Liebert® 10 Fan Drycooler/Fluid
Cooler™
Including Quiet-LineModels, 120to150Tons,
50&60Hz
User Manual
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.VertivCo.com/en-us/support/ for additional assistance.
TABLE OF CONTENTS
1 Introduction 1
1.1 System Description and Standard Features 1
1.2 Optional Features 1
2 Product Performance Data & Selection 5
2.1 Standard Data 5
2.2 Typical Application 7
2.3 Engineering Data, Calculations and Selection Procedure 8
2.4 Selection Example 11
3 Installation 13
3.1 Location Considerations 13
3.2 Site Preparation 15
3.3 Equipment Inspection Upon Delivery 16
3.4 Lifting and Handling the Drycooler 16
3.4.1 Unit Weight 17
3.5 Piping Connections 17
3.5.1 Expansion Tanks, Fluid Relief Valves and Other Devices 18
3.6 Filling Instructions 22
3.6.1 Preparing the System for Filling 22
3.6.2 Glycol Solutions 22
3.6.3 Filling the System 23
3.7 Electrical Connections 24
3.7.1 Line Voltage 24
3.7.2 Low Voltage Control Wiring 25
3.8 Checklist for Completing Installation 26
4 Operation 29
4.1 Initial Startup Procedure 29
4.1.1 Control Setpoints 29
4.1.2 Current-Sensing Relays 30
4.1.3 Cold Weather Operation 31
5 System Maintenance 33
5.1 General Procedures 33
5.2 Special Procedures 34
5.2.1 Drycooler Cleaning 34
5.2.2 Maintenance Inspection Checklist 35
6 Troubleshooting 37
Vertiv | Liebert® 10-fan Drycooler User Manual | i
Vertiv | Liebert® 10-fan Drycooler User Manual | ii
Important Safety Instructions - Save These Instructions
This manual contains important safety instructions that should be followed during the installation and
maintenance of the Liebert®10 Fan Drycooler™. Read this manual thoroughly before attempting to install
or operate this unit.
Only properly trained and qualified personnel should move, install or service this equipment.
Adhere to all warnings, cautions and installation, operating and safety instructions on the unit and in this
manual. Follow all operating and user instructions.
WARNING! Arc flash and electric shock hazard. Disconnect all electric power supplies and wear
protective equipment per NFPA 70E before working within electric control enclosure. Failure to
comply can cause serious injury or death.
Customer must provide earth ground to unit, per NEC, CEC and local codes, as applicable.
Before proceeding with installation, read all instructions, verify that all the parts are included
and check the nameplate to be sure the voltage matches available utility power.
The line side of the disconnect switch on the front of the unit contains live high-voltage.
The only way to ensure that there is NO voltage inside the unit is to install and open a remote
disconnect switch. Refer to unit electrical schematic.
Follow all local codes.
WARNING! Risk of high-speed moving parts. Can cause injury or death.
Disconnect all local and remote electric power supplies before working in the unit.
Do not operate this unit with any or all cabinet panels and/or blower guards removed.
CAUTION: Risk of contact with hot surfaces. Can cause injury.
The blower motors may become extremely hot during unit operation. Allow sufficient time for
them to cool before working within the unit cabinet. Use extreme caution and wear protective
gloves and arm protection when working on or near hot blower motors.
CAUTION: Risk of sharp edges, splinters and exposed fasteners. Can cause injury.
Only properly trained and qualified personnel wearing appropriate safety headgear, gloves,
shoes and glasses should attempt to move the unit, lift it, remove packaging or prepare the unit
for installation.
Vertiv | Liebert® 10-fan Drycooler User Manual | iii
NOTICE
NOTICE
NOTICE
Risk of clogged or leaking coolant fluid lines. Can cause equipment and building damage.
Improper installation, application and service practices can result in coolant fluid leakage from
the unit that can result in severe property damage.
Vertiv™ recommends installing leak detection equipment for unit and supply lines.
Risk of a leaking coil due to freezing and/or corrosion. Can cause equipment and building
damage.
Cooling coils and piping systems that are connected to open cooling towers or other open
water/glycol systems are at high risk for freezing and premature corrosion. Fluids in these
systems must contain the proper antifreeze and inhibitors to prevent freezing and premature
coil corrosion. The water or water/glycol solution must be analyzed by a competent water
treatment specialist before startup to establish the inhibitor requirement. The water or
water/glycol solution must be analyzed every six months to determine the pattern of inhibitor
depletion. The complexity of water-caused problems and their correction makes it important to
obtain the advice of a water treatment specialist and follow a regularly scheduled maintenance
program.
Risk of damage from forklift. Can cause unit damage.
NOTICE
Keep tines of the forklift level and at a height suitable to fit below the skid and/or unit to
prevent exterior and/or underside damage.
Risk of improper storage. Can cause unit damage.
Keep the Liebert 10-Fan Drycooler upright and protected from freezing temperatures and
contact damage.
Vertiv | Liebert® 10-fan Drycooler User Manual | iv
1 INTRODUCTION
1.1 System Description and Standard Features
The Liebert® 10 Fan Drycooler/Fluid Cooler™ is designed for maximum heat rejection with minimum
footprint and to be used with glycol solutions for large-site installations. It has a nominal range of 150tons
of heat rejection and is ideal for rejecting the heat of multiple evaporator units. Standard features include:
• Three different coil circuits: 068 (half), 136 (full), 272 (double). Each coil circuit is designed for a
range of specific flow rates based on the particular application.
• Coil constructed of copper tubes in a staggered pattern expanded into continuous corrugated
aluminum fins. The fins have full depth fin collars completely covering the copper tubes which
are connected to heavy-wall type L headers. Inlet coil connector tubes pass through relieved
holes in the tube sheet for maximum resistance to piping strain and vibration. Coil maximum
operating pressure is 150 PSIG (1035 kPa).
• Wire guards constructed of coated wire, in 1" x 4" pattern, mounted to protect the exposed
vertical coil surface.
• Current sensing relays are provided with customer connection to monitor change in motor
current to detect possible motor/fan failure.
• Choice of either 60 or 50Hz models as well as a Liebert Quiet-Line™ 60Hz; comes from the
factory completely assembled and pre-wired. Units are available in 208, 230, 460 and 575V, 3phase, 60Hz, and 380/415V, 3-phase, 50Hz.
• Locking disconnect switch and fan cycling control.
• Unit frame of heavy galvanized steel for strength and corrosion resistance, divided internally
into individual fan sections by full-width baffles to prevent fan reverse windmilling when not
energized.
1.2 Optional Features
Quiet-Line
The Liebert Quiet-Line 10 Fan Drycooler includes the same features as the standard Liebert10 Fan
Drycooler, except that it has 8-pole motors in lieu of 6-pole motors for lower sound levels as well as
reduced airflow and capacity. This option is not available on 50Hz units.
