| Вид документа | Інструкція |
|---|---|
| Виробник | JCI |
| Моделі | YLAA0189SE-YLAA0485SE, YLAA0195HE-YLAA0515HE, YLAE0195SE-YLAE0490SE, YLAE0195HE-YLAE0510HE, YLAE0195LT-YLAE0490LT, YCWL0240SE-YCWL0395SE, YCWL0200HE-YCWL0610HE, YCRL0200HE-YCRL0610HE |
| Група обладнання | other |
| Мова документа | англійська |
| Розмір файлу | 1.2 МБ |
Про документ
Operating instruction for YORK Tempo & Zafiro air-cooled (YLAA, YLAE) and water-cooled (YCWL/YCRL) liquid chillers using R410A, controlled by a microprocessor-based system with IPUII controller (software C.MMC.16.03 and higher). SE = standard efficiency, HE = high efficiency, LT = low temperature. The manual covers control panel operation, capacity control, setpoints, options, BAS/EMS reset signals, ISN/BACnet/Modbus communications, and the optional heatpump mode.
Ключові дані
| Refrigerant | R410A |
|---|---|
| Software | C.MMC.16.03 and higher |
| Chilled liquid SETPOINT (water) | 4.4°C to 21.1°C (default 6.7°C) |
| Chilled liquid SETPOINT (glycol) | -7.2°C to 21.1°C (default 6.7°C) |
| Chilled liquid SETPOINT (low temp glycol) | -13.3°C to 21.1°C (default 6.7°C) |
| Leaving liquid RANGE | +/-0.8°C to +/-1.4°C (default +/-1.1°C) |
| Discharge pressure cutout range | 22.4 barg to 39.6 barg |
| Suction pressure cutout (water) | 5.52 barg to 8.27 barg |
| Anti-recycle timer | 240 s to 600 s |
Застосування
- Independent operation or integration via ISN (YorkTalk), BACnet or Modbus building management systems
- Chilled liquid temperature maintenance for water or glycol circuits (low temperature glycol down to -13°C setpoint)
- Optional heatpump mode (YCWL) for heating duty with hot leaving liquid control
Особливості
- Dual refrigerant circuit (system 1/system 2) control with automatic or manual lead/lag rotation
- Daily/holiday scheduling with internal real-time clock (battery-backed RTC)
- Remote start/stop, load limiting (stage 1/stage 2), and chilled liquid temperature reset via voltage-free contacts
- EMS-PWM remote setpoint reset by timed contact closure
- Analog temperature reset inputs: 0-10 Vdc, 2-10 Vdc, 0-20 mA, 4-20 mA
- Anti-recycle and anti-coincidence timers; pumpdown on shutdown; crankcase heaters
- Condenser fan staging controlled from discharge pressure; two-speed fan option with star/delta dwell timing; fan full speed inhibit
- Low ambient kit with variable-speed fan and evaporator solenoid valve
- Optional Hydro Kit with single or dual (duty/standby) pumps
- Optional soft start on last compressor of each system
- Fault history buffers (last 6 safety shutdowns), optional serial printer (RS-232)
- Display in SI or Imperial units, multiple display languages
Технічні дані
| Parameter | Value |
|---|---|
| Refrigerant | R410A |
| Control software version | C.MMC.16.03 and higher |
| Keypad/display | Touch keypad + 40-character LCD (2 lines x 20 chars), lighted background |
| Leaving Liquid 'SETPOINT', Water Cooling | 4.4°C to 21.1°C (default 6.7°C) |
| Leaving Liquid 'SETPOINT', Glycol Cooling | -7.2°C to 21.1°C (default 6.7°C) |
| Leaving Liquid 'SETPOINT', Low Temp Glycol | -13.3°C to 21.1°C (default 6.7°C) |
| Leaving Liquid 'RANGE' | 0.8°C to 1.4°C (default 1.1°C) |
| Max EMS-PWM Remote Temperature Reset | 1.0°C to 22.0°C (default 11.0°C) |
| Discharge Pressure Cutout | 22.4 barg – 39.6 barg (default 38.6 barg; factory YLAA/YLAE 33.8 barg, YCWL 38.0 barg) |
| Suction Pressure Cutout, Water Cooling | 5.52 barg – 8.27 barg (default 6.00 barg; factory YLAE 5.52 barg, YCWL 5.59 barg) |
| Suction Pressure Cutout, Glycol Cooling | 2.90 barg – 8.27 barg (default 6.00 barg) |
| Low Ambient Temperature Cut-out | -17.8°C to 15.6°C (default -3.9°C) |
| Leaving Chilled Liquid Temperature Cut-out | Water 3.0°C fixed; Glycol -13.1°C to 3.0°C; LT Glycol -18.3°C to 3.0°C |
| Anti-Recycle Timer | 240 s – 600 s (default/factory 600 s); stop-to-start fixed at 90 s (120 s on power-up) |
