York OPTIVIEW YIA D User manual

OPERATION MANUAL
SINGLE STAGE YIA
ABSORPTION CHILLERS
WITH OPTIVIEWTM CONTROL CENTER
Supersedes: Form 155.21-O1 (410) Form 155.21-O1 (615)
YIA MOD D
SINGLE STAGE
STEAM / HOT WATER
WITH OPTIVIEWTM CONTROL CENTER
1A1 through 14F3
LD13714
Issue Date:
June 12, 2015

JOHNSON CONTROLS
2
FORM 155.21-O1 (615)
This equipment is a relatively complicated apparatus.
During installation, operation, maintenance or service,
individuals may be exposed to certain components or
conditions including, but not limited to: refrigerants,
oils, 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 respon-
sibility of 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
which it is situated, as well as severe personal injury or
death to themselves and people at the site.
IMPORTANT!
READ BEFORE PROCEEDING!
GENERAL SAFETY GUIDELINES
This document is intended for use by owner-authorized
operating/service personnel. It is expected that this in-
dividual possesses 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 under-
stood this document and any referenced materials. This
individual shall also be familiar with and comply with
all applicable 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 areas of potential hazard:
WARNING indicates a potentially
hazardous situation which, if not
avoided, could result in death or se-
rious injury.
DANGER indicates an imminently
hazardous situation which, if not
avoided, will result in death or serious
injury.
CAUTION identies a hazard which
could lead to damage to the machine,
damage to other equipment and/or
environmental pollution. Usually an
instruction will be given, together with
a brief explanation.
External wiring, unless specied as an optional connection in the manufacturer’s product
line, is NOT to be connected inside the micro panel cabinet. Devices such as relays, switches,
transducers and controls may NOT be installed inside the micro panel. NO external wir-
ing is allowed to be run through the micro panel. All wiring must be in accordance with
YORK’s published specications and must be performed ONLY by qualied Johnson Controls
personnel. Johnson Controls will not be responsible for damages/problems resulting from
improper connections to the controls or application of improper control signals. Failure to
follow this will void the manufacturer’s warranty and cause serious damage to property or
injury to persons.
NOTE is used to highlight additional
information which may be helpful to
you.

FORM 155.21-O1 (615)
3
JOHNSON CONTROLS
NOMENCLATURE
ASSOCIATED LITERATURE
DESCRIPTION FORM NO.
OPERATION – YIA UNIT 155.21-OM1
SERVICE – YIA UNIT 155.21-M2
INSTALLATION – YIA UNIT 155.21-N1
SERVICE – YIA OPTIVIEW CONTROL CENTER 155.21-M1
RENEWAL PARTS – YIA OPTIVIEW CONTROL CENTER 155.21-RP1
RENEWAL PARTS – YIA UNIT 155.21-RP2
WIRING DIAGRAM – YIA UNIT 155.21-W1
WIRING DIAGRAM – YIA FIELD CONTROL MODIFICATIONS 155.21-W2
WIRING DIAGRAM – YIA FIELD CONNECTIONS 155.21-W3
VOLTAGE CODE
17=208-3-60
28=230-3-60
46=460-3-60
50=380/400/415-3-50
58=575-3-60
YIA ST 1A1 46 C S D
SPECIAL
S = Std Tubes
X = Special Tubes
COOLING ONLY
DESIGN LEVEL
UNIT SIZE
1A1 through 14F3
HEAT SOURCE
ST=Steam
HW=Hot Water
UNIT TYPE
YORK IsoFlow Absorption Chiller
CHANGEABILITY OF THIS DOCUMENT
In complying with YORK/Johnson Controls policy
for continuous product improvement, the information
contained in this document is subject to change without
notice. While Johnson Controls makes no commitment
to update or provide current information automatically
to the manual owner, that information, if applicable,
can be obtained by contacting the nearest YORK/
Johnson Controls Service Ofce.
It is the responsibility of operating/service personnel
as to the applicability of these documents to the equip-
ment in question. If there is any question in the mind
of operating/service personnel as to the applicability of
these documents, then, prior to working on the equip-
ment, they should verify with the owner whether the
equipment has been modied and if current literature
is available.

JOHNSON CONTROLS
4
FORM 155.21-O1 (615)
SECTION 1 DESCRIPTION OF SYSTEM AND FUNDAMENTALS OF OPERATION .. 5
SECTION 2OPTIVIEW CONTROL CENTER .................................................... 11
Setpoints and Conguration..............................................................................................12
Unit Operation ...................................................................................................................12
Unit Operation Under Power Failure Condition.................................................................19
OptiView Control Center....................................................................................................20
Interface Conventions .......................................................................................................21
Navigation ...................................................................................................................22
Languages ...................................................................................................................22
Analog Input Ranges.........................................................................................................24
Home Screen ...................................................................................................................26
Evaporator / Absorber Screen...........................................................................................28
Generator / Condenser Screen .........................................................................................30
System Screen..................................................................................................................32
Purge Screen ...................................................................................................................34
Purge Trend Screen ..........................................................................................................36
Control Valve Screen.........................................................................................................37
Setpoints Screen...............................................................................................................38
Diagnostics Screen ...........................................................................................................42
Sales Order Screen...........................................................................................................43
History Screen...................................................................................................................44
Trend Screen ...................................................................................................................45
Trend Setup Screen ..........................................................................................................48
Triggers Screen.................................................................................................................49
Display Messages .............................................................................................................51
Status Messages.........................................................................................................51
Run Messages ............................................................................................................51
Start Inhibit Messages.................................................................................................53
Warning Messages......................................................................................................53
Routine Shutdown Messages......................................................................................57
Cycling Shutdown Messages ......................................................................................57
Safety Shutdown Messages........................................................................................58
Equipment Status Messages.......................................................................................63
SECTION 3PRINTERS......................................................................................65
Printer Setup.....................................................................................................................66
Control Center Setup ........................................................................................................67
Downloading Histories to a Laptop ...................................................................................71
TABLE OF CONTENTS
LIST OF FIGURES
FIGURE 1 – MODEL YIA OPTIVIEW CHILLER .............................5
FIGURE 2 – FLOW DIAGRAM.........................................................9
FIGURE 3 – OPTIVIEW CONTROL CENTER ............................ 20
FIGURE 4 – YIA OPTIVIEW NAVIGATION .................................. 23
FIGURE 5 – HOME SCREEN ....................................................... 26
FIGURE 6 – EVAPORATOR / ABSORBER SCREEN................ 28
FIGURE 7 – GENERATOR / CONDENSER SCREEN .............. 30
FIGURE 8 – SYSTEM SCREEN ................................................... 32
FIGURE 9 – PURGE SYSTEM SCREEN.................................... 34
FIGURE 10 – PURGE TREND SCREEN.................................... 36
FIGURE 11 – CONTROL VALVE SCREEN ................................ 37
FIGURE 12 – SETPOINTS SCREEN.......................................... 38
FIGURE 13 – DIAGNOSTICS SCREEN..................................... 42
FIGURE 14 – SALES ORDER SCREEN .................................... 43
FIGURE 15 – HISTORY SCREEN ............................................... 44
FIGURE 16 – TREND SCREEN................................................... 46
FIGURE 17 – TREND SETUP SCREEN..................................... 48
FIGURE 18 – TRIGGERS SCREEN............................................ 49
FIGURE 19 - PRINTERS ................................................................ 65
FIGURE 20 – SAMPLE PRINTOUT (OPERATING DATA) ....... 67
FIGURE 21 – SAMPLE PRINTOUT (LAST NORMAL STOP) .. 68
FIGURE 22 – SAMPLE PRINTOUT (SALES ORDER) ............. 68
FIGURE 23 – SAMPLE PRINTOUT (HISTORY)........................ 69
FIGURE 24 – SAMPLE PRINTOUT (PURGE TREND)............. 69
FIGURE 25 – SAMPLE PRINTOUT (SETPOINTS)................... 67
FIGURE 26 – COMMUNICATIONS BLOCK DIAGRAM ........... 71

