York YHAU-CE Owner's manual

DOUBLE-EFFECT EXHAUST GAS
ABSORPTION CHILLER-HEATER
INSTALLATION, OPERATION, MAINTENANCE NEW RELEASE Form 155.35-ICOM2.EN.CE/GB (1018)
Issue Date:
October 30, 2018
MODEL YHAU-CE
150-1440 TONS
527-5064 KW
50 HZ
LDxxxxx
C

JOHNSON CONTROLS
2
FORM 155.35-ICOM2.EN.CE/GB (1018)
DATE: 10/30/2018
This equipment is a relatively complicated apparatus.
During rigging, installation, operation, maintenance,
or service, individuals may be exposed to certain com-
ponents or conditions including, but not limited to:
heavy objects, refrigerants, materials under pressure,
rotating components, and both high and low voltage.
Each of these items has the potential, if misused or
handled improperly, to cause bodily injury or death. It
is the obligation and responsibility of rigging, instal-
lation, and operating/service personnel to identify and
recognize these inherent hazards, protect themselves,
and proceed safely in completing their tasks. Failure
to comply with any of these requirements could result
in serious damage to the equipment and the property in
IMPORTANT!
READ BEFORE PROCEEDING!
GENERAL SAFETY GUIDELINES
which it is situated, as well as severe personal injury or
death to themselves and people at the site.
This document is intended for use by owner-authorized
rigging, installation, and operating/service personnel. It
is expected that these individuals possess independent
training that will enable them to perform their assigned
tasks properly and safely. It is essential that, prior to
performing any task on this equipment, this individual
shall have read and understood the on-product labels,
this document and any referenced materials. This in-
dividual shall also be familiar with and comply with
all applicable industry and governmental standards and
regulations pertaining to the task in question.
SAFETY SYMBOLS
The following symbols are used in this document to alert the reader to specific situations:
Indicates a possible hazardous situation
which will result in death or serious injury
if proper care is not taken.
Indicates a potentially hazardous situa-
tion which will result in possible injuries
or damage to equipment if proper care is
not taken.
Identies a hazard which could lead to
damage to the machine, damage to other
equipment or environmental pollution if
proper care is not taken or instructions
and are not followed.
Highlights additional information useful
to the technician in completing the work
being performed properly.
External wiring, unless specied as an optional connection in the manufacturer’s product line, is not
to be connected inside the control cabinet. Devices such as relays, switches, transducers and controls
and any external wiring must not be installed inside the micro panel. All wiring must be in accordance
with Johnson Controls’ published specications and must be performed only by a qualied electri-
cian. Johnson Controls will NOT be responsible for damage or problems resulting from improper
connections to the controls or application of improper control signals. Failure to follow this warn-
ing will void the manufacturer’s warranty and cause serious damage to property or personal injury.

JOHNSON CONTROLS 3
FORM 155.35-ICOM2.EN.CE/GB (1018)
DATE: 10/30/2018
MANUAL DESCRIPTION FORM NUMBER
Absorption Chiller-heater Long Term Storage 50.20-NM11
Long-Term Storage Checklist - Absorption Chiller-heater 50.20-CL10
Long-Term Storage Requirements - General 50.20-NM10
Chiller-Heater Start-up and Commissioning Checklist 155.35-CL1
CHANGEABILITY OF THIS DOCUMENT
In complying with Johnson Controls’ policy for con-
tinuous product improvement, the information con-
tained in this document is subject to change without
notice. Johnson Controls makes no commitment to
update or provide current information automatically
to the manual or product owner. Updated manuals, if
applicable, can be obtained by contacting the nearest
Johnson Controls Service office or accessing the John-
son Controls QuickLIT website at http://cgproducts.
johnsoncontrols.com.
It is the responsibility of rigging, lifting, and operating/
service personnel to verify the applicability of these
documents to the equipment. If there is any question
regarding the applicability of these documents, rig-
ging, lifting, and operating/service personnel should
verify whether the equipment has been modified and
if current literature is available from the owner of the
equipment prior to performing any work on the chiller-
heater.
CHANGE BARS
Revisions made to this document are indicated with a
line along the left or right hand column in the area the
revision was made. These revisions are to technical in-
formation. Any other changes in spelling, grammar or
formatting are not included.
ASSOCIATED LITERATURE

