR chilled water data, 50 Hz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Table 16 Liebert Challenger ITR electrical data

Table 17 Self-contained with SCR reheat * . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Table 18 Scroll compressor and main fan (for comparison purposes only) * . . . . . . . . . . . . . . . . . . . . . . . . 45

Table 19 Outdoor condensing units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

Table 20 Outdoor condensing units—Quiet-Line . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

Table 21 Indoor condensing units, air-cooled *. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

Table 22 Indoor condensing units, water-cooled * . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

Table 23 Fan speed control condensers * . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

Table 24 Liebert Lee-Temp condensers * . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

Table 25 Liebert Lee-Temp receiver heater pads for use w/CSL condensers . . . . . . . . . . . . . . . . . . . . . . . . 47

—60 Hz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Table 26 Drycooler and pump package - 95°F (35°C) ambient * . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

Table 27 Liebert Challenger ITR electrical data—50 Hz. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

Table 28 Scroll compressor and main fan (for comparison only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

Table 29 Self-contained with SCR reheat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

Table 30 Outdoor condensing units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

Table 31 Indoor condensing units air-cooled . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

Table 32 Indoor condensing units water-cooled . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

Table 33 Fan speed control condensers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

Table 34 Liebert Lee-Temp condensers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

Table 35 Liebert Lee-Temp receiver heater pads; for use w/CSL condensers . . . . . . . . . . . . . . . . . . . . . . . 50

Table 36 Drycooler only - 35°C (95°F) ambient, three-phase. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

Table 37 Drycooler only - 35°C (95°F) ambient, single phase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

Table 38 Pumps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

1.0 DEDICATED, PRECISE ENVIRONMENTAL CONTROL

For sensitive electronics, environmental control is more than simple cooling. “Comfort” air conditioning systems are designed for the comfort of people and simply cannot provide the kind of environment required by high performance computer or communication equipment.

1.1 Temperature Control

The high density heat load in a computer room or other similar application is beyond the capacity of ordinary air conditioning systems.

Sensitive electronics are best maintained in a stable environment of 72°F ±2°F (22.2°C ±1°C). Because computers and communications equipment generate large quantities of heat in small areas, six to 10 times the heat density of normal office space, the air conditioning system must have more than just enough cooling capacity. It must have the precision to react quickly to a drastic change in heat load and prevent wide temperature fluctuations—something a large building system cannot do.

1.2 Humidity Control

The electronic equipment must be protected from both internal condensation and static electricity discharges.

Maintaining the correct humidity level in the room is just as important as maintaining proper temperature. When humidity is too high, condensation may form inside electronic equipment and damage it. If humidity is too low, static electricity could disrupt operation or even shut down the electronic system. An ordinary building system cannot normally control the environment within these boundaries.

Dedicated, Precise Environmental Control

1.3 Air Volume

Computers and other sensitive electronics require greater air volumes than ordinary air conditioning can provide. Typical comfort systems are designed to provide between 300 and 400 CFM (cubic feet per minute), (500–700 CMH) per ton of cooling. Computer systems require between 500 and 600 CFM (850–1020 CMH) per ton. The high density heat load in a relatively small space requires more changes of air than a less dense “comfort” application.

While a normal office space requires only two air changes per hour, a room filled with electronic equipment requires up to 30 changes per hour. Without proper air volume, hot spots and temperature fluctuations could develop within the room. Also, greater air volumes provide the higher sensible heat ratios required by electronic computer equipment.

1.4 Air Filtration

A clean environment of properly filtered air is essential. Build-up of dust and fibers attracted by operating electronics can cause faults and impair the operation of electromechanical devices, such as switches and disk drives.

In short, today’s electronics need the same precision environmental control that mainframe computers need. The difference is that instead of one large computer room there are several small, often crowded rooms, widely dispersed throughout a building, plant or campus. Conditions and requirements can vary widely.

1.5 Year Round Operation

Comfort conditioning systems cannot be relied upon 24 hours per day 365 days per year. They are typically designed to operate 10 hours per day, from spring to autumn. Many “comfort” systems have no provision for winter operation. A precision environmental control system is designed for operation at temperatures down to -30°F (-34.4°C).