FORM 155.21-O1 (615)
5
JOHNSON CONTROLS
SECTION 1
DESCRIPTION OF SYSTEM AND FUNDAMENTALS OF OPERATION
GENERAL INFORMATION
The chiller is controlled by a modern state of the art
Microcomputer Control Center that monitors its op-
eration. The Control Center is programmed by the
operator to suit job specications. The operating status,
temperatures, pressures, and other information pertinent
to operation of the chiller are automatically displayed
and read on a graphic display. Other display screens
can be observed by pressing the keys as labelled on the
control center.
The principle of refrigeration is the exchange of heat
and, in absorption liquid chilling, there are four basic
heat exchange surfaces: the evaporator, the absorber, the
generator and the condenser.
In absorption chilling, the refrigerant is water but, like
any refrigeration system, absorption chilling uses evapo-
ration and condensation to remove heat. To maintain
effective evaporation and condensation, absorption
chilling employs two shells which operate at different
controlled vacuums.
The lower shell (Evaporator and Absorber) has an
internal absolute pressure of about one one-hundredth
that of the outside atmosphere - or six millimeters of
mercury, a relatively high vacuum. The vacuum allows
water (the refrigerant) to boil at a temperature below that
of the liquid being chilled. Chilled liquid entering the
evaporator can be cooled for air conditioning or process
cooling applications.
Evaporator
The section of a chiller that is responsible for removing
the heat from the chilled water circuit, thus cooling the
chilled water to be used to cool a building, a manufac-
turing process, or whatever application it is intended.
Typically, the chilled water is cooled from 54°F - 44°F
(12.2 - 6.6°C).
In an absorption chiller, the pure refrigerant generated in
the generator is cooled and condensed in the Condenser
and supplied to the Evaporator. Here, it is immediately
exposed to a much lower pressure which causes some
immediate ashing (boiling). Most of the refrigerant
cools to the saturation temperature and remains in liquid
form. It is then pumped and sprayed over the Evapora-
tor tube bundle. As the refrigerant passes over the outer
surface of the tubes, it evaporates (i.e. ashes or boils)
because of the low pressure, approximately 5.5-6.5
mmHg which is equivalent to a saturation temperature
of 36-41°F (2.2-5°C). The refrigerant vapor is then
immediately drawn through the eliminator towards the
Absorber. This vacuum is caused by the hygroscopic
action, the afnity Lithium Bromide has for the refrig-
erant vapor.
LD14498
FIGURE 1 – MODEL YIA ABSORPTION CHILLER

JOHNSON CONTROLS
6
FORM 155.21-O1 (615)
Description of System and Fundamentals of Operation
Absorber
The concentrated solution coming back from the genera-
tor is partially mixed with solution from the absorber
section then pumped to a solution spray header where
it is sprayed over the tubes in the absorber. Refrigerant
vapor is absorbed into the solution and the solution is
thus diluted. This diluted solution is collected at the
bottom of the absorber where it is again pumped to the
generator.
Generator
The diluted solution is then pumped through the heat
exchanger, where it is preheated by hot concentrated so-
lution from the generator. The heat exchanger improves
the efciency of the cycle by reducing the amount of
steam or hot water required to heat the dilute solution
in the generator. The dilute solution then continues to
the upper shell containing the Generator and Condenser,
where the absolute pressure is approximately one-tenth
that of the outside atmosphere, or seventy millimeters
of mercury. The dilute solution ows over the generator
tubes and is heated by steam or hot water passing through
the interior of the tubes. The amount of heat input from
the steam or hot water is controlled by a motorized valve
and is in response to the required cooling load. The
hot generator tubes boil the dilute solution, releasing
refrigerant vapor.
Condenser
The refrigerant vapor rises to the condenser and is
condensed by the cooler tower water running through
the condenser tubes. The liquid refrigerant ows back
to the lower shell, and is once again sprayed over the
evaporator. The refrigerant cycle has been completed.
Now the concentrated lithium bromide solution ows
from the generator back to the absorber in the lower
shell, ready to absorb more refrigerant. Its cycle has
also been completed.
Solution Heat Exchanger
A counterow Solution to Solution Heat Exchanger. A
component that exchanges heat between two streams of
Lithium Bromide solution. The hotter the solution being
supplied to the generators is, the less heat that needs to
be added, thus improving efciency. Likewise, the cooler
the solution is going to the Absorber, the less heat that
needs to be removed by the cooling tower. Therefore, the
heat exchanger preheats the solution going to the genera-
tor and cools the solution going to the Absorber.
Solution Pump
A hermetically sealed, centrifugal pump located under
the absorber. It receives diluted lithium bromide solu-
tion from the absorber shell and circulates it through a
heat exchanger, then up to the generator. The discharge
of this pump operates in a pressure that is above atmo-
spheric pressure. The pump is cooled by the solution it
is pumping.
Refrigerant Pump
A hermetically sealed, centrifugal pump located down-
stream of the evaporator outlet box. This pump receives
liquid refrigerant from the evaporator and discharges it
back up to the evaporator sprays. It continues to re-cir-
culate the refrigerant while the chiller is operational.
Purge Pump
An external pump connected to the purge system of the
unit. This pump is used to evacuate non-condensables
from the unit.
Eductor
An eductor is a liquid-powered jet pump. Jet pumps
have no moving parts and use a high-pressure stream
of liquid to pass through a nozzle, causing a portion of
a low-pressure stream coming into the side of the pump
to combine with the nozzle stream. This causes a reduc-
tion in pressure at the low-pressure inlet and induces the
rest of the low-pressure inlet substance to ow into the
body of the pump.
On IsoFlow™ units, an eductor is used in place of a
centrifugal pump to induce strong concentrated solu-
tion exiting the generator outlet box to combine with
weak concentrated solution exiting the solution pump
discharge, before going to the absorber spray header.
Level Switches
There are two level switches that sense liquid levels on
the IsoFlow units. Both are located in the refrigerant
circuit. Switch (1F) is at the side of the evaporator re-
frigerant outlet box, and senses the level in the box. At
low levels in this box, the 1F switch will open, causing
the control panel to initiate corrective procedures to keep
the unit from running out of refrigerant. Switch (3F) is
located just before the inlet of the Buffalo refrigerant
pump. It’s main purpose is to keep the Buffalo pump
from cavitation and eventual overheating.

