Vertiv DataMate User Manual

Liebert®

DataMate™

Installer/User Guide

1.5-ton to 3-ton Capacity, 50Hz and 60Hz

The information contained in this document is subject to change without notice
and may not be suitable for all applications. While every precaution has been
taken to ensure the accuracy and completeness of this document, Vertiv
assumes no responsibility and disclaims all liability for damages resulting from
use of this information or for any errors or omissions. Refer to other local
practices or building codes as applicable for the correct methods, tools, and
materials to be used in performing procedures not specifically described in this
document.

The products covered by this instruction manual are manufactured and/or sold
by Vertiv. This document is the property of Vertiv and contains confidential
and proprietary information owned by Vertiv. Any copying, use or disclosure of
it without the written permission of Vertiv is strictly prohibited.

Names of companies and products are trademarks or registered trademarks of
the respective companies. Any questions regarding usage of trademark names
should be directed to the original manufacturer.

Technical Support Site

If you encounter any installation or operational issues with your product, check the pertinent section of this
manual to see if the issue can be resolved by following outlined procedures.
Visit https://www.Vertiv.com/en-us/support/ for additional assistance.

Vertiv | Liebert® DataMate™ Installer/User Guide

TABLE OF CONTENTS

1 Important Safety Instructions 1

1.1 AHRICertified 6

1.2 Agency Listed 7

2 Nomenclature 9

2.1 Nomenclature for Evaporator and Chilled Water Units 9

2.2 Nomenclature for Condensing Units 10

2.2.1 Outdoor Prop Fan Condensing Units for Air Cooled Systems 10

2.2.2 Indoor Condensing Units for Air Cooled Systems 11

2.2.3 Close Coupled Condensing Unit for Water/Glycol CooledSystems 12

2.2.4 Remote, Indoor Water/Glycol Cooled Condensing Units 13

2.3 System Configurations 14

3 Site Preparation and Equipment Handling 17

3.1 Planning Dimensions 17

3.2 Room Preparation 17

3.3 Application Limits 17

3.4 Location Considerations 18

3.4.1 Location Considerations for Evaporator, Indoor CondensingandChilled WaterUnits 19

3.4.2 Location Considerations for an Outdoor Condensing Unit 20

3.5 Unit Weights 21

3.6 Equipment Inspection and Handling 21

4 Installation 23

4.1 Installing Wall Mounted EvaporatorsandChilled Water Units 23

4.1.1 Changing Air Flow Direction 23

4.2 Installing Outdoor Condensing Unit forAir CooledSplit Systems 23

4.3 Installing Ceiling Mounted Condensing Units 23

4.3.1 Installing Suspension Rods andMounting Ceiling Units 24

4.3.2 Guidelines for Ducted Systems 26

4.4 Close Coupled Installations forIntegralWater/Glycol CondensingUnits 27

4.4.1 Connecting the Close Coupled Refrigerant Circuit 33

4.4.2 Connecting the Close Coupled Electrical Wiring 35

4.4.3 Final Installation Steps for Close Coupled Units 36

5 Piping and Refrigerant Requirements 37

5.1 Fluid Piping Required 38

5.1.1 Evaporator Drain Line Installation Requirements 38

5.1.2 Humidifier Drain Line Installation Requirements 38

5.1.3 Condensate Drain Pump Kit 38

5.1.4 Water Supply Line to the Humidifier 39

5.1.5 Chilled Water Loop Piping 39

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5.1.6 Water/Glycol Loop Piping 40

5.2 Refrigerant Piping 42

5.2.1 Piping when Condensing Unit is Above or Below Evaporator 43

5.2.2 Refrigerant Line Sizes and Equivalent Lengths 44

5.3 Refrigerant Charge Requirements 45

5.3.1 Field Fabricated Refrigeration Piping 46

5.3.2 Evacuation and Leak Testing Air Cooled Systems 46

5.3.3 Charging Air Cooled Systems 49

5.3.4 Field Charge Verification forAir Cooled Systems 49

5.3.5 Documenting Refrigerant Charge on Air Cooled Units 50

5.3.6 Evacuation and Leak Testing Water/Glycol Cooled Systems 50

5.3.7 Charging Water/Glycol Cooled Systems 52

5.3.8 Optimizing Refrigerant Charge on Water/Glycol Units 53

5.3.9 Documenting Refrigerant Charge on Water/Glycol-cooled Units 53

6 Electrical Connection Requirements 55

6.1 Input Power Connection Requirements 56

6.2 Control Wiring Connection Requirements 57

6.2.1 Wall Box Controller Control Connections 57

6.2.2 Split System Condensing Unit Control Connections 57

6.2.3 Water/Glycol Cooled Unit Control Connections 57

6.2.4 Additional Control Connections 57

7 Checklist for Completed Installation 59

8 Initial Start-up Checks andCommissioningProcedure forWarrantyInspection 61

9 Microprocessor Control 63

9.1 Controller Operation 63

9.1.1 Powering On/Off with Wall Mounted Display 64

9.1.2 Silencing an Audible Alarm 64

9.2 Main Menu <MENU> 64

9.2.1 Editing Setpoints 67

9.2.2 Viewing Unit Status 67

9.2.3 Viewing Active Alarms 68

9.2.4 Setting Controller Time 68

9.2.5 Setting Controller Date 68

9.2.6 Programming Setback 68

9.2.7 Editing Setup Operation 69

9.2.8 Changing Setpoint and Setup Passwords 71

9.2.9 Calibrating Sensors and Setting Sensor Response Delay 71

9.2.10 Enabling/Disabling Alarms 72

9.2.11 Setting Alarm Delays 72

9.2.12 Activating the Common Alarm Relay 73

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9.2.13 Configuring Custom Alarms 74

9.2.14 Customizing Alarm Message Text 74

9.2.15 LCD Display Contrast 74

9.2.16 Non-volatile Memory 74

9.2.17 Equipment Options DIP Switches 75

9.3 Running Diagnostics 76

9.3.1 Showing Test Inputs 76

9.3.2 Testing Outputs 76

9.3.3 Testing the Microcontroller 77

9.4 System Control and Performance 80

9.4.1 Temperature Control 80

9.4.2 Cooling/Heating Required 80

9.4.3 Electric Reheat 80

9.4.4 Humidity Control 80

9.4.5 Load Control 81

9.4.6 Monitoring 81

9.5 Alarm Notification, Acknowledgment, and Descriptions 81

9.5.1 Custom Alarms 81

9.5.2 High Head Pressure Alarm 82

9.5.3 Humidity Level Alarms 82

9.5.4 Temperature Level Alarms 83

9.5.5 Humidifier Problem Alarm 83

9.5.6 Loss of Power Alarm 83

9.5.7 Short Cycle Alarm 83

10 Maintenance 85

10.1 System Testing 86

10.1.1 Environmental Control Function Tests 86

10.1.2 Cooling Test 86

10.1.3 Heating Test 86

10.1.4 Humidification Test 86

10.1.5 Dehumidification Test 86

10.1.6 Remote Shutdown Test 86

10.2 Filter Maintenance 87

10.3 Electric Panel Maintenance 87

10.4 Direct Drive Blower Package Maintenance 87

10.4.1 Fan Impeller and Motor Bearing Maintenance 87

10.4.2 Air Distribution Inspection 87

10.5 Electric Reheat Maintenance 87

10.6 Refrigeration System Maintenance 87

10.6.1 Refrigeration Suction Pressure 87

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10.6.2 Refrigeration Discharge Pressure 87

10.6.3 Thermostatic Expansion Valve (TXV) Maintenance 88

10.6.4 Air Cooled Condensing Unit Maintenance 88

10.6.5 Hot Gas Bypass Operation and Maintenance 88

10.6.6 Water/Glycol Condenser Maintenance 90

10.6.7 Regulating Valve Maintenance (Water/Glycol Cooled Condensers Only) 90

10.6.8 Glycol Solution Maintenance 90

10.7 Compressor Maintenance 91

10.7.1 Mechanical Failure of the Compressor 91

10.7.2 Electrical Failure of the Compressor 91

10.7.3 Replacement Compressors 92

10.7.4 Replacing a Failed Compressor 92

10.8 Steam Generating Humidifier Maintenance 92

10.8.1 Operating the Humidifier 93

10.8.2 Replacing the Canister 94

10.8.3 Circuit Board Adjustments 95

11 Preventive Maintenance Checklist 97

12 Troubleshooting 101

Appendices 105

Appendix A: Technical Support and Contacts 105

Appendix B: Submittal Drawings 107

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1 IMPORTANT SAFETY INSTRUCTIONS

SAVE THESE INSTRUCTIONS

This manual contains important safety instructions that should be followed during the installation and maintenance of the
Liebert®DataMate. Read this manual thoroughly before attempting to install or operate this unit.

Only qualified personnel should move, install or service this equipment.

Adhere to all warnings, cautions, notices and installation, operating and safety instructions on the unit and in this manual.
Follow all installation, operation and maintenance instructions and all applicable national and local building, electrical and
plumbing codes.

WARNING! Arc flash and electric shock hazard. Open all local and remote electric power supply disconnect
switches, verify with a voltmeter that power is Off and wear appropriate, OSHA approved personal protective
equipment (PPE) per NFPA 70E before working within the 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 Liebert® controller does
not isolate power from the unit, even in the Unit Off mode. Some internal components require and receive
power even during the Unit Off mode of the controller. 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 electric shock. Can cause equipment damage, injury, or death. Open all local and remote
electric power supply disconnect switches and verify with a voltmeter that power is off before working within
any electric connection enclosures. Service and maintenance work must be performed only by properly
trained and qualified personnel and in accordance with applicable regulations and manufacturers’
specifications. Opening or removing the covers to any equipment may expose personnel to lethal voltages
within the unit even when it is apparently not operating and the input wiring is disconnected from the
electrical source.

WARNING! Risk of over-pressurization of the refrigeration system. Can cause piping rupture, explosive
discharge of high pressure refrigerant, loss of refrigerant, environmental pollution, equipment damage,
injury, or death. This unit contains fluids and gases under high pressure. Use extreme caution when
charging the refrigerant system. Do not pressurize the system higher than the design pressure marked on
the unit's nameplate. Relieve pressure before cutting into or making connections/disconnections to the
piping system. Local building or plumbing codes may require installing a pressure relief device in the
system.

Consult local building and plumbing codes for installation requirements of additional pressure relief devices
when isolation valves are field installed. Do not isolate any refrigerant circuits from over-pressurization
protection. The PFH and MCD condensing units include a factory installed pressure relief valve mounted on
top of the receiver. The valve is rated for a maximum working pressure of 475 psig.

1 Im portant Safety Instructions

1

WARNING! Risk of contact with high speed, rotating fan blades. Can cause injury or death. Open all local and
remote electric power supply disconnect switches, verify with a voltmeter that power is off, and verify that all
fan blades have stopped rotating before working in the unit cabinet.

WARNING! Risk of electric shock. Can cause serious injury or death. The microprocessor does not isolate
power from the unit, even in the Unit Off mode. Some internal components require and receive power even
during the Unit Off mode of the control. Open all local and remote electric power disconnect switches and
verify with a voltmeter that power is Off before working on any component of the system.

WARNING! Risk of improper wiring, piping, moving, lifting and handling. Can cause equipment damage,
serious injury or death. Installation and service of this equipment should be done only by qualified personnel,
wearing appropriate, OSHA approved PPE, who have been specially trained in the installation of air
conditioning equipment.

WARNING! Risk of improper wire and loose electrical connections. Can cause overheated wire and electrical
connection terminals resulting in smoke, fire, equipment and building damage, injury or death. Use correctly
sized copper wire only and verify that all electrical connections are tight before turning power On. Check all
electrical connections periodically and tighten as necessary.

WARNING! Risk of unit falling off of the wall. Can cause building and equipment damage and serious injury. A
licensed professional structural engineer should evaluate the wall to determine if the unit may be safely
mounted on the wall and determine the type and size of fasteners required to support the weight of the unit
during all phases of operation because some vibration may occur during start, stop, and operation cycles.
The wall may need to be reinforced to support the maximum load of the unit. See Table 3.5 on page21, for
unit weights.

WARNING! Risk of ceiling collapse and heavy unit falling. Can cause building and equipment damage, serious
injury or death. If using a ceiling mounted condensing unit, verify that the supporting roof structure is
capable of supporting the weight of the unit(s) and the accessories. See the appropriate condensing unit
installer/user guide for the unit weights. Securely anchor the top ends of the suspension rods and verify that
all nuts are tight.

WARNING! Risk of smoke and fire. Can cause activation of fire suppression systems, building evacuation,
dispatching of fire/rescue equipment and personnel and catastrophic canister failure resulting in water
leaks, equipment damage, injury or death. Using a humidifier canister that has reached the end of it’s service
life can be extremely hazardous. If the canister cannot be replaced immediately at the end of life condition,
turn Off the power and water supply to the humidifier and remove the canister until a replacement canister
can be installed. Do not ignore humidifier problem alarms. Resetting humidifier without addressing cause
may result in fire or damage due to leaking water.

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CAUTION: Risk of excessive refrigerant line pressure. Can cause tubing and component rupture resulting in
equipment damage and personal injury. Do not close off any field installed refrigerant line isolation valve for
repairs unless a pressure relief valve is field installed in the line between the isolation valve and the check
valve. The pressure relief valve must be rated 5% to 10% higher than the system design pressure. An
increase in ambient temperature can cause the pressure of the isolated refrigerant to rise and exceed the
system design pressure rating (marked on the unit nameplate).

CAUTION: Risk of contact with sharp edges, splinters, and exposed fasteners. Can cause injury. Only
properly trained and qualified personnel wearing appropriate, OSHA approved PPE should attempt to move,
lift, remove packaging from or prepare the unit for installation.

CAUTION: Risk of contact with hot surfaces. Can cause injury. The compressor, refrigerant discharge lines,
fan motor, and some electrical components are extremely hot during unit operation. Allow sufficient time for
them to cool to a touch-safe temperature before working within the unit cabinet. Use extreme caution and
wear appropriate, OSHA approved PPE when working on or near hot components.

CAUTION: Risk of contact with hot surfaces. Can cause burn injury. The humidifier canister and steam
discharge lines are extremely hot during operation. Allow sufficient time for them to cool to a touch-safe
temperature before handling. Use extreme caution and wear appropriate, OSHA approved PPE when
performing maintenance on the humidifier.

NOTICE

CAUTION: Risk of contacting caustic substances. Can cause injury. Avoid touching or contacting the gas and
oils with exposed skin. Severe burns will result. Wear appropriate, OSHA approved PPE when handling
contaminated parts.

Risk of oil contamination with water. Can cause equipment damage.

Liebert®DataMateDX systems require the use of POE (polyolester) oil. POE oil absorbs water at a much faster
rate when exposed to air than previously used oils. Because water is the enemy of a reliable refrigeration
system, extreme care must be used when opening systems during installation or service. If water is absorbed
into the POE oil, it will not be easily removed and will not be removed through the normal evacuation process. If
the oil is too wet, it may require an oil change. POE oils also have a property that makes them act as a solvent
in a refrigeration system. Maintaining system cleanliness is extremely important because the oil will tend to
bring any foreign matter back to the compressor.

1 Im portant Safety Instructions

3

NOTICE

NOTICE

Risk of clogged or leaking drain lines and leaking water supply lines. Can cause equipment and building
damage.

This unit requires a water drain connection. Drain lines must be inspected at start-up and periodically, and
maintenance must be performed to ensure that drain water runs freely through the drain system and that lines
are clear and free of obstructions and in good condition with no visible sign of damage or leaks. This unit may
also require an external water supply to operate.

Improper installation, application and service practices can result in water leakage from the unit. Water
leakage can result in catastrophic and expensive building and equipment damage and loss of critical data
center equipment.

Do not locate unit directly above any equipment that could sustain water damage.

We recommend installing a monitored fluid detection system to immediately discover and report coolant fluid
system and condensate drain line leaks.

Risk of leaking water/glycol. Can cause equipment and building damage.

Improper installation, application, and service practices can result in water leakage from the unit. Do not mount
this unit over equipment and furniture that can be damaged by leaking water. Install a water-tight drain pan
with a drain connection under the cooling unit and the ceiling mounted water/glycol condensing unit. Route the
drain line to a frequently used maintenance sink so that running water can be observed and reported in a
timely manner. Post a sign to alert people to report water flowing from the secondary drain pan. We
recommend installing monitored leak detection equipment for the unit and supply lines and in the secondary
drain pan. Check drain lines periodically for leaks, sediment buildup, obstructions, kinks and/or damage and
verify that they are free running.

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NOTICE

Risk of piping system corrosion and freezing fluids. Can cause leaks resulting in equipment and very expensive
building damage. Cooling coils and piping systems are at high risk of freezing and premature corrosion. Fluids
in these systems must contain the proper antifreeze and inhibitors to prevent freezing and premature coil and
piping corrosion. The water or water/glycol solution must be analyzed by a competent local water treatment
specialist before start-up to establish the inhibitor and antifreeze solution requirement and at regularly
scheduled intervals throughout the life of the system to determine the pattern of inhibitor depletion.

The complexity of water/glycol solution condition problems and the variations of required treatment programs
make it extremely important to obtain the advice of a competent and experienced water treatment specialist
and follow a regularly scheduled coolant fluid system maintenance program.

Water chemistry varies greatly by location, as do the required additives, called inhibitors, that reduce the
corrosive effect of the fluids on the piping systems and components. The chemistry of the water used must be
considered, because water from some sources may contain corrosive elements that reduce the effectiveness of
the inhibited formulation. Sediment deposits prevent the formation of a protective oxide layer on the inside of
the coolant system components and piping. The water/coolant fluid must be treated and circulating through
the system continuously to prevent the buildup of sediment deposits and or growth of sulfate reducing
bacteria.

Proper inhibitor maintenance must be performed in order to prevent corrosion of the system. Consult glycol
manufacturer for testing and maintenance of inhibitors.