1.6 Agency Listed

Standard 60 Hz units are CSA (NRTL-C) certified. NRTL-C meets both U.S. and Canadian government safety requirements, providing fast, problem-free inspection and building code approvals. The units are also MEA listed for New York City applications.

Precision Environmental Control for Industrial, Telecommunications, Medical and Data Processing Equipment

2.0 PRECISION ENVIRONMENTAL CONTROL FOR INDUSTRIAL, TELECOMMUNICATIONS, MEDICAL AND DATA PROCESSING EQUIPMENT

Data processing power is moving from the specialized environment of the computer room to the office and the factory floor.

At the same time, the applications are growing exponentially. From yesterday’s spreadsheets and word processors, micro- to mid-range computers control LANs and WANs, manage complex telecommunications systems, optimize manufacturing processes and facilitate sophisticated testing and laboratory functions.

Computers and sensitive electronics tend to be grouped, often in specialized rooms. This makes operation and service easier, but it also creates the need for precision environmental control—the coordinated management of temperature, humidity and air filtration.

2.1 Liebert Challenger ITR

Liebert Challenger ITR provides the precision and flexibility required by a broad range of applications.

• Microprocessor-based controls (with a choice of monitoring systems based on your needs) allow you to select temperature and humidity ranges.

• A-frame coil (oriented to airflow) provides a large cooling surface area, and more precise control of temperature and humidity.

2.2 Multiple Configurations to Fit a Variety of Spaces

Though electronic equipment rooms share some common protection requirements, their application requirements can vary greatly. The room may or may not have a raised floor or an existing heat rejection loop. Budget and space requirements may limit the options a contractor has.

2.3 Efficiency in Economic Terms

The Liebert Challenger ITR occupies 9.8 square feet (.91 square meters) of floor space. It can be located either between equipment racks or at the end of a row of racks. With room floor space valued at a premium per square foot, the small footprint of the Liebert Challenger ITR makes economic good sense.

2.4 GLYCOOL

GLYCOOL is a patented Liebert process that can significantly reduce energy costs during periods of low outdoor temperatures.

The GLYCOOL system is a normal glycol system with the addition of a second cooling coil, known as an Econ-O-Coil, in the air handling unit and a three-way valve. During colder months, the glycol solution returning from the outdoor drycooler is routed to the Econ-O-Coil and becomes the primary source of cooling for the room. At ambient temperatures below 35°F (1.6°C), the cooling capacity is sufficient to handle the total cooling needs of the room. Because the compressor is responsible for the majority of the power consumption of the air conditioning unit, a GLYCOOL system can substantially reduce energy costs.

Precision Environmental Control for Industrial, Telecommunications, Medical and Data Processing Equipment

Chilled Water, Self-Contained System Water-Cooled, Self-Contained System

Plenum Available in two-way, three-way and four-way Free Discharge Grilles, Solid Plenum for ducting or low-profile, cold-aisle discharge plenum

V-Frame Coil

Condenser Water Pipes

V-Frame Coil

Scroll Compressor

Condenser

Remote Condenser Water Source (not supplied by Liebert)

IMAGES ARE

ILLUSTRATIVE ONLY

Air-Cooled, Self-Contained System

With Matching Condensers

Air-Cooled Condenser

V-Frame Co il

Scroll Compressor

Glycol-Cooled, Self-Contained System

With Matching Drycooler and Pump

Scroll Compressor

Condenser

V-Frame Coil

Glycol Piping

Drycooler

Glycol Pump

Expansion Tank

GLYCOOL-Cooled System

Scroll Compressor

Integrated GLYCOOL Coil

Condenser

Glycol Pump

Drycooler

Expansion Tank

V-Frame Coil

Glycol Piping

Figure 1 Unit configurations

Precision Environmental Control for Industrial, Telecommunications, Medical and Data Processing Equipment

Split Systems Available

Scroll Compressor

Glycol Pump

Glycol Piping

Drycooler

Expansion Tank

V-Frame Coil

Scroll Compressor

Remote Condenser Water Source (not supplied by Liebert)

Outdoor Prop-Fan Air-Cooled Condensing Unit

Indoor Centrifugal Fan Air-Cooled Condensing Unit

Indoor Water-Cooled Condensing Unit

Coaxial Condenser

Indoor Glycol-Cooled

Condensing Unit

IMAGE IS

ILLUSTRATIVE ONLY

Figure 2 Unit configurations, continued

3.0 LOCAL MONITORING SYSTEMS

Two levels of microprocessor control systems are available providing precise control and monitoring of the critical space.