JOHNSON CONTROLS
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FORM 155.35-ICOM2.EN.CE/GB (1018)
DATE: 10/30/2018
NOMENCLATURE
Approvals
• GB/T 18431-2014
For Europe:
• CE
• EN ISO 12100:2010
• EN 60204-1: 2006+A1: 2009
• EMC Directive 201 4/30 EC
• EN 55011: 2009+A1: 2010 (Group 1, Class A)
• EN 61000-6-2: 2005
Images contained in this document may represent the standard product with available options.
YHAU C E 500 EX S
NOMINAL
CAPACITY (RT)
Unit Type
York Absorption
LD26804
LOW TEMP. CHW
L :
1.0 °C CHW
LL: -5.0 °C CHW
MODEL SERIES NAME
EX= 150 - 700 RT NOMINAL CAPACITY
EXW- 800 - 1000 RT NOMINAL CAPACITY
EXW3- 1120-1440 RT NOMINAL CAPACITY
EFFICIENCY
None: Highest efficiency
H = High efficiency
S = Standard efficiency
FUEL
E: Exhaust
Gas
DESIGN
SYMBOL
LL
LD26804

JOHNSON CONTROLS 5
FORM 155.35-ICOM2.EN.CE/GB (1018)
DATE: 10/30/2018
TABLE OF CONTENTS
SECTION 1 – GENERAL CHILLER-HEATER AND SAFETY INFORMATION...................................................... 11
Introduction..................................................................................................................................................... 11
About this Manual........................................................................................................................................... 11
Warranty ......................................................................................................................................................... 11
Quality Assurance .........................................................................................................................................12
High Temperature and Pressure Cleaning ....................................................................................................12
Safety Labels..................................................................................................................................................13
SECTION 2 – PRODUCT DESCRIPTION ..............................................................................................................15
Chiller-Heater Components............................................................................................................................15
Control Panel..................................................................................................................................................15
How It Works (Exhaust Gas Units).................................................................................................................16
Evaporator......................................................................................................................................................17
Absorber.........................................................................................................................................................17
Two-step Evaporator – Absorber....................................................................................................................18
Plate Type Heat Exchangers..........................................................................................................................18
Parallel Flow...................................................................................................................................................19
High Temperature Generator (HTG)...............................................................................................................19
Low Temperature Generator...........................................................................................................................20
Condenser......................................................................................................................................................20
Crystallization .................................................................................................................................................21
Why Does Crystallization Occur?..........................................................................................................21
SECTION 3 – HANDLING, STORAGE, INSTALLATION AND REASSEMBLY.....................................................23
Inspection .......................................................................................................................................................24
Inspection Window .........................................................................................................................................24
Installation Guidelines ....................................................................................................................................24
Hoisting the Machine......................................................................................................................................25
Moving the Machine on Rollers ......................................................................................................................26
Structural Support and Installation .................................................................................................................29
Indoor and Outdoor Installation ......................................................................................................................29
Electrical.........................................................................................................................................................29
Precautions for Use .......................................................................................................................................29
Leak Testing ...................................................................................................................................................30
Electrical Shock Cautions...............................................................................................................................30
Use of Gas .....................................................................................................................................................31
Exhaust Gas Damper .....................................................................................................................................31
Exhaust Gas Temperature Sensor .................................................................................................................31
Vibration and Isolation Details........................................................................................................................32
Hot Insulation and cold Insulation Procedure.................................................................................................35

JOHNSON CONTROLS
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FORM 155.35-ICOM2.EN.CE/GB (1018)
DATE: 10/30/2018
TABLE OF CONTENTS (CONT'D)
SECTION 4 - TECHNICAL DATA ...........................................................................................................................39
Weights and Dimensions................................................................................................................................40
Upper Communication Specification ..............................................................................................................46
Upper Communication System Conguration .......................................................................................46
Scope of Delivery ..................................................................................................................................47
Connection Port for Ethernet Communication.......................................................................................47
Communication Specication ................................................................................................................47
Communication Data.............................................................................................................................48
User-Created ........................................................................................................................................49
2-Wire Cable Diagrams Without Adaptor ..............................................................................................50
4 Wire Type Cable Diagrams Without Adaptor......................................................................................51
SECTION 5 - COMMISSIONING ............................................................................................................................55
General Guidelines for Use ............................................................................................................................55
Before Operation ...................................................................................................................................55
Precautions For The Use Of Water ................................................................................................................56
Chilled / Hot Water Outlet Temperature Controller .........................................................................................56
Liquid Level Gauges.......................................................................................................................................56
Start the Chiller-Heater...................................................................................................................................57
Stop the Chiller-Heater...................................................................................................................................57
Interlock Procedure .......................................................................................................................................57
SECTION 6 – OPERATION ....................................................................................................................................63
YHAU-CE Control Center ..............................................................................................................................63
Common Items ...............................................................................................................................................63
Change Numeric Values.................................................................................................................................64
Date and Time ................................................................................................................................................64
Operating Status ............................................................................................................................................67
Failure ............................................................................................................................................................74
Alarm ..............................................................................................................................................................79
Control Parameter ..........................................................................................................................................82
Operation Switch ............................................................................................................................................83
Select Language ............................................................................................................................................83
SECTION 7 – MAINTENANCE...............................................................................................................................85
Exhaust Duct Inspection.................................................................................................................................85
Valve Inspection .............................................................................................................................................85
Solenoid Valves..............................................................................................................................................85
Pump Shut Off Valves .................................................................................................................................... 85
Air Purge Valves and Drain Valves.................................................................................................................85
Purge Valves ..................................................................................................................................................86
Start the Chiller-Heater After It Has Been Stopped for A Long Period ...........................................................86
Checks After Operation Starts...............................................................................................................86