Aluminum Grilles
Aluminum grilles are used for unit aesthetic and general mechanical security purposes. The aluminum
grilles extend from the base of the unit and protect the exposed coil sides.
Coil Fin Options
Pre-Coated Fin Stock provides pre-coated coil fins for added protection in corrosive environments.
Phenolic Coated Coil provides a baked phenolic coated coil for added protection in corrosive
environments.
Copper Fin/Copper Tube Coil provides coil constructed of copper fins and copper tubes.
Vertiv | Liebert® 10-fan Drycooler User Manual | 1
Enclosed Motor Option
TEAO motors are totally enclosed and are used in industrial applications. They are not available for
Liebert Quiet-Line, or 575V models.
Ancillary Items
Tanks for fluid expansion, pumps, pump control panels, flow switches, shut off valves and relief valves
should also be considered for the site/installation. Since these items are custom-sized per application,
please consult with your sales representative for selection.
Vertiv | Liebert® 10-fan Drycooler User Manual | 2
Figure 1.1 Typical application
Vertiv | Liebert® 10-fan Drycooler User Manual | 3
Refer to Typical piping diagram on page19 for a detailed installation diagram.
Vertiv | Liebert® 10-fan Drycooler User Manual | 4
2 PRODUCT PERFORMANCE DATA & SELECTION
2.1 Standard Data
Vertiv | Liebert® 10-fan Drycooler User Manual | 5
6.....Liebert® 10-fan Drycooler User Manual
Shipping
Weight
Internal
Volume
Air Flow Sound
No.ofFans
No. &
Size of
Connec-
tions
(outlet)
No. &
Size of
Connec-
tions
(inlet)
No. of
Internal
Circuits
Pressure
Drop
Flow
Rate
Total Heat
Rejection* @25°F
(13.9°C) ITD
Btu/h kW gpm lps Ft of Water kPa cfm cmh dBA** Gal L Lbs Kg
1,172,000 343 136 8.6 27.2 81.2 68 2@2.625 2@2.625 10 74160 126000 65 92.8 351 5100 2313
1,447,000 424 272 17.2 15.8 47.1 136 2@4.125 2@4.125 10 74160 126000 65 92.8 351 5100 2313
1,579,000 463 544 34.3 15.1 45.1 272 2@4.125 2@4.125 10 74160 126000 65 92.8 351 5100 2313
1,287,000 377 136 8.6 27.3 81.5 68 2@2.625 2@2.625 10 99030 168250 72 92.8 351 5100 2313
1,703,000 499 272 17.2 1 5.8 4 7.1 136 2@4.125 2@4.125 10 99030 168250 72 92.8 351 5100 2313
1,924,000 564 544 34.3 15.1 45.1 272 2@4.125 2@4.125 10 99030 168250 72 92.8 351 5100 2313
1,218,000 357 136 8.6 27.3 81.5 68 2@2.625 2@2.625 10 82450 1 40080 68 92.8 351 5100 2313
1,541 ,000 452 272 17.2 15.8 47.1 136 2@4.125 2@4.125 10 82450 140080 68 92.8 351 5100 2313
1,703,000 499 544 34.3 15.1 45.1 272 2@4.125 2@4.125 10 82450 1 40080 68 92.8 351 5100 2313
Hz
Model
Table 2.1 Drycooler Performance Data
No.
120 60
150 60
150 50
* Ratings based on using 40% ethylene glycol @ 95°F (35°C) entering air, 120°F (48.9°C) enteringglycol; 2 gpm (.13 l/s) circ.
** Sounddata is for sound pres sure measured @ 5 ft. (1.5m) height, 30 ft.(9.1 m) from the unit.
Table 2.2 Drycooler Performance Data per Circuit
Model Hz
120 60
150 60
150 50
* Data is based on 4 0% ethylene glycol solutionat 1 15°F ( 46.1° C) average solution temperature expressed inBtu/h.
No. of
Internal
Circuits
68 68-136 29,507 39,991 46,972 8.2 16.1 27.3
136 136-34 0 45,829 53,713 57,917 5 9.2 23.7
272 272-544 56,201 60,785 63,153 4 8.7 15.1
68 68-136 30,144 42,440 51,621 8.2 16.1 27.3
136 136-34 0 50,346 61,660 68,219 5 9.2 23.7
272 272-544 65,785 73,11 8 77,019 4 8.7 15.1
68 68-136 29,791 41,011 4 8,823 8.2 16.1 27.3
136 136-34 0 47,617 56,724 61,728 5 9.2 23.7
272 272-544 59,756 65,257 68,146 4 8.7 15.1
Flow Rate Range
min-max
gpm
Heat Rejection per ITD* (Btu/h/°F) Pressure Drop* (ft of water)
Flow Rate per Circuit (gpm/circuit) Flow Rate per Circuit (gpm/circuit)
1 1.5 2 1 1.5 2
Table 2.3 Drycooler Performance Data per Circuit—Metric
Heat Rejection per ITD* (kW/°C) Pressure Drop* (kPa)
Model
No.
Hz
No. of
Internal
Circuits
Flow Rate
Range min-max
lps
Flow Rate per Circuit (lps/circuit) Flow Rate per Circuit (lps/circuit)
0.06 0.09 0.13 0.06 0.09 0.13
68 6-13 23.9 29.8 32.1 24.5 48.0 81.5
120 60
150 60
150 50
* Data is based on 4 0% ethylene glycol solutionat 4 6.1°C (115°F) average solution temperature expressed inkW.
136 13-26 30.8 31.9 32.0 14.9 27.5 70.7
272 26-38 30.7 30.6 30.5 11.9 26.0 45.1
68 6-13 24.9 33.1 37.5 24 .5 48.0 81.5
136 13-26 36.0 39.1 39.8 14.9 27.5 70.7
272 26-38 37.9 38.4 39.0 11.9 26.0 4 5.1
68 6-13 24.4 31.1 34.2 24.5 48.0 81.5
136 13-26 32.8 34.6 34.7 14.9 27.5 70.7
272 26-38 33.3 33.4 33.3 11.9 26.0 45.1
2.2 Typical Application
The most popular use for the Liebert® 10 Fan Drycooler™ is at sites with large cooling loads, such as data
center/telecom sites where multiple indoor air conditioners are used. See 2.2 abovefor a general outline of
suggested quantity of indoor units for each Liebert 10 Fan Drycooler or contact your Vertiv™
representative for custom matchup. See Typical application on page3.
Vertiv | Liebert® 10-fan Drycooler User Manual | 7
Table 2.4 Maximum Liebert evaporator units per Every 10 Fan Drycooler
Liebert Deluxe
Model 60 Hz
(50 Hz)
110 G
(111 G)
116 G
(121 G)
192 G
240 G
363 G
1. Ratings based on using40% ethylene glycol @ listed outdoor ambient rating temperature, 120°F (48.9°C) entering glycol. Selections are validfor
standard or TEAO motors. Consult your localLiebert representative for Quiet-Line selections.
