Johnson Controls YORK YLCA 40 User manual

Air-condensed water chillers and
heat pumps YLCA / YLHA 100, 120
and 150
User manual
Ref.: N-40291_EN 0112

Index
1User manual ............................................................................................................................1
1.1 General description of the unit.................................................................................................2
1.1.1 Models available and capacities...............................................................................................2
1.1.2 Technical specifications...........................................................................................................4
1.1.3 Operating instructions µC3 (YLCA / YLHA 100, 120 and 150).................................................7
1.1.4 Regular maintenance activities for which the user is responsible..........................................24
Index
i

1
User manual

1.1 General description of the unit
The YLCA/YLHA units are high-performance air-water chillers and heat pumps using R-410A ecological
coolant.
These units are designed for air conditioning or industrial applications that require cold or hot water.
They are silent and compact units, equipped with vertical air discharge axial fans, that can be installed
directly outdoors.
They are available in two versions: with and without a hydro kit, which includes a buffer tank and a high
head pressure pump.
The control system of these units is a specially programmed electronic controller to be used on air-water
coolers and heat pumps equipped with tandem compressors. Easy to use and safe, these units precision
control the water return temperature of the installation, carry out defrost cycles, modulate fan speeds
and control compressor, pump and electric heater start-up. By reading the control probes and safety
elements, the controller protects the entire equipment against malfunctions. The system allows
connecting the unit to a standard RS-485 monitoring network.
For further information, please see Operating Instructions.
The YLCA/YLHA units are made of proven quality components and manufactured in compliance with
standards in force (ISO 9001 certification).
1.1.1 Models available and capacities
Cool-only
model YLCA 40 YLCA 50 YLCA 60 YLCA 80 YLCA 100 YLCA 120 YLCA 150
Cooling ca‐
pacity(1) 39,3 51,8 60,1 72,1 100,3 118,5 150,5
Cooling ca‐
pacity(2) 39,6 52,1 60,5 72,6 101 119 151
(1) Net cooling capacities in kW for 7 °C of water inlet/outlet temperature and 35 °C of ambient temperature according
to the EUROVENT EN14511:2011 certification
(2) Gross cooling capacities in kW for 7 °C of water inlet/outlet temperature and 35 °C of ambient temperature ac‐
cording to the EUROVENT EN14511:2011 certification
Heat pump
model YLHA 40 YLHA 50 YLHA 60 YLHA 80 YLHA 100 YLHA 120 YLHA 150
Cooling ca‐
pacity(1) 37,6 51,7 60,1 71,7 95,4 113,6 144,5
Heating ca‐
pacity(2) 39 52,8 60 75,2 104,6 120 150,5
Cooling ca‐
pacity(3) 37,8 52 60,5 72,2 96 114 145
Heating ca‐
pacity(4) 38,6 52,5 59,6 74,7 104 119,6 150
(1) Net cooling capacities in kW for 7 °C of water inlet/outlet temperature and 35 °C of ambient temperature according
to the EUROVENT EN14511:2011 certification
(2) Net heating capacities in kW for 45 °C of water inlet/outlet temperature and 7 °C of ambient temperature according
to the EUROVENT EN14511:2011 certification
(3) Gross cooling capacities in kW for 7 °C of water inlet/outlet temperature and 35 °C of ambient temperature ac‐
cording to the EUROVENT EN14511:2011 certification
(4) Gross heating capacities in kW for 45 °C of water inlet/outlet temperature and 7 °C of ambient temperature ac‐
cording to the EUROVENT EN14511:2011 certification
1 User manual
1.1 General description of the unit
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User manual 1
General description of the unit 1.1
3

1.1.2 Technical specifications
These units are supplied completely factory-assembled and with all coolant tubing and wiring ready for
installation on site. After mounting, these units must go through an operational test with water. Coolant
leaks will also be checked during this process.
Sheeting cover
The units are made of galvanized steel sheeting and anticorrosion nuts and bolts. Panels can be removed
for access to internal components. The casing parts are painted with white RAL9001 oven-baked
polymerized enamel.
Compressors
One, two or four hermetic Scroll compressors are used, mounted in tandem on rails and antivibratory
supports. The compressors are connected for operation with one single cooling circuit. Start-up is carried
out by two independent starters. These compressors are equipped with mechanical elements that protect
them against high operating temperatures. The sump heaters operate only when the compressor is
inoperative.
Water-side exchanger
Comprises a stainless steel plate exchanger, adequately insulated by a layer of closed-cell elastomer
foam. Includes an antifreeze heater monitored by the controller. The coolant side of said exchanger
accepts an operating pressure of 45 bar, whereas the water side accepts 10 bar. When the unit includes
a hydro kit, maximum admissible pressure on the water side is 6 bar (adjustment of the tank safety valve).
Air-side exchanger
Made up of two notched aluminium blue fin coils and grooved copper tubing mechanically expanded
within the fin assembly.
Fans
Of the axial and low sound level type. Equipped with single-phase motors with IP54 protection. These
motors allow speed control by means of a phase cut-out shifter controlled by the unit controller. This
allows unit operation at low ambient temperatures (-10°C). On cool only units with an optional low ambient
temperature kit can reach ‑18°C. On heat pumps, the fan will remain inoperative during defrosting.
Electrical and control panel
Located at the front of the unit, and with IP44 protection. The operating and control components are
factory mounted, wired and tested. The door of this control panel is equipped with a locking isolator that
turns power supply off. Inside we find the contactors for compressors and the pump, the transformer,
magneto-thermal protectors, controller electronic plates, speed control, connecting strip and the
keyboard-display with the unit controls.
Control keyboard-display
This device is accessible through an external leak-tight plastic cover. This is an easy-to-use control with
three access levels: direct, user (password) and factory (password). For further information, please see
Operating Instructions.
Cooling circuit
The cool only unit cooling circuit includes: expansion valve, filter-dryer, liquid sight glass, high and low-
pressure switches, service valves for isolating the condensing unit, and Schrader valves on the high and
low sides. The heat pump model also includes, in addition, a four-way valve (energized in summer cycle
and during defrosts), retaining valves, a heat cycle expansion valve and a liquid tank. The suction tubing
is coated with closed-cell elastomer.
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1.1 General description of the unit
4