JOHNSON CONTROLS 7
FORM 155.35-ICOM2.EN.CE/GB (1018)
DATE: 10/30/2018
Performance Check Method of Vacuum Pump ..............................................................................................87
Purge Procedure ............................................................................................................................................89
Manual Method to Purge Non-condensable Gas Directly from Absorber..............................................89
Manual Method to Purge Non-condensable Gas from Purging Tank ....................................................89
Automatic Method to Purge Non-condensable Gas from Purging Tank................................................90
Refrigerant Refining Method ..........................................................................................................................93
Manual Refrigerant Blowdown and Dilution Method ......................................................................................93
Decrystallization Method ................................................................................................................................94
Indications of Crystallization..................................................................................................................94
Decrystallization ....................................................................................................................................94
Precautions for Decrystallization ....................................................................................................................95
Maintenance Items .........................................................................................................................................95
Refrigerant Pump Manual Stop .............................................................................................................98
Purge Manual Start and Stop ................................................................................................................98
Operation Mode Selection.....................................................................................................................98
Blower Fan Manual Stop .......................................................................................................................99
Exhaust Gas Contaminants............................................................................................................................99
Exhaust Gas Chimney Requirements ...................................................................................................99
Lifespan of Common Parts...........................................................................................................................100
Water Quality Control ...................................................................................................................................102
Chemical Water Treatment...........................................................................................................................103
Replacement of Water ................................................................................................................................. 103
Treatment For Long Stoppage Of The Absorption Chiller-Heater ................................................................103
Chemical Treatment ....................................................................................................................................103
Flow Speed in Tubes ...................................................................................................................................103
Storage Method of the Chiller-Heater...........................................................................................................106
Wet Storage Method ...........................................................................................................................106
Dry Storage Method ............................................................................................................................107
Precautions Against External Damage.........................................................................................................107
Storage Method of the Cooling Water During Heating Operation Period .....................................................108
Wet Storage ........................................................................................................................................108
Work Procedure ..................................................................................................................................109
Dry Storage ......................................................................................................................................... 110
Work Procedure .................................................................................................................................. 110
SECTION 8 – TROUBLESHOOTING................................................................................................................... 115
Troubleshooting Performance Issues........................................................................................................... 117
Vacuum Pump .............................................................................................................................................. 118
Abnormal Solution and Refrigerant Levels................................................................................................... 118
Actions to Take Against Power Failure .........................................................................................................124
SECTION 9 - DECOMMISSIONING, DISMANTLING, AND DISPOSAL .............................................................125
TABLE OF CONTENTS (CONT'D)