Liebert
Deluxe
Unit
Capacity
8 tons
(28.1 kW)
10 tons
(35.2 kW)
15 tons
(52.7 kW)
20 tons
(70.3 kW)
30 tons
(105 kW)
Maximum
Deluxe
Units/10 Fan
Drycooler
12 95°F (35°C) 384 (24.2) D*N*150**272
9 100°F ( 37.8°C) 288 (18.2)
6 105°F (40.6°C) 192 (12.1)
10 95°F (35°C) 380 (24.0) D*N*150** 272
7 100°F (37.8°C) 266 (16.8)
5 105°F (40.6°C) 190 (12.0)
7 95°F (35°C) 378 (23.8) D*N*150**272
5 100°F (37.8°C) 270 (17.0)
4 105°F (40.6°C) 216 (13.6)
6 95°F (35°C) 402 (25.4) D*N*150* *272
4 100°F (37.8°C) 268 ( 16.9)
3 105°F (40.6°C) 201 (12.7)
4 95°F (35°C) 31 2 (19.7) D*N*150**272
3 100°F (37.8°C) 234 (14.8)
2 105°F (40.6°C) 156 (9.8)
Outdoor
Ambient
Rating
Total Syst em
gpm (lps)
Drycooler
Model #
D*N*150* *136
D*N*150* *136
D*N*150* *136
D*N*150* *136
D*N*150* *136
1
2.3 Engineering Data, Calculations and Selection Procedure
An alternate, detailed procedure is available to calculate values and select the correct the 10 Fan
Drycooler(s) for the application. This can be used to assist in selecting drycoolers for applications for
ambient conditions that are not standard. Use the following steps.
1. Determine the following items to begin this procedure:
• Design outdoor ambient air temperature, Toa(F or C)
• Fluid Flow Rate, VT(gpm or lps)
• % ethylene glycol concentration
• Fluid temperatures at drycooler: Entering, Tefand leaving Tlf(F or C), or
• Total Required Heat Rejection, QRT(Btu/h or kW) and one of the fluid temperatures
above
2. Find the following values using these equations and known values above:
• Initial Temperature Difference (ITD) of entering fluid to outdoor design air,
ITD = Tef- T
• Total Required Heat Rejection, QRT= VT* cv* (Tef- Tlf), where cvis found in the following
table, or
• Leaving fluid temperature, Tlf= Tef- QRT/ (VT* cv) where cvis found in the following
table.
3. Find the Average Fluid Temperature, T
oa
= (Tef+ Tlf) / 2
f,avg
Vertiv | Liebert® 10-fan Drycooler User Manual | 8
4. Find Required Heat Rejection per ITD, QR
= QRT/ (ITD * f), where f is the capacity
ITD
correction factor found in Capacity Correction Factor on the next page.
5. Using Product Performance Data & Selection on page5 with columns titled Flow Rate Range
and Heat Rejection per ITD, choose the Drycooler Model matching application fluid flow rate
and meeting/exceeding the required Heat Rejection per ITD, QR
from Step4. above.
ITD
6. Find the Flow Rate per Circuit, VC= VT/ circuits for the drycooler selected in Product
Performance Data & Selection on page5. This should be in the range of 1.0 to 2.0 gpm/circuit
(0.06 to 0.13 lps/circuit) for proper long-term performance.
7. In Product Performance Data & Selection on page5, for the selected Model Number, find the
Actual Heat Rejection per ITD using the gpm/circuit from Step6. above. You may interpolate
between columns as required. The Actual Heat Rejection should be equal to or greater than
per ITD, QR
(higher altitude application sites should use correction factors to reduce Actual
ITD
Heat Rejection results). If it is less, repeat process from Step5. above using a larger model. If 10
Fan Drycooler solution is oversized, lower capacity drycoolers are available and may be
considered as an alternative solution.
8. Calculate the Total Actual Heat Rejection, QA, for the drycooler, using the Actual Heat
Rejection per ITD (Step7. above) and actual ITD and correcting for % glycol and AFT (see
Capacity Correction Factor on the next page).
QA = QA
ITD
* ITD * f
9. After selecting a model, look up the unit’s Pressure Drop in Product Performance Data &
Selection on page5. Multiply this pressure drop by the correction factor found in Pressure
drop correction factor on page11. If the resulting pressure drop is higher than your system
design, go back to Step5. above and select a model with more circuits or consider multiple
units. Contact your sales representative for additional design assistance.
10. Electrical data for model selected is found in Electrical Specifications on page11.
Table 2.5 Specific Heats for Aqueous Ethylene Glycol Solutions (Cv)
% Ethylene Glycol 0% 10% 20% 30% 40% 50%
Btu/h/gpm°F 500 490 480 470 450 433
kW/lps°C 4.18 4.09 4.01 3.93 3.76 3.62
Table 2.6 Altitude Correction
Alt it ude - Feet (M)
Correction Factor 1 .000 0.979 0.960 0.900 0.841 0.762 0.703
0
(0)
1000
(305)
2000
(610)
5000
(1525)
8000
(2440)
12000
(3660)
15000
(4575)
Vertiv | Liebert® 10-fan Drycooler User Manual | 9
Figure 2.1 Capacity Correction Factor
Vertiv | Liebert® 10-fan Drycooler User Manual | 10
Figure 2.2 Pressure drop correction factor
Table 2.7 Electrical Specifications
Voltag
Drycool
er
Model
D0N*150
DTN*1 50 TEAO 70 72 90 70 72 90 35 36 45 n/a n/a n/a n/a 32 35
DGN*120 QuietLine 48 50 60 48 50 60 24 25 30 28 30 35 24 25 30
ePhase
Motor
Type
STANDA
RD
60 Hz 50 Hz
208-3 230-3 460-3 575-3 380/415-3
FLAMCAOPDFLAMCAOPDFLAMCAOPDFLAMCAOPDFLAMCAOP
D
70 72 90 70 72 90 35 36 45 28 30 35 35 36 40
2.4 Selection Example
For the following example, English (I-P) units will be used. Metric units are also provided in the tables and
figures.
Find a drycooler to cool 340 gpm of 20% ethylene glycol/water solution from 125°F to 115°F. Application is
near sea level and has an outdoor design air temperature of 95°F.
Vertiv | Liebert® 10-fan Drycooler User Manual | 11
1. Assume the following values:
• Toa= 95°F
• VT= 340 gpm
• 20% ethylene glycol
• Tef= 125°F
• Tlf= 115°F
2. Initial temperature difference, ITD = Tef- Toa= 125 - 95 = 30°F
• Since Tefis known, calculate Total Required Heat Rejection, QRT= VT* cv* (Tef- Tlf)
• Using Specific Heats for Aqueous Ethylene Glycol Solutions (Cv) on page9, cv= 480 for
20% ethylene glycol.