FORM 155.21-O1 (615)
7
JOHNSON CONTROLS
1
Power Panel
The power panel serves as single-point wiring location
for the unit’s incoming power wiring. It houses all the
unit pump contactors and overloads, as well as fuses and
terminal lugs for ease of serviceability. A transformer
is included to reduce the incoming unit voltage to the
micropanel.
Isolation Valve
One isolation valve is located at each Buffalo Pump inlet
and outlet. It is a positive sealing, buttery type valve
mounted between standard ANSI anges. Each valve
incorporates an EPDM liner on the valve face to act as
a sealing surface. When closed, the valves will isolate
the unit vacuum from the pump area to offer ease of
serviceability when servicing the pumps.
Hot Water Valve
The capacity control valve which regulates the amount
of hot water to the generator (Hot Water units only).
Steam Valve
The capacity control valve which regulates the amount
of steam to the unit (Steam units only).
Oil Trap
The oil trap is located between the purge pump suction
connection and the unit. It is designed so it will hold one
complete oil charge of the vacuum pump. In the event
air was to get into the unit through the vacuum pump,
the low pressure in the absorber would induce the oil
into the system. Therefore, the oil trap is used as a safety
measure to protect the absorption unit from the oil.
Orifice
A restriction in a liquid line for the purpose of reducing
the internal diameter of the line. Usually created by a
blank piece of metal with a small hole drilled into it,
to create a pressure differential when a liquid passes
through it.
Pass Baffle
A division plate or plates (bafes) inserted into a water
box to create chambers which force the water to pass
through different portions of the tube bundle, called
passes. Although the pressure drop increases with in-
creasing passes, the trade-off for heat transfer optimiza-
tion and nozzle locations are justied.
Rupture Disk
Although IsoFlow™ absorption units operate at less than
atmospheric pressure (a vacuum), if certain safeties fail
and/or incorrect valves are closed, the unit could experi-
ence higher pressures in certain chambers. Therefore, a
pressure relief apparatus, a rupture disk, is added.
Automatic De-crystallization Pipe (ADC)
The automatic de-crystallization pipe is a U-shaped line
coming off the generator solution outlet box and termi-
nating in the absorber shell. During normal unit opera-
tion, this line has no ow in it. If crystallization were to
occur, it would normally be in the strong solution side of
the heat exchanger. This blockage would back up solu-
tion into the generator solution and into the automatic
de-crystallization pipe. Once the hot solution goes into
the ADC pipe, it bypasses the heat exchanger and goes
directly into the absorber shell, thus heating the solution
in the absorber shell. The heated solution in the absorber
then heats up the crystallized heat exchanger from the
opposite side of the tubes and causes the crystallized
lithium bromide to dissolve back into solution.
ADC Flush Line
This line runs between the solution pump discharge and
the ADC line. When the solution pump runs, weak solu-
tion is constantly supplied to the ADC line. This keeps
the ADC line from crystallizing, due to it being exposed
to the low pressures generated within the absorber while
the unit is running.
Alcohol (2-Ethylhexanol)
A liquid added to an absorption chiller (about 1% by
mass) to enhance the heat and mass transfer in the Ab-
sorber. It is an octyl alcohol whose chemical name is
2-Ethyl-1-Hexanol (C8H18O) with a molecular weight
of 130.2, a boiling point of 364.3°F (184.6°C), and a
ash point of 177.8°F (81°C) at 760 mmHg. Having a
colorless, clear appearance, it has a somewhat pungent
odor. By adding 2- Ethylhexanol to the absorption cycle,
overall unit performance increases by 5-15%. In addi-
tion, cycle temperatures, pressures, and concentrations
tend to decrease with the addition of 2-Ethylhexanol.
Concentration
The percent by weight of lithium bromide present in
solution. New solution is sent with a concentration of
53%.

JOHNSON CONTROLS
8
FORM 155.21-O1 (615)
Description of System and Fundamentals of Operation
Condenser (Tower) Water
The external water loop which is used to remove heat
from the unit. This water passes rst through the Ab-
sorber, then the Condenser. Typical temperatures are
entering the Absorber at 85°F (29.4°C), leaving the
Absorber (entering the Condenser, i.e. crossover) at 92°F
(33.3°C), and leaving the Condenser at 95°F (35°C).
Some external means of removing this heat is necessary.
Typically a cooling tower is used for this application.
Inhibitor
An inhibitor is an additive in the solution that helps
promote the formation of a protective iron oxide lm
on the interior ferrous surfaces in the unit. This lm is
called Magnetite and can be seen as a black coating. It
is this protective coating, not the actual inhibitor, which
helps to reduce internal corrosion rates in the machine.
All new solution that comes with the chiller has the
recommended amount of inhibitor included in it.
Non-condensables
A gaseous substance that cannot be liquied or con-
densed at the pressure and temperature surrounding it.
The presence of non-condensables in the unit can cause
severe performance problems. Non-condensables appear
in two forms in the unit:
1. Internally generated non-condensables are formed
as a by-product of corrosion.
2. Air may be drawn into a unit via leaks.
Non-condensables that collect in the absorber section
of the unit blanket the heat transfer tubes and raise the
internal pressure, thus reducing the absorber’s ability
to capture the refrigerant vapor. Non-condensables that
collect in the high side of the unit end up in the con-
denser section, where they blanket the condenser tubes,
reducing the condenser’s capacity. It should be noted
that the only non-condensable that is not self-generated
by the chemistry inside the unit is nitrogen. Air is over
70% nitrogen; an air leak is the only external source
of nitrogen. All other non-condensables are generated
by various chemical reactions that occur internally for
many different reasons.
Refrigerant
(Water, H
2
O). Deionized water is used as the refrigerant.
Solution
A mixture of deionized water with a certain % by weight
of dissolved lithium bromide (LiBr). Corrosion inhibi-
tors are also added to the solution to reduce the internal
corrosion rates in the unit.
2SOL
(Stabilizer refrigerant solenoid valve)
This solenoid valve is located on a separate line that goes
between the discharge of the refrigerant pump to the
generator's (return) strong solution line. This solenoid
valve works in conjunction with the ADC (Automatic
Decrystallization Line) & Short Dilution Cycle. When
RT2 senses an increase in temperature to 160°F (71.1°C)
in the ADC line, the 2SOL will be energized for a certain
period of time, this will allow the transfer of refrigerant
from the refrigerant pump to the generator's drain line,
thus diluting the solution to the shell side of the solu-
tion to the shell side of the solution-to-solution (STS)
heat exchanger. This valve can be energized manually
from the control panel. This function acts as a "blow
down" feature to accelerate the clean up of contaminated
refrigerant.
3SOL
(Unloader refrigerant level solenoid valve)
This solenoid valve is located on a separate line between
the discharge of the solution pump and the evaporator
refrigerant outlet box. Its control is via the 1F refrigerant
level switch. When 1F opens, the 3 SOL is energized to
allow the transfer of solution from the solution pump
to the evaporator refrigerant outlet box. This helps the
chiller stay on line at light loads with low condenser
water temperatures and keeps the refrigerant pump
from cavitation by providing a sufcient supply of
refrigerant.
1F
(Refrigerant level switch)
This switch is located in a separate chamber on the side
of the evaporator refrigerant outlet box. It senses if a
level is present or not in this box. If the level of refriger-
ant is not present the control logic will act to satisfy the
refrigerant pump needs and sustain unit operation.
3F
(Refrigerant pump level switch)
This switch is located just before the refrigerant pump
suction connection. It is used in conjunction with 1F
refrigerant level switch to ensure a steady supply of
refrigerant to the pump. When the refrigerant level de-
creases below the 3F switch, the logic control will start
the count down on the preset refrigerant pump shutdown
delay time. If the 3F switch closes before the shutdown
delay time elapses, the count down is stopped and the
refrigerant pump continues to operate.