JOHNSON CONTROLS
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FORM 155.35-ICOM2.EN.CE/GB (1018)
DATE: 10/30/2018
LIST OF FIGURES
FIGURE 1 - YHAU-CE Components .......................................................................................................................15
FIGURE 2 - Exhaust Gas Absorption Chiller-Heater Diagram (Cooling Mode).......................................................16
FIGURE 3 - Hoisting Procedure ..............................................................................................................................25
FIGURE 4 - Moving the Machine on Rollers ...........................................................................................................26
FIGURE 5 - Moving the Machine on Tir-Rollers ......................................................................................................27
FIGURE 6 - Jack-Up Procedure..............................................................................................................................28
FIGURE 7 - Vibration and Isolation Details .............................................................................................................32
FIGURE 8 - Nozzle Locations (Example - One Exhaust Gas Outlet Flange)..........................................................33
FIGURE 9 - Nozzle Locations (Example - Two Exhaust Gas Outlet Flanges) ........................................................34
FIGURE 10 - Hot and Cold Insulation (Example - One Exhaust Gas Outlet Flange)..............................................36
FIGURE 11 - Hot and Cold Insulation (Example -Two Exhaust Gas Outlet Flange) ...............................................37
FIGURE 12 - Exterior of Control Panel....................................................................................................................38
FIGURE 13 - External Connection Terminal Details for CE.....................................................................................43
FIGURE 14 - External Connection Details For GB..................................................................................................44
FIGURE 15 - Upper Communication System Conguration For CE ....................................................................... 46
FIGURE 16 - 2-Wire 1:1 Connection with User-Created Cable...............................................................................50
FIGURE 17 - 2-Wire n:1 Connection with User-Created Cable...............................................................................51
FIGURE 18 - 4-Wire 1:1 Connection With User-Created Cable..............................................................................51
FIGURE 19 - 4-Wire N:1 Connection with User Created Cable. ............................................................................52
FIGURE 20 - Sample Sound Testing.......................................................................................................................53
FIGURE 21 - Cooling Start Diagram .......................................................................................................................58
FIGURE 22 - Cooling Start Diagram ......................................................................................................................59
FIGURE 23 - Cooling Stop Diagram........................................................................................................................60
FIGURE 24 - Sequential Operation Flowchart ........................................................................................................61
FIGURE 25 - Shutdown Exhaust Gas Chiller-Heater Flowchart .............................................................................61
FIGURE 26 - Main Screen.......................................................................................................................................67
FIGURE 27 - Data Screen.......................................................................................................................................69
FIGURE 28 - Alarm History Screen.........................................................................................................................71
FIGURE 29 - Trend Screen .....................................................................................................................................72
FIGURE 30 - Trend Screen - Part 2 ........................................................................................................................73
FIGURE 31 - Failure Screen ...................................................................................................................................74
FIGURE 32 - Alarm Screen .....................................................................................................................................79
FIGURE 33 - Setting Screen ...................................................................................................................................82
FIGURE 34 - Location of Manual Valve in Purging System (Example) ...................................................................88
FIGURE 35 - Purge System ....................................................................................................................................91
FIGURE 36 - Process and Instrumentation Diagram - Cooling Only.......................................................................92
FIGURE 37 - Chilled / Hot Water, Cooling Water and Waste Exhaust Gas System (Example of One Exhaust Gas
Outlet Flange)........................................................................................................................................................101
FIGURE 38 - Chilled / Hot Water, Cooling Water and Waste Exhaust Gas System (Example of Two Exhaust Gas
Outlet Flange)........................................................................................................................................................102
FIGURE 39 - Wet Storage During Heating Period ................................................................................................109
FIGURE 40 - Dry Storage During Heating Period ................................................................................................. 110
FIGURE 41 - Duhring Diagram PTX Chart (°F)..................................................................................................... 111
FIGURE 42 - Duhring Diagram PTX Chart (°C) .................................................................................................... 112
FIGURE 43 - Specic Gravity - Concentration (°F) ............................................................................................... 113
FIGURE 44 - Specic Gravity - Concentration (°C)............................................................................................... 114
FIGURE 45 - Trouble Sequence Flowchart ...........................................................................................................123
FIGURE 46 - Actions to Take Against Power Failure.............................................................................................124