The Advanced Microprocessor is standard, and the Advanced Microprocessor with Graphics is optional. The main control functions are similar for both controls.

3.1 Control

The user must enter a three-digit password before making changes.

• Temperature Setpoint 65-85°F (18-29°C)*

• Temperature Sensitivity +1-10°F (0.6-5.6°C)

• Humidity Setpoint 20-80% RH*

• Humidity Sensitivity 1-30% RH

• High Temperature Alarm 35-90°F (2-32°C)

• Low Temperature Alarm 35-90°F (2-32°C)

• High Humidity Alarm 15-85% RH

• Low Humidity Alarm 15-85% RH

* The microprocessor may be set within these ranges; however, the unit may not be able to control to extreme combinations of temperature and humidity.

Local Monitoring Systems

3.2 Control Type

Factory set-up for Intelligent Control which uses “fuzzy logic” and “expert systems” methods. Proportional and Tunable PID are user selectable options.

3.3 Internal System Control

• Compressor short cycle control: Prevents compressor short-cycling and needless compressor wear.

• System auto restart: The auto restart feature will automatically restart the system after a power failure. Time delay is programmable.

• Sequential Load Activation: On initial start-up or restart after power failure, each operational load is sequenced to minimize total inrush current.

• Hot Water / Econ-O-Coil Flush Cycles: Hot water reheat coils and Econ-O-Coils are periodically flushed to prevent a build-up of contaminants.

• Temperature/Humidity Sensor Calibration: The sensors may be calibrated from the front monitor panel to insure that all units in the room are similarly calibrated, assuring greater precision.

3.4 Monitoring

• Normal display: Includes present room temperature and humidity, active functions (cooling, heating, dehumidifying), and any alarms.

• Operating status: Displays each control operation in percent.

• Read analog inputs function: Displays the present values of up to four analog inputs.

3.5 Diagnostics

• Input diagnostics: Reviews inputs to the control system.

• Control board diagnostics: Initiates a self-test of the control system.

• Output diagnostics: Tests major components by turning them on and off from the control panel. Includes: main fan, compressor, liquid line solenoid valve, hot gas bypass valve, chilled water or chilled GLYCOOL valve, R-5 relay, reheat, hot water reheat valve, humidifier, humidifier makeup valve, and common alarm.

3.6 Logging

Advanced Microprocessor w/Graphics Control System—Optional. Backlit 240 x 128 dot matrix graphics display.

Advanced Microprocessor Control System. Backlit 4 x 20 Liquid Crystal Display.

The runtime screen provides data in either tabular or easy-to-read graphic formats.

Histograms–historical depictions–of temperature or humidity can be displayed on the screen for analysis. This is especially helpful in tracking the environmental factors of an alarm.

• Alarm history log: The Advanced Microprocessor displays the 10 most recent alarms. The Advanced Microprocessor with Graphics displays the most recent 60 alarms. Both provide a time and date stamp for each event

• Run time log: Displays run time and hours for major components (also allows reset of run hours) including compressors, GLYCOOL, fan, humidifier, and reheat.

3.7 Alarms

• Humidifier Problem • Low Suction Pressure

• High Head Pressure • Short Cycle

• Change Filter • Loss Of Power

• Loss of Air Flow Custom Alarm (Maximum of Four)

• High Temperature • Water Under Floor

• Low Temperature • Smoke Detected

• High Humidity • Standby GC Pump On

• Low Humidity • Loss Of Water Flow

• Compressor Overload—Optional • Standby Unit On

• Main Fan Overload—Optional • User-Customized Text

Figure 3 Microprocessor control systems

Local Monitoring Systems

3.8 Graphical Displays—Advanced Graphic Control Only

• Individual plots of temperature, humidity and the four analog inputs.