FORM 155.21-O1 (615)
9
JOHNSON CONTROLS
1
FIGURE 2 – FLOW DIAGRAM
FROM GENERATOR
KEY
CONCENTRATED
SOLUTION (LiBr)
DILUTE SOLUTION
(LiBr)
INTERMEDIATE
SOLUTION (LiBr)
REFRIGERANT LIQUID
LOW TEMPERATURE
REFRIGERANT LIQUID
HIGH TEMPERATURE
DILUTE PURGE LIQUID
GAS / VAPOR
TOWER
WATER
CHILLED LIQUID
CONDENSER
STEAM OR HOT WATER
CONTROL VALVE
CHILLED
WATER
OUTLET
CHILLED
WATER
INLET
EVAPORATOR
ABSORBER
TOWER
WATER
INLET
HOT WATER OR
STEAM
PT1
HT1
RT4
PT4
VP10
VP2
***VP1
VP4
HP1
AUTOMATIC DE-CRYSTALLIZAT ION PIPE
TO GENERATOR
SOL
PUMP
REF.
PUMP
1F
GENERATOR
GENERATOR
OUTLET
PURGE
TANK
VS12
VS13
VR9
VR10
* Orifices may differ between various models.
** PT2 is for Steam units only.
*** May differ between various models.
TOWER WATER
OUTLET
VENT
Purge
Pump
Abs. Press.
Gauge
Oil Trap
7 SOL
PT3
8 SOL
VP8
3F
VS3
VR40
VS18
VS17
VS20
VR11
VR8
VS19
RT7
RT9
**PT2
RT1
RT6
RT5
RT8
LRT
3SOL
(Unloader)
2SOL
(Stabilizer)
RT10
DRAIN
RT3RT2
LD13806a

JOHNSON CONTROLS
10
FORM 155.21-O1 (615)
OptiView Control Center
THIS PAGE INTENTIONALLY LEFT BLANK

FORM 155.21-O1 (615)
11
JOHNSON CONTROLS
SECTION 2
OPTIVIEW CONTROL CENTER
INTRODUCTION
The YORK OptiView™ Control Center is a micropro-
cessor based control system for YORK chillers.
The panel comes congured with a full screen LCD
Graphic Display mounted in the middle of a keypad
interface. The graphic display allows the presentation
of several operating parameters at once. In addition,
the operator may view a graphical representation of the
historical operation of the chiller as well as the present
operation. For the novice user, the locations of various
chiller parameters are clearly and intuitively marked.
Instructions for specic operations are provided on
many of the screens.
The graphic display also allows information to be repre-
sented in both English (temperatures in °F and pressures
in PSIG) and Metric (temperatures in °C and pressures
in kPa) mode. The advantages are most apparent in the
ability to display English, German, Italian, Spanish, and
Portuguese languages.
The Control Center continually monitors the system op-
eration and records the cause of any shutdowns (Safety,
Cycling or Normal). This information is recorded in
memory and is preserved even through a power failure
condition. The user may recall it for viewing at any time
by accessing the History Screen. During operation, the
user is continually advised of the operating conditions
by various status and warning messages. In addition, it
may be congured to notify the user of certain conditions
via alarms. A complete listing of shutdown, status, and
warning messages is attached in the Display Messages
section of this book.
There are certain screens, displayed values, program-
mable Setpoints and manual control shown in this book
that are for Service Technician use only. They are only
displayed when logged in at SERVICE access level
or higher.
These parameters affect chiller opera-
tion and should NEVER be modied by
anyone other than a qualied Service
Technician.
The OptiViewTM control center expands the capabilities
of remote control and communications. By providing a
common networking protocol through E-Link Gateway,
YORK Chillers not only work well individually, but
also as a team.
The E-Link Gateway provides communications for
YORK chillers with Building Automation Systems
(BAS). The E-link is a circuit board that can be installed
directly in the OptiView Panel or can be supplied already
mounted in a line voltage capable enclosure.
This new protocol allows increased remote control of the
chiller, as well as 24-hour performance monitoring via
a remote site. In addition, compatibility is maintained
with the present network of E-Link communications.
The chiller also maintains the standard digital remote
capabilities as well. Both of these remote control ca-
pabilities allow for the standard Energy Management
System (EMS) interface:
1. Remote Start
2. Remote Stop
3. Remote Leaving Chilled Liquid Temperature
Setpoint adjustment (0-10VDC) or Pulse Width
Modulation
4. Remote Load Limit Setpoint adjustment
(0-10VDC) or Pulse Width Modulation
5. Remote “Ready to Start” Contacts
6. Safety Shutdown Contacts
7. Cycling Shutdown Contacts
8. See 155.21-W2 for additional connection details
The chiller operating program resides in the OptiView
control center Microboard. The control center could be
equipped with the following Microboard:
•031-02430-005 – The program resides in non-
removable onboard memory. The software version
is C.OPT.15.xx.yzz, and is viewable on the DIAG-
NOSTICS Screen in SERVICE access level. The
program can be upgraded by downloading a new
program from a Program Card. Program Cards are
shirt-pocket-size portable memory storage devices
available from YORK.
2

JOHNSON CONTROLS
12
FORM 155.21-O1 (615)
Software versions (C.OPT.15.xx.yzz) are alpha-numeric
codes that represent the application, language package
and revision levels per below. Each time the controls
portion or language section is revised, the respective
revision level increments.
•C – Commercial chiller
•OPT - Used on Microboard 031-02430-000
•15 – YIA Absorption Chiller
•xx - controls revision level (00, 01, etc)
•y – language package (0=English only, 1=NEMA,
2=CE, 3=NEMA/CE )
•zz – language package revision level (00, 01, etc)
SETPOINTS AND CONFIGURATION OPTIONS
The operating setpoints and congurations can be ac-
cessed thru the OptiView control panel. Modications to
the setpoints and congurations can only be done from
the OPERATOR or SERVICE level.
UNIT OPERATION
Start and Stop the Unit
The unit can be started using the main switch, using a
remote signal when the unit is in remote mode or by a
scheduled starting.
If the steam or hot water control valve is open less than
10% and the leaving chilled liquid temperature is at or
above setpoint run is initiated and the chilled liquid and
Condenser pump contacts close. The chilled and con-
denser liquid ow switches are bypassed for 30 seconds
each after the respective pump contacts close, or until the
respective ow switch closes, if less than 30 seconds. If
the unit is kept from starting because the leaving liquid
temperature is below setpoint, a cycling shutdown shall
be initiated.
For Low Leaving Chilled Liquid Temperature (LCHLT)
shutdowns only, the system starting temperature is de-
termined by adding 2.0°F(1.1°C) to the leaving chilled
water setpoint.
If the condenser or chilled liquid ow switch does not
close within 30 seconds of the pump contacts closure, a
safety shutdown is performed.
When run conditions are met and ow switches closed for
2 continuous seconds, startup continues as follows:
If the unit is equipped with Franklin Pumps, the steam/
hot water shut-off valves are energized and the refrigerant
pump and generator pump (50 Hz Models YIA-10E3 -
YIA-14F3) are started.
If the unit is equipped with Buffalo pumps, refrigerant
pump operation is controlled by oat/level switches 1F
and 3F. The refrigerant pump is not started until both
refrigerant level oat switches 3F and 1F close and the
“REFRIGERANT PUMP STARTUP DELAY” setpoint
timer has elapsed as follows: The refrigerant level will
rise to a level that causes 3F to close. As the level con-
tinues to rise, it will cause 1F to close. When 1F closes,
the REFRIGERANT PUMP STARTUP DELAY setpoint
timer is started. If 1F remains closed for the duration of
the timer, the refrigerant pump is started when the pro-
grammed delay has elapsed.
After the refrigerant pump has been started, if the refrig-
erant level decreases to the extent that rst 1F opens and
then 3F opens, the REFRIGERANT PUMP SHUTOFF
DELAY setpoint timer is started when 3F opens. If 3F
remains open for the duration of the timer, the refriger-
ant pump is shut off after the programmed delay has
elapsed. When the unit rst enters SYSTEM RUN or
after a refrigerant pump shutdown has occurred due to low
refrigerant level, the Chiller REFRIGERANT LEVEL
SHUTDOWN setpoint timer is started. The programmed
value is the number of minutes the unit is allowed to run
without the refrigerant pump running. If the refrigerant
pump is not started before the timer has elapsed, a safety
shutdown is initiated.
To assure that both 1F and 3F oat/level switches are
operational, the program compares the state of 1F to 3F.
Since each oat/level switch closes as the refrigerant level
rises against it and opens when the level decreases below
the device, and 1F is at a higher level than 3F, it is not
possible that 1F would be closed if 3F is still open; unless
one of the switches is malfunctioning. If this condition is
detected, a warning is displayed.
The unit will perform a cycling shutdown without initiat-
ing dilution when LCHLT is less than LCHLT Setpoint
- LCHLT Shutdown Setpoint (see Setpoints Section).
During this shutdown, dilution is initiated if the strong
solution temperature drops below a calculated value for
crystallization. When the local entered LCHLT setpoint
is manually changed, LCHLT must be below both the
new and previous LCHLT setpoint values by the offset
amount to initiate cycling shutdown until 30 minutes
have elapsed from the time of change. After 30 minutes,
low LCHLT cycling shutdown is based only on the new
OptiView Control Center