| Fan Control On-Pressure (YLAA/YLAE) | 20.0 barg – 33.4 barg (default 23.0 barg) |
| Fan Differential Off-Pressure (YLAA/YLAE) | 3.7 barg – 11.0 barg (default 5.5 barg) |
| Rate Sensitivity | 1.0°C/min – 8.0°C/min (default 1.7°C/min) |
| Rate Control Temperature | 1.0°C – 11.0°C (default 6.1°C) |
| Mechanical HP switch trip, YLAA | 38.7 barg |
| Mechanical HP switch trip, YLAE | first switch 38.7 barg; second (models 0255SE/0265HE+) 40.3 barg |
| Mechanical HP switch trip, YCWL/YCRL | first 34.7 barg; second 36.3 barg |
| Compressor overload protection | EN60947-4-1 tripping category class 10 A |
| Motor protector (-FMP) trip resistance | 4.5 kW ± 20% trip, reset < 2.75 kW; 30 ± 5 min module reset delay |
| Voltage-free contact rating (run status/alarm) | 125 VA (external circuit up to 254 Vac or 28 Vdc) |
| Remote start/stop terminals | 13 & 14 (-ARB board, YLAA/YLAE) / 13 & 51 (-XTBC1, YCWL/YCRL) |
| Flow switch requirement | rated 30 Vdc, 1–3 mA, gold contacts recommended |
| Analog input types (remote temp reset) | 0–10 Vdc, 2–10 Vdc, 0–20 mA, 4–20 mA (jumper selectable 20 mA or 10 Vdc) |
| I/O board supply | +12 Vdc relay coils; unregulated +30 Vdc digital inputs; +5 V sensors |
| Printer port | RS-232 (TB3), baud rate 1200, parity none, 8 data bits |
| BACnet/Modbus ports | Port P1 (RS485 TB1), Port P2 (RS485 TB2, HW select bit set to RS-485); baud rates 1200–76800; MAC address 0–127 |
| Heating setpoint (YCWL heatpump) | 30°C – 52°C |
| Heating RANGE (YCWL heatpump) | 0.5°C – 5°C |
| Soft starter ramp time | acceleration to full speed within 0.8 s |
| Variable speed fan pressure band (low ambient) | maintains discharge pressure between 18 and 22.5 barg |
Варіанти замовлення
- Efficiency variants: SE — Standard Efficiency, HE — High Efficiency, LT — Low Temperature
- Options referenced: Hydro Kit (single or dual pump), soft start, low ambient kit, printer kit YORK part numbers 362L11330-002 (UK) / 362L11330-003 (EUROPE), spare paper roll 025L01992-000, spare ink ribbon 025L01993-000
- Control board terminal designations printed: AMB-XTB7-8/-9/-10, AMB-XTB10-8/-9/-10, AMB-XTB8-5/-8 (fan output relays)
Допуски та стандарти
- EN60947-4-1 (compressor overload tripping category class 10 A)
Текст документа
Библиотека СОК
YLAA0189SE-YLAA0485SE YLAA0195HE-YLAA0515HE
YLAE0195SE-YLAE0490SE YLAE0195HE-YLAA0510HE YLAE0195LT-YLAE0490LT
YCWL0240SE - YCWL0395SE YCWL/YCRL0200HE - YCWL/YCRL0610HE
OPERATING INSTRUCTION Revision 1 Form 201.26.OI1(11/09)
(035-21976-110)
AIR & WATER COOLED LIQUID CHILLERS
MICRO BASED CONTROL SYSTEM WITH IPUII
SOFTWARE VERSION C.MMC.16.03 AND HIGHER
SE - STANDARD EFFICIENCY, HE - HIGH EFFICIENCY
LT - LOW TEMPERATURE
Tempo & Zafiro
R410A
Form 201.26.OI1(11/09)
TABLE OF CONTENTS
1 GENERAL 6 ENTRY KEYS
1.1 Control Panel 1.1 6.1 UP ARROW and DOWN ARROW Keys 1.26
1.1.1 AMB (IPU II and I/O Boards) 1.1 6.2 ENTER/ADV Key 1.26
1.1.2 Internal Clock & Memory Backup Battery 1.1
7 SETPOINTS KEYS
1.1.3 Keypad and Display 1.2
1.1.4 Unit (Chiller) ON/OFF Switch 1.2 7.1 Cooling Setpoints 1.26
1.1.5 Customer Controls 1.2 7.2 SCHEDULE/ADVANCE DAY Key 1.27
1.1.6 Remote Start/Stop 1.2 7.3 PROGRAM Key 1.28
1.1.7 Flow Switch 1.2 7.4 Setpoint and Cut-out Settings 1.30
1.1.8 EMS PWM Remote Setpoint Reset 1.2
1.1.9 Load Limiting 1.4
8 UNIT KEYS
1.1.10 Fan Full Speed Inhibit (110 V circuit) 8.1 OPTIONS Key 1.31
YLAE Units with Dual Speed Fans only 1.4
8.2 CLOCK Key 1.33
1.1.11 Fan Full Speed Inhibit (30VDC Circuit)
YLAA Units with Dual Speed Fans only 1.4 9 OPTIONAL SOFT START
1.1.12 Chilled Liquid Pump Control 1.4
9.1 Diagnostics 1.34
1.1.13 Alarms 1.4
1.1.14 System Run Status 1.4 10 INPUTS / OUTPUTS
2 Operation 10.1 Digital Inputs 1.35
10.2 Analogue Inputs 1.35
2.1 Capacity Control 1.5
10.3 Digital Outputs 1.36
2.2 Anti-Recycle Timer 1.7
10.4 Analogue Output 1.36