Commercial ethylene glycol, when pure, is generally less corrosive to the common metals of construction than
water itself. It will, however, assume the corrosivity of the water from which it is prepared and may become
increasingly corrosive with use if not properly inhibited.

NOTICE

NOTICE

We recommend installing a monitored fluid detection system that is wired to activate the automatic closure of
field installed coolant fluid supply and return shut-off valves to reduce the amount of coolant fluid leakage and
consequential equipment and building damage. The shut-off valves must be sized to close off against the
maximum coolant fluid system pressure in case of a catastrophic fluid leak.

Risk of frozen pipes and corrosion from improper coolant mixture. Can cause water leaks resulting in
equipment and building damage.

When piping or the cooling unit may be exposed to freezing temperatures, charge the system with the proper
percentage of glycol and water for the coldest design ambient temperature. Automotive antifreeze is
unacceptable and must NOT be used in any glycol fluid system. Use only HVAC glycol solution that meets the
requirements of recommended industry practices.

Risk of no flow condition. Can cause equipment damage. Do not leave the water/coolant fluid supply circuit in a
no flow condition. Idle fluid allows the collection of sediment that prevents the formation of a protective oxide
layer on the inside of tubes. Keep unit switched On and water/coolant fluid supply circuit system operating
continuously.

1 Im portant Safety Instructions

5

NOTICE

NOTICE

NOTICE

NOTICE

Risk of improper water supply. Can reduce humidifier efficiency or obstruct humidifier plumbing.

Do not use completely demineralized water with this unit. The water must contain minerals for the electrode
principle to work.

Do not use a hot water source. It will cause deposits that will eventually block the fill valve opening.

Risk of water backing up in the drain line. Leaking and overflowing water can cause equipment and building
damage.

Do not install an external trap in the drain line. This line already has a factory installed trap inside the cabinet.
Installation of a second trap will prevent drain water flow and will cause the water to overflow the drain pan.

This line may contain boiling water. Use copper or other material that is rated for handling boiling water for the
drain line. Sagging condensate drain lines may inadvertently create an external trap.

Risk of doorway/hallway interference. Can cause unit and/or structure damage. The unit may be too large to fit
through a doorway or hallway while on the skid. Measure the unit and passageway dimensions, and refer to the
installation plans prior to moving the unit to verify clearances.

Risk of damage from forklift. Can cause unit damage. 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.

NOTICE

Risk of improper storage. Can cause unit damage.

Keep the unit upright, indoors and protected from dampness, freezing temperatures and contact damage.

1.1 AHRICertified

The Liebert® DataMate™ 60-Hz system is AHRI Certified™, the trusted mark of performance assurance for heating,
ventilation, air conditioning, and commercial refrigeration equipment, using AHRI Standard 1360.

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1.2 Agency Listed

Standard 60-Hz units are CSA Certified to the harmonized U.S. and Canadian product safety standard CSA C22.2 No
236/UL 1995 for “Heating and Cooling Equipment” and are marked with the CSA c-us logo.

1 Im portant Safety Instructions

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2 NOMENCLATURE

This section describes the model number configuration for Liebert® DataMate units and components.

2.1 Nomenclature for Evaporator and Chilled Water Units

Table 2.2 below describes each digit of the model number.

Table 2.1 Nomenclature Example

1 2 3 4 5 6 7 8 9 10 11

D M E 0 3 7 E — P H N

Table 2.2 Nomenclature Digit Definitions for Evaporator and Chilled Water Units

Digit Description

Digits 1 , 2, 3 = The Base zunit

DME = DataMate evaporator/chilled water cooling unit

Digits 4, 5, 6 = Nominal Capacity, kB tuh

Digit7, 8 = Cooling Type

C – = Chilled water cooled

E – = Evaporator

Digit9 = Supply Power

P = 208/230V / 1 ph / 60Hz

W = 2 00/220 V / 1ph / 50Hz

Digit10 = Reheat and Humidifica tion

0 = Reheat only

C = Cooling only

H = Reheat and humidifier

Digit11 = Refrigerant/Revision

N = R-407C, field-supplied, field-charged (evaporator)

7 = Revision (chilled water)

2 N omenclature

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2.2 Nomenclature for Condensing Units

This section describes the model number configuration for DataMate condensing units.

2.2.1 Outdoor Prop Fan Condensing Units for Air Cooled Systems

Table 2.4 below describes each digit of the model number.

Table 2.3 Prop Fan Condensing Unit Nomenclature Example

1 2 3 4 5 6 7 8 9 10 11

P F H 0 3 7 A — P L N

Table 2.4 Nomenclature Digit Definitions for Outdoor, Prop Fan Condensing Units

Digit Description

Digits 1 to 3 = The Base Unit

PFH = Prop fan condensingunit with hot gas bypass

Digit4 = Sound Level

0 = Standard

Z = Quiet-Line

Digit5 and 6 = Nominal Capacity, kBtuh

Digit7 = Cooling Type

A = Air cooled

Digit8 = Coil Type

— = Standardcoil

C = Coated coil (epoxy with UVtopcoat)

Digit9 = Supply Power

A = 460V / 3ph / 60Hz

B = 575V / 3ph / 60Hz

M = 380/415V / 3ph / 50Hz

P = 208/230V / 1 ph / 60Hz

S = 220V / 1ph / 50Hz

Y = 208/230V / 3ph / 60Hz

Digit10 = Ambient Rating/Control

L = 95°F Ambient, Liebert® Lee-Temp™

H = 105°F Ambient, Liebert® Lee-Temp™

Digit11 = Refrigerant

N = R-407C field-supplied, field-charged

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2.2.2 Indoor Condensing Units for Air Cooled Systems

Table 2.6 below describes each digit of the model number.

Table 2.5 Indoor, Air Cooled Condensing Unit Nomenclature Example

1 2 3 4 5 6 7 8 9 10

M C D 3 6 A L A H N

Table 2.6 Nomenclature Digit Definitions for Indoor, Air Cooled Condensing Units

Digit Description

Digits 1 to 2 = the Base Unit

MC = Mini-Mate2-style condensing unit

Digit3 = Disconnect

D = Disconnect switch

Digit4 and 5 = Nominal Capacity

24 = 24 kB tuh, 2-ton, 60Hz

35 = 35 kBtuh, 3-ton, 50Hz

36 = 36 kB tuh, 3-ton, 60Hz

Digit6 = Cooling Type

A = Air cooled

Digit7 = Head Pressure Control

L = Liebert® Lee-Temp™ Receiver

Digit8 = Supply Power

A = 460V / 3ph / 60Hz

M = 380/415V / 3ph / 50Hz

P = 208/230V / 1 ph / 60Hz

S = 220V / 1ph / 50Hz

X = 277V / 1ph / 50 Hz

Y = 208/230V / 3ph / 60Hz

Digit9 = Hot Gas B ypass

H = Hot gas bypass

Digit10 = Refrigerant

N = R-407C field-supplied, field-charged

2 N omenclature

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2.2.3 Close Coupled Condensing Unit for Water/Glycol CooledSystems

Table 2.8 below describes each digit of the model number.

Table 2.7 Close Coupled Water/Glycol Condensing Unit Nomenclature Example

1 2 3 4 5 6 7 8 9 10 11

D M C 0 4 0 W G P 0 N

Table 2.8 Nomenclature Digit Definitions for Close Coupled Water/Glycol Units

Digit Description

Digits 1 , 2, 3 = The Base Unit

DMC = DataMate condensingunit

Digits 4, 5, 6 = Nominal Capacity, kB tuh

Digit7, 8 = Cooling Type

WG = Water/Glycol cooled

Digit9 = Supply Power

P = 208/230V / 1 ph / 60Hz

Digits 1 0, 11 = Refrigerant

0N = R-407C, field-supplied, field-charged

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2.2.4 Remote, Indoor Water/Glycol Cooled Condensing Units

Table 2.10 below describes each digit of the model number.

Table 2.9 Remote, Indoor Water/Glycol Condensing Unit Nomenclature Example

1 2 3 4 5 6 7 8 9 10

M C D 3 8 W 2 A H N

Table 2.10 Nomenclature Digit Definitions for Indoor, Water/Glycol Cooled Condensing Units

Digit Description

Digits 1 to 2 = The Base Unit

MC = Mini-Mate2-style condensing unit

Digit3 = Disconnect

D = Disconnect switch

Digit4 and 5 = Nominal Capacity, kBtuh

Digit6 = Cooling Type

W = Water/Glycol cooled

Digit7 = Head Pressure Control

2 = 2-way standardpressure fluid regulating valve

3 = 3-way standard pressure fluid regulating valve

D = 2-way high pressure fluid regulating valv e

T = 3-way high pressure fluid regulating valv e

Digit8 = Supply Power

A = 460V / 3ph / 60Hz

M = 380/415V / 3ph / 50Hz

P = 208/230V / 1 ph / 60Hz

S = 220V / 1ph / 50Hz

X = 277V / 1ph / 50 Hz

Y = 208/230V / 3ph / 60Hz

Digit9 = Hot Gas B ypass

H = Hot gas bypass

Digit10 = Refrigerant

N = R-407C field-supplied, field-charged

2 N omenclature

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2.3 System Configurations

The following figures show the available capacity and cooling options for the Liebert® DataMate.

Figure 2.1 Air Cooled Units

Item Description

1 Air cooled with outdoor condensing unit suitable for installation on a roof or at ground level.

2 Air cooled with indoor condensing unit for applications where roof or other outdoorlocations are impractical.

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Figure 2.2 Water/Glycol Cooled Units

Item Description

1 Water/Glycol cooled with close coupled condensing unit conveniently needs only a single power supply and water supply connection installed.

2 Water/Glycol cooled with remote, indoor condensing unit that installs under the raised floor or above the dropped ceiling.

2 N omenclature

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Figure 2.3 Chilled Water Units

Item Description

1 Chilled water cooled c onnects quickly and easily to a chilled water loop for ease of installation.

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3 SITE PREPARATION AND EQUIPMENT HANDLING

NOTE: Before installing unit, determine whether any building alterations are required to run piping, wiring and
ductwork. Follow all unit dimensional drawings and refer to the submittal engineering dimensional drawings of
individual units for proper clearances.

3.1 Planning Dimensions

The unit dimensions are described in the submittal documents included in the Submittal Drawings on page107.

The following table lists the relevant documents by number and title.

Table 3.1 Dimension Planning Drawings

Docu ment Number Title

Evaporators/Chilled Water Units

DPN000262 Cabinet Dimensions, Evaporator/Chilled Water Unit

IndoorCondensing Units

DPN004420 Cabinet Dimensions, Air Cooled units

DPN004421 Cabinet Dimensions, Water/Glycol Cooled units

DPN000269 Cabinet Dimensions, Close Coupled Water/Glycol Condensing Unit

3.2 Room Preparation

The room should be well insulated and must have a sealed vapor barrier. The vapor barrier in the ceiling and walls can be a
polyethylene film. Paint on concrete walls and floors should be vapor resistant.

NOTE: The vapor barrier is the single most important requirement for maintaining environmental control in the
conditioned area.

Outside or fresh air should be kept to a minimum when tight temperature and humidity control is required. Outside air adds
to the site’s cooling, heating, dehumidifying and humidifying loads. We recommend keeping the outside air below 5% of the
total air circulated in the computer room. Doors should be properly sealed to minimize leaks and should not contain
ventilation grilles.

3.3 Application Limits

Table 3.2 Application Limits for Evaporator and Chilled Water Units

Input Vo ltage Range o f Return Air Co nditio ns to the U nit*

Minimum Maximum Dry Bulb Temperature Relative Humidity

–5% +10% 65 to 85°F (18 to 29°C) 20 to 80%

*The unit willoperate a t these conditions, but it will not control to these conditionextremes.

3 S ite Preparation and Equipment Hand ling

17

Table 3.3 Application Limits for Indoor and Outdoor Air Cooled Condensing Unit

Input Vo ltage

Condensing Unit Type

Minimum Maximum Minimum Maximum

–5% +10%

–5% +10%

*Unit capacity ratings are stated for 95°F (35°C) for standard units and 105°F (41°C)for P FH highambient units. Exceeding these rating points by 20°F (11°C)
will result in lower cooling capacities, but will not dama ge the equipment.

Outdoor prop fa n

condensing unit

Indoorair cooled condensing

unit

Entering Dry Bu lb Air Temperature

115°F (48°C) standard

–30°F (–34°C)

–30°F (–34°C) 115°F (48°C)

ambient unit*

125°F (52°C)high ambient

unit*

Table 3.4 Application Limits for Indoor Water/Glycol Cooled Condensing Unit

Input Vo ltage Entering Fluid Temperature

Minimum Maximum Minimu m Maximum

–5% +10% 65°F (18°C)* 115°F (46°C)

*Operation below 65°F (18°C)m ay result in fluid noise and reduced valve life.

3.4 Location Considerations

When determining installation locations, consider that these units contain water and that water leaks from ceiling mounted
condensing units can cause damage to sensitive equipment and furniture below.

NOTICE

Risk of leaking water/glycol. Can cause equipment and building damage.

Improper installation, application, and service practices can result in water leakage from the unit. Do not mount
this unit over equipment and furniture that can be damaged by leaking water. Install a water-tight drain pan
with a drain connection under the cooling unit and the ceiling mounted water/glycol condensing unit. Route the
drain line to a frequently used maintenance sink so that running water can be observed and reported in a
timely manner. Post a sign to alert people to report water flowing from the secondary drain pan. We
recommend installing monitored leak detection equipment for the unit and supply lines and in the secondary
drain pan. Check drain lines periodically for leaks, sediment buildup, obstructions, kinks and/or damage and
verify that they are free running.

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3.4.1 Location Considerations for Evaporator, Indoor CondensingandChilled WaterUnits

The system can be installed in several ways. However, you should always mount the evaporator on a wall in the equipment
room.

• For an air cooled system with an indoor condensing unit, the condensing unit may be installed near the
evaporator to minimize piping, or near the outside wall to minimize air duct work.

• For water/glycol cooled systems, a DMC condensing unit may be close coupled with the evaporator or a
remote MCD indoor condensing unit may be installed above the ceiling or below a raised floor.

Refer to Refrigerant Line Sizes and Equivalent Lengths on page44 for maximum refrigerant line lengths.

Do not install units in areas where normal unit operating sound may disturb the working environment.

When installing an air cooled or water/glycol cooled unit inside a space, ensure that national and local codes are met for
refrigerant concentration limits that might vary with building type and use.

Try to locate the evaporator in an unobstructed floor space to facilitate service. Avoid locations in confined areas that affect
the air flow pattern and result in short cooling cycles, downdrafts and air noise. Figure 3.1 below, shows location
recommendations. Avoid locating the unit in an alcove or at the extreme end of a long, narrow room. Avoid installing
multiple units close to each other, which can result in crossing air patterns, uneven loads and competing operating modes.
Do not attach additional devices (such as smoke detectors, etc.) to the cabinet. Doing so interferes with routine maintenance
and service.

Figure 3.1 Proper Location in the Room

3 S ite Preparation and Equipment Hand ling

19

3.4.2 Location Considerations for an Outdoor Condensing Unit

For an air cooled system using an outdoor condensing unit, the condensing unit may be mounted on the roof or remotely in
any outdoor area.

Observe the following when planning the installation of the outdoor unit:

• To ensure a satisfactory air supply, locate air cooled condensing units in an environment with clear air, away
from loose dirt and foreign matter that may clog the coil.

• Condensing units must not be located in the vicinity of steam, hot air, or fume exhausts or closer than 18 inches
from a wall, obstruction, or adjacent unit.

• Avoid areas where heavy snow will accumulate at air inlet and discharge locations.

• The condensing unit should be located for maximum security and maintenance accessibility. Avoid ground
level sites with public access. Install a solid base, capable of supporting the weight of the condensing unit.

• The base should be at least 2in. (51mm) higher than the surrounding grade and 2 in. (51mm) larger than the
dimensions of the condensing unit base. For snowy areas, a base of sufficient height to clear snow accumulation
must be installed.

• Securely attach the unit to the base using the holes provided in the unit mounting rails to prevent unit
movement that might stress refrigerant piping and electrical wiring.

Before beginning, refer to Piping and Refrigerant Requirements on page37 for unit placement, piping guidelines, and
refrigerant charge requirements for your system.

The condensing unit must be located within the maximum distance from the evaporator using the evaporator guidelines
listed in Piping when Condensing Unit is Above or Below Evaporator on page43.

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3.5 Unit Weights

Table 3.5 Evaporator and Condensing Unit weights

Evaporator Section

Outdoor, Propeller Fan CondensingUnit

Indoor, Centrifugal Fan Condensing Unit

Model Numb er

lb. (kg)

60Hz 50Hz

DME020E — 230 (104)

DME027E — 330 (150)

DME037E DME037E 365 (166)

DME044C DME044C 365 (166)

PFH020A — 200 (91)

PFH027A — 200 (91)

PFH037 A PFH036A 2 41 (109)

MCD24A — 230 (104)

MCD36A MCD35A 240 (109)

Water/Glycol Cooled CondensingUnit

MCD26W — 175 (79)

MCD38W MCD37W 220 (100)

Close Coupled Water/Glycol CondensingUnit

DMC022WG — 170 (77)

DMC029WG — 17 0 (77)

DMC040WG — 170 (77)

3.6 Equipment Inspection and Handling

CAUTION: Risk of contact with sharp edges, splinters, and exposed fasteners. Can cause injury. Only
properly trained and qualified personnel wearing appropriate, OSHA approved PPE should attempt to move,
lift, remove packaging from or prepare the unit for installation.

Do not un-crate the equipment until it is close to its final location. All required assemblies are banded and shipped in
corrugated containers. If any damage is discovered when the unit is un-crated, report it to the shipper immediately. If any
concealed damage is later discovered, report it to the shipper and to your Vertiv representative.

3 S ite Preparation and Equipment Hand ling

21

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4 INSTALLATION

Refer to the appropriate installation procedures depending the configuration and options of your Liebert® DataMate
Thermal Management System.