• Bar graph plots of individual component run history by hour.

• Floor plan of optional water detection system layout including on alarm.

Status indication of operating modes with current temperature and humidity.

Figure 4 Optional Views With Advanced Graphics

4.0 STANDARD FEATURES—ALL SYSTEMS

4.1 Cabinet and Frame

The frame, 14 gauge, MIG welded tubular and formed steel, provides maximum support while 1" (25.4mm) deep steel panels with 1-1/2 lb. (.68 kg) insulation protect and quiet the system. The front door can be opened for service without shutting off the system. All components are accessible for service/maintenance through the front and rear of the unit.

The Liebert Challenger ITR’s resistance to corrosion is enhanced by the black, powder-coat finish to all frame components. Exterior panels are similarly protected with durable powder-coating.

4.2 Electrical Panel

The high voltage compartment contains the contactors, transformers and overloads and all other high-voltage components.

Each high voltage component is protected by a separate overcurrent protective device. The entire high voltage panel is enclosed by a safety lock dead front panel. When the front door is opened by operating personnel, the high voltage components remain enclosed for operator safety.

4.3 Fan Section

The Liebert Challenger ITR features a quiet, low speed fan assembly with double inlet blower, lifetime lubrication and self-aligning ball bearings. The motor and variable pitch drive are mounted on an adjustable base. The entire blower/ motor assembly is mounted on vibration isolators for smoother operation.

Standard Features—All Systems

The draw-through design of the fan section provides even air distribution across the coil, controlled air for bypass humidification, elimination of air bypass around the filters and low internal cabinet pressure drop.

4.4 Infrared Humidifier

High-intensity quartz lamps over the stainless steel humidifier pan permit clean, particle-free vapor to be added to the air within 5 to 6 seconds of the electronic call from the microprocessor control.

The quartz lamps provide radiant energy that evaporates water in a pure state, without solids.

The Infrared Humidifier is equipped with an automatic water supply system that significantly reduces cleaning maintenance. This system has an adjustable water over-feed to prevent mineral precipitation. A drain valve is provided to easily empty the humidifier pan prior to inspection or servicing. A control valve regulates flow at water pressures between 5 and 150 psig (34.5 and 1034 kPa) and includes a Y-strainer.

4.5 Electric Reheat

The two-stage 304 stainless steel reheat elements are a rigid, fin-tubular design that have extended operation life. The reheat has ample capacity to maintain room dry-bulb conditions during a system call for dehumidification. The two stages give an accurate, controlled response to the requirements of the computer room. The low watt density, electrically enclosed elements are surrounded by the tube and fins, reducing sheath temperatures and eliminating ionization.

4.6 Filters

The standard pleated 2" (51mm) filter with an efficiency of 20% (based on ASHRAE 52.1) can be changed quickly and easily through the front of the unit.

4.6.1 Condensate Pump

Disconnect Switch

(Locking)

The condensate pump, mounted in the bottom of most units, is used for unit drain water only. The condensate pump is complete with sump, motor and pump assembly and automatic control.

The standard model has single float. A dual-float condensate pump, which includes connections to unit, common alarm, unit shutdown and one customer N/O contact is also available.

Table 1 Condensate pump capacity

Capacity

Voltage Hz

200/230 50 50 (189) 10 (30)

208/230 60 50 (189) 17 (51)

380/415 50 200 (757) 26 (78)

460 60 200 (757) 43 (128)

GPH (l/s)

Head Pressure

ft. (kPa)

4.6.2 Remote Temperature/ Humidity Sensors

The remote temperature/ humidity sensors permit monitoring room conditions from an external source. They are encased in an attractive case and are provided with a plug compatible shielded cable in virtually any length.

Standard Features—All Systems

4.6.3 Disconnect Switch—Locking Type

The locking disconnect switch, mounted in the electrical panel, is connected to the safety lock dead front panel of the system and is interlocked mechanically. In this way the panel can’t be opened until the switch is in the off position. And it complies with local codes as well as those of the NEC.