2.3 Anti-Coincidence Timer 1.7
2.4 Compressor Crankcase Heater 1.7 11 OPTIONAL PRINTER INSTALLATION
2.5 Pumpdown (YLLSV) Control 1.7 11.1 Installation Limitations 1.37
2.6 Evaporator Solenoid Valve (YESV) Control . 1.7 11.2 Parts 1.37
2.6.1 YLAA Low Ambient Unit 1.7 11.3 Assembly and Wiring 1.37
2.7 Lead/Lag Control 1.8 11.4 Using Other Printers 1.37
2.8 Condenser Coil Fan Control 1.8 11.5 Warranty 1.37
2.8.1 Single speed fans 1.11 11.6 Obtaining a Printout 1.37
2.8.2 YLAA and YLAE 2 Speed Fan Option 1.12
2.8.3 Fan Star/Delta Dwell Time 1.13 12 BAS/EMS TEMPERATURE RESET USING A
VOLTAGE OR CURRENT SIGNAL
3 Control Panel Keys
12.1 0-10 Vdc Remote Signal 1.38
4 Status Key 12.2 2-10 Vdc Remote Signal 1.38
4.1 General Status Messages 1.15 12.3 0-20 mA Remote Signal 1.38
4.2 Fault Status Messages 1.17 12.4 4-20 mA Remote Signal 1.38
12.5 EMS-PWM Remote Temperature Reset 1.39
5 Display/Print Keys
13 ISN CONTROL
5.1 OPER DATA Key 1.19
(York Talk -AMB Terminal Block TB1)
5.2 PRINT Key 1.22
13.1 Received Data (Control Data) 1.39
5.3 History Key 1.24
13.2 Transmitted Data 1.40
5.3.1 Clearing History Buffers 1.24
5.3.2 History Messages 1.24
5.3.3 Software Version 1.25
I-i
Form 201.26.OI1(11/09)
14 BACnet and Modbus
(-AMB Board Terminal Block TB1)
14.1 BACnet and Modbus Data Communication 1.41
15 HEATPUMP OPTION
15.1 Heatpump Mode Selection 1.45
15.2 OPER DATA Key 1.45
15.3 SETPOINTS Key 1.45
15.4 Leaving Liquid Temperature Control 1.45
15.5 BAS/EMS Temperature Reset - Voltage /
Current Signal 1.46
15.5.1 0-10 Vdc Remote Signal 1.46
15.5.2 2-10 Vdc Remote Signal 1.46
15.5.3 0-20 mA Remote Signal 1.46
15.5.4 4-20 mA Remote Signal 1.47
15.6 EMS-PWM Remote Temperature Reset 1.47
I-ii
Form 201.26.OI1(11/09)
1 GENERAL From this information, the IPU II then issues commands
to the I/O board relay outputs to control contactors,
The units are designed to work independently, or in solenoids, etc. for Leaving Liquid Temperature Control
conjunction with other equipment via ISN, Bacnet or and to react to safety conditions. The I/O board converts
Modbus building management systems or other logic signals to operate relay outputs to 115 VAC levels
automated control systems. When operating, the unit used by motor contactors, solenoid valves, etc. to
controls monitor the chilled liquid system temperatures control system operation. The low voltage side of all
at the unit and take the appropriate action to maintain relay coils on the I/O board are powered by +12V.
the temperatures within desired limits. This action will
involve running one or more compressors to match the Keypad commands are actuated upon by the
cooling effect of the refrigerating systems to the heat microprocessor to change setpoints, cutouts,
load on the liquid system. The heat removed from the scheduling, operating requirements, and to provide
chilled liquid is then rejected to the air or water cooled displays. The keypad and display are connected to the
condenser. I/O board.
1.1 Control Panel The on-board power supply converts 24 Vac from T1
(120/24 VAC transformer), to +12 Vdc, +5 Vdc and +3.3
A microprocessor based control system is fitted to the Vdc using switching and linear voltage regulators
units. It is capable of dual refrigerant system (circuit) located on the I/O and IPU II boards. These voltages are
control to maintain chilled liquid temperature within used to operate integrated circuitry on the board. The
programmed limits, as well as sequencing, system power supply for the 40 Character Display and unit
safeties, displaying status, and daily schedules. sensors (transducers and temperature sensors) is also
derived from the +5 V. supply. The 24 Vac is also
Remote cycling, demand limiting and chilled liquid rectified, but not regulated, to provide unregulated +30
temperature reset can be accomplished by field Vdc to supply all of the digital inputs.
supplied contacts.