JOHNSON CONTROLS 9
FORM 155.35-ICOM2.EN.CE/GB (1018)
DATE: 10/30/2018
LIST OF TABLES
TABLE 1 - Insulating Material and Thickness .........................................................................................................35
TABLE 2 - Points Requiring Hot or Cold Insulation ................................................................................................35
TABLE 3 - Typical Operational Range ....................................................................................................................39
TABLE 4 - Contact Specifications ...........................................................................................................................45
TABLE 5 - Scope of Delivery ..................................................................................................................................47
TABLE 6 - Ethernet Interface Specification.............................................................................................................47
TABLE 7 - Communication Specifications ..............................................................................................................47
TABLE 8 - Read Command ....................................................................................................................................48
TABLE 9 - Write Command.....................................................................................................................................49
TABLE 10 - Scope of Delivery of Upper Communication System...........................................................................49
TABLE 11 - Cable Diagram (RS-422 or RS485) .....................................................................................................50
TABLE 12 - Communication Specifications ............................................................................................................52
TABLE 13 - Sound Data..........................................................................................................................................53
TABLE 14 - Rotary Pump Rotation .........................................................................................................................55
TABLE 15 - Liquid Level Gauges (Sight Glass) ......................................................................................................56
TABLE 16 - Failure List ...........................................................................................................................................75
TABLE 17 - Alarm List.............................................................................................................................................80
TABLE 18 - Solenoid Valves ...................................................................................................................................85
TABLE 19 - Purge Valve Operation ........................................................................................................................90
TABLE 20 - Maintenance and Inspection ...............................................................................................................95
TABLE 21 - Exhaust Gas Contaminants.................................................................................................................99
TABLE 22 - Lifespan of Common Parts ................................................................................................................100
TABLE 23 - Tendency of Generation of Scales and Corrosion by Quality of Cooling Water ................................104
TABLE 24 - Chilled / Hot and Cooling Water Quality Control (Maximum Concentrations) ...................................105
TABLE 25 - Wet Storage.......................................................................................................................................107
TABLE 26 - Dry Storage Method ..........................................................................................................................108
TABLE 27 - Troubleshooting the High Temperature Generator ............................................................................115
TABLE 28 - Refrigerant Overcooled .....................................................................................................................116
TABLE 29 - Chilled / Hot Water Suspension.........................................................................................................116
TABLE 30 - Pumps Overloaded or Overheated.................................................................................................... 116
TABLE 31 - Troubleshooting Performance Issues ................................................................................................117
TABLE 32 - Vacuum Pump Troubleshooting ........................................................................................................ 118
TABLE 33 - Abnormal Solution and refrigerant Levels.......................................................................................... 118
TABLE 34 - Interlock Troubleshooting ..................................................................................................................119
TABLE 35 - Pump Troubleshooting.......................................................................................................................119
TABLE 36 - Chilled Water Overcooling Troubleshooting ......................................................................................120
TABLE 37 - Communication Errors.......................................................................................................................120
TABLE 38 - Other Failure Troubleshooting ...........................................................................................................121
TABLE 39 - Damper Failure Troubleshooting .......................................................................................................122

JOHNSON CONTROLS
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FORM 155.35-ICOM2.EN.CE/GB (1018)
DATE: 10/30/2018
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JOHNSON CONTROLS 11
FORM 155.35-ICOM2.EN.CE/GB (1018)
DATE: 10/30/2018
1
INTRODUCTION
YORK YHAU-CE Absorption chiller-heaters are
manufactured to the highest design and construction
standards to ensure high performance, reliability, and
adaptability to all types of air conditioning installa-
tions.
This chiller-heater is for air conditioning or cooling
a manufacturing process. Use this chiller-heater after
installing the chilled / hot water pump, cooling water
pump, cooling tower, valves, strainers, pressure gaug-
es, thermometers, and so on, according to the water
quality information contained in SECTION 7 – MAIN-
TENANCE.
ABOUT THIS MANUAL
This manual and any other document supplied with
the unit are the property of Johnson Controls which re-
serves all rights. This manual may not be reproduced,
in whole or in part, without prior written authorization
from an authorized Johnson Controls representative.
In addition, this manual:
• Should be read thoroughly before attempting to
operate or service the unit.
• Includes suggested best working practices and
procedures, which are issued for guidance only,
and they do not take precedence over the stated in-
dividual responsibility or local safety regulations.
• Contains all the information required for correct
installation and commissioning of the unit, togeth-
er with operating and maintenance instructions.
• Contains detailed procedures, including installa-
tion, commissioning, and maintenance tasks that
must be performed by suitably trained and quali-
ed personnel.
The manufacturer will not be liable for
any injury or damage caused by incorrect
installation, commissioning, operation,
or maintenance resulting from a failure
to follow the procedures and instructions
detailed in this manual.
WARRANTY
Johnson Controls warrants YHAU-CE chiller-heaters
in accordance with the Limited Warranty Engineered
Systems Equipment procedure. Refer to the Limited
Warranty (Form 50.05-NM2).
Johnson Controls warrants all equipment and materi-
als against defects in workmanship and materials for
a period of 18 months from the date of shipment or
12 months from the date of start-up, whichever comes
first, unless a labor or extended warranty has been pur-
chased as part of the contract.
The warranty is limited to parts only replacement and
shipping of any faulty part, or subassembly, which has
failed due to defects in workmanship and materials.
All claims must be supported by evidence that the fail-
ure has occurred within the warranty period, and that
the unit was operated within the designed parameters
specified.
All warranty claims must specify the unit model, serial
number, order number, run hours and starts. Model and
serial number information is printed on the unit identi-
fication plate.
The unit warranty will be void if any modification to
the unit is carried out without prior written approval
from Johnson Controls. For warranty purposes, the fol-
lowing conditions must be satisfied:
• The initial start of the unit must be carried out
by trained personnel from an authorized Johnson
Controls Field Service Ofce.
• Only genuine Johnson Controls approved spare
parts, oils, solutions, chemicals, and refrigerants
must be used.
• All of the scheduled maintenance operations de-
tailed in this manual must be performed at the
specied times by suitably trained and qualied
personnel.
Failure to satisfy any of these conditions will auto-
matically void the warranty. Refer to Limited Warranty
(Form 50.05-NM2) for complete details.
SECTION 1 – GENERAL CHILLER-HEATER AND SAFETY INFORMATION