• QRT= 340 gpm * 480 Btu/h / gpm°F * (125°F - 115°F) = 1,632,000 Btu/h
3. Average Fluid Temperature, T
4. Required Heat Rejection per ITD, QR
= (Tef+ Tlf) / 2 = 125°F + 115°F) / 2 = 120°F
f,avg
= QRT/ (ITD * f), where f is found from Figure 2.1 on
ITD
page10.
• Using Figure 2.1 on page10, f = 1.04 for 120°F and 20% EG concentration.
• QR
= 1,632,000 Btu/h / (30°F * 1.04) = 52,300 Btu/h / °F
ITD
5. Locate Model Number(s) in Product Performance Data & Selection on page52 on page5,
matching flow rate of 340 gpm and meeting or exceeding 52,300 Btu/h / °F. Either Model 120
with 272 circuits or the Model 150 with 272 circuits matches the flow rate requirements and
meets or exceeds the Required Heat Rejection per ITD. For this example, Model 150 will be
chosen to complete the procedure.
6. Flow rate per circuit, VC= VT/ circuits = 340 gpm / 272 circuits = 1.25 gpm/circuit. This is within
the 1.0 to 2.0 gpm/circuit range.
7. Using Product Performance Data & Selection on page5, the actual Heat Rejection per ITD,
QA
for Model 150 with 272 circuits @ 1.25 gpm/circuit is 69,526 Btu/h / °F, which exceeds our
ITD
Required Heat Rejection per ITD of 52,300 Btu/h / °F. No correction for altitude is required.
8. Total Actual Heat Rejection for the drycooler, QA = QA
* ITD * f, where f is found in Capacity
ITD
Correction Factor on page10.
• QA = 69,526 Btu/h / °F * 30°F * 1.04 = 2,169,211 Btu/h
9. Pressure drop for 1.25 gpm/circuit is 6.25 ft., water using Product Performance Data & Selection
on page5 for 40% ethylene glycol and T
find correction factor for the pressure drop for 20% ethylene glycol and T
= 115°F. Use Figure 2.2 on the previous page to
f,avg
= 120° F.
f,avg
Therefore, the pressure drop will be 6.259 * 0.93 = 5.8 ft., water.
10. Using Electrical Specifications on the previous page and Drycooler Model D0N*150 with a 460
VAC, 3-phase, 60 Hz motor, the electrical requirements will be FLA = 31 amps, WSA = 32 amps
and OPD = 35 amps.
Vertiv | Liebert® 10-fan Drycooler User Manual | 12
3 INSTALLATION
NOTE: Follow all unit dimensional drawings carefully. Determine whether any building alterations are
required to run piping and wiring. Also refer to the submittal engineering dimensional drawings.
3.1 Location Considerations
The drycooler should be located for maximum security and maintenance accessibility. Avoid ground level
sites with public access or areas which contribute to heavy snow or ice accumulations. To assure an
adequate air supply, it is recommended that drycoolers be located in a clean air area, away from loose dirt
and foreign matter that may clog the coil. In addition, drycoolers must not be located in the vicinity of
steam, hot air, or fume exhausts.
The unit may be mounted either at ground level or on a roof, given proper structural support and
following a review of local codes. Pit installations are not recommended. Air re-circulation will severely
affect unit and/or system performance. For these same reasons, units should not be installed closer than
72" (1829 mm) from a wall. This clearance should be increased to 96" (2438mm) in corner wall situations.
In multiple unit installations, units should not be installed closer than 72" (1829 mm) end to end or 96"
(2438 mm) side to side. For further details, see the following figure.
Vertiv | Liebert® 10-fan Drycooler User Manual | 13
Figure 3.1 Clearance considerations
Vertiv | Liebert® 10-fan Drycooler User Manual | 14
3.2 Site Preparation
Drycoolers should be installed in a level position to assure proper venting and drainage. This space should
have all services (electrical, drain, water) in close proximity. Also, the space should be level and free of
loose gravel, sand, flooring or roofing. For roof installation, mount drycoolers on steel supports in
accordance with local codes. To minimize sound and vibration transmission, mount steel supports across
load-bearing walls. For ground installations, a concrete pad is sufficient to carry the load. The base should
be at least 2 inches (51 mm) higher than the surrounding grade and 2 inches (51 mm) larger than the
dimensions of the unit base. The drycooler base has mounting holes for securing the drycooler once
installed. See the following figure.
Figure 3.2 Unit Dimensions
Vertiv | Liebert® 10-fan Drycooler User Manual | 15
Table 3.1 Drycooler Physical Data
Model #Model #
D*N*150* *068 10
D*N*150* *136 10
D*N*150* *272 10
DGN*120**068 10
DGN*120**1 36 10
DGN*120**272 10
No. of
Fans
CFM (CMH)
60Hz.
99030
(168250)
99030
(168250)
99030
(168250)
74160
(126000)
74160
(126000)
74160
(126000)
CFM (CMH)
50Hz.
82450
(140080)
82450
(140080)
82450
(140080)
N/A 92.8 (351) 5100 (2313)
N/A 92.8 (351) 5100 (2313)
N/A 92.8 (351) 5100 (2313)
Coil Internal
Vol. Gal (L)
92.8 (351) 5100 (2313)
92.8 (351) 5100 (2313)
92.8 (351) 5100 (2313)
Net Weight
Lb (kg)
3.3 Equipment Inspection Upon Delivery
When the Liebert® 10 Fan Drycooler™ arrives, inspect it for any visible or concealed damage. Do not
accept a damaged unit from the shipper!
NOTE: Any damage caused in transit must be reported immediately to the carrier and a damage claim
filed with a copy sent to your sales representative. Failure to do so may result in an inability to recover
costs for damage.
Before removing the drycooler from the truck/container, review the previous section, Site Preparation on
the previous page.
NOTICE
Risk of exposure to freezing temperatures. Can cause equipment damage.
If the drycooler is not installed immediately upon receipt, special storage precautions should be
taken. It is recommended that the unit be stored in a dry, heated place. Do not store the unit at
temperatures below 36°F (2.2°C). If the storage temperature is below 36°F (2.2°C), water vapor
can condense in the coil, freeze and cause permanent damage. Failure to store unit properly
will void the warranty.
3.4 Lifting and Handling the Drycooler
WARNING! Risk of unit very heavy unit tipping over. Can cause equipment damage, personal
injury and death.
Do not unload the drycooler with a forklift. The drycooler’s high center of gravity makes it a
tipping hazard. Further, tilted forks may damage the drycooler. Use chains and hooks when
removing the unit from the truck and when moving it between areas of equal height.