4.1 Installing Wall Mounted EvaporatorsandChilled Water Units

WARNING! Risk of unit falling off of the wall. Can cause building and equipment damage and serious injury. A
licensed professional structural engineer should evaluate the wall to determine if the unit may be safely
mounted on the wall and determine the type and size of fasteners required to support the weight of the unit
during all phases of operation because some vibration may occur during start, stop, and operation cycles.
The wall may need to be reinforced to support the maximum load of the unit. See Table 3.5 on page21, for
unit weights.

Unlatch the front cabinet door and remove the screws that secure the cabinet to the chassis. Lift off the cabinet. Eight
keyholes (0.50 in. head, 0.22 in. slot) are provided on the back of the unit for mounting on the wall. The unit must be level.

4.1.1 Changing Air Flow Direction

The air discharge grille on the evaporator can be placed in one of three different positions: vertical, horizontal, or 45°.

To change the air flow direction:

1. Remove the front panel using quarter-turn fasteners.

2. Remove the cabinet by removing the four retaining screws, then lift off the cabinet.

3. Remove the left end panel.

4. Remove the grille by sliding it to the left end of the unit.

5. Rotate or invert the grille to change the air discharge direction.

6. Reverse steps 1 through 4, to re-assemble the unit.

4 Inst allation

4.2 Installing Outdoor Condensing Unit forAir CooledSplit Systems

Refer to the appropriate guidelines and drawings when installing an outdoor, condensing unit for an air cooled split system.
See Location Considerations for an Outdoor Condensing Unit on page20. Follow all applicable national and local building,
electrical and plumbing codes.

4.3 Installing Ceiling Mounted Condensing Units

WARNING! Risk of ceiling collapse and heavy unit falling. Can cause building and equipment damage, serious
injury or death. If using a ceiling mounted condensing unit, verify that the supporting roof structure is
capable of supporting the weight of the unit(s) and the accessories. See Table 3.5 on page21, for the unit
weights. Securely anchor the top ends of the suspension rods and verify that all nuts are tight.

23

NOTICE

Risk of leaking water/glycol. Can cause equipment and building damage.

Improper installation, application, and service practices can result in water leakage from the unit. Do not mount
this unit over equipment and furniture that can be damaged by leaking water. Install a water-tight drain pan
with a drain connection under the cooling unit and the ceiling mounted water/glycol condensing unit. Route the
drain line to a frequently used maintenance sink so that running water can be observed and reported in a
timely manner. Post a sign to alert people to report water flowing from the secondary drain pan. We
recommend installing monitored leak detection equipment for the unit and supply lines and in the secondary
drain pan. Check drain lines periodically for leaks, sediment buildup, obstructions, kinks and/or damage and
verify that they are free running.

4.3.1 Installing Suspension Rods andMounting Ceiling Units

Refer to the Location Considerations on page18 before beginning installation. These instructions apply to indoor air cooled
and remote indoor water/glycol condensing units.

NOTE: Follow all national and local building, electrical, and plumbing codes.

• The ceiling and ceiling supports of existing buildings may require reinforcements.

• Four 3/8-in.-16 TPI threaded suspension rods are required and field supplied.

• The factory supplied 3/8-in. 16 TPI hardware kit includes the remaining installation hardware.

• Recommended clearance between ceiling grids and building structural members is the unit’s height plus 3in.
(76mm).

To install the suspension rods:

1. Install the four field supplied 3/8-in. 16 TPI threaded rods by suspending them from suitable building structural
members so that they will align with the four mounting locations on the unit base.

2. Securely anchor the top ends of the suspension rods with field supplied nuts.

3. Make sure all nuts are tight and locked.

To lift and install the unit on the rods:

1. Using a suitable lifting device that is rated for the weight of the unit (see Unit Weights on page21), raise the
unit and pass the threaded rods through the four mounting locations in the unit base.

2. Attach the threaded rods to the flanges using the plain nuts to hold the unit in place as shown in Figure 4.1 on
the facing page.

3. Slowly lower the lifting device, making sure that the rods securely hold the weight of the unit.

4. Adjust the plain nuts to distribute the weight of the unit evenly by the rods, making sure that the unit does not
rest on the ceiling grid and that the unit is level.

5. Use the Nylock nuts to jam the plain nuts in place as shown in Figure 4.1 on the facing page.

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Figure 4.1 Installing Threaded Rods and Hardware of Ceiling Mounted Units

Item Description Item D escription

1 3/8-in. threaded rod, field-supplied 7 3/8-in. fender washer

2 3/8-in. hex nut 8 3/8-in. hex nut

3 3/8-in. washer 9 3/8-in. N ylock locking nut

4 Sleeve 10 Unit base pan (reference)

5 Bracket on unit

6 Isolator

4 Inst allation

25

4.3.2 Guidelines for Ducted Systems

Observe the following for all ductwork:

• Ductwork should be fabricated and installed in accordance with local and national codes.

• Use flexible ductwork or nonflammable cloth collars to attach ductwork to the unit and to control vibration
transmission to the building.

• Attach the ductwork to the unit using the flanges provided.

• Locate the unit and ductwork so that the discharge air does not short circuit to the return air inlet.

• Avoid directing the hot exhaust air toward adjacent doors or windows.

• Ductwork that runs through a conditioned space or is exposed to areas where condensation may occur must be
insulated. Insulation of ductwork is vital to prevent condensation during the cooling cycle.

• The use of a vapor barrier is required to prevent absorption of moisture from the surrounding air into the
insulation.

• If the return air duct is short or if noise is likely to be a problem, sound absorbing insulation should be used
inside the duct.

• Ductwork should be suspended using flexible hangers. Ductwork should not be fastened directly to the building
structure.

• For multiple unit installations, space the units so that the hot condensing unit exhaust air is not directed toward
the air inlet of an adjacent unit.

Consider the following in specific applications of ductwork to condensing units:

• In applications where the ceiling plenum is used as the heat rejection domain, the discharge air must be
directed away from the condensing unit air inlet and a screen must be added to the end of the discharge duct
to protect service personnel. Locate the air discharge a minimum of 4 ft. from an adjacent wall. Failure to do so
may result in reduced air flow and poor system performance.

• If the condensing unit draws air from the outside of the building, rain hoods must be installed. Hood intake and
ductwork cross-sectional area dimensions should be equal to or greater than the area of the condensing unit
intake flange. In addition, install a triple layer bird screen over rain hood openings to eliminate the possibility of
insects, birds, water, or debris entering the unit. Avoid directing the hot exhaust air toward adjacent doors or
windows.

Table 4.1 Indoor Condensing Unit Airflow, CFM at0.5iwg(124PA) esp

2 Ton 3 Ton

1000 1430

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4.4 Close Coupled Installations forIntegralWater/Glycol CondensingUnits

You can mount the evaporator and indoor, DMC water/glycol cooled condensing unit directly next to each other, close
coupled.

The DMC condensing unit attaches to the left side of the evaporator chassis. For connection sizes, see Table 5.2 on
page37, for the appropriate submittal drawing for your unit. For condensing unit fluid requirements, see Water/Glycol Loop

Piping on page40.

To install the close coupled condensing unit:

1. You will need access to the rear of the unit, so make sure that the evaporator and condensing unit are moved
away from the wall for the installation.

2. On the evaporator, open the quarter-turn fasteners and remove the front access panel, then remove the four
screws from the front of the evaporator, see Figure 4.2 below.

Figure 4.2 Remove Front Access Cover and Evaporator Screws

4 Inst allation

Item Description

1 Remove front access panel.

2 Remove 4 screws.

3. Remove the evaporator's panel assembly by lifting up and away from the unit, see Figure 4.3 on the next
page.

27

Figure 4.3 Remove Evaporator Panel Assembly

4. On the left end of the evaporator, remove the six screws that fasten the chassis extension to the evaporator:

• Two screws from the inside, bottom as shown in Figure 4.4 below.

• Four screws from the back side.

• Save the six screws to use when attaching the condensing unit.

NOTE: This piece is not used with the close coupled units and may be recycled.

Figure 4.4 Remove the Chassis Extension

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Item Description

1 2 screws at bottom (4 more on back of unit)

2 Chassis extension (not used in close coupling, recycle)

5. On the evaporator panel assembly:

• Remove the cutout from the bottom-left side, see Figure 4.5 below.

• Remove the support bracket inside the bottom-left side, see Figure 4.6 below.

Figure 4.5 Cutout to Remove from Panel Assembly

Figure 4.6 Support Bracket to Remove from Panel Assembly

4 Inst allation

29

6. On the condensing unit, open the quarter-turn fasteners and remove the front access panel, see Figure 4.7

below.

Figure 4.7 Remove Front Access Panel from Condensing Unit

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7. Prepare to cut the refrigerant piping:

• Carefully remove the insulation from the suction line, see Figure 4.8 below.

• Slide the units together, and mark the connection point.

CAUTION: Risk of explosion from high pressure inert gases. Cutting pressurized lines can cause serious
injury. Do not cut the liquid and suction lines until nitrogen has been purged.

Figure 4.8 Mark the Pipes to Cut for Connection

Item Description

1 Insulation ca refully removed.

2 Unitstogether to m ark pipes.

4 Inst allation

31

8. Slide the units apart.

9. Purge the nitrogen in both evaporator and condensing unit sections.

NOTE: Make sure that you plan enough time to complete steps 10 to 13, and all the steps in Connecting the Close

Coupled Refrigerant Circuit on the facing page, on the same day. This is critical to keep moisture out of the system.

10. Use a tube cutter to cut the pipes, then install tubing sleeves on the suction and liquid lines, see Figure 4.9

below.

Figure 4.9 Pipe Cut with Tubing Sleeve Installed

11. Slide the units together, and install the four screws removed in step 4 into the rear of the units to join the
chassis, see Figure 4.10 on the facing page.

12. From the front in the blower section, install the two screws removed in step 4 into the clearance holes in the
evaporator section and make sure they grab the bite holes in the condensing unit, see Figure 4.10 on the
facing page.

13. Proceed to Connecting the Close Coupled Refrigerant Circuit on the facing page.

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Figure 4.10 Fastening the Evaporator and Condensing Unit Chassis Together

Item Description

1 Screw locations on rear of unit.

2 Screwsfrom blowersection to condenser section.

4.4.1 Connecting the Close Coupled Refrigerant Circuit

1. Access the liquid line from the front and suction line through front and rear of unit, see Figure 4.11 on the next
page. Loosen or remove the piping brackets/clamps as necessary to connect the lines.

2. Remove the clamps, and slide the tubing sleeve into place making sure that the connection point is in the
middle of the sleeve for both the liquid line and suction line connections

3. Use a brazing blanket to protect the expansion valve capillary tube and the equalizer line, and move wiring
away from the brazing area.

IMPORTANT! Use good brazing practices and flowing nitrogen during brazing. See Field Fabricated Refrigeration

Piping on page46, for detailed steps.

4. Braze the liquid line from the front of the unit.

5. Braze the suction line from the front and rear of the unit.

6. Replace the clamps and replace the suction line insulation.

4 Inst allation

33

Figure 4.11 Liquid Line and Suction Line Connections

Item Description

1 Liquidconnection with sleev e in place (front panel access)

2 Suctionconnection (rear panel access)

3 Sleeve in place on suction connection

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4.4.2 Connecting the Close Coupled Electrical Wiring

WARNING! Arc flash and electric shock hazard. Open all local and remote electric power supply disconnect
switches, verify with a voltmeter that power is Off and wear appropriate, OSHA approved personal protective
equipment (PPE) per NFPA 70E before working within the 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 Liebert® controller does
not isolate power from the unit, even in the Unit Off mode. Some internal components require and receive
power even during the Unit Off mode of the controller. 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.

When close coupling the DataMate evaporator with the integral, water/glycol condensing unit, a single power feed
connection is made at the condensing unit. The condensing unit ships with a power/control wire harness to internally
connect the two units.

1. Refer to Electrical Connection Requirements on page55, and Water/Glycol Cooled Unit Control Connections on
page57, for input power and control wiring requirements before making the electrical connections.

2. Route the wiring harness from the condensing unit along the top of the evaporator as shown in Figure 4.12

below.

3. Refer to the unit electrical schematic and to DPN000271 included in the Submittal Drawings on page107 to
make the appropriate connections.

4. If the integral condensing unit is used in a glycol loop, it must be connected to the drycooler. There are
terminals on the condensing unit electric box for Class1 wiring to the heat rejection equipment.

Figure 4.12 Power/Control Wire Harness Routing

4 Inst allation

35

4.4.3 Final Installation Steps for Close Coupled Units

1. Refer to Installing Wall Mounted EvaporatorsandChilled Water Units on page23, to install the close coupled
unit on the wall, if necessary.

2. Refer to Fluid Piping Required on page38, and the appropriate piping connection drawings included in the

Submittal Drawings on page107, to connect the heat rejection equipment and other fluid piping connections,

as necessary.

3. Refer to Evacuation and Leak Testing Water/Glycol Cooled Systems on page50, and Charging Water/Glycol

Cooled Systems on page52, to charge the system with refrigerant.

4. Replace the evaporator panel assembly and secure it with the four screws on the front of the evaporator.

5. Replace the front access panels on the evaporator and condensing unit, and secure the panels with the quarter­turn fasteners.

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5 PIPING AND REFRIGERANT REQUIREMENTS

All field supplied refrigeration piping to the unit must be sweat copper. Use prevailing good piping practices for all
connections which include brazing copper pipes using a brazing alloy of minimum temperature of 1350 °F (732 °C) and
adhering to all local codes. All other fluid connections to units, with the exception of the condensate drain, are sweat copper.
Factory installed piping brackets must not be removed. Field installed piping must be installed in accordance with local
codes and must be properly assembled, supported, isolated, and insulated. Avoid piping runs through noise sensitive areas,
such as office walls and conference rooms.

The following pipe connections are required:

• A drain line from the evaporator coil drain pan.

• A drain line from the optional humidifier (if applicable).

• A drain line from the optional condensate pump (if applicable).

• A water supply line to the optional humidifier (if applicable).

• On air cooled and water/glycol cooled systems: refrigerant piping connections between the evaporator unit and
the condensing unit.

• On chilled water systems: connections to the building chilled water source. See Chilled Water Loop Piping on
page39, for additional requirements.

• On water/glycol systems: connections to a water or glycol loop. See Water/Glycol Loop Piping on page40, for
additional requirements.

Refer to specific text and detailed diagrams in this manual for other unit specific piping requirements.

The pipe connection locations, piping general arrangement, and schematics are described in the submittal documents
included in the Submittal Drawings on page107.

The following tables list the relevant documents by number and title.

Table 5.1 Piping General Arrangement Drawings

Docu ment Number Title

DPN004406 Piping, Air Cooled Models

DPN004405 Piping, Split System Water/Glycol Models

DPN004403 Piping, Close Coupled Water/Glycol and Chilled Water Models

Table 5.2 Piping Connection Drawings

Docu ment Number Title

Evaporator and Chilled Water Units

DPN004306 Piping Connections, Chilled Water Units

Split System IndoorCondensing Units

DPN004420 PipingConnections, Air Cooled Condensing Unit

DPN004421 Piping Connections, Remote Water/Glycol Cooled Condensing Unit

DPN004309 Piping Connections, Close Coupled Water/Glycol Cooled Units

5 Pip ing and Refrigeran t Requirements

37

5.1 Fluid Piping Required

5.1.1 Evaporator Drain Line Installation Requirements

A 3/4 in. (19mm) OD hose barb connection is provided for the evaporator coil condensate drain.

Observe the following requirements when installing and routing the drain line:

• The drain line must be located so it will not be exposed to freezing temperatures.

• The drain should be the full size of the drain connection.

• Pitch the drain line per local and national codes.

NOTE: The drain line must be trapped outside the unit.

5.1.2 Humidifier Drain Line Installation Requirements

On units with an optional humidifier, a 1/2 in. (13mm) OD hose barb connection is provided for the steam generating
humidifier canister.

Observe the following requirements when installing and routing the drain line:

• The drain should be the full size of the drain connection.

• Pitch the drain line per local and national codes.

NOTE: The drain line must be trapped outside the unit. This line may contain boiling water. User copper or other
suitable material for the drain line.

5.1.3 Condensate Drain Pump Kit

WARNING! Risk of electric shock. Can cause equipment damage, injury, or death. Open all local and remote
electric power supply disconnect switches and verify with a voltmeter that power is off before working within
any electric connection enclosures. Service and maintenance work must be performed only by properly
trained and qualified personnel and in accordance with applicable regulations and manufacturers’
specifications. Opening or removing the covers to any equipment may expose personnel to lethal voltages
within the unit even when it is apparently not operating and the input wiring is disconnected from the
electrical source.

The optional condensate pump kit is required when the evaporator is installed below the level of the gravity fed drain line.
The condensate pump is field installed inside the evaporator unit. The pump kit includes a check valve, sump, sump level
sensor, controls, fittings, and complete instructions.

Table 5.3 Condensate Drain Pump Drawings

Docu ment Number Title

DPN004306 Field Installed Pump Connection

To install the condensate drain pump:

1. Refer to the instructions and drawings supplied with the pump.

2. Disconnect all power to the unit, and remove the evaporator housing.

3. Make the following piping connections, see Table 5.3 above:

• Unit drain pan

• Unit's humidifier drain (if applicable)

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• Output to field provided/field installed drain line

4. With the wiring harness, make the following electrical connections to :

• Connect yellow electric leads L1 and L2 to the line voltage terminal block in the cooling unit.

• Connect the green ground lead to the lug near the terminal block.

• Connect red wires from the auxiliary pump contacts to terminals TB6-4 and TB6-5 to shut down unit at
the occurrence of a high water condition in the pump.

5. Tighten all connections and, before installing the housing, run the unit to make sure the pump works properly.
Operate the pump and check the drain line and discharge line for leaks. Correct as needed.

NOTE: Schedule periodic inspection of the piping connections. Clean the pump's sump at the same time you wash the
evaporator air filter. We recommend at least monthly cleaning.