FORM 155.21-O1 (615)
13
JOHNSON CONTROLS
2
setpoint. This allows the chiller to remain running while
adjusting LCHLT to a new setpoint. If a setpoint change
is entered more than once within 5 minutes of the rst
entry, the nal entry is considered a single change and
the control works to that value and the value before any
entry changes were made. The 30 minute delay for cy-
cling shutdown temp entered does NOT apply to remote
command setpoint changes.
The unit can be stopped at any moment by pressing the
main switch to the stop position, by receiving a stop order
remotely when the unit is in remote mode, when there is
a scheduled stop or by requesting a soft shutdown on the
user interface.
When the unit is stopped using the main switch or by
applying a scheduled stop, the control valve closes and a
dilution cycle is performed immediately. When the unit is
stopped remotely with a soft shutdown selected or by a lo-
cal soft shutdown. The loading of the unit will be linearly
decreased on a user programmed ramp down time to the
valve unload limit (programmed at SERVICE access from
10% to 20%) before shutting the unit down, and then a
dilution cycle is performed. This results in less shock to
the customer's steam/hot water supply system.
Once the Soft Shutdown initiates ramp down, it will
continue until the user dened unloading threshold is
met, regardless of any run/stop status change before
shutdown.
If the unit is operating under a load condition that is equal
to the low unload limit setpoint, when the soft shutdown
is initiated, the unit will go into an instant shutdown.
Automatic Load Control
Three subcontrols interacting constantly determine load
valve position. They are "Leaving Chilled Liquid Tem-
perature Control (LCHLT Control)", "Strong Solution
Control (SCC Control)" and load limits. The control
performs an analysis of all of them and never exceeds
the lowest limit.
Leaving Chilled Liquid Temperature
(LCHLT) Control
The "Leaving Chilled Water Temperature Control" is a
fuzzy logic control, to match the leaving chilled liquid
temperature with leaving chilled liquid temperature
setpoint.
Strong Solution Concentration (SSC) Control
The "Strong Solution Concentration Control" is a fuzzy
logic control; to avoid the unit reaching concentrations
that can crystallize the solution.
Load Limits
Additionally, the following limits may exist:
• Pulldown Limit Active; if True, the control limits
the max. load to the pulldown current load value.
• Soft shutdown in process; if True, the control lim-
its the max. load to the ramp down current load
value.
• Remote Control active; if True, the load should NOT
be more than remote load limit setpoint.
• Warning activated; panel will display a warning
message that is further explained in the Messages
Section of this manual.
• Max. Load Limit; programmed valve position
limit.
Limiting Capacity by mixing Solution &
Refrigerant
Isoow chillers are equipped with provisions to accom-
modate low load operation (down 10%) with cooling
water temperature as low as 45°F (7.2°C). Achievement
of low capacity at low cooling water temperature requires
reduction of concentration in the solution circuit. Water
from the refrigerant circuit is added to the solution circuit
for dilution naturally by operating the unit at low load.
Further load reduction occurs by sending Lithium Bro-
mide under a controlled basis to the refrigerant circuit.
The amount of actual Lithium Bromide transferred is kept
to a minimum by introducing this Lithium Bromide only
when the refrigerant level in the refrigerant circuit is at a
minimum operational level.
The unloader valve (3SOL) is opened when the upper
refrigerant oat/level switch (1F) opens and the leav-
ing chilled water temperature is greater than 2°F above
setpoint. This temperature threshold prevents transfer of
solution during possible low refrigerant level at start-up
by blocking out the operation of 3SOL until the chilled
water temperature is within range of normal operation.
The refrigerant level solenoid (unloader control) 3SOL
Valve is energized (open) to transfer solution from the
solution (absorber on 50Hz models YIA-10E3 - YIA14F3
with Franklin Pumps) pump discharge to the refrigerant
pump suction when a low level of refrigerant would oth-
erwise cause refrigerant pump cavitation.

JOHNSON CONTROLS
14
FORM 155.21-O1 (615)
OptiView Control Center
Dilution Cycle Operation
A dilution cycle is performed every time the chiller is
cycled off or shutdown. The purpose of the dilution cycle
is to prevent the solution from crystallization while the
chiller is off by reducing the solution concentration.
The goal is to reduce the concentration down to 57°
(13.8°C) at which the crystallization temperature is
near 35° F (1.6°C). A dilution cycle will occur at most
unit shutdowns. A typical dilution cycle will operate the
refrigerant, solution, generator (Franklin pumps 10E3 –
14F3 only), condenser and chilled liquid pumps with the
control valve fully closed. When a dilution cycle is per-
formed, the evaporator continues generating vapor and
the absorber continues the mass transfer by absorbing the
vapor, but the rate produced in the generator is reduced
drastically because the control valve is closed.
The Mod “D”, YIA absorption chiller is capable of
performing four different dilution cycles:
1. Normal dilution
2. Manual dilution
3. Limited dilution
4. Short dilution
Normal Dilution Cycle – is performed when the short
dilution cycle is disabled and unit is under either leaving
chilled liquid temp (LCHLT) control or strong solution
concentration (SSC) control. The control valve will close
and all pumps; solution, refrigerant, generator (Franklin
pumps 10E3 – 14F3 units only), condenser and chilled
liquid will continue to run for 6 minutes. The normal
dilution cycle will terminate after the 6 minute interval is
complete. A normal dilution cycle is independent of the
solution concentration at the start of the dilution cycle.
A normal dilution cycle will initiate in all three control
panel access levels (View, Operator, or Service). The
following conditions will pre-maturely terminate the
normal dilution cycle.
During normal operation where at least medium load
prevails, Lithium Bromide in the refrigerant circuit is
NOT required. The YIA unit provides means for Lithium
Bromide removal from the refrigerant circuit as load is
increased.
During operation, the refrigerant temperature sensor
(RT8), which is continuously monitored and displayed,
provides several control functions. If the refrigerant
temperature falls to 35.5°F (1.9°C), the stabilizer refriger-
ant solenoid valve (2SOL) is energized (open) on units
equipped with Franklin pumps; if the unit is equipped with
Buffalo pumps, it will be energized only if the refrigerant
pump is running. This transfers refrigerant to the genera-
tor’s solution outlet line to reduce the concentration, thus
reducing the cooling capacity of the unit. This lessens the
possibility of crystallization. Simultaneously, unit loading
is inhibited to 50% valve position. If the temperature falls
to 34.0°F (1.1°C), the solution (absorber on 50 Hz Models
YIA-10E3 – YIA-14F3 with Franklin pumps) pump turns
off; this should allow the refrigerant temperature to rise.
If the refrigerant temperature rises to 35.5°F (1.9°C), the
solution pump turns on. If the refrigerant temperature
rises to 36.0°F (2.2°C), the stabilizer refrigerant solenoid
valve is de-energized (closed), and the unit loading inhibit
is removed.
However if the refrigerant temperature continues to fall,
a low refrigerant temperature safety shutdown occurs at
33.0°F (.5°C). If the unit experiences a shutdown when
the refrigerant temperature is 34°F (1.1°C) or below, the
chilled liquid pump contacts remain closed for a mini-
mum of 30 minutes. Subsequently, when the refrigerant
temperature rises to 37.0°F (2.8°C), the dilution cycle
begins.
The motor coolant solenoid valve (units with Franklin
pumps only) is energized (open) whenever the strong solu-
tion temperature is above 160°F (71.1°C) (this threshold
is programmable from 127°F to 160°F (52.8 to 71.1°C);
the threshold should only be programmed by a qualied
service technician.
The motor coolant solenoid valve is de-energized (closed)
whenever the strong solution temperature is below the
programmed open threshold minus 10°F. The purpose
of the valve is to prevent evaporation of water from the
coolant reservoir during unit shutdown or when the unit
operates at low load and low condensing water tempera-
tures. However, if the refrigerant and solution (absorber
and generator on 50 Hz Models YIA-10E3 – YIA-14F3
with Franklin pumps) pump motor coolant level oat
switch opens, the unit locks out on a safety shutdown.