The IPU II board contains one green 'Power' LED to
Compressor starting/stopping and loading/unloading indicate that the board is powered up and one red
decisions are performed by the microprocessor to 'Status' LED (flashing) to indicate that the processor is
maintain leaving liquid temperature. These decisions operating.
are a function of temperature deviation from
‘SETPOINT’. The I/O board contains one green 'Power' LED to
indicate that the board is powered up and one red
A master (UNIT) ON/OFF switch is provided on the 'Status' LED (flashing) to indicate that the processor is
chiller control panel to activate or deactivate the operating. The I/O board also contains two sets of
complete chiller. Receiver/Transmit LED’s, one for each available serial
communication port. The receive LED’s are green, and
On YLAA and YLAE units with the optional Hydro kit the the Transmit LED’s are red.
control of the single or duty/standby pumps are integral
to the control system. A jumper on the I/O board selects 20 mA or 10 Vdc as
the input type on the remote temperature reset analog
1.1.1 AMB (IPU II and I/O Boards) input.
The IPU and I/O boards are assembled to function as a 1.1.2 Internal Clock & Memory Backup Battery
single microprocessor controller. The IPU II board
contains a 'Coldfire' microprocessor and is the controller The AMB board contains a real time clock (RTC)
and decision maker in the control panel. The I/O board integrated circuit chip with an internal battery backup.
handles all of the unit I/O (Inputs and Outputs). System The battery backup assures that any programmed
inputs from pressure transducers and temperature values (setpoints, clock, cut-outs, etc.) are not lost
sensors are connected to the I/O board. during a power failure or shutdown period regardless of
the time involved.
The I/O board contains a processor capable of reading
the inputs and controlling the outputs. It communicates
through the transition header with the IPU II
microprocessor. The I/O board circuitry multiplexes the
analog inputs, digitizes them, and constantly scans
them to keep watch on the unit operating conditions.
The input values are transmitted serially to the IPU II
microprocessor board.
1-1
Form 201.26.OI1(11/09)
1.1.3 Keypad and Display SYSTEM INPUTS
User interface is via a touch keypad and a liquid crystal Wiring from remote voltage free contacts
display allowing access to operating and programmed should be run in screened cable earthed at the
data. Information can be displayed in S.I. (Metric) or panel end only. If an inductive device (relay,
Imperial units. The 40 character liquid crystal display (2 contactor) is supplying these contacts, the coil
lines of 20 characters) is used for displaying system of the device must be suppressed with a
parameters and operator messages. The display has a standard RC suppresser across the inductive
lighted background for night viewing as well as a special coil.
feature which intensifies the display for viewing in direct
sunlight. 1.1.6 Remote Start/Stop
1.1.4 Unit (Chiller) ON/OFF Switch Remote start/stop can be accomplished using a time
clock, manual contact or other voltage free contact
The unit ON/OFF switch is located just below the connected to terminals 13 and 14 (-ARB circuit board on
keypad. This switch allows the operator to turn the entire YLAA and YLAE units) or 13 and 51 (-XTBC1 on
chiller OFF, if desired. The switch must be placed in the YCWL/YCRL units). The contact must be closed to
ON position for the chiller to operate. Any time the switch allow the chiller to run. Any time the contact opens for
is in the OFF position, a STATUS message will be more than 3 seconds, the chiller will shutdown and the
displayed. 'REMOTE STOP NO RUN PERM' message will be
displayed.
1.1.5 Customer Controls
1.1.7 Flow Switch (YCWL/YCRL and YLAA / YLAE
The microprocessor based control system can accept units without the hydro kit option)
remote signals to start and stop the chiller, to adjust the
leaving liquid temperature setpoint and to load limit the The customer must install and wire a field mounted flow
unit. To reduce unit noise on YLAA and YLAE units with switch. The flow switch should be rated for 30 Vdc 1 to 3
the 2 speed fan option, a customer voltage free contact ma, gold contacts recommended, connected to
can be connected to inhibit fan full speed .These terminals 13 and 18 (-ARB circuit board on YLAA and
functions can easily be controlled by connecting user YLAE units) and 13 and 14 (-XTBC1 on YCWL/YCRL
supplied voltage free contacts to the customer terminals units) to provide adequate protection against loss of
in the electronics section of the control panel. liquid flow.
In addition, run status and alarm contacts are provided The flow switch should never be by-passed.
to remotely signal system status and faults. This will cause damage to the chiller and
invalidate the warranty.
The optional Hydro Kit is fitted with a flow switch.
1.1.8 EMS PWM Remote Setpoint Reset
(Activated on request)
The leaving liquid temperature setpoint programmed
into the microprocessor can be remotely adjusted to a
higher value using repeated timed closure of voltage
free contacts 13 and 20 (-ARB circuit board on YLAA
and YLAE units) and 13 and 20 (-XTBC1 on
YCWL/YCRL units). The duration of the contact closure
will decide the amount of adjustment.