5.1.4 Water Supply Line to the Humidifier

Units supplied with the optional humidifier package have a 1/4-in. (6.2-mm) tube compression at the water supply inlet.

• The supply pressure range is 10psig to 150psig (69kPag to1034kPag).

• The required flow rate is 1 gpm (3.8 lpm).

• Install a shut-off valve in the supply line to isolate the humidifier for maintenance.

5.1.5 Chilled Water Loop Piping

NOTICE

Risk of piping system corrosion and freezing fluids. Can cause leaks resulting in equipment and very expensive
building damage. Cooling coils and piping systems are at high risk of freezing and premature corrosion. Fluids
in these systems must contain the proper antifreeze and inhibitors to prevent freezing and premature coil and
piping corrosion. The water or water/glycol solution must be analyzed by a competent local water treatment
specialist before start-up to establish the inhibitor and antifreeze solution requirement and at regularly
scheduled intervals throughout the life of the system to determine the pattern of inhibitor depletion.

The complexity of water/glycol solution condition problems and the variations of required treatment programs
make it extremely important to obtain the advice of a competent and experienced water treatment specialist
and follow a regularly scheduled coolant fluid system maintenance program.

Water chemistry varies greatly by location, as do the required additives, called inhibitors, that reduce the
corrosive effect of the fluids on the piping systems and components. The chemistry of the water used must be
considered, because water from some sources may contain corrosive elements that reduce the effectiveness of
the inhibited formulation. Sediment deposits prevent the formation of a protective oxide layer on the inside of
the coolant system components and piping. The water/coolant fluid must be treated and circulating through
the system continuously to prevent the buildup of sediment deposits and or growth of sulfate reducing
bacteria.

5 Pip ing and Refrigeran t Requirements

39

Proper inhibitor maintenance must be performed in order to prevent corrosion of the system. Consult glycol
manufacturer for testing and maintenance of inhibitors.

Commercial ethylene glycol, when pure, is generally less corrosive to the common metals of construction than
water itself. It will, however, assume the corrosivity of the water from which it is prepared and may become
increasingly corrosive with use if not properly inhibited.

We recommend installing a monitored fluid detection system that is wired to activate the automatic closure of
field installed coolant fluid supply and return shut-off valves to reduce the amount of coolant fluid leakage and
consequential equipment and building damage. The shut-off valves must be sized to close off against the
maximum coolant fluid system pressure in case of a catastrophic fluid leak.

NOTICE

Risk of no flow condition. Can cause equipment damage.

Do not leave the water/coolant fluid supply circuit in a no flow condition. Idle fluid allows the collection of
sediment that prevents the formation of a protective oxide layer on the inside of tubes. Keep unit switched On
and water/coolant fluid supply circuit system operating continuously.

See Table 5.4 below, for the chilled water loop requirements.

Install manual service shut-off valves at the supply and return lines of each unit. These shut-off valves are used for routine
service and for emergency isolation of the unit.

Refer to the appropriate piping general arrangement schematics for your system for the recommended, field installed
hardware such as shut-off valves and hose bibs. See Table 5.1 on page37.

NOTE: Ambient conditions and the minimum supplied water temperature determines whether or not you should
insulate the chilled water supply and return lines to prevent condensation on the lines.

Table 5.4 Requirements for Chilled Water Loop Installation

Minimum Recomm ended

Water Temperature, °F(°C)

42 (5.5) 300 (2,0 68) with a max imum close off pressure of 60psig(414kPa) 7/8 O. D. Cu

Standard Pressure Valve

Design Pressure, Psig(Kpag)

Supp ly/Return

Connection Sizes,

in.

5.1.6 Water/Glycol Loop Piping

NOTICE

Risk of frozen pipes and corrosion from improper coolant mixture. Can cause water leaks resulting in
equipment and building damage.

When piping or the cooling unit may be exposed to freezing temperatures, charge the system with the proper
percentage of glycol and water for the coldest design ambient temperature. Automotive antifreeze is
unacceptable and must NOT be used in any glycol fluid system. Use only HVAC glycol solution that meets the
requirements of recommended industry practices.

Do not use galvanized pipe.

Install manual service shut-off valves at the supply and return line to each unit. This permits routine service and emergency
isolation of the unit. Refer to the appropriate submittal drawing for the piping connection sizes of your unit, see Table 5.2

on page37.

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Refer to the appropriate piping general arrangement schematics for your system for the recommended, field installed
hardware such as shut-off valves. See Table 5.1 on page37.

When the fluid quality is poor, we recommend installing a 16-20# mesh Y strainer filter in the supply line to extend the
service life of the coaxial condensers. These filters must be easily replaced or cleaned.

The standard maximum fluid pressure is 150 psig (1034 kPa). For applications above this pressure, contact a Vertiv
representative.

The water cooled system will operate in conjunction with a cooling tower or city water. The water/glycol cooled system will
operate in conjunction with a cooling tower, city water, or drycooler.

NOTE: HVAC grade ethylene or propylene glycol should be used on glycol systems. Automotive antifreeze must not
be used.

Water/Glycol Coolant Regulating Valve

Water/glycol cooled units include a coolant flow regulating valve that may require adjustment.

To adjust the valve:

1. Attach refrigeration gauges to the compressor discharge and suction lines.

2. Raise the head pressure by turning the adjusting screw clockwise.

3. Allow enough time between adjustments for the system to stabilize. Refer to recommended operating
pressures in Water/Glycol Loop Piping on the previous page.

4. The coolant flow should stop when the refrigeration system is off for approximately 10 to 15 minutes. If the
coolant continues to flow, the valve is improperly adjusted (head pressure is too low).

5. Flush the valve by inserting a screwdriver or similar tool under the two sides of the main spring and lifting. This
opens the valve seat and flushes out any dirt particles,

5 Pip ing and Refrigeran t Requirements

41

5.2 Refrigerant Piping

WARNING! Risk of over-pressurization of the refrigeration system. Can cause piping rupture, explosive
discharge of high pressure refrigerant, loss of refrigerant, environmental pollution, equipment damage,
injury, or death. This unit contains fluids and gases under high pressure. Use extreme caution when
charging the refrigerant system. Do not pressurize the system higher than the design pressure marked on
the unit's nameplate. Relieve pressure before cutting into or making connections/disconnections to the
piping system. Local building or plumbing codes may require installing a pressure relief device in the
system.

Consult local building and plumbing codes for installation requirements of additional pressure relief devices
when isolation valves are field installed. Do not isolate any refrigerant circuits from over-pressurization
protection. The PFH and MCD condensing units include a factory installed pressure relief valve mounted on
top of the receiver. The valve is rated for a maximum working pressure of 475 psig.

NOTICE

Risk of oil contamination with water. Can cause equipment damage.

Liebert®DataMateDX systems require the use of POE (polyolester) oil. POE oil absorbs water at a much faster
rate when exposed to air than previously used oils. Because water is the enemy of a reliable refrigeration
system, extreme care must be used when opening systems during installation or service. If water is absorbed
into the POE oil, it will not be easily removed and will not be removed through the normal evacuation process. If
the oil is too wet, it may require an oil change. POE oils also have a property that makes them act as a solvent
in a refrigeration system. Maintaining system cleanliness is extremely important because the oil will tend to
bring any foreign matter back to the compressor.

NOTICE

Risk of improper refrigerant charging. Can cause equipment damage.

Refrigerant charge must be weighed into compressorized systems before they are started.

Split systems require two refrigerant lines between the evaporator and the condensing unit:

• One insulated copper suction line

• One copper liquid line

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Observe the following requirements for all field supplied refrigeration piping:

• All piping must be ACR type copper.

• For all piping connections, use prevailing good piping practices, which includes brazing copper pipes using a
brazing alloy of a minimum temperature of 1350°F(732°C) and adhere to local codes.

• Factory installed piping brackets must not be removed.

• Piping must be installed in accordance with local codes and must be properly assembled, supported, isolated,
and insulated.

• Use prevailing good refrigeration practices such as piping supports, leak testing, evacuation, dehydration, and
charging of the refrigeration circuits.

• Isolate the refrigeration piping from the building with vibration isolating supports.

• Avoid piping runs through noise sensitive areas such as office walls and conference rooms.

• When sealing openings in walls and to reduce vibration transmission, use a soft, flexible material to pack
around the tubes to prevent tube damage.

• When installing remote condensing units above the evaporator, the suction gas lines should be trapped at the
evaporator. These traps will retain refrigerant oil in the off cycle. When the unit starts, oil in the traps is carried
up the vertical risers and returns to the compressors.

5.2.1 Piping when Condensing Unit is Above or Below Evaporator

Refer to Pipe Length and Condensing Unit Elevation Relative to Evaporator below, for the maximum vertical rise/fall
between condensing unit and evaporator.

When installing remote condensing units above the evaporator, trap the suction gas line at the evaporator as shown in
Figure 5.1 on the next page. This trap will retain refrigerant oil during the Off cycle. When the unit starts, oil in the trap is
carried up the vertical riser and returns to the compressor. For rises over 25ft.(7.6m), trap every 20ft.(6m) or evenly
divided.

When installing remote condensing units below the evaporator, trap the suction gas line with an inverted trap the height of
the evaporator as shown in Figure 5.1 on the next page. This prevents refrigerant migration to the compressor during Off
cycles. The maximum recommended vertical level drop to condensing unit is15ft.(4.6m).

Table 5.5 Pipe Length and Condensing Unit Elevation Relative to Evaporator

Nomin al

SystemSize, Ton

1.5 a nd 2 150 (45) 40 (12) 15 (4.6)

3 1 50 (45) 50 (15) 15 (4.6)

Maximum recommended total equivalent pipe length is 150 ft. (46m). Suction and liquid lines may require

additional specialty items when vertical lines exceed 20 ft. (6m) and/or condensing unit installation
is more than 15 ft. (4.6m) below the evaporator. Contact Vertiv Technical Supportfor a ssistance.

Maximum Equivalent

PipeLength, ft. (m)

Maximum

Condensing Unit Level

Abo veEvaporator, ft.(m)

Maximum

Condensing Unit Level

BelowEvaporator, ft.(m )

5 Pip ing and Refrigeran t Requirements

43

Figure 5.1 Refrigerant Piping Diagram when Condenser is Above or Below Evaporator

NOTE: Any horizontal pipe must be pitched down toward the condensing unit at a minimum rate of 1/2in. (13mm) per
10ft.(3m) to assure oil return to compressor.

Item Description

1 Condensingunit above evaporator

2 Condensing unit below evaporator

3 Evaporator

4 Condensing unit

5.2.2 Refrigerant Line Sizes and Equivalent Lengths

The following tables list information required to field install the refrigerant piping for the system.

The pipe connection sizes for your equipment are included in the appropriate submittal documents included in the

Submittal Drawings on page107.

Table 5.6 Recommended Refrigerant Line Sizes, O.D. cu by Equivalent Length

Equivalent

Length, ft. (m)

50 (15) 5/8" 3/8" 7 /8" 3/8" 7/8" 1/2"

75 (23) 7/8" 3/8" 7/8" 3/8" 7 /8" 1/2"

100 (30) 7 /8" 3/8" 7/8" 1 /2" 1-1/8"

125 (38) 7/8" 1/2" 7/8" 1/2" 1 -1/8"

150 (45) 7/8" 1/2" 7/8" 1 /2" 1-1/8"

1. Suction line and liquidline sizing based on <3psi pressure dropin each and horizontal suctionline refrigerant velocities
>700FPM(3.6m/s).

2. Suction sizes should be reduced one pipe size for v ertical riser sections to maintain suction line velocity >1,000FPM(5.1m/s)for
proper oil return.

Source: DPN000788 Rev. 13

Suction Liquid Suction Liqu id Suction Liquid

1.5 Ton 2 Ton 3 Ton

2

2

2

1/2"

1/2"

1/2"

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Table 5.7 Equivalent Lengths for Various Pipe Fittings, ft. (m)

Copper Pipe

OD, in.

90 Degree

Elbow Co pper

90 Degree

Elbow Cast

1/2 0.8 (0.24) 1.3 (0.39) 0.4 (0.12) 2.5 (0.76) 0.26 (0.07 ) 7.0 (2.13) 4.0 (1.21)

5/8 0.9 (0.27) 1. 4 (0.42) 0.5 (0.15) 2. 5 (0.76) 0. 28 (0.08) 9.5 (2.89) 5.0 (1.52)

3/4 1.0 (0.3) 1.5 (0. 45) 0.6 (0.18) 2.5 (0.76) 0.3 (0.09) 12.0 (3.65) 6.5 (1.98)

7/8 1.45 (0.44) 1. 8 (0.54) 0.8 (0.24) 3.6 (1.09) 0. 36 (0.1) 17.2 (5.24) 9.5 (2.89)

1-1/8 1.85 (0.56) 2.2 (0.67) 1.0 (0.3) 4.6 (1.4) 0.48 (0.1 4) 22.5 (6.85) 12. 0 (3.65)

1-3/8 2.4 (0.73) 2.9 (0.88) 1.3 (0.39) 6.4 (1.95) 0.65 (0.19) 32.0 (9.75) 1 6.0 (4.87)

1-5/8 2.9 (0.88) 3.5 (1.06) 1.6 (0.48) 7 .2 (2.1 9) 0.72 (0.21 ) 36.0 (10.97) 19.5 (5.94)

Refrigerant trap = Four times equivalent length of pipe per this table

5.3 Refrigerant Charge Requirements

Table 5.8 R-407C Refrigerant Unit Charge

60 Hz 50 Hz Charge R-407C, oz (kg)

DME020E — 4 (0.1 1)

DME027E — 5 (0.14)

DME037E DME037E 6.5 (0.18)

MCD24AL_HN — 134 (3.80)

45 Degree

Elbow

Tee

Gate

Valve

Globe

Valve

Angle

Valve

MCD36AL_HN MCD35AL_HN 21 3 (6.04)

MCD26W__HN — 41 (1.16)

MCD38W__HN MCD37W__HN 54 (1. 54)

DMC022WG — 47 (1. 33)

DMC029WG — 59 (1.67

DMC040WG — 61 (1.72)

PFH020A-_LN — 134 (3.80)

PFH027A-_LN — 134 (3.80)

PFH027A-_HN — 213 (6.04)

PFHZ27A-_LN — 213 (6.04)

PFH037 A-_LN PFH0 36A-_LN 213 (6.04)

PFH037 A-_HN PFH036A-_HN 426 (12.08)

PFHZ37A-_LN PFHZ36A-_LN 426 (12.08)

5 Pip ing and Refrigeran t Requirements

45

Table 5.9 Line Charges of R-407C Refrigerant Using Type-L Copper Tube

Line Size, OD, in.

3/8 3.6 (1.6) —

1/2 6.7 (3.0) 0.2 (0.1)

5/8 10. 8 (4.8) 0.3 (0.1)

3/4

7/8 22.3 (10.0) 0.5 (0.3)

1-1/8 38.0 (17. 0) 0.9 (0.4)

1-3/8 57.9 (25.9) 1. 4 (0.7)

Source: DPN003099 Rev . 1

Liquid Lin e, lb/100ft (kg/30m)

16.1 (7. 2) 0.4 (0.2)

Suction Line, lb/100ft (kg/30m)

5.3.1 Field Fabricated Refrigeration Piping

Use copper pipe with high temperature brazed joints for all field fabricated refrigeration piping. Use a brazing alloy with a
minimum temperature of 1350°F (732°C), such as Sil-Fos. Avoid soft solders such as 50/50 or 95/5.

1. Measure pipe runs and calculate pipe size and equivalent feet of suction and liquid lines per the tables in

Refrigerant Line Sizes and Equivalent Lengths on page44.

2. Determine the type of trap to use on the suction line next to the evaporator based on the position of the
condensing unit per Piping when Condensing Unit is Above or Below Evaporator on page43.

3. Determine the number and placement of traps on vertical rises, and install traps on the suction line piping at
the base of a rise over 5 ft. (1.5 m) and every 20 ft. (6 m) of vertical rise.

4. The evaporator and condensing units come with an inert gas holding charge. Release pressure before cutting
the spun closed end of the piping.

NOTE: You can only evacuate the system properly if you open the hot gas bypass and liquid line solenoid valves (if
equipped)inside the condensing unit and you account for all check valves, see Figure 5.2 on the facing page.
Connect manifold gauge hoses to the discharge and suction line Schrader ports, remove the solenoid valve holding
coils from the hot gas bypass and liquid line solenoid valves (if equipped), and apply a solenoid valve service magnet
to the valves to obtain a proper vacuum.

5. Use a flow of dry nitrogen through the piping during brazing to prevent formation of copper oxide scale inside
the piping. A pure dry nitrogen flow of 1to3ft.3/min (0.5to1.5 l/s) inside the pipe during brazing is sufficient to
displace the air. Control the flow using a suitable metering device.

NOTE: Copper oxide forms when copper is heated in the presence of air. POE oil will dissolve these oxides from inside
the copper pipes and deposit them throughout the system, clogging filter driers and affecting other system
components.

5.3.2 Evacuation and Leak Testing Air Cooled Systems

For proper leak check and evacuation, you must open all system valves and account for all check valves, see Figure 5.2 on
the facing page.

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Figure 5.2 Valves and Connections

5 Pip ing and Refrigeran t Requirements

47

Item Description

1 Apply a manifold gauge hose on the suction line Schrader port.

2 Apply a manifold gauge hose on the discharge line Schrader port.

3 Unplug the wires and remov e the solenoid v alve holding coils, then apply solenoidvalve service magnets to the valves.

4 Suction line

5 Liquid injection valve bulb

Schrader port with v alve core

NOTE: The syst em includes a factory installedS chrader valve with core in the liquidline downstream of the receiver. Proper evacuation of

6

the condenser side of the system can be accomplished only usingthe downstr eam Schrader valve. See the appropriate piping schematic
for your system in Submittal Drawings on page107.