JOHNSON CONTROLS
12
FORM 155.35-ICOM2.EN.CE/GB (1018)
DATE: 10/30/2018
SECTION 1 – GENERAL CHILLER-HEATER AND SAFETY INFORMATION
HIGH TEMPERATURE AND PRESSURE
CLEANING
High temperature and pressure cleaning methods (for
example, steam cleaning) should not be used on any
part of the pressure system as this may cause operation
of the pressure relief devices. Detergents and solvents,
which may cause corrosion, should also be avoided.
QUALITY ASSURANCE
Units comply with the following directives:
• GB/T 18431-2014
For CE
• EN ISO 12100:2010
• EN 60204-1: 2006+A1: 2009
• EMC Directive 201 4/30 EC
• EN 55011: 2009+A1: 2010 (Group 1, Class A)
• EN 61000-6-2: 2005
The unit must be grounded. No installation or main-
tenance work should be attempted on the electrical
equipment without first switching the power off, then
isolating and locking-off the power supply. Servicing
and maintenance on live equipment must not be at-
tempted. No attempt should be made to gain access to
the control panel or electrical enclosures during normal
operation of the unit.
Components may also have sharp edges. Reasonable
care should be taken when working in contact with
any components to avoid risk of minor abrasions and
lacerations.

JOHNSON CONTROLS 13
SECTION 1 – GENERAL CHILLER-HEATER AND SAFETY INFORMATION
FORM 155.35-ICOM2.EN.CE/GB (1018)
DATE: 10/30/2018
1
SAFETY LABELS
Warning: Risk of fire.
Warning: Risk of gas poisoning.
Warning: This machine may start auto-
matically without prior warning.
Caution: Hot surface.
Warning: Safety relief valve may dis-
charge gas or liquid without prior warning.
Warning: Risk of electric shock.
General attention symbol.
Warning: On isolating the supply it may
take up to 300 seconds for the capacitor
voltage to fall below 50 volts.
For safe operation, read the instructions
first.
Caution: Risk of getting hand caught
in machinery.
Caution: Risk of fall.
Caution: Prohibited.
Warning: Rotating object.

JOHNSON CONTROLS
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JOHNSON CONTROLS 15
FORM 155.35-ICOM2.EN.CE/GB (1018)
DATE: 10/30/2018
2
The principle of refrigeration is the exchange of heat.
In absorption liquid chilling, there are four basic heat
exchange surfaces: the evaporator, the absorber, the
generator, and the condenser. See Figure 1 below.
Like any refrigeration system, absorption chilling uses
evaporation and condensation to remove heat. The ab-
sorption cycle uses water as the refrigerant and lithium
bromide (LiBr) as the absorbent. It is the strong affin-
ity that these two substances have for one another that
makes the cycle work.
CHILLER-HEATER COMPONENTS
The absorption chiller-heater consists of the following
components:
• evaporator
• absorber
• condenser
• generators
• solution heat exchangers to heighten the cycle
efciency
• pumps to circulate the refrigerant and solution in
the cycle
• a purge unit to remove non-condensable gas from
the machine
CONTROL PANEL
The absorption chiller-heater comes with a factory
mounted and pre-wired control system. The control
panel enclosure is equipped with a hinged access door
with lock and key. The control panel includes a touch
panel showing all system parameters in various lan-
guages with numeric data in metric units. For details
of the control panel, see SECTION 6 – OPERATION.
The unit is also equipped with two methods to start and
stop operations:
• touch panel
• external signal
SECTION 2 – PRODUCT DESCRIPTION
LDxxxxx
LD22974
A
B
C
C
D
E
LABEL CHILLER COMPONENTS
AAbsorber
BLow Temperature Generator
CExhaust Gas Inlet
DHigh Temperature Generator
EExhaust Gas Outlet
FIGURE 1 - YHAU-CE COMPONENTS