Riggers are required to lift the unit into place. Refer to Rigging Instructions belowFigure 3.3 below for lift
locations. Any time the unit is lifted, use slings or chains (with spreader bars) attached to the three lifting
eyes on either side of the unit base. Do not allow any part of the lifting apparatus to bear against the coil
fins. All lifting apparatus must also clear the fan guards on the top of the unit.
Vertiv | Liebert® 10-fan Drycooler User Manual | 16
3.4.1 Unit Weight
Dry weight of the unit is 5100 lb. (2313kg).
WARNING! Risk of unit very heavy unit tipping over. Can cause equipment damage, personal
injury and death.
To avoid a tilt hazard, adjustment may be necessary to locate the center of gravity before lifting
the unit.
Figure 3.3 Rigging Instructions
3.5 Piping Connections
See Figure 3.4 on page19 for a typical piping diagram. See Figure 3.5 on page20 piping locations.
Notice
Risk of overpressurization. Can cause equipment damage.
To avoid the possibility of burst pipes, it is necessary to install a relief valve in the system. This
valve may be obtained from your supplier as an option or may be sourced from another vendor.
Galvanized pipe must not be used in glycol systems. To help prevent piping failures, supply
and return lines must be supported such that their weight does not bear on the piping of the
unit or pumps.
NOTE: Units are shipped pressurized with a 30 psig dry air holding charge.
Vertiv | Liebert® 10-fan Drycooler User Manual | 17
It is recommended that manual service shutoff valves be installed at the supply and return connections to
each unit. This enables routine service and/or emergency isolation of the unit. In addition, multiple pump
packages require a check valve at the discharge of each pump to prevent backflow through the standby
pump(s).
Vertiv™ recommends installing filters/strainers in the supply line. These filters or strainers should be a
type that can be easily replaced or cleaned, with 16-20 mesh screen. These filters extend the service life of
the drycooler and the system’s pumps.
Vertiv™ recommends installing hose bibs at the lowest point of the system to facilitate filling.
Consideration of the minimum glycol temperature to be supplied from the drycooler will determine if the
glycol supply and return lines must be insulated toprevent condensation on the glycol lines in low
ambient conditions.
All fluid piping must comply with local codes. Care in sizing pipes will help reduce pumping power and
operating costs.
3.5.1 Expansion Tanks, Fluid Relief Valves and Other Devices
An expansion tank must be provided for expansion and contraction of the fluid due to temperature
change in this closed system. Vents are required at system high points to vent trapped air when filling the
system. A relief valve is also a necessary piping component.
Depending on the complexity of the system, various other devices may be specified. Pressure gauges, flow
switches, automatic air separator, tempering valves, standby pumps and sensors for electrical controls are
just a few of these devices.
NOTICE
Risk of burst pipes and leaking water from freezing temperatures. Can cause equipment and
building damage.
Immediately following the use of water for leak testing or system cleaning, charge the tested
system with the proper percentage of glycol and water for the coldest design ambient
expected. Complete system drain-down cannot be ensured, and damage to the system could
result from freezing of residual water.
Vertiv | Liebert® 10-fan Drycooler User Manual | 18
Figure 3.4 Typical piping diagram
Vertiv | Liebert® 10-fan Drycooler User Manual | 19
Figure 3.5 Piping dimensions
Vertiv | Liebert® 10-fan Drycooler User Manual | 20
Table 3.2 Piping, drycoolers
Model #. No. Fans
D*N*150* *068 10 68 2 2 2.625" (66.7mm) 2.625" (66.7mm)
D*N*150* *136 10 136 2 2 4.125'' (104.8mm) 4.125'' (104 .8mm)
D*N*150* *272 10 272 2 2 4.125'' (104 .8mm) 4.125'' (104.8mm)
DGN*120**068 10 68 2 2 2.625" (66.7mm) 2.625" ( 66.7mm)
DGN*120**1 36 10 136 2 2 4.125'' (1 04.8mm) 4.125'' (104.8mm)
DGN*120**272 10 272 2 2 4.125'' (1 04.8mm) 4.125'' (104 .8mm)
No. of
Internal
Circuits
No. of
Inlets
No. of
Outlets
Connection Sizes (ODS)
(A) Inlet (B) Outlet
Table 3.3 Piping specifications
Model
D0N*150** 68
DGN*120** 272
*Cut off closed end of connection tube; connectcouplings and elbows as required.
No. of Internal
Circuits
No. of
Inlets (A)
2 2
No. of
Outlets (B)
Connection Sizes, Inlet
and Outlet OD (in.)*
2.625
4.125
Coil Internal
Volume, Gal. (l)
92.8 (351)DTN*1 50** 1 36
Table 3.4 Volume in Standard Type L Copper Piping
Diameter (in.) Volume
Outside Inside gal/ft l/m
1-3/8 1.265 0.065
1-5/8 1.505 0.092 1.15
2-1/8 1.985 0.161 2.00
2-5/8 2.465 0.248 3.08
3-1/ 8 2.945 0.354 4.40
3-5/8 3.425 0.479 5.95
4-1/8 3.905 0.622 7.73
Vertiv | Liebert® 10-fan Drycooler User Manual| 21
3.6 Filling Instructions
3.6.1 Preparing the System for Filling
It is important to remove any dirt, oil or metal filings that may contaminate the cooling system piping in
order to prevent contamination of the fresh glycol solution and fouling of the drycooler piping. The
system should be flushed thoroughly using a mild cleaning solution or high-quality water and then
completely drained before charging with glycol. Cleaning new systems is just as important as cleaning old
ones. New systems can be coated with oil or a protective film; dirt and scale are also common. Any residual
contaminants could adversely affect the heat transfer stability and performance of your system. In many
cases, in both old and new systems, special cleaners are needed to remove scale, rust and hydrocarbon
foulants from pipes, manifolds and passages. Clean heat transfer surfaces are important in maintaining
the integrity of the heating/cooling system. For more information on cleaners and degreasers, contact
your sales representative. Follow the manufacturer’s instructions when using these products.
Calculate the internal volume of the system as closely as possible. The Liebert® 10 Fan Drycooler™ volume,
not including the load or field-supplied piping, is 92.8 gallons (351 l). Use Volume in Standard Type L
Copper Piping on the previous page for field-installed piping volumes.
3.6.2 Glycol Solutions
NOTE: Glycol solutions should be considered for the protection of the coil. When glycol solutions are
not used, damage can occur either from freezing or from corrosion from water.
When considering the use of any glycol products in a particular application, you should review the latest
Material Safety Data Sheets and ensure that the use you intend can be accomplished safely. For Material
Safety Data Sheets and other product safety information, contact the supplier nearest you. Before
handling any other products mentioned in the text, you should obtain available product safety
information and take necessary steps to ensure safety of use.
NOTICE
Risk of improper handling of glycol. Can cause environmental damage.
When mishandled, glycol products pose a threat to the environment. Before using any glycol
products, review the latest Material Safety Data Sheets and ensure that you can use the
product safely. Glycol manufacturers request that the customer read, understand and comply
with the information on the product packaging and in the current Material Safety Data Sheets.