7 Scroll compressor

8 High pressure switch

9 Condenser coil

10 Hot gas bypass solenoid v alve

11 Hot gas bypass control v alve

12 Liquid injection

13 3-way head pressure control valve

14 Check valv e

15 Pressure-balancing valve

16 Sight glass

17 Pressure relief valve

18 Lee-Temp receiver

19 Receiver-heater pressure-limitingswitch

20 Liquidline solenoid v alve

21 Liquid line

To evacuate and leak test the system:

1. Open the liquid line solenoid valve and hot gas bypass solenoid valve by removing the holding coils, and apply
a solenoid valve service magnet to the valves.

2. Connect manifold gauge hoses on the discharge and suction line Schrader ports, open the service valves, and
place a 150Psig(1034kPa)charge of dry nitrogen with a tracer of refrigerant, then check the system for leaks
with a suitable leak detector.

3. After completion of leak testing, release the test pressure, (observe local code) and pull an initial deep vacuum
of 500microns on the system with a suitable pump.

4. After fourhours, check the pressure readings and, if they have not changed, break vacuum with dry nitrogen.
Pull a second and third vacuum to 500 microns or less. Re-check the pressure after twohours.
When the three checks are complete, proceed to Charging Air Cooled Systems on the facing page.

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5.3.3 Charging Air Cooled Systems

NOTICE

Risk of improper refrigerant charging. Can cause equipment damage.

R-407C is a blended refrigerant and must be introduced and charged from the cylinder only as a liquid.

When adding liquid refrigerant to an operating system, it may be necessary to add the refrigerant through the
valve in the compressor suction line. Care must be exercised to avoid damage to the compressor. We
recommend connecting a sight glass between the charging hose and the compressor suction service valve.
This will permit adjustment of the cylinder hand valve so that liquid can leave the cylinder while allowing vapor
to enter the compressor.

To calculate the charge for the system:

1. Check the nameplate on the indoor unit for refrigerant type to use.

2. Refer to R-407C Refrigerant Unit Charge on page45, and Table 5.9 on page46, and calculate the amount of
charge for the system including the evaporator, condensing unit, and interconnecting piping.

3. Accurately weigh-in as much of the system charge as possible before re-installing coils on liquid line solenoid
valve and hot gas bypass solenoid valve, and starting the unit.

5.3.4 Field Charge Verification forAir Cooled Systems

An integral sight glass is provided with the receiver to assist in field charge verification. During charge verification, set the
control temperature down to keep the system running. If the system is equipped with hot gas bypass, de-energize it by
removing power from the hot gas solenoid valve coil. To remove power, disconnect the solenoid leads from the unit
contactor in the electric box, see Figure 5.2 on page47. When charge verification is complete, replace and secure all wire
connections and covers.

During operation at design ambient temperatures, (95 or 105°F; 35 or 41°C) the charge level is above the sight glass in the
receiver. If levels are below the sight glass, an undercharge condition is likely. If levels are above the sight glass and higher
discharge pressures than normal are observed, an overcharge condition may be likely. However, verify that other high
discharge pressure causes such as dirty coil and restricted air flow are not responsible before removing charge.

At temperatures below design ambient temperature, refrigerant backs into the condenser coil and the level in the receiver
drops below the sight glass. If you are trying to verify charge level at lower ambient temperatures, block the condenser coil
to maintain 240psig (1655kPa) discharge pressure to ensure the head pressure control valve is closed. At these conditions,
the charge level should be above the sight glass in the receiver.

NOTE: If no level is visible in the sight glass, add charge until the level is in the middle of the sightglass. Check the
discharge pressure during this procedure and adjust coil restrictions to maintain 240psig(1655kPa). Once the
charge is in the middle of the sight glass, add additional system charge per Table 5.10 on the next page. After
charging, unblock the coil and allow the unit to operate normally. After conditions have stabilized, restrict the coil if
required to maintain 240psig(1655kPa) discharge pressure and verify that the charge level is above the sight glass.

5 Pip ing and Refrigeran t Requirements

49

Table 5.10 Field Verification Charge Addition

Model Numb ers R-407C

60 Hz 50 Hz oz (kg)

PFH020A-_L — 4 (0.1 1)

PFH027A-_L — 4 (0.11 )

MCD24AL_HN — 4 (0. 11)

PFH027A-_H — 18 (0.51)

PFHZ27A-_L — 1 8 (0. 51)

PFH037 A-_L PFH036A-_L 18 (0.51)

MCD36AL_HN — 18 (0.51)

PFH037 A-_H PFH036A-_H 8 (0.23)

PFHZ37A-_L PFHZ36A-_L 8 (0. 23)

See Table 5. 8 on page45, for base charge amount of the condensing unit.

5.3.5 Documenting Refrigerant Charge on Air Cooled Units

When the unit is charged, you must record the total system charge value on the condensing unit's serial tag. The total
system charge includes the evaporator, condensing unit, and interconnecting lines.

5.3.6 Evacuation and Leak Testing Water/Glycol Cooled Systems

For proper leak check and evacuation, you must open all system valves and account for all check valves, see Figure 5.3 on
the facing page.

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Vertiv | Liebert® DataMate™ Installer/User G uide

Figure 5.3 Valves and Connections for Remote Water/Glycol Condensing Unit

5 Pip ing and Refrigeran t Requirements

51

Item Description

1 Apply a manifold gauge hose on the suction line Schrader port.

2 Apply a manifold gauge hose on the discharge line Schrader port.

3 Unplug the wires and remove the solenoidvalve holding coil, then apply a solenoid va lve service magnet to the valve.

4 Suction line

5 Liquidinjection va lve bulb

6 Schrader port with valve core

7 Scroll compressor

8 High pressure switch

9 Tube-in-tube condenser

10 Hot gas bypass solenoid valve

11 Hot gas bypass control valve

12 Liquidinjection

13 Liquid line

14 Water/Glycol return line

15 Fluid return from unit

16 Shut-off valves (required, field-supplied)

17 Hose bibs(required, field-supplied)

18 Fluid supply to unit

19 2-way water regulating valve

20 Water/Glycol supply line

21 3-way water regulating valve (optional)

To evacuate and leak test the system:

1. Open the hot gas bypass solenoid valve by removing the holding coil, and apply a solenoid valve service
magnet to the valve.

2. Connect a manifold gauge hose on the discharge and suction line Schrader ports, open the service valve, and
place a 150Psig(1034kPa)charge of dry nitrogen with a tracer of refrigerant, then check the system for leaks
with a suitable leak detector.

3. After completion of leak testing, release the test pressure, (observe local code) and pull an initial deep vacuum
of 500microns on the system with a suitable pump.

4. After fourhours, check the pressure readings and, if they have not changed, break vacuum with dry nitrogen.
Pull a second and third vacuum to 500 microns or less. Re-check the pressure after twohours.
When the three checks are complete, proceed to Charging Water/Glycol Cooled Systems below.

5.3.7 Charging Water/Glycol Cooled Systems

NOTICE

Risk of improper refrigerant charging. Can cause equipment damage.

R-407C is a blended refrigerant and must be introduced and charged from the cylinder only as a liquid.

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Vertiv | Liebert® DataMate™ Installer/User G uide

When adding liquid refrigerant to an operating system, it may be necessary to add the refrigerant through the
valve in the compressor suction line. Care must be exercised to avoid damage to the compressor. We
recommend connecting a sight glass between the charging hose and the compressor suction service valve.
This will permit adjustment of the cylinder hand valve so that liquid can leave the cylinder while allowing vapor
to enter the compressor.

To calculate the charge for the system:

1. Check the nameplate on the indoor unit for refrigerant type to use.

2. Refer to R-407C Refrigerant Unit Charge on page45, and Table 5.9 on page46, and calculate the amount of
charge for the system including the evaporator, condensing unit, and interconnecting piping.

3. Accurately weigh-in as much of the system charge as possible before re-installing the coil on the hot gas
bypass solenoid valve and starting the unit.

5.3.8 Optimizing Refrigerant Charge on Water/Glycol Units

1. Operate the unit at full heat load, normal room conditions and normal water/glycol fluid temperatures for a
minimum of 30 minutes before measuring stable unit superheat and sub-cooling temperatures and adjusting
charge levels.

• Condensing temperatures should be in range of 100 to 130°F (38 to 54°C) depending on fluid type and
fluid temperature.

• Full heat load is required to stabilize the system.

2. Attach pressure and temperature instruments to the liquid line of the condensing unit. Use the factory installed
Schrader valve located in the liquid line of the condenser. Measure the initial sub-cooling.

NOTE: To determine sub-cooling measurement, a liquid line pressure reading (at the factory installed Schrader tap)
must be measured along with the temperature reading on the liquid line. Convert the liquid line pressure reading into
a liquid temperature by utilizing a pressure temperature guide. Subtract the measured temperature from the liquid
saturation temperature. The difference is sub-cooling.

3. Adjust refrigerant charge levels as needed to achieve sub-cooling range of 12 to 14°F (6.7to7.8°C) while
maintaining full load conditions.

5.3.9 Documenting Refrigerant Charge on Water/Glycol-cooled Units

When the unit is charged, you must record the total system charge value on the condensing unit's serial tag. The total
system charge includes the evaporator, condensing unit, and interconnecting lines.

5 Pip ing and Refrigeran t Requirements

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6 ELECTRICAL CONNECTION REQUIREMENTS

WARNING! Arc flash and electric shock hazard. Open all local and remote electric power supply disconnect
switches, verify with a voltmeter that power is Off and wear appropriate, OSHA approved personal protective
equipment (PPE) per NFPA 70E before working within the 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 Liebert® controller does
not isolate power from the unit, even in the Unit Off mode. Some internal components require and receive
power even during the Unit Off mode of the controller. 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 improper wire and loose electrical connections. Can cause overheated wire and electrical
connection terminals resulting in smoke, fire, equipment and building damage, injury or death. Use correctly
sized copper wire only and verify that all electrical connections are tight before turning power On. Check all
electrical connections periodically and tighten as necessary.

NOTE: Seal openings around piping and electrical connections to prevent air leakage. Failure to do so could reduce
the unit's cooling performance.

NOTICE

Risk of improper electrical supply connection. Can cause equipment damage.

See transformer label for primary tap connections. Installer will need to change transformer primary taps if
applied unit voltage is other than pre-wired tap voltage.

All power and control wiring and ground connections must be in accordance with the National Electrical Code and local
codes. Refer to the equipment serial tag data for electrical requirements.

A manual electrical disconnect switch should be installed in accordance with local codes and distribution system. Consult
local codes for external disconnect requirements.

Each unit is shipped from the factory with internal wiring completed. Refer to the unit's electrical schematic when making
connections. Electrical connections to be supplied by the users and made at the installation site are:

• Power supply to the evaporator or chilled water unit.

• Power supply to the condensing unit.

• Power supply to outdoor condensing unit, if applicable.

• Control wiring (shielded) between the evaporator unit and condensing unit, if applicable.

• Control wiring (shielded) between the control panel (wall box) and the evaporator or chilled water unit's control
board.

The electrical connections are described in the submittal documents included in the Submittal Drawings on page107.

The following table lists the relevant documents by number and title.

6 Electrical Connection Requirements

55

Table 6.1 Electrical Field Connection Drawings

Docu ment Number Title

Evaporator and Chilled Water Units

DPN000264 Electrical Connections, Evaporator and Chilled Water Units

DPN000271 Electrical Connections, Close Coupled Water/Glycol Cooled Units

DPN004912 Arrangement and Dimensions, IS-UNITY-DP for BMS Communication

DPN004854 Electrical Connections, IS-UNITY-DP for BMS Communication

Split System IndoorCondensing Units

DPN000207 Electrical Connections, Air Cooled Condensing Units

DPN000209 Electrical Connections, Water/Glycol Cooled Condensing Units

6.1 Input Power Connection Requirements

WARNING! Risk of loose electrical connections. Can cause overheating of wire, smoke and fire resulting in

building and equipment damage, injury or death. Use copper wiring only. Verify that all connections are
tight.

NOTE: Refer to specifications for full load amp. and wire size amp. ratings.

Voltage supplied must agree with the voltage specified on the unit serial tag. An optional transformer is available for
277-VAC, single phase supply power applications, see DPN000647 in the Submittal Drawings on page107. A field supplied
disconnect switch is required to isolate the unit for maintenance.

Route the supply power to the disconnect switch, then to the unit. Route the conduit through the hole provided in the
cabinet. Connect earth ground to lug provided.

NOTE: When installing a close coupled water/glycol cooled condensing unit, connect the line voltage supply to the
condensing unit. The evaporator is powered from the condensing unit with a factory supplied interconnecting cable.

The power terminal connections are labeled L1and L2. See transformer label for primary tap connections. Installer will need
to change transformer primary taps if applied unit voltage is other than pre-wired tap voltage. For 208-VAC applications,
input transformer connection must be changed. Refer to the electrical schematic.

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6.2 Control Wiring Connection Requirements

6.2.1 Wall Box Controller Control Connections

A four conductor (thermostat type) field supplied, shielded wire must be connected between the evaporator control board
and the wall box display. Refer to the appropriate submittal drawings for your system for electrical connections. See Table

6.1 on the previous page.

6.2.2 Split System Condensing Unit Control Connections

A field supplied, shielded, four wire control connection (24 VAC) is required between the evaporator and the condensing
unit.

Control wiring must be installed in accordance with the National Electrical Code (NEC) Class 1 circuit according to wire
routing conditions chosen and local codes. Water/Glycol cooled units require a Class 1 circuit. If installing a glycol unit, see

Water/Glycol Cooled Unit Control Connections below, for specific requirements.

Control wiring between the evaporator and the condensing unit must be shielded and sized for a voltage drop of less than
1volt, see Table 6.2 below, for recommended minimumgauge by distance. Connect the shield wire to earth (ground) at
the Liebert® equipment. Avoid running the low voltage connections near high voltage lines or loads such as light ballasts.

NOTE: Do not connect additional electrical devices to the control circuit. The circuit breaker in the transformer is only
sized for factory supplied components. Refer to the appropriate submittal drawings for your system for electrical
connections. See Table 6.1 on the previous page.

Table 6.2 Recommended Minimum Wire Size

Maximum Distance,* ft (m) Min imum Wire Gauge, A WG(mm2)

50 (15) 20 (0.75)

75 (23) 18 (1.0)

100 (30) 1 8 (1. 0)

150 (45) 16 (1.5)

* One-way control wire run between outdoor condensing unit and ev aporator.

6.2.3 Water/Glycol Cooled Unit Control Connections

Glycol cooled units require an additional field supplied, two conductor (thermostat type) wire connection between the
evaporator unit and the drycooler. Units with water tower loops can be wired for circulation pump/valve requirement. A
Class 1 circuit is required for water/glycol units. Control wiring must be installed in accordance with NEC and local codes.
Refer to the appropriate submittal drawings for your system for electrical connections. See Table 6.1 on the previous page.

6.2.4 Additional Control Connections

If your system includes other optional monitoring and control devices, additional control wiring will be required.

6 Electrical Connection Requirements

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7 CHECKLIST FOR COMPLETED INSTALLATION

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 refrigerant or coolant loop (if required). Refrigerant charge added.

4. Condensate pump installed (if required).

5. Drain line(s) connected and checked for leaks.

6. Water supply line connected to humidifier (if required). Routed to allow air filter removal.

7. All piping connections are checked for leaks. (Correct as required.)

8. Safety drain pan installed under water/glycol cooled condensing units.

9. Drain pan installed under cooling and ceiling mounted condensing unit.

10. Filter box installed on ducted units.

11. Ducting completed, if required.

12. Line voltage to power wiring matches equipment serial tag.

13. Power wiring connections completed between disconnect switch, evaporator, and condensing unit, including
earth ground.

14. Power line circuit breakers or fuses have proper ratings for equipment installed.

15. Wall mounted control is mounted and wired to the cooling unit.

16. Shielded control wiring connections used and completed to evaporator and condensing unit (if required),
including wiring to wall mounted control panel and optional controls.

17. Control panel DIP switches set based on customer requirements.

18. All wiring connections are tight.

19. Foreign materials have been removed from inside and around all equipment installed (shipping materials,
construction materials, tools, etc.)

20. Fans and blowers rotate freely without unusual noise.

21. Inspect all piping connections for leaks during initial operation. Correct as needed.

22. Rubber band is removed from evaporator condensate pan float switch.

23. Monitored water detection system installed for unit, water supply/return lines, and condensate drain line.

7 Ch ecklist for Completed Ins tallation

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8 INITIAL START-UP CHECKS ANDCOMMISSIONINGPROCEDURE
FORWARRANTYINSPECTION

WARNING! Arc flash and electric shock hazard. Open all local and remote electric power supply disconnect
switches, verify with a voltmeter that power is Off and wear appropriate, OSHA approved personal protective
equipment (PPE) per NFPA 70E before working within the 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 Liebert® controller does
not isolate power from the unit, even in the Unit Off mode. Some internal components require and receive
power even during the Unit Off mode of the controller. 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 improper wiring, piping, moving, lifting and handling. Can cause equipment damage,
serious injury or death. Installation and service of this equipment should be done only by qualified personnel,
wearing appropriate, OSHA approved PPE, who have been specially trained in the installation of air
conditioning equipment.

• Confirm that all items on Checklist for Completed Installation on page59, have been done.

• Locate “Liebert® DataMate Warranty Inspection Check Sheet” in the unit’s electric panel. (PSWI-8542-403RE).

• Complete “Liebert® DataMate Warranty Inspection Check Sheet” during start-up. (PSWI-8542-403RE).

• Forward the completed “Liebert® DataMate Warranty Inspection Check Sheet” to your local sales office. This
information must be completed and forwarded to validate warranty.

• Contact your local sales representative or technical support if you have any questions or problems during unit
start-up and commissioning. Visit https://www.vertiv.com/en-us/support/ or call 1-800-543-2778 for contacts.

8 Initial Start-up Checks andCommissi oning Procedure forWarrantyInspection

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9 MICROPROCESSOR CONTROL

The Microprocessor Control for the Liebert® DataMate features a menu driven LCD. The menus, control features, and circuit
board are described in this section. Detailed information concerning controls (System Control and Performance on page80)
and alarms (Alarm Notification, Acknowledgment, and Descriptions on page81) are provided.