JOHNSON CONTROLS
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FORM 155.35-ICOM2.EN.CE/GB (1018)
DATE: 10/30/2018
SECTION 2 – PRODUCT DESCRIPTION
HOW IT WORKS (EXHAUST GAS UNITS)
The double effect exhaust gas absorption chiller-heat-
er uses deionized water as the refrigerant and lithium
bromide (LiBr) as the absorbent. It is the strong affin-
ity that these two substances have for each other that
makes the chiller-heater cycle work.
The refrigerant used in the chiller-heater
MUST be deionized water!
The vapor pressure of the lithium bromide solution is
lower than the vapor pressure of the refrigerant. The
vapor pressure of the LiBr solution is directly related
to the amount of refrigerant (water) present in the solu-
tion with the LiBr salt and the solution temperature.
The entire absorption process occurs in almost a com-
plete vacuum.
The evaporator, absorber, condenser, low temperature
generator, and the high temperature generator are shell
and tube construction.
SP1
RP
ABS
EVA
LG-DC
T
LX HX
SP2
XG
LG
(7ºC)
(37ºC)(32ºC)
LD22963
Chilled Water
Outlet
HG ->
CLOSE
Cooling Water
Outlet
Cooling Water Inlet
Chilled Water
Inlet (12ºC)
E -> A Ref
CLOSE
Air Purge
Blower
Air Purge
Damper
Outlet
Damper
Exhaust Gas
Outlet
(120-160ºC)
Bypass
Damper
Inlet
Damper
Exhaust Gas
Inlet
(300-600ºC)
Chilled W ater
Cooling W ater
Refrigerant
Diluted Solution
High Concentrated Solution
Middle Concentrated Solution
COND
FIGURE 2 - EXHAUST GAS ABSORPTION CHILLER-HEATER DIAGRAM (COOLING MODE)

JOHNSON CONTROLS 17
SECTION 2 – PRODUCT DESCRIPTION
FORM 155.35-ICOM2.EN.CE/GB (1018)
DATE: 10/30/2018
2
EVAPORATOR
Liquid refrigerant enters the evaporator where it is dis-
tributed over the top of the tube bundle. The tubes used
in the evaporator are made of low residual phosphorus
deoxidized copper. They are finned. The wall thickness
before the finning is 0.6 mm.
The chilled water returns through the tubes as refrig-
erant droplets cover them. The heat from the water
causes the refrigerant to flash from a liquid to a vapor.
The temperature at which this happens depends on the
evaporator shell pressure. The pressure is dictated by
the absorber section of the chiller-heater.
The refrigerant vapor passes through the mist elimi-
nators. It then flows into the absorber section of the
chiller-heater. As the liquid refrigerant passes through
the evaporator tubes, more and more refrigerant vapor-
izes. The refrigerant that remains in a liquid state at
the bottom drains into the refrigerant tank. It is then
pumped up to the top of the tube bundle where the pro-
cess is repeated.
LD21521
Refrigerant Pump
LG4
Evaporator
(Upper)
Evaporator
(Lower)
Chilled
Water
Out
Chilled
Water
In
Dilute Solution Out
Mist Eliminators
ABSORBER
The concentrated LiBr solution enters the absorber sec-
tion of the chiller-heater. There it is sprayed over the
absorber tube bundle. The tubes used in the absorber
are the same as those used in the evaporator.
Because the vapor pressure of the concentrated solu-
tion is very low, the refrigerant (water) vapor from the
evaporator flows into the absorber where it is absorbed
by the LiBr solution. The concentration of the LiBr so-
lution lowers as the refrigerant (water) is absorbed into
the solution.
This dilution process generates heat. If the solution is
not cooled, the process stops when the solution tem-
perature rises. There is also a corresponding rise in the
vapor pressure.
The water flowing in the absorber tube bundle comes
from the cooling tower. It cools the LiBr solution as it
flows over the tube bundle. This allows the absorption
process to continue. The solution becomes more dilute
as it absorbs the refrigerant vapors. When the LiBr
solution reaches the bottom of the absorber section, it
enters the solution pump. The liquid is then pumped to
the generators.
LD21522
Absorber
(Upper)
Absorber
(Lower)
Concentrated
Solution In
Cooling Water In
Dilute Solution Out
Cooling Water
to Condenser