Chilled Water System—Standard and Optional Features

5.0 CHILLED WATER SYSTEM—STANDARD AND OPTIONAL FEATURES

5.1 Chilled Water System—Standard Features

5.1.1 Cooling Coil

The chilled water cooling coil is designed for closed-loop applications using properly maintained water. It is constructed of copper tubes and aluminum fins. To ensure quality, the V-frame coil is manufactured to the highest standards in the industry.

5.1.2 Modulating Motor

The flow of chilled water through the cooling coil is controlled by an electronic modulating motor. The microprocessor control will activate the motor when a need for cooling or dehumidification exists. The motor will position the valve to precisely match the needs of the conditioned space.

5.1.3 Line Insulation

All chilled water piping within the Liebert Challenger ITR is fully insulated to assure full system capacity and prevent condensation.

5.1.4 Three-Way Control Valve

The fully insulated control valve gives the conditioned space the precise cooling needed by electronic equipment. Its unique design requires no overtravel linkages and never requires adjustment.

5.2 Chilled Water System—Optional Features

5.2.1 Chilled Water Flow Switch

The flow switch will activate the alarm system and/or shut down the system should the chilled water supply be interrupted. The switch is factory wired and mounted in the chilled water valve compartment.

5.2.2 High Pressure

For special applications, a high-pressure, modulating three-way or two-way valve can be provided. The valve is designed for 400 psig (2758 kPa) water pressure.

6.0 REFRIGERATION SYSTEMS

Two versions are available:

• Self-Contained Systems

• Split Systems

6.1 Self-Contained Systems

These systems feature a scroll compressor and controls, expansion valve, hot gas bypass and evaporator coil in the room unit.

Air-Cooled models also include a crankcase heater on the compressor and require field connection to remote air-cooled condenser.

Water, Glycol and GLYCOOL models also include a coaxial condenser with field connections required to the water or glycol coolant loop.

Water/Glycol models have two-way WRV with bypass.

GLYCOOL models have three-way WRV.

6.2 Split Systems

These systems feature the evaporator coil and expansion valve in the room unit, with the scroll compressor, and the condensing equipment located in one of several different types of pre-charged condensing units.

Refrigeration Systems

6.3 Refrigeration System Components—Standard Features

6.3.1 Compressor

The heart of the refrigeration system is the compressor.

All self-contained evaporator units and split system condensing units contain a high efficiency, quiet operating scroll compressor. The compressors have internal vibration isolating mountings, pressure safety controls and built-in overload protection.

6.3.2 Evaporator Coil

The evaporator coil is designed for the high sensible heat ratio required by electronic equipment applications. The copper tube, aluminum fin coils are configured in a V-frame for smooth air flow through the unit.

6.3.3 Safety Control

Every Liebert Challenger compressor has a high-pressure switch with an exclusive manual reset after high pressure cut-out. This prevents cycling the compressor at high pressure, resulting in greater efficiency and longer compressor life.

6.3.4 Expansion Valve

The externally equalized thermostatic expansion valve smoothly controls the flow of refrigerant through the coil and provides precise control of superheat.

Air-Cooled System—Standard and Optional Features

Air-Cooled Condenser

Liebert Lee-Temp Package (optional)

7.0 AIR-COOLED SYSTEM—STANDARD AND OPTIONAL FEATURES

7.1 Air-Cooled, Self-Contained Systems—Standard Features

7.1.1 Pump Down Control

The compressor pump-down control is accomplished by a liquid-line solenoid valve used in conjunction with a low pressure switch.

7.1.2 Condenser

The Liebert manufactured low profile, direct drive propeller fan type air-cooled condenser provides quiet, efficient operation.

It is constructed of aluminum with a copper tube and aluminum fin coil for corrosion resistance. An integral, factory wired and tested control panel reduces installation time.

7.1.3 Fan Speed Control

The winter control system features a variable speed motor and a specially designed solid-state fan speed control transducer.

The transducer senses refrigerant pressure and varies the speed of the fan motor to maintain constant condensing temperature and system capacity. This system permits operation at ambient temperatures as low as -20°F (-29°C).

7.2 Air-Cooled, Self-Contained Systems—Optional Features

7.2.1 Liebert Lee-Temp Winter Control Condenser

The Liebert Lee-Temp winter control system’s heated receivers permit startup and positive head pressure control at ambient temperatures as low as -30°F (-34.4°C). The Liebert Lee-Temp package includes insulated receiver, a pressure relief valve, three-way head pressure control valves, and rotalock valves (see Figure 5 below).