For noise immunity, the microprocessor will ignore
closures of less than 1 second.
1-2
Form 201.26.OI1(11/09)
-XTBC2 -F1
-XTBC1 -ARB -ARB
A- A+ 25 26 29 30 23 24 27 28 31 32 14 16 13 18 13 13 21 20 13
LK
SCREEN
CHILLER RUN STATUS SYSTEM 1 LIQUID PUMP START CONTACTS CHILLER RUN STATUS SYSTEM 2
SYSTEM 1 ALARM STATUS SYSTEM 2 ALARM STATUS
L 5 ANALOGUE
TEMPERATURE FSI
RESET SIGNAL RU PWM
FAN
RP
2nd STAGE LOAD LIMIT
1st STAGE LOAD LIMIT
SPEED
INHIBIT
REMOTE
START/STOP
or PWM INPUT
FLOW
SWITCH
REMOTE EMERGENCY
STOP DEVICE
YLAA Customer Controls
-F4 -F1 -XTBC1 -ARB -ARB
A- A+ 33 34 25 26 29 30 23 24 27 28 31 32 14 16 13 18 13 13 21 20 13
SCREEN
LK
FLOW
CHILLER RUN STATUS SYSTEM 1 LIQUID PUMP START CONTACTS CHILLER RUN STATUS SYSTEM 2
SYSTEM 1 ALARM STATUS SYSTEM 2 ALARM STATUS
FAN SPEED INHIBIT
ANALOGUE SWITCH
3 4 TEMPERATURE
RESET SIGNAL RU PWM
2nd STAGE LOAD LIMIT
1st STAGE LOAD LIMIT
RP
REMOTE
START/STOP
or PWM INPUT
REMOTE EMERGENCY
STOP DEVICE
YLAE Customer Controls
1-3
Form 201.26.OI1(11/09)
1.1.9 Load Limiting VOLTAGE FREE CONTACTS
Load Limiting prevents the unit from loading beyond a A 28 Vdc or up to 254 Vac external circuit (supplied by
desired value. 4 compressor units can be load limited to others) may be connected to these contacts. The
50% of the compressors by allowing only 1 compressor contacts are rated at 125 VA.
per system to run. 5 compressor units can be load
limited to 40% or 80% of the compressors. The 80% If any inductive load device (relay or
would allows a up 2 compressors per system to run and contactor) is connected to these contacts, the
the 40% limit would allow up to 1 compressor per system device must be suppressed at the load with a
to run. 6 compressor units can be load limited to 33% or RC suppressor across the inductive coil.
66% of the compressors. The 66% limit would allow up Failure to install suppressors will result in
to 2 compressors per system to run, and the 33% limit nuisance faults and possible damage to the
would allow up to 1 compressor per system to run. No unit.
other values of limiting are available.
1.1.12 Chilled Liquid Pump Control
The unit can be load limited through remote (YCWL/YCRL and YLAA / YLAE units without
communication via an ISN, Bacnet or Modbus, or the hydro kit option)
through closing contacts connected to the Load Limit
terminals 13 and 21 and PWM inputs terminals 13-20. Terminals 23 and 24 (-ARB circuit board on YLAA and
(-ARB circuit board on YLAA and YLAE units, -XTBC1 YLAE units) and 23 and 24 (-XTBC1 on YCWL/YCRL
on YCWL/YCRL units). Stage 1 of load limiting involves units) close to start the liquid pump. After the "30 second
closing the Load Limit input. Stage 2 of load limiting stop to start timer" has timed out, this contact is closed if
involves closing both the Load Limit and PWM inputs. there is a 'Leaving Liquid Temperature Cutout', any of
The first stage of limiting is either 50% of unit on 4 the compressors are running, or, the daily schedule is
compressor units, 80% on 5 compressor units or 66.3% not calling for a shutdown with the unit switch 'ON' and
on 6 compressor units. The second stage of limiting is the remote stop/start input closed, terminals 13 and 14
only available on 5 and 6 compressor units,40% of unit (-ARB circuit board on YLAA and YLAE units) and 13
on 5 compressor units or 33% on 6 compressor units. and 51 (-XTBC1 on YCWL/YCRL units).
Remote unload when using remote contacts is available
when either REMOTE or LOCAL is selected for LOCAL / The contact must be used to ensure that the
REMOTE MODE under the OPTION key. pump is running in the event of a 'Leaving
Liquid Temperature Cutout'.
Simultaneous operation of Load Limiting and
EMS-PWM Temperature Reset is not possible.