9.1 Controller Operation

Setpoints, DIP switch settings and other selections were made during factory testing of your unit and are based upon typical
operating experience. Other default selections were made according to options included with your unit.

NOTE: Only make adjustments to the factory default settings if they do not meet your specifications.

When adjusting setpoints and configuration, allowable ranges are displayed by pressing the help key. If enabled, a password
is required to change setpoints, time delays, and other settings.

The default display normally shows the present room temperature, humidity, active status functions (cooling, heating,
dehumidifying, humidifying), fan speed, and active alarms.

The controller includes an LCDdisplay and eight buttons to navigate the display.

Figure 9.1 Control Keys on the Wall Mounted Display

9 Microprocessor Control

Item Description

1 I/O (On/Off)

2 Menu, displays program menu.

3 Up arrow, increases parameter value in a settings mode.

4 Escape, backs up to a preview menu.

5 Enter, saves settings/changes.

6 Downarrow, decreases param eter value in a settings mode.

7 Alarm Silence/Help, silences active alarm(s). Displays help text when there is no alarm.

8 HI/LO, selects fans speed.

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9.1.1 Powering On/Off with Wall Mounted Display

To power on the system:

Press I/O after power is applied.

To power off the system:

Press I/O before power is disconnected.

9.1.2 Silencing an Audible Alarm

Active alarms are displayed on the LCD screen and sound an audible beeper.

To silence an audible alarm:

Press the Alarm Silence/Help button.
The alarm notification remains visible on the LCD screen.

9.2 Main Menu <MENU>

The menu options are shown in Figure 9.2 on page66. The options differ only slightly depending on the size of the unit.
The differences are noted in the option descriptions.

To select a menu option:

1. Press the MENU key.

2. Use the Up/Down arrows to highlight a selection, then press Enter.

Main Menu Options

SETPOINTS

See Editing Setpoints on page67.

STATUS

See Viewing Unit Status on page67.

ACTIVE ALARMS

See Viewing Active Alarms on page68.

TIME

See Setting Controller Time on page68.

DATE

See Setting Controller Date on page68.

SETBACK

See Programming Setback on page68.

SETUP OPERATION

See Editing Setup Operation on page69

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SETPOINT PASSWORD

See Changing Setpoint and Setup Passwords on page71

SETUP PASSWORD

See Changing Setpoint and Setup Passwords on page71.

CALIBRATE SENSORS

See Calibrating Sensors and Setting Sensor Response Delay on page71.

ALARM ENABLE

See Enabling/Disabling Alarms on page72.

ALARM TIME DELAY

See Setting Alarm Delays on page72.

COMMON ALARM ENABLE

See Activating the Common Alarm Relay on page73.

CUSTOM ALARMS

See Configuring Custom Alarms on page74.

CUSTOM TEXT

See Customizing Alarm Message Text on page74.

DIAGNOSTICS

See Running Diagnostics on page76.

9 Microprocessor Control

65

Figure 9.2 Control Menu Example

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9.2.1 Editing Setpoints

Setpoints are kept in non-volatile memory. The setpoint options are:

• TEMPERATURE SETPOINT

• TEMPERATURE SENSITIVITY

• HUMIDITY SETPOINT

• HUMIDITY SENSITIVITY

• HIGH TEMPERATURE ALARM

• LOW TEMPERATURE ALARM

• HIGH HUMIDITY ALARM

• LOW HUMIDITY ALARM

Table 9.1 below, lists the default setting and allowed range for each setpoint.

Table 9.1 Default Setpoints and Allowable Ranges

Setpoint Default Range

Temperature Setpoint 72°F 40-90°F (5-32°C)

Temperature Sensitivity 2.0°F 1 -9.9°F (0.6-5.6°C)

Humidity Setpoint 50% 20-80% RH

Humidity Sensitivity 5% 1 -30% RH

High Temperature Alarm 80°F 35-95°F (2-35°C)

Low Temperature Alarm 65°F 35-95°F (2-35°C)

High Humidity Alarm 60% 15-85% RH

Low Humidity Alarm 40% 1 5-85% RH

To adjust a setpoint:

1. Press the MENU key.

2. Use the Up/Down arrows to highlight SETPOINTS, then press Enter.

3. Use the Up/Down arrows to highlight a setpoint option, then press Enter.

4. Use the Up/Down arrows to change the value, then press Enter to store the value.

9.2.2 Viewing Unit Status

The Status options displays percentage heating, cooling, dehumidifying and humidifying status of the unit

To view the unit status:

1. Press the MENU key.

2. Use the Up/Down arrows to highlight STATUS, then press Enter.

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67

9.2.3 Viewing Active Alarms

Alarms display on the LCD as No Alarm Present or Alarm XX of YY, where XX is the number of the alarm and YY is the total
number of active alarms.

To view active alarms:

1. Press the MENU key.

2. Use the Up/Down arrows to highlight ACTIVE ALARMS, then press Enter.

3. If there is more than one active alarm, use the Up/Down Arrows to scroll through the alarms list.

9.2.4 Setting Controller Time

The controller time clock must be set to allow for the setback control. The clock uses the 24-hour system (that is, 12
midnight is entered as 24:00).

To set the time:

1. Press the MENU key.

2. Use the Up/Down arrows to highlight TIME, then press Enter.

3. Use the Up/Down arrows to change the each character, pressing Enter to store it and move to the next
character.

NOTE: Date and Time features have a battery backup.

9.2.5 Setting Controller Date

The controller date must be set to allow for the setback control.

To set the date:

1. Press the MENU key.

2. Use the Up/Down arrows to highlight DATE, then press Enter.

3. Use the Up/Down arrows to change each character, pressing Enter to store it and move to the next character.

NOTE: Date and Time features have a battery backup.

9.2.6 Programming Setback

The microprocessor can be programmed for night and weekend setback. Two events can be programmed for a five day
work week and two events can be programmed for a two day weekend. Use Table 9.2 on the facing page, to devise a
setback plan.

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To program a setback plan:

1. Press the MENU key.

2. Use the Up/Down arrows to highlight SETBACK, then press Enter.

3. Use the Up/Down arrows to change the values, then press Enter to store the value.

Table 9.2 Night and Weekend Setback Plan

Event Weekend Weekday

Time 1

Temperature 1

Sensitivity 1

Humidity 1

Humidity Sensitivity 1

Time 2

Temperature 2

Sensitivity 2

Humidity 2

Humidity Sensitivity 2

9.2.7 Editing Setup Operation

System set-up parameters are kept in non-volatile memory.

To edit the setup:

1. Press the MENU key.

2. Use the Up/Down arrows to highlight SETUP OPERATION, then press Enter.

3. Use the Up/Down arrows to highlight a setup option, then press Enter.

4. Use the Up/Down arrows to change the value, then press Enter to store the value.

Table 9.3 below, lists the default setting and allowed range for each function.

Table 9.3 Setup Functions, DefaultValuesandAllowableRanges

Fun ction Default Range

Restart Time Delay 0.1 min

C/F Degrees

Humidity Control Rel Relative or Absolute

°F °Cor °F

0 to 9.9 min

(0 = m anual restart)

9 Microprocessor Control

69

Setup options

RESTART TIME DELAY

Selects a delay before restarting the unit after main power is restored to the unit.

• Delay can be set from 0.1 minutes (6 seconds) to 9.9 minutes.

• If several units are operating, set different delays for a sequential start up.

• Setting the value to zero (0) prevents unit restart when power is restored. In this case, the unit must be
restarted manually by pressing the On/Off button on the keypad.

C/F DEGREES

Selects Fahrenheit (F) or Celsius (C) for display readings/setpoints.

HUMIDITY CONTROL METHOD

Selects relative (direct) or absolute (predictive) for humidity control. The LCD displays the percentage relative
humidity for both methods of control and if absolute is selected, the adjusted humidity reading is also displayed.

• If relative is selected, the RH control is taken directly from the RH sensor.

• If absolute is selected, the RH control automatically adjusts when return air temperature deviates from the
desired temperature setpoint (i.e., predictive humidity control). Predictive humidity control automatically
adjusts the humidity level ~2% RH for each degree difference between the return air temperature and the
temperature setpoint.

For more details about selecting the humidity control method, see Humidity Control and Overcooling below.

Humidity Control and Overcooling

When using the relative (direct) humidity control method, unnecessary dehumidification can result when overcooling occurs
during a dehumidification cycle. This happens when a higher than normal RH reading is caused by overcooling the room
(about 2% RH for each degree of overcooling). This temperature drop extends the dehumidification cycle. Later, when
dehumidification ends and the temperature rises to the setpoint, the RH reading falls to a reading lower than actually
desired. If the temperature drop is significant enough, the percentage RH could be low enough to activate the humidifier.

Using the absolute (predictive) humidity method may avoid over dehumidification. When overcooling causes an increase in
the RH reading, the humidity control program estimates what the RH will be when the dehumidification cycle ends and
temperature returns to the setpoint and allows the dehumidification cycle to end at the proper time. Predictive humidity
control can greatly reduce energy consumption by minimizing compressor/reheat operation and eliminating unnecessary
operation.

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9.2.8 Changing Setpoint and Setup Passwords

When you attempt to make changes, the display prompts you for a three digit password. The passwords provide system
security, so that only authorized personnel may make changes. If unauthorized changes occur, the passwords may be
compromised and new ones should be set.

The system includes two passwords with the following factory default settings:

• Default setup password = 3 - 2 - 1

• Default setpoint password = 1 - 2 - 3

To change a password:

First enter the default password, then enter the new password.

NOTE: The password function can be disabled by setting DIP switch 8 in the wall box to OFF and then cycling power
to the unit.

9.2.9 Calibrating Sensors and Setting Sensor Response Delay

If you suspect that the temperature and/or humidity readings are not accurate, you can calibrate the sensors to match the
display using your portable, calibrated test instrument and the CALIBRATE SENSORS menu. The temperature sensor can
be calibrated +5°F. The humidity sensor can be calibrated ±10% RH.

If the sensors are subject to frequent wide temperature and humidity swings, it may be necessary to shorten the cycling by
increasing the sensor time delay. If the sensors are located too close to the air discharge, they will likely experience rapid
swings in measurement. Another method in reducing compressor cycling is to increase the temperature and/or humidity
sensitivity.

The calibration and delay options are:

• SET TEMP CAL—calibrates the temperature sensor ±5°F (±2.8°C).

• SET HUM CAL—calibrates the humidity sensor ±10%.

• SET TEMP DELAY—sets the time delay for sensor response 10to 90seconds (default setting = 50 seconds).

• SET HUMID DELAY—sets the time delay for sensor response 10to 90seconds (default setting = 50 seconds).

To calibrate a sensor:

1. Make sure the unit is operating and has maintained stable operating conditions for at least 15 minutes.

2. Place the test instrument as close as possible to the sensors to obtain an accurate reading for comparison.

3. At the controller, press the MENU key.

4. Use the Up/Down arrows to highlight CALIBRATE SENSORS, then press Enter.

5. Use the Up/Down arrows to highlight a calibration option, then press Enter.

6. Use the Up/Down arrows to adjust the unit's sensor reading to match the reading from the test device, then
press Enter to store the value.

IMPORTANT! When calibrating the humidity sensor, the calibration value is always displayed in % RH, even when
absolute humidity control is selected for the unit. If absolute humidity control is selected, the Normal Status Display
displays the adjusted reading, which may not agree with the relative humidity reading that displays in calibration.

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71

To set sensor response time delay:

1. Press the MENU key.

2. Use the Up/Down arrows to highlight CALIBRATE SENSORS, then press Enter.

3. Use the Up/Down arrows to highlight a set delay option, then press Enter.

4. Use the Up/Down arrows to adjust the delay, then press Enter to store the value.

9.2.10 Enabling/Disabling Alarms

Many individual alarms may be enabled or disabled. When enabled, an alarm annunciates audibly, visibly, and
communicates to a connected site monitoring system. When disabled, the alarm is completely ignored.

The alarms available for adjustment are:

• Custom Alarm #1

• Custom Alarm #2

• High Temperature

• Low Temperature

• High Humidity

• Low Humidity

• Short Cycle

• Loss of Power

To set enable or disable an alarm:

1. Press the MENU key.

2. Use the Up/Down arrows to highlight ALARM ENABLE, then press Enter.

3. Use the Up/Down arrows to highlight an alarm option, then press Enter.

4. Use the Up/Down arrows to enable/disable, then press Enter to store the value.

NOTE: When the alarm is disabled it will not report to the wall box or the common alarm relay.

NOTE: Even when the high water alarm is disabled, the unit automatically shuts off when a high water incident
occurs.

NOTE: The standard, factory installed high water alarm and high head pressure alarms cannot be disabled.

9.2.11 Setting Alarm Delays

For each alarm, you can set an amount of time to delay the notification after an alarm condition occurs. If the alarm condition
resolves before the delay elapses, there is no alarm notification and the time delay resets automatically. The delay may be
set for 0to 255 seconds, in one second intervals. Table 9.4 on the facing page, lists each alarm and the default delay
setting.

NOTE: Software alarms such as loss of power and short cycle, should be left at the factory default of 0.

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To set alarm delay times:

1. Press the MENU key.

2. Use the Up/Down arrows to highlight ALARM TIME DELAY, then press Enter.

3. Use the Up/Down arrows to highlight an alarm option, then press Enter.

4. Use the Up/Down arrows to select the delay, then press Enter to store the value.

5. Repeat steps 3 and 4 for each alarm delay to set.

Table 9.4 Default Alarm Delay Times

Alarm Default Time Delay, seconds

Hum Prob 2

High Head Pressure 2

Custom Alarm #1 0

Custom Alarm #2 6

High Temperature 30

Low Temperature 30

High Humidity 30

Low Humidity 30

Short Cycle 0

Lossof Power 0

NOTE: The delay for the standard, factory installed high head pressure alarm is not adjustable.

9.2.12 Activating the Common Alarm Relay

Each alarm can be set to activate the common alarm relay. The common alarm relay is K5. See Enabling/Disabling Alarms
on the previous page, for the list of available alarms.

When set to YES (enabled), the relay energizes immediately when the alarm annunciates and de-energizes when the alarm
is acknowledged. When set to NO (disabled), an alarm has no effect on the common alarm relay.

To set an alarm to trigger the common alarm relay:

1. Press the MENU key.

2. Use the Up/Down arrows to highlight COMMON ALARM ENABLE, then press Enter.

3. Use the Up/Down arrows to highlight an alarm option, then press Enter.

4. Use the Up/Down arrows to select YES/NO, then press Enter to store the value.

5. Repeat steps 3 and 4 for each alarm needed to activate the common alarm.

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73

9.2.13 Configuring Custom Alarms

You can select custom alarm messages from a list of standard messages or you can create up to two custom text messages
for selection. The following are the messages available for custom alarms:

• Filter Clog

• Humidifier Problem

• Water Flow Loss

• Loss of Air Flow

• Custom Text #1 (See Customizing Alarm Message Text below to create a custom message.)

• Custom Text #2 (See Customizing Alarm Message Text below to create a custom message.)

To select the message for a custom alarm:

1. Press the MENU key.

2. Use the Up/Down arrows to highlight CUSTOM ALARMS, then press Enter.

3. Use the Up/Down arrows to highlight the alarm, then press Enter.

4. Use the Up/Down arrows to select the message, then press Enter to store the value.

9.2.14 Customizing Alarm Message Text

IMPORTANT! If using custom text messages, notify maintenance personnel of the alarm function and required action.

You can create custom messages for your custom alarms up to 20 characters in length including blank spaces or any of the
following alphanumeric characters and symbols:

A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S, T, U, V, W, X, Y, Z

#, %, *, -

0,1, 2, 3, 4, 5, 6, 7, 8, 9

To create custom text message:

1. Press the MENU key.

2. Use the Up/Down arrows to highlight CUSTOM TEXT, then press Enter.

3. Use the Up/Down arrows to highlight the custom text option, then press Enter.

4. Use the Up/Down arrows to select the character, press Enter to store the value until the entire message is
stored.

5. To use the custom message, select it from the CUSTOMALARMS menu. See Configuring Custom Alarms
above.

9.2.15 LCD Display Contrast

You can adjust the level of contrast to help with the viewing angle of the LCD disposal using a potentiometer screw inside
the wall box next to the display.

9.2.16 Non-volatile Memory

All critical information is stored in nonvolatile memory. Setpoints and setup parameters are kept inside the microcontroller
in EEPROM.

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9.2.17 Equipment Options DIP Switches

Equipment options are selected and enabled using a set of DIP switches mounted on the control board inside the ceiling
mounted evaporator. The switches are factory set and should not be changed.

The switch settings on the control board are recognized by the microprocessor control and may be reviewed in the LCD
display. Table 9.5 below, show the setting options. See Editing Setup Operation on page69, to review the settings on the
display.

Figure 9.3 on page78 shows the DIP switches on control board in the evaporator unit. Figure 9.4 on page79shows the
DIP switches on control board in the wall mounted controller.

NOTE: To update the DIP switch settings, power must be cycled Off, then On from the unit disconnect switch.

Table 9.5 Equipment Option DIP Switch Settings (onUnit Control Board)

Switch OF F Position ON Position

1 Compressor Chill Water

2 Not Used. Must remain in OFFposition.

3 Not Used. Must remain in OFF position.

4 Not Used. Must remain in OFF position.

5 Enable Reheat Disable Reheat

6 Enable Humidifier Disable Humidifier

7 Enable Dehumidifier Disable Dehumidifier

8 Not Used. Must remain in OFFposition.

Table 9.6 DIP Switch Settings onWall Box Board

Switch OF F Position ON Position

1 Beeper Disable Beeper Enable

2 Not Used. Must remain in OFF position.

3 Not Used. Must remain in OFF position.

4 Not Used. Must remain in OFF position.

5 Not Used. Must remain in OFF position.

6 Not Used. Must rema in in OFF position.

7 Disable Setback Enable Setback

8 Enable P assword Disable Password

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9.3 Running Diagnostics

Using the diagnostics tools, you can view system inputs and outputs and test the microcontroller without interrupting
normal operation of the unit. Testing system outputs temporarily suspends normal system control and operation.