7.2.2 Quiet-Line Condensers

Quiet-Line Condensers can help your facility meet the strictest noise codes, and do so at less cost than traditional condensers with acoustical shielding.

Figure 5 Air-cooled condenser with Liebert Lee-Temp

Air-Cooled System—Standard and Optional Features

7.3 Air-Cooled Split Systems—Standard Features

7.3.1 Centrifugal Fan, Condensing Unit

The centrifugal condensing unit’s copper-tube, aluminum-fin coil is equipped with low-temperature controls to ensure year-round operation to -20°F (-29°C). The condensing unit is factory-wired, charged and tested and is ready for final connections.

The centrifugal fan condensing unit includes scroll compressor, condenser coil, centrifugal blower assembly, high-pressure switch and Liebert Lee-Temp head pressure control.

Condensing unit has hot gas bypass standard feature which bypasses hot gas around the compressor directly to the suction side of the compressor to provide capacity control and reduce compressor cycling. System includes liquid injection valve to maintain proper suction superheat.

Unit must be mounted indoors. Duct flanges are provided.

7.3.2 Propeller Fan Condensing Unit

The air-cooled condensing unit can be mounted on the roof or a ground level site. The condensing unit housing is manufactured of galvanized steel with a powder coat finish. The copper-tube, aluminumfin coil is equipped with low temperature controls to assure year-round operation to -30°F (-34.4°C). The condensing unit is completely factory-wired, charged and tested and is ready for final connections. (See illustration below)

The standard prop fan condensing unit includes scroll compressor, prop fan, high head pressure switch, hot gas bypass and Liebert Lee-Temp head pressure control (for operation down to -30°F (39°C) ambient.)

Figure 6 Outdoor propeller fan condensing unit

7.3.3 Propeller Fan Condensing Unit Options

This unit is available in these optional configurations:

• 105°F (40°C) ambient for high ambient conditions.

• 95°F (35°C) ambient Quiet-Line for low noise level conditions below 58 dBa.

7.4 Air-Cooled Split Systems—Optional Features

Factory-installed, non-fused disconnect switch allows turning off the Challenger ITR for maintenance. Disconnect switch is available on indoor condensing units only.

Water/Glycol-Cooled Systems—Standard and Optional Features

8.0 WATER/GLYCOL-COOLED SYSTEMS—STANDARD AND OPTIONAL FEATURES

8.1 Water/Glycol Self-Contained Systems—Standard Features

Liquid-Cooled Condensers

A co-axial condenser provides ample capacity to handle the heat rejection needs of the system while using a minimum of liquid and low total pressure drop.

Regulating Valves

Head pressure operated regulating valves accurately control the condensing temperature and maintain system capacity for various entering liquid flow rates and temperatures. Two-way valves with bypass are standard.

8.2 Water/Glycol-Cooled, Self-Contained System—Optional Features

Three-way Regulating Valves

Three-way valves provide accurate control of condensing temperature and thus maintain constant system capacity while also keeping the condenser water flow rate constant.

High Pressure

The high pressure option for the condenser circuit consists of a regulating valve and a condenser rated at 350 psig (2413 kPa) water-pressure. This option is required in applications with large static head pressures.

Compressor Crankcase Heater

A compressor crankcase heater is available to prevent the migration of refrigerant to the compressor during off cycles.

Hot Gas Reheat

The hot gas reheat assembly consists of a three-way directional solenoid operated valve and a hot gas reclaim coil.

70/30 Cu-Ni Econ-O-Coil

This coil replaces the standard copper tube coil to provide improved resistance to corrosion. This option must be specified whenever a GLYCOOL or Dual Cooling Source system is applied to a cooling tower loop or other open water system.

8.3 Water/Glycol Split System—Standard Features

Water/Glycol-Cooled Condensing Units

Factory charged and sealed, the water-cooled condensing unit is ready to be installed quickly and easily. The counter-flow coaxial condenser with two-way or three-way regulating valve designed for 150 psi (1034.3 kPa) is matched to the heat rejection requirements of the compressor for a variety of flow rates and fluid temperatures.