Make this information available to anyone responsible for operation, maintenance and repair of
the drycooler and related equipment.
NOTICE
Risk of using improper glycol. Can cause equipment damage.
Automotive antifreeze is unacceptable and must NOT be used.
No chemical should be used as or in a food, drug, medical device, or cosmetic, or in a product or process in
which it may contact a food, drug, medical device, or cosmetic until the user has determined the suitability
and legality of the use. Since government regulations and use conditions are subject to change, it is the
user's responsibility to determine that this information is appropriate and suitable under current,
applicable laws and regulations.
Vertiv | Liebert® 10-fan Drycooler User Manual| 22
Typical inhibited formula ethylene glycol and propylene glycol manufacturers and suppliers are Union
Carbide (Ucartherm) and Dow Chemical (Dowtherm SR-1, Dowfrost). These glycols are supplied with
corrosion inhibitors and do not contain a silicone anti-leak formula. Commercial ethylene glycol, when
pure, is generally less corrosive to the common metals of construction than water itself. Aqueous solutions
of these glycols, however, assume the corrosivity of the water from which they are prepared and may
become increasingly corrosive with use when not properly inhibited.
There are two basic types of additives:
• Corrosion inhibitors and
• Environmental stabilizers
The corrosion inhibitors function by forming a surface barrier that protects the metals from attack.
Environmental stabilizers, while not corrosion inhibitors in the strictest sense of the word, decrease
corrosion by stabilizing or favorably altering the overall environment. An alkaline buffer, such as borax, is a
simple example of an environmental stabilizer, since its prime purpose is to maintain an alkaline condition
(pH above 7).
The percentage of glycol to water must be determined by using the lowest design outdoor temperature in
which the system is operating. The following table indicates the solution freeze point at several c
concentration levels of ethylene glycol. Propylene glycol concentrations should be 1% higher than
ethylene glycol table values to find the freeze point. For example, 41% propylene glycol freezes at -10°F.
Table 3.5 Ethylene glycol concentrations
% Glycol by Volume 0* 10 20 30 40 50
Freezing Point °F (°C) 32 ( 0) 25 (-3.9) 1 6 (-8.9) 5 (-15.0) -10 (- 23.3) -32 ( -35.5)
Apparent Specific Gravity
@ 50°F ( 10°C)
* A minimal amount of glycol should be considered for inhibitive coil protection.
1 1,014 1.028 1,04 2 1,057 1.071
Notice
Risk of poor water quality. Can cause equipment damage.
The quality of water used for dilution must be considered because water may contain corrosive
elements that reduce the effectiveness of the inhibited formulation. Surface water that is
classified as soft (low in chloride and sulfate ion content—less than 100 ppm each) should be
used.
3.6.3 Filling the System
Vertiv™ recommends installing hose bibs at the lowest point of the system.
When filling a glycol system, keep air to a minimum. Air in glycol turns to foam and is difficult and timeconsuming to remove. (Anti-foam additives are available and may be considered.)
Open all operating systems to the loop. With the top vent(s) open, fill the system from the bottom of the
loop. This will allow the glycol to push the air out of the top of the system, minimizing trapped air. Fill to
approximately 80% of calculated capacity. Fill slowly from this point, checking fluid levels until full.
NOTE: For glycol solution preparation and periodic testing, follow manufacturer’s recommendations.
Do not mix products of different manufacturers.
Vertiv | Liebert® 10-fan Drycooler User Manual| 23
3.7 Electrical Connections
Each unit is shipped from the factory with all internal unit wiring completed. Refer to the electrical
schematic when making connections. All wiring must be done in accordance with the National Electric
Code and all local and state codes.
WARNING! Risk of electric shock. Can cause injury or death. Disconnect all local and remote
electric power supplies before working within the unit.
The fans may start unexpectedly. The line side of the factory disconnect remains energized
when the disconnect is Off. Use a voltmeter to confirm that the electric power is turned Off
before making any electrical connections.
3.7.1 Line Voltage
Drycooler rated voltage should be verified with available power supply upon receipt of unit but before
installation. Refer to the unit electrical schematic and serial tag for specific electrical requirements. All
wiring must be done in accordance with the National Electric Code as well as all local and state codes.
CAUTION: Risk of using improper wire. Can cause equipment damage or a safety hazard from
overheated wire and/or connections.
Size the system electrical service for the total of all drycoolers and ancillary components
FLA/WSA/OPD. Unit-specific wiring diagrams are provided on each unit. Use copper wiring
only. Make sure that all connections are tight.
Line voltage electrical service is required for all drycoolers at the location of the drycooler. The power
supply does not necessarily have to be the same voltage supply as required by the indoor unit for which
the drycooler operates. This power source may be 208, 230, 460 or 575V 60Hz; or 380/415V 50Hz. A unit
disconnect is standard. However, a site disconnect may be required per local code to isolate the unit for
maintenance. Route the supply power to the site disconnect switch and then to the unit. Route the
conduit through the hole provided in the cabinet. Connect earth ground to lug provided near terminal
board. For units with multi-voltage transformer, the transformer connections should match (change if
necessary) the local power supply. See the following figure.
Vertiv | Liebert® 10-fan Drycooler User Manual| 24
Figure 3.6 Electrical Field Connections
3.7.2 Low Voltage Control Wiring
A control interlock between the drycooler and the heat load(s) will require 24V Class 2 copper wiring for
remote On/Off sequencing of the drycooler with the load. Refer to the electrical schematic for wiring to
Terminals 70 & 71. See the following figure for typical low-volt system wiring.
If the current sensing relay option is provided, 24V Class 2 wiring will be necessary to make the
connections to monitor motor operation.
NOTE: Make sure all electrical connections are tight.
Vertiv | Liebert® 10-fan Drycooler User Manual| 25
Figure 3.7 Typical Low Volt Wiring Diagram
3.8 Checklist for Completing Installation
NOTE: After installation, proceed with the following list to verify that the installation is complete.
Complete and return the Warranty Inspection Check Sheet which is shipped with the unit and return to
the address indicated on the check sheet.
1. Proper clearances for service access have been maintained around the equipment.
2. Equipment is level and mounting fasteners are tight.
3. Piping completed to coolant loop.
4. All piping connections are tight as well as secured and isolated for vibration reduction.
5. All piping connections inspected for leaks during initial operation.
6. Line voltage to power wiring matches equipment nameplate.
7. Power wiring connections completed to disconnect switch, including earth ground.
8. Power line circuit breakers or fuses have proper ratings for equipment installed.
9. Control wiring connections completed to heat loads/evaporator(s), including wiring to optional
controls.
10. All wiring connections are tight.
11. Foreign materials have been removed from in and around all equipment installed (shipping
materials, construction materials, tools, etc.).