However Load Limiting when using remote unload
contacts can be implemented if the analog temperature The pump contact will not close to run the pump if the
reset is used. unit has been powered up for less than 30 seconds, or if
the pump has run in the last 30 seconds, to prevent
1.1.10 Fan Full Speed Inhibit (110 V circuit) pump motor overheating.
YLAE Units with Dual Speed Fans only
1.1.13 Alarms
To reduce unit noise the fans can be limited to run at a
maximum step of all fans in star (reduced speed) i.e. fan Contacts are provided on -ARB circuit board on YLAA
full speed is inhibited. Connect a customer voltage free and YLAE units and -XTBC2 on YCWL/YCRL units,
contact to terminals 33 & 34 (-ARB circuit board). which can be used to remotely signal alarms. The
contacts are normally open (N.O.) and will close when
The contact must be rated for 110 Vac, connecting control power is applied to the panel, if no fault
wiring does not need to be run in screened cable. When conditions are present. When a fault occurs which locks
the contact is closed fan full speed inhibit is in effect. out a system or the unit power is lost, the contacts open.
To obtain a system alarm signal, connect the alarm
1.1.11 Fan Full Speed Inhibit (30VDC Circuit) circuit to terminals 29 and 30 for No. 1 system and
YLAA Units with Dual Speed Fans only terminals 31 and 32 for No. 2 system.
To reduce unit noise the fans can be limited to run at a 1.1.14 System Run Status
maximum step of all fans in star (reduced speed) i.e. fan
full speed is inhibited. Connect a customer voltage free System run status is indicated by closure of contacts on
contact to terminals 13 & 16 (-ARB circuit board). When -ARB circuit board on YLAA and YLAE units and
the contact is closed fan full speed inhibit is in effect. -XTBC2 on YCWL/YCRL units, terminals 25 and 26 for
system 1 and terminals 27 and 28 for system 2.
1-4
Form 201.26.OI1(11/09)
2 Operation As the load decreases below the 'SETPOINT', the
compressors will be shut down in sequence. This will
The operating sequence described below relates to occur at intervals of either 30, 15 or 10 seconds based
operation on a cooling demand start after power has on the liquid temperature as compared to 'SETPOINT',
been applied, such as start-up commissioning. and control mode.
When power is applied to the unit a 2 minute timer will When the last compressor in each system is to be
start. This timer also prevents instantaneous starting cycled off, the system will initiate a pump-down. On a
after a power failure if the option POWER FAILURE non-safety, non-unit switch shutdown, the YLLSV will be
RESTART is set to AUTOMATIC under the OPTION turned off, and the last compressor will be allowed to run
key. until the suction pressure falls below the suction
pressure cut-out or for 180 seconds, which ever comes
If the option POWER FAILURE RESTART is set to first.
MANUAL under the OPTION key the unit switch must be
set to OFF then back to ON to reset the unit lockout 2.1 Capacity Control
condition UNIT FAULT: 115VAC UNDER VOLTAGE.
The control system will evaluate the need for cooling by
For a unit to run, the unit switch and the software system comparing the actual leaving chilled liquid temperature
switches under the option key must be set to on, any to the desired 'SETPOINT', and regulate the leaving
remote cycling contacts must be closed, the 'Daily chilled liquid temperature to meet that desired
Schedule' must be scheduling the unit on, and a 'SETPOINT'.
temperature demand must be present. The status
message will read 'FLOW SWITCH OPEN' for 30 The leaving chilled liquid 'SETPOINT' is the
seconds after which a contact closes to start the temperature the unit will control to within +/- the
evaporator pump. On the closing of the flow switch the 'RANGE'. The Setpoint High Limit is the 'SETPOINT'
remaining time on the 120 second anti-recycle timers plus the 'RANGE'. The Setpoint Low Limit is the
will be displayed. 'SETPOINT' minus the 'RANGE'.
At the end of the 2 minute timer, the microprocessor will The 'RANGE' setting takes into account the number of
check for cooling demand. If all conditions allow for a compressors on the unit and the temperature difference
start, the first compressor on the lead system will start between leaving (LCHLT) and return (RCHLT) chilled
and the liquid line solenoid will open. Coincident with the liquid at full load (refer to Section 7.1 for details).
start, the anti-coincident timer will be set and begin
Low Limit SETPOINT High Limit
counting downward from '60' seconds to '0' seconds.
RANGE RANGE
10 s unloading 10 s unloading 15 s unloading 30 s unloading
If the unit is programmed for 'Automatic Lead/Lag
60 s loading
Control', the system with the shortest average run-time
(no compressor staging)
of the compressors will be assigned as the 'lead'
system. A new lead/lag assignment is made whenever
Leaving Liquid
LLTC + 0.6°C
all systems shut down. 5.8°C 6.4°C 6.7°C 7.8°C 8.9°C
Temp. Cut-out Leaving Chilled Liquid Temperature
After 1 minute of compressor run time, the next
(LLTC)
compressor in sequence will start when a system has to
load. Additional compressors will be started at 60
second intervals as needed to satisfy temperature load. Each system has its own anti-recycle timers. The
anti-recycle time under the PROGRAM key can be
If demand requires, the lag system will come on with the programmed between 240 and 600 seconds and sets
same timing sequences as the lead system. However the minimum start-to-start time of the lead compressor
the lead system must be running for a minimum of 5 in a system. Due to lead lag rotation in a system,
minutes before the lag system will be allowed to run. consecutive lead compressor starts are not with the
same compressor. A second non-programmable
anti-recycle timer, stop to start is fixed at 90 seconds,
starts to countdown when the lead compressor in a
systems cycles off.