FORM 155.21-O1 (615)
15
JOHNSON CONTROLS
2
Condition System Details
Display Message
Chilled liquid ow opens
greater than 2 seconds
Dilution cycle interrupted
– chilled water off
Condenser water flow
opens greater than 30
seconds
Dilution cycle interrupted
– Cond water off
Solution pump contacts
open
Solution pump
overloads open
Refrigerant pump
contacts open
Refrigerant pump
overloads open
34°F (1.1°C) less than
refrigerant temp less than
or equal to 35.5° (1.9°C)
Low refrigerant temp
RT8 is less than 35.5°F
(1.9°C)
33°F (.55°C) less than
refrigerant temp less than
34°F (1.1°C)
Low refrigerant temp RT8
is less than 34°F (1.1°C)
solution pump is off
Refrigerant temp less than
or equal to 33°F (0.56°C)
Low refrigerant temp
analog RT8 is less than
33°F (0.56°C)
Low refrigerant temp
safety device open
Low refrigerant temp
digital LRT opened
Strong solution temp
greater than 330°F
(166°C)
Generator Hi temp analog
switch RT3 is greater than
330°F (166°C)
Generator High temp
safety device open
Generator Hi temp digital
switch HT1 opened – Man
reset
3F opening = ref pump
shutdown delay setpoint
After 30 sec. delay, dilu-
tion cycle terminated –
switch 3F opened.
Motor coolant oat switch
is open for 0.5 sec. (units
with Franklin pumps
only)
Low motor coolant level -
MCFL switch opened
Generator shell pressure
is greater than or equal to
672mmHg (analog)
Generator Hi pressure
analog switch PT1 greater
than 672 mmHg
High pressure (digital)
safety device open
Generator Hi-Pressure
digital switch HP1 open
Auxiliary safety shutdown
contact is open
Auxiliary safety
shutdown
Remote/Local cycling
contact is open
Unit shutdown by remote
device
Multi-Unit cycling contact
is open
Unit shutdown by multi
-unit remote
Manual Dilution Cycle – is only available in the “Sys-
tems” screen when the panel is set to “Service” access
level. The manual dilution key will NOT show in the
“View” or “Operator” access level screens. When the
manual dilution key is pressed when the unit is not run-
ning (unit switch in stop position), a pop up box will
appear to conrm the start of the manual dilution cycle.
Press the “” key to conrm the dilution cycle and the
refrigerant, solution, generator (Franklin pumps 10E3
– 14F3 only), condenser and chilled liquid pumps will
operate for 6 minutes. To terminate the dilution cycle
press the manual dilution key again and conrm “Stop
dilution cycle (Yes/No)” by pressing the “” key in the
pop up box.
Condition System Details
Display Message
Chilled liquid ow opens is
greater than 2.0 seconds
Dilution cycle interrupted
– chilled water off
Condenser water flow
opens is greater than 30
seconds
Dilution cycle interrupted
– Cond water off
Solution pump contacts
open
Solution pump overloads
open
Refrigerant pump
contacts open
Refrigerant pump
overloads open
Refrigerant temp is less
than or equal to 33°F
(0.56°C)
Low ref temp analog
RT8 is less than 33°F
(0.56°C)
Low refrigerant temp
safety device open
Low ref temp digital LRT
opened
Generator High temp
safety device open
Gen hi-temp dig switch
HT1 opened – man reset
3F open = ref pump
shutdown delay setpoint
Dilution cycle interrupted
– switch 3F opened
Ref level switch
conict - CHK 1F & 3F
Motor coolant oat switch
is open for 0.5 sec. (units
with Franklin pumps
only)
Low motor coolant level -
MCFL switch opened
Generator shell pressure
is greater than or equal to
672mmHg (analog)
Generator Hi pressure
analog switch PT1 is
greater than 672 mmHg
High pressure (digital)
safety device open
Generator Hi Pressure
digital switch HP1 open
Auxiliary safety shutdown
contact is open
Auxiliary safety
shutdown
Remote/Local cycling
contact is open
Unit shutdown by remote
device
Multi-Unit cycling contact
is open
Unit shutdown by multi
unit remote

JOHNSON CONTROLS
16
FORM 155.21-O1 (615)
Limited Dilution Cycle – A limited dilution cycle was
created for power failure situations when the unit is
connected to a stand-by generator. A limited dilution
will only operate the solution pump or generator pump
(Franklin pump 10E3 – 14F3 units only) for a four hour
time period to conserve energy. It will not operate the
chilled liquid pump or condenser tower water pump
during this period. If the condenser ow switch closes,
(indicating ow) the limited dilution cycle will termi-
nate. If the chilled water pump ow switch closes, the
limited dilution cycle will continue. During a limited
dilution cycle, the unit will continue to monitor if the
fault condition has been cleared to switch to a normal
dilution cycle.
Short Dilution Cycle – The short dilution cycle option
must be enabled under the “Setpoints” screen in Service
access level. Upon unit shut down, the software logic
will monitor the strong solution temperature taken at
RT10 and compare this to the solution concentration
crystallization point. The duration period of the short
dilution cycle will be as follows:
Concentration
Pumps
operation
duration
2SOL opening
duration
Less than 57% 60 seconds N/A
57% - 59% 70 seconds 50 seconds
59% - 61% 110 seconds 90 seconds
61% - 63% 170 seconds 150 seconds
63% - 65% 200 seconds 180 seconds
Greater than 65% 230 seconds 210 seconds
Depending on the solution concentration, the 2SOL
(stabilizer) solenoid valve will open to allow refriger-
ant from the discharge side of the refrigerant pump to
mix with the solution returning from the generator to
accelerate the dilution process. This feature cannot be
enabled during a power failure. All pumps; solution,
refrigerant, generator (Franklin pumps 10E3 – 14F3
units only), condenser and chilled liquid will run during
a short dilution cycle.
Purge Process
The YIA OptiViewTM control handles 4 purge operation
modes, they are Auto, Manual, Maintenance, and Re-
pair. The chiller continually separates non-condensables
to the purge tank, regardless of mode. If these
non-condensables are NOT removed from the system
they will collect in the absorber section and blanket the
tubes. This blanketing will prevent the tubes from mak-
ing the necessary mass transfer of refrigerant from the
evaporator section, thus reducing the units capacity.
The mode determines how to clear the purge tank.
• Auto-purge mode enables the unit able to clear the
purge tank by itself and monitor its performance.
• Manual purge mode allows the operator to clear the
purge tank when necessary.
• Maintenance mode allows the operator to change
the purge pump oil.
Repair mode gives the service technician full freedom
for all purge device operation. It allows troubleshoot-
ing and also allows operation to purge directly from the
evaporator-absorber shell, which is helpful in the unit
start-up process.
To reduce the risk of injury, never oper-
ate the purge pump with the belt guard
removed!
Extreme caution must be taken when
performing a purge process. Never
allowing air to enter the unit at any
time.
The auto-purge system can start and
stop automatically; even when the unit
is NOT running.
Smart Purge
The smart purge system is a new addition to the YIA
chiller product line. Smart purge system features in-
clude:
• Purge warm-up setpoint. This setpoint will allow
the purge pump oil to warm-up before opening
8SOL. It can be programmed from 2 minutes to
20 minutes, default being 2 minutes. If the purge
pump was running within 50 minutes prior to an
additional start-up, the warm-up period will default
to 2 minutes.
• The YIA auto-purge trigger pressure will be
80mmHg Abs, it will evacuate the purge tank to
30mmHg Abs.
• Continuous monitoring of the purge pump perfor-
mance.
• Continuous monitoring of the purge tank pressure.
• Excess purge warning
OptiView Control Center