Condensing unit has a hot gas bypass standard feature that bypasses hot gas around the compressor directly to the suction side of the compressor to provide capacity control and reduce compressor cycling. System includes liquid injection valve to maintain proper suction superheat.

Water/Glycol-Cooled Systems—Standard and Optional Features

8.4 Water/Glycol-Cooled, Split System—Optional Features

High Pressure

The high pressure option for the condenser circuit consists of a two-way or three-way water regulating valve and condenser rated at 350 psig (2413 kPa) water pressure. This option is required in applications with large static heads.

Factory Installed Non-Fused Disconnect Switch

Allows unit to be turned off for maintenance. Disconnect switch is available on indoor condensing units only.

70/30 Cu-Ni Econ-O-Coil

8.4.1 Glycol-Cooled System—Heat Rejection Devices

8.4.2 Self-Contained and Split Systems

Fan Speed Control Drycooler

The Liebert manufactured Fan Speed Control drycooler is constructed of aluminum and features copper tubes and aluminum fin design. It is low profile, propeller fan type and provides quiet, trouble free heat rejection. The drycooler features a variable speed fan motor and a specially engineered solid state fan speed transducer. The transducer senses the temperature of the leaving glycol and modulates the speed of the fan to maintain proper glycol temperatures. An integral, factory-wired and tested control panel reduces installation time.

Glycol Pump

The glycol system includes a matching centrifugal glycol pump. It is mounted in a vented, weatherproof enclosure. Optional Equipment—See page 16.

GLYCOOL Systems—Standard and Optional Features

9.0 GLYCOOL SYSTEMS—STANDARD AND OPTIONAL FEATURES

9.1 GLYCOOL—Self-Contained Models Only

The Liebert GLYCOOL free-cooling system is integrated with a glycol-cooled Liebert Challenger ITR.

At outdoor temperatures below 35°F (1.6°C), the Econ-O-Coil is capable of providing total system capacity. At outdoor temperatures between 35° and 65°F (1.6° and 18.3°C), the unique modulating valve permits partial cooling of the space by the Econ-O-Coil with the DX system picking up the rest of the load. Above 65°F (18.3°C) the unit functions as a glycol unit and all the cooling is accomplished by the DX system. When cooling is required, the three-way modulating valve and water regulating valve direct glycol (from the heat rejection loop) to the Econ-O-Coil located upstream of the evaporator coil, to the condenser, or to both.

The GLYCOOL system contains all the standard features of a glycol-cooled system plus the following.

9.2 GLYCOOL System—Standard Features

9.2.1 Comparative Temperature Monitor

A solid-state temperature monitor compares the room air temperature and entering glycol temperature. When air temperature is higher than glycol temperature, the monitor communicates to the microprocessor control that “free-cooling” is available.

9.2.2 Econ-O-Coil

The Econ-O-Coil is strategically located in the return air stream of the environmental control system. This coil is designed for closed-loop applications using properly treated glycol solutions. Applications using a cooling tower loop or other open water system must specify a 70/30 Cu-Ni Econ-O-Coil for improved corrosion resistance.

The air is first filtered before entering the coil and then is either precooled or totally cooled before entering the refrigeration coil. The glycol flow to the coil is controlled by a pre-piped modulating three-way valve. When supplied with a 45°F (7.2°C) glycol solution, the coil is sufficiently sized to offer the identical cooling capacity as is obtained during the refrigeration cycle of the compressor.

9.2.3 GLYCOOL Three-Way Control Valve

The GLYCOOL Three-Way Control Valve opens full anytime the temperature of the glycol solution is below room temperature, to take full advantage of all possible free cooling. As the outdoor ambient drops, the three-way control valve modulates the flow to the Econ-O-Coil. It maintains constant temperature in the room and includes operating linkage and electronic motor. Unlike other valves of this nature, there is no over travel linkage or end switches to be adjusted.

9.2.4 Glycol-Regulating Valve

A head pressure operated glycol regulating valve accurately controls the condensing temperature and system capacity for various entering glycol temperatures. The valve has three-way action.

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