1-5
Form 201.26.OI1(11/09)
The lag compressors in a system, are not controlled by If both systems are available to load the system with the
the anti-recycle timer. They have no start to start timer lowest number of compressors running will load. If both
other than the effect of system lead/lag rotation and the systems have the same number of compressors
load/unload timers. For a given compressor this gives a running the lead system will load.
minimum start to start time of 140 seconds on systems
with 2 compressors or 210 seconds on systems with 3 On units without soft start the strategy for compressor
compressors. Their minimum stop to start time for a loading within a system is to maximize individual
given compressor is 60 seconds, the 60 second load compressor run time and ensure that the same
timer. compressor does not start twice in a row. This is
achieved by rotating the lead/lag sequence of the
When the leaving chilled liquid temperature is above the compressors in a system when a compressor other than
Setpoint High Limit, the lead compressor on the lead the lag most compressor in that system stops. In
system will be energised along with the liquid line achieving this objective no attempt will be made to
solenoid. equalize each compressors individual total run hours
within a system.
After 60 seconds of run-time if the leaving chilled liquid
temperature is still above the Setpoint High Limit and the On units with soft start the compressor in each system
leaving chilled liquid temperature is not falling faster with soft start is always the last to start. Compressors
than the programmed RATE SENSITIVITY within the are always started in the same order, No1 compressor
programmed RATE CONTROL TEMPERATURE first.
R A N G E o r a b o v e th e R A T E C O N T R O L
TEMPERATURE RANGE at 1.7°C per minute, the next If the chilled liquid temperature falls below the Setpoint
compressor in sequence will be energised. High Limit but is greater than the Setpoint Low Limit,
loading and unloading do not occur. This area of control
Additional loading stages are energised at a rate of one is called the 'CONTROL RANGE'.
every 60 seconds if the chilled liquid temperature
remains above the Setpoint High Limit and the same If the chilled liquid temperature drops to less than
criteria on leaving chilled liquid temperature rate of 0.28°C below the Setpoint Low Limit, unloading occurs
change as above are met. at a rate of 30 seconds. If the chilled liquid temperature
falls to a value greater than 0.28°C below the Setpoint
The strategy for loading/unloading is design to meet the Low Limit but not greater than 0.83°C below the Setpoint
following criteria: Low Limit, unloading occurs at a rate of 15 seconds. If
the chilled liquid temperature falls to a value greater
1. Minimise system starting and stopping; than 0.83°C below the Setpoint Low Limit, unloading
occurs at a rate of 10 seconds. If the leaving chilled
2. The lag system is not available to start until the lead liquid temperature falls to 0.6 °C above the leaving liquid
system cannot load further and has been running for temperature cutout, unloading occurs at a rate of 10
5 minutes; seconds.
3. When both systems are running, balance loading / If more than one compressor is running in a system then
unloading between them. on unloading the compressor to be stopped is not the
same compressor stopped during the last unload
With both systems running the next system to load is sequence. This is achieved by rotating the lead lag
determined by the following rules; sequence of the compressors in a system when a
compressor in that system stops.
1. The system must not be fully loaded or pumping
down; The leaving chilled liquid 'SETPOINT' is programmable
from 4.4°C to 21.1°C in the chilled liquid water mode and
2. Remote load limit, suction limiting or discharge from -7°C to 21.1°C in chilled liquid glycol mode. In both
limiting must not be in effect on the system. modes, the 'RANGE' can be from +/-0.8°C to 1.4°C. A
low temperature glycol unit is available which will go
down to -13°C.
1-6
Form 201.26.OI1(11/09)
To ensure that the Setpoint Low Limit cannot be 2.3 Anti-Coincidence Timer
inadvertently set to low when setting the Setpoint and
Control Range in the water cooling mode the software The anti-coincidence timer prevents both systems from
makes the following adjustments. If as a result of starting simultaneously. This assures that the inrush
Setpoint and Control Range setting the Setpoint Low current is kept to a minimum. A 60 second time delay will
Limit would be below 4.4°C the software will set the always separate motor starts. This timer is not
Setpoint Low Limit to 4.4°C and raise the Setpoint High programmable.
Limit by the difference to maintain the same Control
Range. 2.4 Compressor Crankcase Heater
To ensure reliable operation of the unit the software will Each compressor is fitted with a crankcase heater (not
modify the operation of the 'Leaving Chilled Liquid controlled by the micro processor) which is ON when the
Control' as follows: compressor is OFF.