JOHNSON CONTROLS
18
FORM 155.35-ICOM2.EN.CE/GB (1018)
DATE: 10/30/2018
SECTION 2 – PRODUCT DESCRIPTION
TWO-STEP EVAPORATOR – ABSORBER
The evaporator, as well as the absorber, is split into
two sections. This design allows for lower LiBr solu-
tion concentrations. The lower concentration reduces
pressure, the potential for corrosion, and the risk of
crystallization. It also improves efficiency along with
other advanced components described later.
The two evaporators are in series with respect to the
chilled water flow through the tubes. The chilled wa-
ter flows through the lower evaporator tubes first and
then to the upper evaporator tubes. Each evaporator
operates at a slightly different temperature and pres-
sure. The refrigerant in the lower evaporator boils at
a slightly higher temperature than it does in the upper
evaporator. The chilled water is cooled in two steps as
a result.
The two absorber sections are also split. The strong so-
lution enters the top of the upper absorber and flows
down through the top absorber bundle. It then flows
into the top of the lower absorber section. The strong
solution entering the upper absorber takes advantage
of the lower vapor pressure. The lower pressure allows
the upper evaporator to operate at a lower pressure and
temperature.
When the LiBr solution enters the lower absorber sec-
tion it is diluted due to the refrigerant vapor that boiled
off in the upper evaporator. At this lower concentration,
the solution vapor pressure would not be sufficient to
provide an evaporator pressure low enough to satisfy
the leaving chilled water design. However, the lower
evaporator is the first step of the chilled water cooling
cycle. The dilute solution’s vapor pressure is enough to
maintain the required temperature and pressure in the
lower evaporator.
The cooling tower water enters the lower absorber sec-
tion first. This keeps the vapor pressure of the weaker
solution as low as possible.
Both the refrigerant (water) and LiBr dispersion sys-
tem are gravity fed and made of stainless steel.
LD19980_a3
Chilled
Water
Out
Chilled
Water
In
Refrigerant
Concentrated
LiBr
Dilute (weak)
Solution out
Cooling
Water In
Evaporator
(Upper)
Absorber
(Upper)
Absorber
(Lower)
Evaporator
(Lower)
PLATE TYPE HEAT EXCHANGERS
The three plate solution heat exchangers (the high tem-
perature solution heat exchanger, the low temperature
solution heat exchanger), and the low temperature LTG
refrigerant condensate heat exchanger; allow the unit
to operate more efficiently.
The diluted (weak) lithium bromide solution leaving
the absorber section is pumped through various plate
type heat exchangers before it enters the high tempera-
ture generator and low temperature generator sections.
These plate type heat exchangers provide cycle effi-
ciency by pre-heating the dilute solution. Pre-heating
the dilute solution reduces the load of the driving heat
source in the high temperature generator section. The
concentrated solution flows out of the generators and
back through the various heat exchangers.
The relatively high temperature solution streams from
the two generators are used to pre-heat the weak solu-
tion stream leaving the absorber.
The variable frequency drive on the solution circula-
tion pump, as well as the solution spray pump, helps
achieve superior performance at part loads through
savings in energy consumption.

JOHNSON CONTROLS 19
SECTION 2 – PRODUCT DESCRIPTION
FORM 155.35-ICOM2.EN.CE/GB (1018)
DATE: 10/30/2018
3
PARALLEL FLOW
The lithium bromide solution flow type is a parallel
flow cycle. The flow of weak solution pumped from
the absorber initially passes through the low tempera-
ture solution heat exchanger. This improves the oper-
ating efficiency by preheating the weak solution. The
solution flow divides into two paths. One leads to the
high temperature generator through the high tempera-
ture solution heat exchanger. The other leads to the low
temperature generator in parallel.
LD19880_2
Low Temp.
Heat Exchanger
Concentrated
Solution Out
Dilute
Solution Out
Dilute
Solution Out
Concentration
Solution In
HIGH TEMPERATURE GENERATOR (HTG)
The high temperature generator section is a flooded,
smoke tube design. The exhaust gas passes through the
tubes. As it does, it heats the pre-heated dilute solution
from the high temperature heat exchanger.
The hot refrigerant vapor boiled off from the dilute
solution is sent to the low temperature generator. The
strong solution left behind is returned to the high tem-
perature heat exchanger.
LD21523
Dilute
Solution
In
Concentrated
Solution Out

JOHNSON CONTROLS
20
FORM 155.35-ICOM2.EN.CE/GB (1018)
DATE: 10/30/2018
SECTION 2 – PRODUCT DESCRIPTION
LOW TEMPERATURE GENERATOR
The low temperature generator is a falling liquid film
type where the hot refrigerant from the high tempera-
ture generator heats the dilute solution. The refrigerant
vapor from the high temperature generator then con-
denses into liquid and flows to the condenser.
LD26807
Low Temp.
Generator
CONDENSER
The refrigerant vapor from the low temperature gener-
ator as well as the condensed refrigerant from the high
temperature generator enter the condenser. There, they
condense into a liquid state using the cooling (condens-
er) water from the absorber section. The cooled refrig-
erant is sent to the bottom evaporator section through a
U-pipe (liquid seal). This completes the cooling cycle.
LD19880_a5
Condenser
Cooling Water Outlet
Concentration
Solution In