FORM 155.21-O1 (615)
17
JOHNSON CONTROLS
2
• Purge trending
• Post purge "Oil Clean-up"
The logic to control the YIA auto-purge is ONLY avail-
able on units equipped with an OptiView Control Panel.
Therefore there can be NO retrotting of an auto-purge
system on older units unless it is equipped with an
OptiView Control Panel.
Mode Control
Source
Min. Access
Level Req'd.
Auto Local/Remote View
Manual Local/Remote Operator
Repair Local/Remote Service
Maintenance Local/Remote Operator
The YIApurge system will collect any non-condensables
in the absorber section and store them in a unit mounted
purge tank. At a predetermined purge tank pressure, the
non-condensables will be expelled to the atmosphere by
a unit mounted purge pump. The YIA auto-purge will
also monitor, record and trend the amount of purges in
any given time.
Manual Purge
It may be necessary to manually purge the unit mounted
purge tank. The manual mode allows the operator to
perform this function. The manual purge can be per-
formed from the OptiView control panel independent
of unit operation. The pump can be turned on in either
the Operator or Service modes.
Before initiating a manual purge, VP2
must be opened and VP4 closed.
From the HOME screen select the PURGE key to
navigate to the Purge Screen. Select MAN/AUTO so the
purge eld box displays "MANUAL". Press the "ON"
key and the purge pump will operate for 2 to 20 minutes
depending on the duration of the Purge Warm-up setpoint
(default is 2 minutes). If the purge pump was operated
in the past 50 minutes, the purge warm-up will be 2
minutes. Purge pump solenoid valve (8SOL) and purge
tank solenoid valve (7SOL) will be closed at this time.
After the pre-programmed purge warm-up period has
timed out the purge pump solenoid valve (8SOL) will
begin to open and a 1 minute timer will initiate.After the
1 minute timeout, the pressure at purge pump pressure
transducer (PT3) must be equal to or less than 15mm
Hg Abs. If not, the purge pump will continue to run for
an additional minute. If during this additional minute,
the pressure at PT3 reaches 15mm Hg Abs or less, purge
tank solenoid (7SOL) will open. If not, purge pump
solenoid valve (8SOL) will close and the purge pump
continues to run for 65 seconds. This allows time for
purge pump solenoid valve (8SOL) to fully close. The
panel will display a warning message that is further
explained in the Messages Section of this manual.
During the 65 second pump shut-off
delay, manual turn OFF of the purge
pump is prevented.
If at anytime during the manual purge process, the purge
pump pressure at PT3 or purge tank pressure (PT4)
reaches 100mm Hg Abs or higher, both the purge pump
solenoid valve (8SOL) and purge tank solenoid valve
(7SOL) will close. The purge pump will run for another
65 seconds then shutdown and the panel will display a
warning message that is further explained in the Mes-
sages Section of this manual.
Once purge tank solenoid valve (7SOL) is opened,
non-condensables stored in the Purge Tank will be
expelled to the Atmosphere by the Purge Pump. The
OptiView logic monitors this process and if a decrease
in pressure at the Purge Tank (PT4) is NOT seen every
6 seconds, the panel will initiate a purge failure.
A warning message will be displayed (further explained
in the Message Section of this manual) and both Purge
Tank Solenoid Valve (7SOL) and the Purge Pump
Motorized Ball Valve (8SOL) will close and the Purge
Pump will run for an additional 65 seconds before shut-
ting off.
The Manual Purge will continue until Purge Tank Trans-
ducer (PT4) reads 20mmHg Abs. At that time the manual
purge will initiate a normal shutdown by closing Purge
Tank Solenoid (7SOL) and Purge Pump motorized Ball
Valve (8SOL). The Purge Pump will continue to operate
for a post purge oil clean-up for 10 minutes.
After the manual purging is nished, press the "PURGE
PUMP" key to activate purge pump eld then press
the "OFF" key to shut off the pump. The pump will
continue to run for an additional 10 minutes for a post
purge clean-up.

JOHNSON CONTROLS
18
FORM 155.21-O1 (615)
OptiView Control Center
When the post purge cleaning process nishes, the
purge pump is turned off and the last 7 days manual
purge counter and the total manual purge counter is
increased by 1.
The manual purge can be stopped by the user at any
moment, but the manual purge counters will NOT be
increased if the (7SOL) (8SOL) valves are still closed.
When the manual purge is manually stopped, the control
will close (7SOL) and (8SOL) and run the pump for 65
seconds.
Auto Purge
When the unit mounted purge tank pressure transducer,
PT4 reaches 80mm Hg Abs, the auto purge sequence
is triggered. The purge pump will start and run for the
pre-programmed purge warm-up period. If no pre-
programmed time period has been entered the default
will be 2 minutes. If the purge pump was operated in
the past 50 minutes prior to the auto purge sequence,
the “Purge warm-up period” will be 2 minutes. After the
purge pump warm-up setpoint time has expired, purge
pump solenoid (8SOL) will start to open and a 1 minute
timer will initiate.
After 1 minute the pressure at purge pump pressure
transducer (PT3) is read. If this pressure is 15 mm Hg
Abs or less, purge tank solenoid (7SOL) will open. If
not, the purge pump will continue to run for an additional
minute. If during this additional minute, the pressure at
PT3 reaches 15 mm Hg Abs or less, purge tank solenoid
(7SOL) will open. If not, purge pump solenoid valve
(8SOL) will close and the purge pump continues to run
for 65 seconds. Please note during the 65 second pump
shut-off delay, manual turnoff of the purge pump is
prevented. This allows time for purge pump solenoid
valve (8SOL) to fully close. The panel will display a
warning message that is further explained in the Mes-
sages Section of this manual.
Once purge tank solenoid (7SOL) is opened,
non-condensables stored in the purge tank will be
expelled to the Atmosphere via the purge pump. The
OptiView logic monitors this process and if a decrease
in pressure at the purge tank (PT4) is NOT seen every
6 seconds, the panel will initiate a purge failure.
A warning message will be displayed (further explained
in the Messages Section of this manual) and both Purge
Tank Solenoid Valve (7SOL) and Purge Pump Motorized
Ball Valve (8SOL) will close and purge pump will run
for another 65 seconds before shutting off.
Once the purge tank pressure transducer (PT4) reads 30
mm Hg Abs, both 7SOL and 8SOL will close. The purge
pump will continue to run for another 10 minutes for a
post purge oil clean-up then shut off.
When the post purge cleaning process nishes, the last
7 day auto purge counter and total auto purge counter
will increase by 1.
If at anytime during the manual purge process, the purge
pump pressure at PT3 or purge tank pressure (PT4)
reaches 100 mm Hg Abs or higher, both the purge pump
solenoid valve (8SOL) and purge pump solenoid valve
(7SOL) will close. The purge pump will run for another
65 seconds then shut down and the panel will display a
warning message that is further explained in the Mes-
sages Section of this manual.
Maintenance Purge
The maintenance purge mode is intended exclusively for
the unit operator to periodically change the purge pump
oil. Periodic oil changes are necessary to maintain ef-
cient operation of the system. The purge pump should
always be operated with the gas ballast open to prevent
refrigerant vapor from condensing in the oil.
An indication of when the oil in the purge pump needs
changed is when the oil in the sight glass becomes yel-
lowish or milky in color. A purge pump capacity test
may also be an indicator, but this is not recommended
for the operator to perform.
It is recommended to warm-up the purge pump oil for
a minimum of 10 minutes to reduce the viscosity of the
oil prior to draining.
Enter the "Operator" access level by entering the op-
erator code "9675" and proceed to the "Purge Screen".
Pressing the "Maintenance" key at the bottom of the
screen will change the purge mode to "Maint" and will
allow the pump to be started manually. The 8SOL and
7SOL valves will not open while the pump continues
to run.
Once the pump is started in this man-
ner the pump will continue to run until
it is manually shut off. Before proceed-
ing to any other purge mode, ensure
the purge pump is not running.