1. If the run time of the lead system is less than 5 2.5 Pumpdown (YLLSV) Control
minutes the Setpoint High Limit is increased up to a
maximum of 10°C by the 'Setpoint Adjust Value' Each system has a pumpdown feature at shut-off. On a
shown in the following graph. Any adjustment value non-safety, non-unit switch shutdown, all compressors
in excess of the value taking the Setpoint High Limit but one in the system will be shut off. The liquid line
to 10°C is taken from the Setpoint Low Limit. When solenoid (YLLSV) will also be turned off. The final
the run time exceeds 5 minutes the 'Setpoint Adjust compressor will be allowed to run until the suction
Value' returns to zero. This will occur whilst the unit pressure falls below the cut-out or for 180 seconds,
is running. Pressing the 'COOLING SETPOINTS' which ever comes first. Systems can be manually
key four times will display the lead system's last run pumped down, using the system switches under the
time and the 'Setpoint Adjust Value'. 'OPTIONS' key.
2. If the run time of the lead system is less than 5 2.6 Evaporator Solenoid Valve (YESV) Control
minutes on 3 successive occasions, the anti-recycle YLAA Units only. System 1 on models 220HE,
timer will be doubled, with a maximum allowable 240SE & 260HE, System 2 on models
anti-recycle value of 10 minutes. 240SE,260HE, 285 & 300HE.
Setpoint Adjust Value (°C)
3.0 The valve is always closed when the system is not
2.5 running. The valve is open by timer KT for the first 300
seconds of system operation. This prevents low suction
2.0
pressure problems on system start. On low ambient
1.5 units a solenoid valve is fitted on each system, but the
timer KT is only fitted and operated as described on the
1.0
models and systems above. On low ambient units this
0.5 solenoid valve opens when the system is running
0.0
provided the ambient temperature is below 4.4°C. The
0 1 2 3 4 5 valve will close when the ambient temperature rises
Last run time of lead system (minutes) above 7.2°C provided KT is not fitted and acting to open
the valve.
2.2 Anti-Recycle Timer
2.6.1 YLAA Low Ambient Unit
Each system has its own anti-recycle timers. The
anti-recycle time under the PROGRAM key can be Low Ambient Kit
programmed between 240 - 600 seconds and sets the
minimum start-to-start time of the lead compressor in a Each system on all low ambient units is fitted with an
system. A second non-programmable anti-recycle Evaporator Solenoid Valve (YESV) which operates as
timer, stop to start is fixed at 90 seconds, starts to describe above. On systems with less than 4 fans a fan
countdown when the lead compressor in a systems speed controller is fitted to fan No1. Fan contactor KF1
cycles off. On power up only this timer is set to 120 is wired to energize when the system starts and the
seconds not 90 seconds. speed of the fan is controlled according to discharge
pressure. The remaining fans are controlled as normal.
The lag compressor(s) in a system, are not controlled by A heater is also fitted to the power element on the TXV
the anti-recycle timer as part of the low ambient kit. The heater is on when the
ambient temperature is below 4.4°C. The heater is off
when the ambient rise to above 7.2°C
1-7
Form 201.26.OI1(11/09)
2.7 Lead/Lag Control YLAA MODEL SYSTEM 1 SYSTEM 2
0180SE to 320SE 2 2
The chiller may be set up for AUTO or MANUAL 0195HE to 0260HE
lead/lag. This is accomplished by programming the 0360SE, 0400SE 3 2
option under the 'OPTIONS' key. 0300HE
0390HE 4 2
When AUTO lead/lag is used, the microprocessor
attempts to balance run time between the systems. A 0435SE, 0485SE 3 3
0350HE
number of conditions can occur which will prevent this
from happening. Factors determining lead/lag selection 0440HE 4 3
and the resulting lead/lag determination are: 0455HE, 0515HE 4 4
YLAE MODEL SYSTEM 1 SYSTEM 2
The microprocessor automatically defaults the lead to
0190SE to 330SE 2 2
system 1 and the lag to system 2 if both systems are 0195HE to 0265HE
ready to start (Anti-recycle Timers timed out) and the
0315HE 3 2
systems have equal run time.
0375SE to 0490SE 3 3
0355HE to 0405HE
If both systems are waiting to start (Anti-recycle timers
0465HE to 0510HE 4 4
have not timed out), the microprocessor will assign the
lead to the system with the shortest anti-recycle time to
provide cooling quickly. Low Ambient Units
If the lead system is locked out, faulted and waiting to On systems with 2 or 3 fans, fan number 1 is replaced by
restart the lag system is swapped to the lead. a variable speed fan. On system 2 of YLAA180SE,
195HE and 210SE the two small fans are replace by one
MANUAL lead/Lag selection will be automatically variable speed fan. The fan is not controlled by the
overridden by the microprocessor to allow the lag discharge pressure stages but is energized directly from
system to automatically become the lead anytime the the fan fuses when the unit power is turned on. The fan
selected lead system shuts down due to, lead system motor has a integral invertor which controls fan speed to
faults. maintain a pressure between 18 and 22.5 barg. Below
18 barg the fan should be off, above 22.5 barg the fan
Automatic switch over in MANUAL mode is provided to should be at full speed, with a linier response between
try to maintain chilled liquid temperature as close to these two pressures. A separate 4-20ma pressure
‘SETPOINT’ as possible. transducer (-BFDP) is wired via a relay (-KF1) to the fan.
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