Vertiv | Liebert® 10-fan Drycooler User Manual| 26
12. Fans rotate freely and in correct direction without unusual noise and discharge the air
upwards.
13. Glycol has been added to the drycooler to prevent freeze damage.
Vertiv | Liebert® 10-fan Drycooler User Manual| 27
This page intentionally left blank.
Vertiv | Liebert® 10-fan Drycooler User Manual| 28
4 OPERATION
WARNING! Risk of electric shock. Can cause injury or death. Disconnect all local and remote
electric power supplies before working within the unit.
The fans may start unexpectedly. Disconnect the power supply before working on the unit.
Line side of factory disconnect remains energized when the disconnect is Off. Use a voltmeter
to make sure power is turned off before checking any electrical connections or functions.
4.1 Initial Startup Procedure
Refer to Checklist for Completing Installation on page26 and verify that all installation items have been
completed prior to proceeding.
Turn the unit ON. Check the fans for proper rotation (air discharging up). Check the pumps for proper
rotation.
Notice
Risk of overheated pumps. Can cause equipment damage.
Do not run pumps without fluid in the system. Pump seals require fluid to keep them cool;
running them for any amount of time will damage the seals, which may cause a failure.
4.1.1 Control Setpoints
The fluid temperature controls should be set according to the following table for standard cooling only or
free-cooling GLYCOOL applications. See the following figure.
Table 4.1 Control Settings
Heat Rejection
Method
Standard
Free-Cooling
(GL YCOOL)
Fluid
Temperature
Control
1TAS 68°F ( 20°C) -
1STG - 5°F (2.8°C) 73°F (22.8°C) 85°F ( 29.4°C)
2STG - 10°F (5.6°C) 78°F (25.6°C) 90°F (32.2°C)
1TAS 42°F (5.6°C) -
1STG - 2°F (1.1°C) 44° F (6.7°C) 52°F (11.1°C)
2STG - 4°F (2.2°C) 46°F (7.8°C) 54° F (12.2°C)
Setpoint Offset Differential Open Close
68°F (20°C) 80°F (26.7°C)
12°F (6.7°C)
42°F ( 5.6°C) 50°F (10°C)
8°F ( 4.4°C)
Vertiv | Liebert® 10-fan Drycooler User Manual| 29
Figure 4.1 Fluid Temperature Controls
4.1.2 Current-Sensing Relays
If supplied, be sure that the current-sensing relays (CSR) are wired as per the wiring schematic using 24V
Class 2 copper wiring. When the thermostat closes, a 24-volt signal will be sent to the relevant terminals of
the CSR. When this occurs, a time delay starts, allowing the amperage to be sensed on the load side of the
contactors.
First, set selection under amperage on selector switch, then start all fans. Set the trip delay for 50%.
Disconnect one of the load side wires from a fan being monitored by the control. Turn the potentiometer
until the LED is lit. Reconnect the fan wire. Check and repeat for the other circuits. Be sure to set the fluid
temperature controls as per the specifications, as illustrated within the unit electrical schematic (supplied
with the unit), or refer to Control Setpoints on the previous page. See the following figure or current
sensing relay layout.
Vertiv | Liebert® 10-fan Drycooler User Manual| 30
Figure 4.2 Current Sensing Relays
4.1.3 Cold Weather Operation
Glycol solution should be used for operation of units located where outdoor ambients will include
temperatures at or below freezing. Refer to the installation sections referring to Piping Connections on
page17 and Glycol Solutions on page22 for further details.
Vertiv | Liebert® 10-fan Drycooler User Manual| 31
This page intentionally left blank.
Vertiv | Liebert® 10-fan Drycooler User Manual| 32
5 SYSTEM MAINTENANCE
WARNING! Risk of electric shock. Can cause injury or death. Disconnect all local and remote
electric power supplies before working within the unit.
The fans may start unexpectedly. Disconnect power supply before working on unit. Line side of
factory disconnect remains energized when disconnect is off. Use a voltmeter to make sure
power is turned off before checking any electrical connections or functions
5.1 General Procedures
NOTE: When ordering replacement parts for equipment, it is necessary to specify the unit’s model
number, serial number and voltage. Record those numbers in the spaces below.
Model Number ___________________
Serial Number ___________________
Voltage __________________________
Periodic attention is necessary for continued satisfactory operation of your unit. A daily inspection of the
system should be made to verify that the unit is performing satisfactorily. It is suggested that a daily log
be maintained recording inlet and outlet coolant temperature, ambient temperature and the coolant
pressure gauge readings. The coolant sight glass should be checked and the fans checked for unusual
sounds which may indicate wear or future trouble.
Monthly inspections should include removal and cleaning of strainer, and cleaning and inspection of coil.
The coil can be cleaned with water, compressed air or steam as required. During monthly inspections, it is
also wise to check the coolant to assure sufficient glycol in the mixture to prevent freeze-up. Each fan
motor amp draw should be checked. If performance or operation problems are also detected, refer to
Troubleshooting on page37 for required action. Use copies of the Maintenance Inspection Checklist on
page35.
Restricted air flow through the drycooler coil will reduce the operating efficiency of the unit and can
result in high fluid temperatures and loss of cooling. Clean the drycooler coil of all debris that will inhibit air
flow. This can be done with compressed air or a commercial coil cleaner. Check for bent or damaged coil
fins and repair as necessary. In winter, do not permit snow to accumulate around the sides or underneath
the drycooler.
Check all fluid lines and capillaries for vibration isolation. Support as necessary. Visually inspect all fluid
lines for signs of fluid leaks.
Inspect the motor/fan assemblies to insure bearings are free and the motor is secure within the mount.
The glycol level in drycooler systems must be periodically checked. At the high point of the system, check
for:
• Positive pressure
• Air to be vented
• An unclogged expansion tank
• Proper concentration of inhibitors and antifreeze
Vertiv | Liebert® 10-fan Drycooler User Manual| 33
The first three checks may give an indication of leaks in the system.
5.2 Special Procedures
5.2.1 Drycooler Cleaning
Keeping the outdoor drycooler coils clean is an important factor in maintaining peak efficiency, reliability
and long life of the equipment. It is much easier to keep up on frequent cleanings rather than wait until
heavy build up has occurred which may create head pressure problems with the evaporator units.
When to Clean
Normal conditions typically dictate cleaning twice a year, spring and fall. On-site or area conditions such
as cottonwood trees, construction, etc., can increase cleaning frequency. On your standard bimonthly or
quarterly preventive maintenance schedule, a visual inspection of the coil is recommended to monitor
conditions.