Hydro kit (pack)
These units include a pack assembled with the components of a hydro kit. This assembly is located within
the unit frame and does not increase the footprint of same. It includes the following components: Lined
buffer tank and with an antifreeze heater, centrifugal pump, expansion vessel charged with nitrogen at
1.5 bar, safety valve set to 6 bar, water circuit, pressure gauge, two air bleed valves, filling valve and
drain valve. Also includes a mesh filter for the water circuit. This filter is supplied loose for installation at
the most convenient point.
Flow switch
Assures sufficient water flow when the unit is in operation.
Options and accessories
Units without hydro kit
This includes the elements described in the previously mentioned specifications, less the hydro kit (pack).
The water circuit includes an air bleed valve. Connections are ready for on-site installation.
Two pumps
Accessory available with models 50 to 150 with hydro kit. The second pump becomes operative when
the thermal magnetic switch protector of the first pump is activated (models 50, 60 and 80), or through
the controller program (models 100, 120 and 150).
Water filter
Supplied as a standard element on units including the hydro kit. Stainless steel mesh with 1 mm. diameter
perforations. Optional on units not including the hydro kit. The warranty of the unit will not be valid if a
water filter has not been installed.
Remote control
Wall-mounted remote control unit with keyboard for cool/heat and ON/OFF functions. Includes LEDs for
power supply, alarm and cool/heat. Maximum cable length: 50 m.
Remote terminal
For total access and control of the system by means of the display and buttons. It allows for selection of
cool, heat and off functions. Operating parameters can also be modified and the system can also be
supervised. Can be installed at a maximum distance of 1040 m.
BMS connections
With a serial board it is possible to connect the system to a standard RS-485 monitoring network.
Low sound level units (LN)
Include anti-noise covers mounted on the compressors and sound isolating plates, covering the
compressor chamber.
Gentle starter
For the soft motor start. Specially designed for Scroll compressors. (Maximum outdoor temperature: 50
°C).
Protecting grids
To protect the coils from possible impacts. Made of steel rods and painted with oven baked polymerized
white enamel (RAL9001).
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General description of the unit 1.1
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Antivibration supports
Whenever necessary to reduce vibrations and noise
produced by the unit to a maximum, a set of steel
spring antivibratory supports can be used. These
should be installed between the chassis support of the
unit and the base or floor on which it is to sit.
This base must be solid and dimensioned in
accordance with the load to be supported.
The antivibratory support accessory for models
YLCA/YLHA 40, 50 and 60 includes 4 units, whereas
for models YLCA/YLHA 80, 100, 120 and 150
includes 6.
These spring supports should be distributed and
fastened in the drilled holes at the base of the cooler,
the location of which is detailed in the General
Dimensions section.
YLCA/YLHA 40
50
YLCA/YLHA 50 ÷ 150
Ø 10
Ø 75
125
14,5
80
86
115
14,5
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1.1 General description of the unit
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1.1.3 Operating instructions µC3 (YLCA / YLHA 100, 120 and 150)
This is a specially programmed controller for air-water coolers and heat pumps with four capacity stages.
These are divided into two independent cooling circuits equipped with two tandems that act upon a
common water circuit. Both systems are equipped with two fans each, the speed of which is controlled
by pressure sensors. The controller operates through the following intakes and outlets.
Digital inputs
ID1 ‑ J1/8 General protection (PG)
ID2 ‑ J1/1 Flow switch (FS)
ID3 ‑ J1/9 Remote ON/OFF (ROO)
ID4 ‑ J1/2 Pump protector No. 1 (Q5)
ID5 ‑ J1/10 Low-pressure switch circuit 1 (LP1)
ID6 ‑ J4/8 High-pressure switch circuit 1 (HP1)
ID7 ‑ J4/1 Thermal protector compressor 1 (THPC1)
ID8 ‑ J4/9 Thermal protector compressor 2 (THPC2)