9.3.1 Showing Test Inputs

You can view the input state of the devices listed in Table 9.7 below, with the unit on and the fan running.

To show the test inputs:

1. Press the MENU key.

2. Use the Up/Down arrows to highlight DIAGNOSTICS, then press Enter.

3. Use the Up/Down arrows to highlight TEST INPUTS, then press Enter.

4. Use the Up/Down arrows to scroll through the inputs list.

Table 9.7 Test Inputs

Input Circuit Normal Status

High Water Alarm O ff unless High Water Alarm is active.

High Head Pressure
Alarm

Custom ala rm #1 Off unless this special c ustomer selectable alarm is active.

Custom ala rm #2 Off unless this special customer selectable alarm is active.

Power

Off unless High Head Pressure Alarm is active.

On unless unit is turnedoff throughthe wall box or any of the following optional devices: high temperature sensor, smoke detector,
High Water Alarm or Remote Shutdown.

9.3.2 Testing Outputs

NOTICE

Risk of overheating the compressor during the Test Output mode. Testing the compressor output for more than
a few seconds can cause compressor damage.

Extended unit operation in the Test Outputs mode may damage the unit. Do not operate the unit in the Test
Outputs mode any longer than is necessary for troubleshooting.

NOTICE

Risk of extended unit operation in the test outputs mode for troubleshooting. Can cause damage to the unit.

Do not operate unit in the test outputs mode any longer than is necessary for troubleshooting.

The outputs available are:

• Normal fan:normal speed fan contactor

• Low Speed Fan: low speed fan contactor (on direct drive blower units only)

• Humidifier: steam humidifier contact (if present)

• Cool: compressor contactor or chilled water valve

• HGBP: hot gas bypass valve (if present)

• Reheat: reheat contactor (if present)

• Common Alarm: common alarm relay

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When testing outputs, the unit is effectively turned off. When stepping from one load to the next, the previous load is
automatically turned off if it was on.

NOTE: Compressor is limited to 15 seconds On to prevent damage.

NOTE: When testing outputs, the fan is turned On with all loads. After six minutes without user input, the controller
automatically exits test output mode and returns to normal operation.

To test the outputs:

1. Press the MENU key.

2. Use the Up/Down arrows to highlight DIAGNOSTICS, then press Enter.

3. Use the Up/Down arrows to highlight TEST OUTPUTS, then press Enter.

4. Use the Up/Down arrows to highlight the output to test, the press Enter to toggle the load on/off.
The output remains for fiveminutes unless toggled Off, when you step to the next load, or when you exit the test
outputs function.

9.3.3 Testing the Microcontroller

When selected, the microcontroller performs a self-test that lasts approximately 10seconds. When the test is complete, the
display shows the ROM checksum, ROM part number, and the firmware revision number.

To test the microcontroller:

1. Press the MENU key.

2. Use the Up/Down arrows to highlight DIAGNOSTICS, then press Enter.

3. Use the Up/Down arrows to highlight TEST MICROCONTROLLER, then press Enter.

Figure 9.3 on the next page, shows the control board in the evaporator unit. Figure 9.4 on page79,shows the
connections on control board in the wall mounted controller.

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Figure 9.3 Control Board Inside the Evaporator

Item Description

1 DIPswitches 1 – 8

Table 9.8 Connections/Functions ofControlBoardInsideEvaporator

Connection F unction Connection F unction

TB2-4 Hot Gas Bypass TB1-2 Customer Alarm Connection #1

TB2-3 High Head Alarm Connection TB1 -1 Customer Alarm Connection (Common)

TB2-2 Heat Rejection (24 VAC+) TB3-4 Connection to Terminal #4 Wall B ox

TB2-1 Heat Rejection (24 VAC GND) TB3-3 Connection to Terminal #3 Wall Box

TB1-9 Condensate Pump Aux Alarm TB 3-2 Connection to Terminal #2 Wall Box

TB1-8 Condensate Pump Aux Alarm TB3-1 Connection to Terminal #1 Wall Box

TB1-7 Common Alarm Connection TB4-2 Site MonitoringConnection (-)

TB1-6 Common Alarm Connection TB4-1 Site MonitoringConnection (+)

TB1-5 Rem ote Shutdown P1 6 Remote Sensor Connection

TB1-4 Remote Shutdown

TB1-3 Customer Alarm Connection #2

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Figure 9.4 Control Board Inside the Wall Mounted Controller

Item Description

1 TB3-1

2 TB3-2

3 TB3-3

4 TB 3-4

5 DIP switches 1 to 8

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9.4 System Control and Performance

This section describes how the DataMate responds to operator input and room conditions.

9.4.1 Temperature Control

The following describes the methods of temperature control and determining cooling requirement for the various DataMate
cooling types.

9.4.2 Cooling/Heating Required

Temperature control by the microprocessor is based on a calculated percentage requirement for cooling/heating.

Cooling Operation for Compressorized(DX)andChilled WaterSystems

Cooling is activated when the temperature control calculates a cooling requirement of 100% and deactivated when the
cooling requirement drops below 50%. Hot gas bypass is activated when a call for cooling occurs unless there is also a call
for dehumidification.

Table 9.9 Hot Gas Bypass Response to Cooling and Dehumidification Modes

Mode Hot Gas Bypass

Cooling Only ON

Dehumidification O nly OFF

Cooling with Dehumidification OFF

9.4.3 Electric Reheat

Heating is activated when the temperature control calculates a heating requirement of 100% and deactivated when the
heating requirement drops below 50%.

9.4.4 Humidity Control

The following describes the methods of humidity control and determining humidification/dehumidification requirement for
the various DataMate cooling types.

Humidification Operation

The humidifier activates when the humidity control calculates a 100% humidification requirement, and it is deactivates when
the humidification requirement falls below 50%.

Dehumidification/Humidification Percent Required

The humidity control for the DataMate is based on a calculated percent requirement for dehumidification or humidification.
The percent requirement is calculated from the difference between the sensor reading and the humidity setpoint, divided
by the sensitivity. The control method is selectable between relative and absolute. Relative humidity control is the default.

Dehumidification Operation forCompressorized(DX) Systems

Dehumidification in the standard configuration operates the compressor without the hot gas bypass active. The fan operates
at low speed unless the cooling requirement reaches 100%. At 100% cooling requirement, the low speed fan is disabled
(unless manually overridden) until the cooling requirement decreases to 0%. Dehumidification is also disabled if the heating
requirement exceeds 125% and is re-enabled when the heating requirement reaches 50%.

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9.4.5 Load Control

The control system monitors the compressor and prevents it from turning on within a three-minute period of being off. If this
on-off-on cycle occurs too often (for example: 10 times in a one-hour period), a Short Cycle Alarm occurs.

9.4.6 Monitoring

Liebert IS-UNITY-DP - Field Installed Kit

The IS-UNITY-DP card provides full building management system (BMS) access via BACnet/Modbus IP and
BACnet/Modbus 485. Card provides access and supports SNMP v1/v2c/v3 and Liebert® Nform™. The wall mount kit for field
installation includes the IS-UNITY-DP card, power/communication interface card, painted enclosure, 120-V wall outlet
transformer with 6-ft. (2-m) low voltage power wire, and full instructions. Field supplied wiring for communication to the
Liebert DataMate and to other systems is required to access features.

9.5 Alarm Notification, Acknowledgment, and Descriptions

The microprocessor control system audibly and visually signals all enabled alarms including custom alarms. See

Configuring Custom Alarms on page74, for settings and customization options.

When a new alarm occurs, it is displayed on the screen and the audible alarm is activated. (If communicating with a
Liebert® monitoring product, the alarm is also transmitted.) The message PRESS ALARM SILENCE prompts you to silence
the alarm. After the alarm is silenced, the display return to the Normal Status display. Alarms can also be silenced through
communication with a Liebert® monitoring product unit. See Viewing Active Alarms on page68.

Many alarms reset automatically when the alarm condition is no longer represented and after it has been acknowledged by
being silenced. The exceptions are:

• Software Alarms—Loss of Power alarms reset automatically 30 seconds after being silenced or acknowledged.
Short Cycle alarms reset automatically 90 minutes after being silenced or acknowledged.

• Alarms that monitor overload or high pressure switches may require a manual reset depending upon the
model.

The following sections describe and provide troubleshooting suggestions for each type of alarm. See Troubleshooting on
page101 for additional details. If you need further assistance, contact your Vertiv representative.

NOTE: Alarms are specific at the time the unit is ordered. Additional devices and wiring at the factory may be
required for some alarms.

9.5.1 Custom Alarms

Custom alarm(s) messages are programmed at the LCD display. The message displayed may be included in a list of
provided alarms or it may be customized text (for up to two alarms). See Configuring Custom Alarms on page74.

IMPORTANT! If using custom text messages, notify maintenance personnel of the alarm function and required action.

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9.5.2 High Head Pressure Alarm

Compressor head pressure is monitored with a pressure sensor switch. (One SPDT pressure switch is used per refrigeration
circuit). If head pressure exceeds 400 psig (2,760kPag), the switch turns off the compressor contactor and sends an input
signal to the control.

Acknowledge the condition by pressing the alarm silence button on the wall box, which will clear if the high head pressure is
alleviated. If the compressor is off for one hour, the control goes into a special cold start mode. In the cold start mode on a
call for cooling or dehumidification, the liquid line solenoid valve (LLSV) is energized. If the high pressure switch does NOT
trip within 10 seconds, the control returns to normal operation of monitoring the high head pressure switch for three
occurrences in a 12-hour period. It is a rolling timer and after the third high head alarm occurs and is acknowledged by the
user, it will lock off the compressor.

If while in the cold start mode, the high head pressure switch DOES trip within 10 seconds of the activation of the LLSV, the
control does not annunciate the alarm. The control will turn off the LLSV and delay 10 seconds. The control will permit this
occurrence two more times or a total of three times. If on the fourth try, the high head pressure switch trips within 10
seconds, the control will annunciate the alarm, turn off the LLSV, wait for the user to acknowledge the alarm and hold the
compressor off for three minutes, the length of the normal short cycle control. The control will permit this occurrence three
times. On the third occurrence, the control will lock the compressor off until the control power is reset. After the head
pressure problem is fixed, reset the control by disconnecting power to the evaporator unit.

To address a high head-pressure alarm:

• On air cooled systems—check for power shut off to the condensing unit, condensing unit fan not working,
defective head pressure control valves, dirty condenser coils or crimped lines. Also, make sure that side switch
on the compressor contactors close to energize the condensing unit control circuit.

• On water/glycol cooled systems—Check water regulating valves. Verify water/glycol flow (pumps are
operating and service valves are open). Is water tower or drycooler operating? Is the coolant temperature
entering the condensing unit at or below design conditions? Is AUX relay (terminals 70 & 71) operating during
cooling to turn on the drycooler?

9.5.3 Humidity Level Alarms

The humidity alarm may be activated under the following conditions:

• High: The room return air humidity exceeds the pre-set high humidity alarm setpoint. Is the unit set up for
dehumidification? Check DIP switch.

• Low: The room return-air humidity is below the low-humidity alarm setpoint. Is the unit set up for
humidification? Check DIP switch.

• High and Low Humidity (simultaneously): The simultaneous display of two alarms results in loss of the humidity
input signal, and dashes (- - -) are displayed for the humidity reading on the display. If this condition occurs, the
control system deactivates both humidification and dehumidification. Check for a disconnected cable or failed
sensor.

NOTE: Check for proper setpoints. Does the room have a vapor barrier to seal it from outdoor humidity? Are doors or
windows open to outside air?

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9.5.4 Temperature Level Alarms

The temperature level alarm may be activated under the following conditions:

• High: Room return air temperature increases to the high temperature alarm setpoint. Check for proper setpoint
value. Is the room load more than the unit can handle (unit capacity is too small)? Make sure cooling
components are operating (compressor or valves).

• Low: The room return air temperature decreases to the low temperature alarm setpoint. Check for proper
setpoint value. Make sure all heating components are operating (contactors, reheats, etc.). Are reheats drawing
the proper current (refer to amp rating on nameplate)?

• High and Low Simultaneously: The simultaneous display of the two alarms results in loss of the temperature
input signal (or the humidity is out of sensor range-15 to 85% RH), and dashes (---) are displayed for the
temperature reading on the display. If this condition occurs, the control system initiates 100% cooling. Check for
a disconnected cable or a failed sensor.

NOTE: Check for proper setpoints. Does the room have a vapor barrier to seal it from outdoor humidity? Are doors or
windows open to outside air?

9.5.5 Humidifier Problem Alarm

The Humidifier Problem alarm sounds and displays a message if any of the humidifier conditions described in Table 9.10

below, occur. The humidifier's control board fault indicator LED assists in determining the issue.

Table 9.10 Humidifier Faults and LED indicator

Fault Con dition LED Indicator

Overcurrent detection Lit constant

Fill system fa ult 1-second flash

Replace tank 1/2-second flash

9.5.6 Loss of Power Alarm

The Loss of Power alarm activates (after power is restored to the unit) if the unit has lost power or the disconnect switch was
incorrectly turned off before the unit’s On switch was pressed. A Liebert® remote monitoring unit (optional) will immediately
indicate loss of power.

9.5.7 Short Cycle Alarm

A Short Cycle alarm occurs if the compressor system exceeds 10 cooling start attempts in a one-hour period. This may
happen if the refrigerant level is low or if the cooling load is small compared to the unit’s capacity. Check for leaks, crimped
lines and defective components. If the cooling load is low, increase sensitivity to reduce cycle.

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10 MAINTENANCE

Use copies of the Preventive Maintenance Checklist on page97 to record preventive maintenance inspections.

WARNING! Arc flash and electric shock hazard. Open all local and remote electric power supply disconnect
switches, verify with a voltmeter that power is Off and wear appropriate, OSHA approved personal protective
equipment (PPE) per NFPA 70E before working within the 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 Liebert® controller does
not isolate power from the unit, even in the Unit Off mode. Some internal components require and receive
power even during the Unit Off mode of the controller. 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 electric shock. Can cause equipment damage, injury, or death. Open all local and remote
electric power supply disconnect switches and verify with a voltmeter that power is off before working within
any electric connection enclosures. Service and maintenance work must be performed only by properly
trained and qualified personnel and in accordance with applicable regulations and manufacturers’
specifications. Opening or removing the covers to any equipment may expose personnel to lethal voltages
within the unit even when it is apparently not operating and the input wiring is disconnected from the
electrical source.

WARNING! Risk of improper wiring, piping, moving, lifting and handling. Can cause equipment damage,
serious injury or death. Installation and service of this equipment should be done only by qualified personnel,
wearing appropriate, OSHA approved PPE, who have been specially trained in the installation of air
conditioning equipment.

The Liebert® DataMate units are single components in the facility heat removal system. The system includes air distribution
(duct systems), heat rejection (condensing units or chilled water), and indoor cooling and humidity loads (equipment load,
location, outside air infiltration). Proper application and maintenance of the entire system is critical to the life and reliability
of the thermal management units.

• Good maintenance practices are essential to minimizing operation costs and maximizing product life.

• Read and follow monthly and semi-annual maintenance schedules included in this manual. These MINIMUM
maintenance intervals may need to be more frequent based on site-specific conditions.

• We recommend the use of trained and authorized service personnel, extended service contracts and factory­specified replacement parts. Contact your Vertiv sales representative.

10 M ainten ance

85

10.1 System Testing

WARNING! Arc flash and electric shock hazard. Open all local and remote electric power supply disconnect
switches, verify with a voltmeter that power is Off and wear appropriate, OSHA approved personal protective
equipment (PPE) per NFPA 70E before working within the 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 Liebert® controller does
not isolate power from the unit, even in the Unit Off mode. Some internal components require and receive
power even during the Unit Off mode of the controller. 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 contact with high-speed moving parts. Can cause injury or death. Open all local and remote
electric power-supply disconnect switches, verify with a voltmeter that power is off, and verify that all the fan
blades have stopped moving before working in the unit.

10.1.1 Environmental Control Function Tests

The performance of all control circuits can be tested by changing the setpoints, which actuates each of the main functions.

10.1.2 Cooling Test

To test the cooling function, set the setpoint to a temperature of 10°F (5°C) below room temperature. A call for cooling
should register and prompt the equipment to begin cooling cycle. (Disregard any temperature alarms.) Upon completion of
testing, return the setpoint to the desired temperature.

10.1.3 Heating Test

Test reheat by setting the setpoint to 10°F (5°C) above room temperature. A call for heating should register and prompt the
equipment to begin heating cycle. (Disregard any temperature alarms.) Upon completion of testing, return the setpoint to
the desired temperature.

10.1.4 Humidification Test

To check humidification, set the humidity setpoint at 10% RH above the room humidity reading. After a short delay, the
canister will fill with water and steam will be produced. Upon completion of testing, return the humidity setpoint to the
desired humidity.

10.1.5 Dehumidification Test

Test dehumidification by setting the humidity setpoint at 10% RH below room relative humidity. The compressor should
turn on. Upon completion of testing, return the humidity setpoint to the desired humidity.

10.1.6 Remote Shutdown Test

A connection point is provided for remote shutdown devices supplied by the customer. This terminal strip is on the printed
circuit board. (Terminals are fitted with a jumper when no remote shutdown device is installed.)

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10.2 Filter Maintenance

Experience shows that filters are usually the most neglected item in an environmental control system. In order to maintain
efficient operation, they should be checked monthly and washed as required.

NOTE: Always turn power Off before removing filters.

The washable filter is located behind the front access panel on the lower-front on the evaporator.

10.3 Electric Panel Maintenance

Inspect the electric panel on a semi-annual basis for any loose electrical connections.

10.4 Direct Drive Blower Package Maintenance

Inspect the blower package monthly including: motor mounts, fan bearings and impellers.