What to Use
The best overall drycooler coil cleaner to use is plain water. If the coil has been maintained and cleaned at
regular intervals, water is sufficient to remove dirt and debris from the fins. Heavy buildup on the exterior
of the fins can be removed with a brush. Water pressure from a garden hose and sprayer usually works
well. If a pressure washer is used, make sure the equipment is set to a lower pressure setting and that the
nozzle is set to the fan spray, not stream. Otherwise, damage to the fins could result. If a cleaner is
required, Vertiv™ recommends using a non-acidic type cleaner. Acid-type cleaners can be aggressive to
the coil fins as well as surrounding areas. Many sites do not allow the use of acidic cleaners for
environmental reasons.
How to Clean
The best way to clean coils is from the inside out. This requires removing the coil guards or grilles (if
provided), the fan guards and blades to access the coil surface. The sprayer can then be worked across
the coil pushing the dirt and debris out. Although this does extend the time involved, the results are well
worth it. This method should be used at least once a year. Spraying the coil from the outside repeatedly
can push a majority of the dirt to the inner section of the fins and continue to restrict air flow. Keep in
mind you may not have the luxury of shutting the unit(s) down for an extended time. A scheduled
shutdown with the operator may be in order. If using a cleaner along with the spraying process, follow
recommended manufacturer instructions and be sure to rinse the coil thoroughly. Any residue left on the
coil can act as a magnet to dirt.
Vertiv | Liebert® 10-fan Drycooler User Manual| 34
5.2.2 Maintenance Inspection Checklist
Date:____________________________________ Prepared By:____________________________________
Model #:_________________________________ Serial Number:__________________________________
NOTE: Regular inspections are necessary to assure proper cleanliness of the cooling fins. Should
inspection reveal dirt or corrosion, appropriate cleaning should be performed.
Monthly Semiannually
Drycooler Drycooler
_____1. Coil surfaces free of debris _____1. Complete all monthly items
_____2. Fans/grilles free of debris _____2. Piping in good condition
_____3. Fan motors securely mounted _____3. Piping secure
_____4. Motor bearings in good condition _____4. Wash coil as needed
_____5. No water/glycol leaks Pump Package
Pump Package _____ 1. Complete all monthly items
_____1. Pump rotation _____2. Test changeover operation
_____2. Pump securely mounted _____3. Pump #1 amp draw __________
_____3. No water/glycol leaks Pump #1 amp draw __________
_____4. No abnormal noises Pump #1 amp draw __________
_____4. Glycol level and general condition
_____5. Glycol freeze point ____°F and pH ____
_____6. Check all electrical connect
_____7. Check contactors for pitting
Drycooler Electric Panel
_____1. Check all electrical connections
_____2. Check all electrical connections
_____3. Operational sequence/setpoints
Fan Motors
_____1. Motor #1 amp draw __________ amps
_____2. Motor #2 amp draw __________ amps
_____3. Motor #3 amp draw __________ amps
_____4. Motor #4 amp draw __________ amps
_____5. Motor #5 amp draw __________ amps
_____6. Motor #6 amp draw __________ amps
_____7. Motor #7 amp draw __________ amps
_____8. Motor #8 amp draw __________ amps
_____9. Motor #9 amp draw __________ amps
____10. Motor #10 amp draw __________ amps
Vertiv | Liebert® 10-fan Drycooler User Manual| 35
NOTES:
Signature: ______________________________________________________________________________
Make photocopies of this form for your records.
Vertiv | Liebert® 10-fan Drycooler User Manual| 36
6 TROUBLESHOOTING
Symptom Possible Cause C heck Or Remedy
No main power Check L1, L 2 and L 3 for r ated voltage
Disconnect switch open Close disconnect switch
Blown fuse or circuit breaker
tripped
Unit will not operate
Unit runs, butmotor protector
keeps tripping
Outlet temperature from unittoo
high
Liquidsquirts from surge tank fill
cap when pump is turned off
Pump suddenly stops pumping Clogged strainer or impeller Clean outdebris
Pumping suddenly slows Clogged impeller, diffuser or line Cleanoutdebris and use s trainer
Excessive leakage around the
pumps haft while operating
Pump performance poor
Pump has noisy operation
Pump discharge press ure too
high
Control fuse or circuitbreaker
tripped
Improperly wired Check wiring diagram
No outputvoltage from
transformer
Motor protector defective Replace protector
Motor protector too small Check amp. draw
Fan or pumpmotor has shorted
winding
Low or unbalanced voltage Determine r eason and correct
Low or no coolant flow
Ambientair temperature higher
thandesign
Heat load higher thandesign
Throttling valve improperly Res et valve to proper differential pres sure
Air in system Ventall highpoints, repeat as necessar y. Check liquidlevel in surge tank.
Worn seal or packing Replace seal or packing
Worn impeller or seal Replace withnew impeller or s eal
Suctionlifttoo high Relocate pumpcloser to supply
Motor not up to speed; low
voltage
Worn bearings Replace pump
Worn motor bearings Replace pump
Low discharge head Throttle discharge -- improve conditions
Debris lodgedin impeller Remove cover and clean out
Cavitating pumps Adjust s ystem pres sures
Throttling valve improperly set Reset valve to proper differential pressure
Valve closed in circuit Open all valves downstream of unit
Strainer cloggedor dirty Remove strainer plug and clean
Check fuses or circuitbreaker
Check for 24 VAC. If no voltage, check for s hort. Replace fuse or res et circuit
breaker.
Check for 24 VAC. If no voltage, check primary voltage
Repair motor
See Pump will not operate or no coolant flow on the next page entry in this
table
Correct possible hot air discharge to fans from another source
Check for misapplication, need larger cooler. Correct possible additionalheat
loadbeing added to cooling circuit.
Larger lead wires may be required. Check for proper line voltage,±10%
Vertiv | Liebert® 10-fan Drycooler User Manual| 37
Symptom Possible Cause C heck Or Remedy
No power to pump motor See Unit will notoperate on the previous page in this table
Low coolant level Check coolantlevel
Tubes plugged in cooling coil Flush coil withreputable cleaner
Pump will notoperate or no
coolantflow
Valve closed downstream of
cooling unit
Strainer cloggedor dirty Remove strainer plug and clean
Pump cavitating ( err atic gauge
operation)
Open all valves
Possibility of air in lines. Bleed all components. Check surge tank to pump inlet
connection. Check for pipingrestrictions.
Vertiv | Liebert® 10-fan Drycooler User Manual| 38
VertivCo.com | Vertiv Headquarters, 1050 Dearborn Drive, Columbus, OH, 43085, USA
© 2017 Vertiv Co. Allrights reserved. Vertiv and the Vertivlogo are trademarks or registered trademarks of VertivCo. All other names and logos referred to
are trade names, trademarks or registered trademarks of their respective owners. While every precaution has been taken to ensure accuracy and
completeness herein, Vertiv Co. assumes no responsibility, and disclaims allliability, for damages resulting from use of this information or for any errors or
omissions. Spec ifications are subject to change without notice.
SL-10061_REV3_10-17/590-1691-501A
Loading...