FORM 155.21-O1 (615)
19
JOHNSON CONTROLS
2
Purge Mode Changes
When the purge mode is changed, 7SOL and 8SOL are
closed. If NOT closed the purge pump will continue to
run an additional 65 seconds, if it was running.
If the purge mode is changed to "REPAIR", it is possible
to purge either the purge tank or the evaporator-absorber
shell. Another option could be to test the purge line for
any leaks and verify pump performance without purg-
ing the unit.
• Purging the purge tank: open VP2, close VP4.
• Purging the shell: Close VP2 and open VP4 (VP2 could
be open if it desired to make a faster vacuum).
• Testing the purge line or the purge devices; Close
VP2, and VP4.
Auto-Decrystallization Process
The auto-decrystallization process is triggered when the
ADC pipe temperature sensed by RT2 is greater than
160°F (71°C) and 3F oat/level switch is closed (enough
refrigerant level exists for the refrigerant pump). The
auto-decrystallization line provides an alternate path
for the strong solution from the generator.
If a situation starts to develop such that solution concen-
tration from the generator is excessively high, solution
crystals will start to build on the shell side of the heat
exchanger. This will restrict the ow through the nor-
mal line of solution return from the generator, then the
solution level will increase in the overow box until it
reaches the auto-decrystallization line.
• This process sets the control valve opening to 50%
to decrease the concentration in the solution.
• Open Stabilizer Valve (2SOL) valve 2 minutes every
10 minutes.
• 3F oat switch is closed (enough refrigerant level
exists for the refrigerant pump).
• If 3F level switch opens, stops the auto-decrystal-
lization process and starts the limited auto-decrstal-
lization process.
• Reviews the temperature at RT2 every 10 minutes,
if it is less than 150°F (65°C), the control assumes
that the unit has been decrystallized and returns to
running mode.
• During a soft shutdown, if the unit were to go into
an ADC mode, and the unit control valve is greater
than 50% open, the valve will be immediately be
driven to the 50% position. The soft shutdown will
continue from the 50% position. The unit will go
into a mandatory 6 minute dilution cycle if shutdown
during ADC.
Limited Auto-decrystallization
The limited auto-decrystallization process is triggered
when the temperature sensed by RT2 is greater than
160°F (71°C), and 3F oat switch is open (insufcient
refrigerant level for the refrigerant pump).
• This process sets the valve opening to 50% to de-
crease the concentration in the solution.
• Monitors 3F and 1F level switches, if both level
switches are closed, stops the limited decrytalliza-
tion process and starts the normal auto-decrytalli-
zation process.
• This process lasts until the 10 minute ADC timer that
was running when Limited Auto-decrystalization
started has completed.
Secondary Limited Auto-decrystallization
The secondary limited auto-decrystallization process is
called by the limited auto-decrystallization process when
it nishes and the temperature sensed by RT2 is greater
than 150°F (65.5°C), and the 3F level switch is open.
• This process closes the control valve, because the
machine is NOT capable of adding refrigerant to
the solution via 2SOL.
• Monitors 3F and 1F level switches, if both level
switches are closed, stops the secondary limited
auto-decrystallization process and starts the auto-
decrystallization process.
• This process last 15 minutes. If the temperature
sensed by RT2 is less than 150°F, the control as-
sumes that the unit has been decrystallized and
returns to running mode, if NOT, the control sets
the machine in safety shutdown.
UNIT OPERATION UNDER POWER FAILURE CON-
DITION USING AN EMERGENCY POWER SUPPLY
When the chiller has an emergency power supply, this
feature helps prevent crystallization if there is a power
failure. This feature manages the unit in three states:
• The unit is already diluted
• The unit is NOT diluted and it is possible to perform
a limited dilution cycle
• The unit is NOT diluted and it is NOT possible to
perform a limited dilution cycle because there was
a safety shutdown that does NOT allow the starting
of the solution pump.
All pumps are turned OFF and all valves are closed,
the control does NOT allow any manual operation of
the machine and waits until the unit has normal power
supply. After that, the unit is ready to start.

JOHNSON CONTROLS
20
FORM 155.21-O1 (615)
OPTIVIEW CONTROL CENTER
The OptiView™ Control Center display is highlighted
by a full screen graphics display. This display is nested
within a standard keypad, and is surrounded by “soft”
keys which are redened based on the currently dis-
played screen. Eight buttons are available on the right
side of the panel, and are primarily used for navigation
between the system screens. At the base of the display
are 5 additional buttons. The area to the right of the key-
pad is used for data entry with a standard numeric keypad
provided for entry of system setpoints and limits.
The Decimal key provides accurate entry of
setpoint values.
A +/- key has also been provided to allow entry
of negative values and AM/PM selection during
time entry.
In order to accept changes made to the chiller
setpoints, the Check key is provided as a uni-
versal "Enter" or "Accept’’ symbol.
In order to reject entry of a setpoint or dismiss
an entry form, the X key is provided as a uni-
versal "Cancel" symbol.
Cursor Arrow keys are pro-
vided to allow movement on
screens which contain a large
amount of entry data. In ad-
dition, these keys can be used
to scroll through history and
event logs.
The Start/Stop control is operated via a three-position
rocker/rotary switch. When toggled all the way to the
right, it is considered in the STOP/RESET position.
When in the middle position, this is considered the
RUN state. When toggled to the left-most position, it is
considered in the START state. Each state is described
in detail below:
•STOP / RESET (O)
When in this position, the chiller will not run under
any condition. For safety reasons, this position is
required for many maintenance tasks to be com-
pleted. In addition, the switch must be placed in this
state following a Safety shutdown before the chiller
is allowed to restart. This guarantees that manual
intervention has taken place and the shutdown has
been acknowledged.
 • START(◄)
The switch can only remain in this position when
being acted upon by a manual force. Once the user
has released the switch, it automatically reverts to
the RUN position. Generally, this state only occurs
momentarily as the operator attempts to locally start
the unit. Once this position has been sensed, if all
fault conditions are cleared, the unit will enter the
system start sequence.
•RUN (▀)
When in this position, the chiller is able to operate.
The switch spring-returns to this state after it has
been toggled to the START position. When in this
state, the chiller is allowed to function normally, and
will also allow the chiller to automatically restart fol-
lowing a Cycling shutdown. The switch must be in
this state to receive a valid remote start signal when
operating under a remote control source.
29348A
FIGURE 3 - OPTIVIEW CONTROL CENTER
OptiView Control Center