10.4.1 Fan Impeller and Motor Bearing Maintenance

Inspect fan impellers thoroughly and remove any debris. Check to see if the impellers are tightly mounted on the fan shaft
and that they do not rub against the fan housing during rotation. Although the unit's motor bearings are permanently sealed
and self-lubricating, inspect them monthly for signs of wear.

10.4.2 Air Distribution Inspection

Because all unit models are designed for constant volume air delivery, any unusual restrictions within the air circuit must be
avoided.

10.5 Electric Reheat Maintenance

Reheat element sheets and fins are manufactured with stainless steel. Regular inspections are necessary to assure proper
cleanliness of the reheating element. If inspection reveals corrosion particles on the reheating element or adjoining surfaces
(including ducts and plenums), perform appropriate cleaning. Periodic replacement of the reheating element may be
necessary to meet specific application requirements.

10.6 Refrigeration System Maintenance

Inspect the components of the refrigeration system monthly for proper function and signs of wear. Because evidence of
malfunction is typically present before component failure, periodic inspections are a major factor in the prevention of most
system failures. Refrigerant lines must be properly supported and not allowed to vibrate against ceilings, floors, or unit
frame. Inspect all refrigerant lines every six months for signs of wear and proper support. Inspect the capillary and equalizer
lines from the expansion valve.

10.6.1 Refrigeration Suction Pressure

Suction pressure will vary with load conditions. Suction pressure normally ranges from 58 psi to 75 psi (405 kPa to 517 kPa).

10.6.2 Refrigeration Discharge Pressure

The discharge pressure will vary greatly with load and ambient conditions, see Table 10.1 on the next page. The high
pressure switch shuts down the compressor at its cutout setting.

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Table 10.1 Typical Discharge Pressures

System Design Discharge Pressure, psig (kPa)

Air Cooled 200-300 (1,380-2,070)

Water Cooled 65 to 85°F water (18 to 29.4°C) 200-250 (1, 380-1,725)

Glycol Cooled 250-350 (1,7 25-2,415)

High Pressure Cutout 400 (2,760)

10.6.3 Thermostatic Expansion Valve (TXV) Maintenance

The TXV performs one function: It keeps the evaporator supplied with enough refrigerant to satisfy load conditions. It does
not affect compressor operation.

Proper valve operation can be determined by measuring superheat. The correct superheat setting is between 10 and 15°F
(5.6 and 8.3°C). If too little refrigerant is being fed to the evaporator, the superheat will be high. If too much refrigerant is
being supplied, the superheat will be low.

10.6.4 Air Cooled Condensing Unit Maintenance

Restricted airflow will reduce operating efficiency and could result in high compressor head pressure and loss of cooling.

• Clear coil surface of all debris that will inhibit airflow.

• Check for bent or damaged coil fins and correct.

• Do not permit snow to accumulate around or under outdoor unit.

• Periodically consider commercial cleaning of coil surface

• Inspect fans, motors and controls for proper operation.

• Check all piping and capillaries for vibration and proper support.

• Inspect all refrigerant lines for signs of oil leaks.

• Check contactors for pitting. Replace if pitted.

10.6.5 Hot Gas Bypass Operation and Maintenance

When applying hot gas bypass with split system condensing units, bypassing discharge gas to the compressor suction line
offers more flexibility than conventional hot gas bypass to the evaporator unit.

The hot gas bypass valve is installed between the compressor discharge piping and suction piping, bypassing the
condenser and evaporator coils. The discharge gas mixes with the suction gas, raising the suction temperature and pressure
and decreasing the mass flow through the evaporator. The higher suction temperatures could cause compressor
overheating, therefore a separate, liquid quenching valve is provided to mix refrigerant from the system liquid line with the
discharge gas before mixing with the suction gas entering the compressor.

During normal operation, when the evaporator is under full load, the hot gas bypass equalizer pressure will remain high
enough to keep the valve port closed. If the evaporator load decreases, the evaporator temperature and pressure will drop.
When the suction pressure reduces below the hot gas-bypass valve setting the hot gas bypass valve opens diverting some
of the refrigerant flow back to the compressor suction. The liquid quenching valve bulb senses this increased superheat and
opens, allowing liquid refrigerant to mix with the discharge gas, de-superheating it.

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Proper mixing of the three refrigerant paths ensures stable operation and system performance. The liquid quenching valve
bulb must be located downstream of all these connections to control superheat at the compressor inlet. Superheat settings
for the liquid quenching valve are chosen to maintain consistency with the system expansion valve. During hot gas bypass
operation, higher superheats, 50to60°F (28 to 33°C), may be observed at the compressor. The liquid quenching valve is
internally equalized and superheat is not adjustable.

Figure 10.1 Hot Gas Bypass Components and Flow

Item Description

1 Discharge bypass valve

2 External equalizer

3 Evaporator

4 Distributor

5 TEV

6 Catch-all

7 Solenoid valve

8 Receiver

9 Condenser coil

10 Compressor

11 De-superheating TEV

12 Hot gas solenoid valve

13 External equalizers

To adjust hot gas bypass:

1. Install the suction and discharge pressure gauge.

2. Adjust temperature setpoint to call for cooling so that the refrigeration compressor will run continuously.

3. Remove the TOP adjusting nut from the valve.

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4. Insert an Allen wrench in the brass hole at top of valve in adjusting port, and turn CLOCKWISE if a higher
evaporator temperature is required. Adjust no more than 1/4 turn at a time. Let the system stabilize for 15
minutes before determining if additional adjustment are necessary.

5. After obtaining the suction pressure required, reinstall cap tightly making sure there are no leaks.

6. Let the evaporator operate for approximately 10 to 15 minutes to make sure the suction pressure is within the
range desired.

7. There may be a fluctuation of approximately 3 to 6 psig (21 to 41 kPa) on the evaporator due to the differential
on the hot gas bypass.

8. Return temperature setpoint to the desired setting.

10.6.6 Water/Glycol Condenser Maintenance

The DMC module has a compact, brazed plate condenser, and the MCD water/glycol cooled condensing unit has a coaxial
condenser. Clean the screen on the field installed Y-strainer (if installed. Highly recommended for DMC modules with
brazed plate condensers). If the water supply is clean, coaxial condensers do not normally require maintenance or
replacement. If your system begins to operate at high head pressure with reduced capacity and all other causes have been
eliminated, the condenser may be obstructed or fouled and should be cleaned or replaced.

10.6.7 Regulating Valve Maintenance (Water/Glycol Cooled Condensers Only)

The water regulating valve automatically regulates the amount of fluid necessary to remove the heat from the refrigeration
system, permitting more fluid to flow when load conditions are high and less fluid to flow when load conditions are low. The
valve consists of a brass body, balance spring, valve seat, valve disc holders, capillary tube to discharge pressure and
adjusting screw.

The water regulating valve begins opening at 180 psig (1,240 kPag) and is fully opened at 240 psig (1,655 kPag). The valve
is factory set and should not need adjustment. There is significant difference in the way standard pressure and high pressure
valves are adjusted. Consult Vertiv technical support.

10.6.8 Glycol Solution Maintenance

It is difficult to establish a specific schedule of inhibitor maintenance because the rate of inhibitor depletion depends upon
local water conditions. Analysis of water samples at the time of installation and through a maintenance program should help
to establish a pattern of depletion. A visual inspection of the solution and filter residue is often helpful in judging whether
active corrosion is occurring.

The complexity of water/glycol solution condition problems and the variations of required treatment programs make it
extremely important to obtain the advice of a competent and experienced water treatment specialist and follow a regularly
scheduled coolant fluid system maintenance program. It is important to note that improper use of water treatment
chemicals can cause problems more serious than using none. Proper inhibitor maintenance must be performed in order to
prevent corrosion of the glycol system. Consult the glycol manufacturer for testing and maintenance of inhibitors. Do not mix
products from different manufacturers.

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10.7 Compressor Maintenance

WARNING! Risk of over-pressurization of the refrigeration system. Can cause piping rupture, explosive
discharge of high pressure refrigerant, loss of refrigerant, environmental pollution, equipment damage,
injury, or death. This unit contains fluids and gases under high pressure. Use extreme caution when
charging the refrigerant system. Do not pressurize the system higher than the design pressure marked on
the unit's nameplate. Relieve pressure before cutting into or making connections/disconnections to the
piping system. Local building or plumbing codes may require installing a pressure relief device in the
system.

Consult local building and plumbing codes for installation requirements of additional pressure relief devices
when isolation valves are field installed. Do not isolate any refrigerant circuits from over-pressurization
protection. The PFH and MCD condensing units include a factory installed pressure relief valve mounted on
top of the receiver. The valve is rated for a maximum working pressure of 475 psig.

CAUTION: Risk of contacting caustic substances. Can cause injury. Avoid touching or contacting the gas and
oils with exposed skin. Severe burns will result. Wear appropriate, OSHA approved PPE when handling
contaminated parts.

Infrequently, a fault in the motor insulation may result in a motor burnout (if system is properly installed, motor burnout
rarely occurs). Primarily, this type of failure is due to mechanical or lubrication problems, where the burnout is a secondary
consequence.

Early detection can prevent a large percentage of the problems that can cause compressor failures. Periodic maintenance
inspections that identify abnormal operation can be a major factor in reducing maintenance costs. It is easier and more cost
effective to implement the necessary preventative steps that ensure proper system operation, rather than ignore a problem
until it results in compressor failure and costly replacement. When troubleshooting a compressor problem, check all
electrical components for proper operation:

• Check all fuses and circuit breakers.

• Check pressure switch operation.

• If a compressor failure has occurred, determine whether its cause is an electrical or mechanical problem.

10.7.1 Mechanical Failure of the Compressor

If you determine that a mechanical failure has occurred, the compressor must be replaced. If a burnout occurs, correct the
problem and clean the system. It is important to note that successive burnouts of the same system are usually caused by
improper cleaning. If a severe burnout has occurred, the oil will be black and acidic.

10.7.2 Electrical Failure of the Compressor

In the event of an electrical failure and subsequent burnout of the refrigeration compressor motor, proper procedures must
be followed to thoroughly remove any acids that would cause a future failure. There are two kits that can be used with a
complete compressor burnout - Sporlan System Cleaner and Alco Dri-Kleener. Follow the manufacturer's procedure.

NOTE: Damage to a replacement compressor due to improper system cleaning constitutes abuse under the terms of
the warranty, thereby voiding the warranty.

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10.7.3 Replacement Compressors

Replacement compressors are available from your Vertiv supplier and are shipped to the job site in a reusable crate (as
required by the service contractor). If the compressor is under warranty, you must return it to Vertiv, to receive proper
warranty credit. Return it in the same container in which the replacement compressor was shipped. Record the possible
cause(s) or condition(s) of the damage on the provided return tag.

10.7.4 Replacing a Failed Compressor

1. Disconnect power.

2. Attach suction and discharge gauges to access fittings.

3. Recover refrigerant using standard recovery procedures and equipment. Use a filter drier when charging the
system with recovered refrigerant.

NOTE: Release of refrigerant to the atmosphere is harmful to the environment and unlawful. Refrigerant must be
recycled or discarded in accordance with federal, state, and local regulations.

4. Remove failed compressor.

5. Install replacement compressor and make all connections.

• Use a flow of dry nitrogen through the piping during brazing to prevent formation of copper oxide scale
inside the piping. Copper oxide forms when copper is heated in the presence of air. POE oil will dissolve
these oxides from inside the copper pipes and deposit them throughout the system, clogging filter driers
and affecting other system components.

• A pure dry nitrogen flow of 1-3 ft3/min (0.5-1.5 l/s) inside the pipe during brazing is sufficient to displace
the air. Control the flow using a suitable metering device. Pressurize and leak test the system at
approximately 150 psig (1,034 kPa) pressure.

6. Follow manufacturer's instructions for clean-out kits.

7. Evacuate the system twice to 500 microns. Break the vacuum each time with clean, dry nitrogen.

8. Evacuate the system a third time to 500 microns.

9. Charge the system with refrigerant (R-407C) based on requirements of the evaporator, condensing unit, and
lines. Refer to the unit nameplate.

10. Apply power and operate the system. Check for proper operation. Refer to Table 10.1 on page88.

10.8 Steam Generating Humidifier Maintenance

The humidifier drains and refills to maintain a current setpoint and alert the operator when the humidifier canister needs to
be replaced.

WARNING! Arc flash and electric shock hazard. Open all local and remote electric power supply disconnect
switches, verify with a voltmeter that power is Off and wear appropriate, OSHA approved personal protective
equipment (PPE) per NFPA 70E before working within the 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 Liebert® controller does
not isolate power from the unit, even in the Unit Off mode. Some internal components require and receive
power even during the Unit Off mode of the controller. 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.

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WARNING! Risk of improper wiring, piping, moving, lifting and handling. Can cause equipment damage,
serious injury or death. Installation and service of this equipment should be done only by qualified personnel,
wearing appropriate, OSHA approved PPE, who have been specially trained in the installation of air
conditioning equipment.

WARNING! Risk of smoke and fire. Can cause activation of fire suppression systems, building evacuation,
dispatching of fire/rescue equipment and personnel and catastrophic canister failure resulting in water
leaks, equipment damage, injury or death. Using a humidifier canister that has reached the end of it’s service
life can be extremely hazardous. If the canister cannot be replaced immediately at the end of life condition,
turn Off the power and water supply to the humidifier and remove the canister until a replacement canister
can be installed. Do not ignore humidifier problem alarms. Resetting humidifier without addressing cause
may result in fire or damage due to leaking water.

CAUTION: Risk of contact with hot surfaces. Can cause burn injury. The humidifier canister and steam
discharge lines are extremely hot during operation. Allow sufficient time for them to cool to a touch-safe
temperature before handling. Use extreme caution and wear appropriate, OSHA approved PPE when
performing maintenance on the humidifier.

After an extended period of operation, in accordance with life expectancy information, the cylinder is completely used as
indicated by the amber high water sensor light illuminated on the cabinet. When this condition is reached, a new
replacement cylinder must be installed.

NOTE: The amber high water sensor light may come on during initial start-up, but this instance does not indicate that
the cylinder should be replaced.

The steam cylinder is disposable and must be replaced at the end of the cylinder's life. Cylinder life will vary according to
water supply conditions and humidifier use.

10.8.1 Operating the Humidifier

1. During start-up, when the humidity control calls for humidification, the fill valve opens and allows water to enter
the canister. When the water level reaches the electrodes, current flows and the water begins to warm. The
canister fills until the amperage reaches the setpoint and the fill valve closes. As the water warms, its
conductivity increases and the current flow, in turn, rises. If the current reaches 115% of the normal operating
current, the drain valve opens and drains some of the water out of the canister. This reduces electrode contact
with the water and lowers the current flow to the amperage setpoint. Boiling soon commences, and the canister
operates normally.

2. If the conductivity of the water is low, the canister fills and the water level reaches the canister full electrode
before the current setpoint is reached. The humidifier stops filling to prevent overflow. Boiling should
commence in time. As water is boiled off, the mineral concentration in the canister increases and current flow
also increases. The canister eventually reaches full output and goes to normal operation. No drain is permitted
until then.

3. When full output is reached the circuit board starts a time cycle which is factory set at 60 seconds. During this
repeating time cycle, the fill valve will open periodically to replenish the water being boiled off and maintain a
steady state output at the setpoint. The amperage variance depends on the conductivity of the water.

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4. After many cycles, the mineral concentration in the canister becomes too high. When this occurs, the water
boils too quickly. As the water quickly boils off and less of the electrode is exposed, the current flow decreases.
When the current crosses the low threshold point before the end of the time cycle, the drain valve opens,
draining the mineral laden water out and replacing it with fresh water. This lowers the mineral concentration
and returns the canister to steady state operation and prolongs canister life. The frequency of drains depends
on water conductivity.

5. Over a period of time, the electrode surface becomes coated with a layer of insulating material, which causes a
drop in current flow. As this happens, the water level in the canister will slowly rise exposing new electrode
surface to the water to maintain normal output. Eventually, the steady state water level will reach the canister
full electrode and indicate so by activating the canister full alarm and opening the humidifier contactor. At this
point, all of the electrode surface has been used up and the canister must be replaced.

6. After the entire electrode surface has been coated, the output will slowly begin to fall off. This usually occurs in
the last several hours of electrode life and should allow enough time to schedule maintenance. During these last
hours, the mineral concentration can increase. If the mineral concentration is too high, arcing can occur. If the
electrodes start to arc, turn off the humidifier immediately and replace the canister with the identical part.

10.8.2 Replacing the Canister

The humidifier RUN/DRAIN switch is located in the humidifier assembly. This switch should be in the RUN position when the
humidifier is in normal operation. It should be in the DRAIN position when a manual drain for service is required. The
electronic control board for the humidifier is located in the same area as the humidifier assembly. When the unit is
energized, power is available to the humidifier circuits.

1. Turn off the humidifier by lowering the humidity setpoint below the ambient humidity level.

Record the original setpoint.

2. Place the RUN/DRAIN switch in the DRAIN position to drain the water from the canister.

3. Return the RUN/DRAIN switch to the RUN position after the canister has drained.

4. Turn Off the power at the main unit.

5. Remove the cover from the humidifier cabinet

6. Locate the power wires to the steam canister. They are connected to the canister with 1/4-in. quick connects.
Make note of the wiring configuration before removing any wires. Refer to the schematic on the unit. Slide the
rubber boot back to expose the connections. Remove the two power wires and the canister wire. Do not loosen
the screws that secure the electrodes.

7. Loosen the steam outlet hose clamps and slide the steam hose away from the canister fitting.

8. Release the canister clamp along the base of the canister.

The canister is now ready to be removed.

9. Remove the canister.

10. Reverse these steps to replace the canister, taking special note of the following:

• When replacing wiring, connect the red wire from terminal #1 on the interface to the red tip terminal on
the canister. Reconnect the power wires as they were formerly connected (#2 on the left and #1 on the
right).

• Always check the fill and drain solenoids for proper operation after replacing the canister.

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