ID9 ‑ J4/2 Thermal protector circuit 1 fans (THPF 1-2)
ID10 ‑ J4/10 Low-pressure switch circuit 2 (LP2)
ID11 ‑ J7/6 High-pressure switch circuit 2 (HP2)
ID12 ‑ J7/1 Thermal protector compressor 3 (THPC3)
ID13 ‑ J7/8 Thermal protector compressor 4 (THPC4)
ID14 ‑ J7/3 Thermal protector circuit 2 fans (THPF 3-4)
ID15 ‑ J7/9 Remote COOL/HEAT (RCH)
ID18 ‑ J7/5 Pump protector No. 2 (Q6)
Digital outputs
N01/C1-2 Compressor 1 circuit 1 (K1)
N02/C1-2 Compressor 2 circuit 1 (K2)
N05/C5 Pump 1
N06/C6-7 Compressor 3 circuit 2 (K3)
N07/C6-7 Compressor 4 circuit 2 (K4)
N08/C8-9 Pump 2
N010/C10 Alarm
N011/C11-12 Antifreeze heater circuit 1-2
N012/C11-12 Back-up heater
N013/C13-14 4-way valve circuit 1 (V4V1)
N014/C13-14 4-way valve circuit 2 (V4V2)
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Analogue inputs
B3 ‑ J2 Coil pressure circuit 1
B4 ‑ J3 Coil pressure circuit 2
B5 ‑ J4/13 Water temperature at exchanger inlet
B6 ‑ J4/12 Water temperature at exchanger outlet
Analogue outputs
Y3 Circuit 1 fan speed control (PWM)
Y4 Circuit 2 fan speed control (PWM)
System components
The system is made up of the following basic components:
• Touch screen
• µC3 controller
• Fan speed controllers (FSC1 and FSC2)
• Pressure sensors (B3 and B4)
• NTC probes (B5 and B6)
Touch screen
This consists of a screen and six keys with the
following functions:
• Alarm ‑2-
• Programming ‑1-
• Esc (Escape)
• Up ‑3-
• Enter ‑4-
• Down ‑5-
The following functions can be selected from this
screen:
• ON/OFF
• COLD/HEAT
• Read the unit status
• Access the configuration menus (by means of a password)
• Read the alarm messages and reset these alarms
• Read operating pressures and temperatures
• etc...
µC3 controller
This contains the unit software and the entire digital
and analogue input and output connector system.
This module is also equipped with connectors for the
program download key and the serial communication
connection to an RS-485 monitoring system.
122 44
33
5
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1.1 General description of the unit
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Sensors and probes
Pressure sensors (B3 and B4)
One for each cooling circuit and connector to the coil collectors. They provide information to the system
for fan speed adjustment in the summer and winter cycles, management of defrosts in the heat pumps,
prevent and lockout functions of the system by excessively high pressure.
NTC probes (B5 and B6)
• B5- For the detection and control of water inlet temperature (cool only and heat pump units).
• B6- For the detection of water outlet temperature. It provides information for antifreeze protection and
control of the antifreeze and backup heaters. If required, allows controlling water temperature at the
heat exchanger discharge
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General description of the unit 1.1
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General diagram, (YLCA / YLHA 100,120 and 150)
Q
R
S
AB
T
M
U
V
A1 C1
E1 F1 G1
H1
J1
B1
D1
D E H
K
C JI
O
P2
Y
X
A1 Z
M1K1 P1O1
AKeyboard ‑ display terminal U Water outlet
B Programme download key V Water inlet
D/J/C/I Comp. 1/ Comp. 2 / Comp. 3 / Comp. 4 X Fan protection 1–2
E/H Pump 1/ Pump 2 Y/A1/G1/
I1
Protection comp. 1 / Protection comp. 2 / Protec‐
tion comp. 3 / Protection comp. 4
K RS-485 serial connection Z/H1 HP1 / HP2 (High-pressure switch)
L Phase (board power supply) C1 Fan 3.4
M General protection D1 Fan 1.2
N Neutral (board power supply) F1 Fan protection 3.4
O Remote ON / OFF J1 Remote COOL / HEAT
P2/B1 LP1 / LP2 (Low-pressure switch) K1 Four-way valve, circuit 1
Q/E1 Pump 1 protection / Pump 2 protection M1 Four-way valve, circuit 2
R Flow switch O1 Antifreeze heater
S/T Circuit 1 pressure sensor / Circuit 2 pressure sensor P1 Back-up heater
1 User manual
1.1 General description of the unit
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Start-up
About 45 seconds after powering the unit, the start-up display is activated.
Default language: English.
1st display. START
(information on water temperature/unit status)
• Water inlet temperature
• Water outlet temperature
• Unit status (ON/OFF)
Press "down" to access the second display.
2nd display. STATUS AND OPERATING MODE SELECTION
Status selection ON/OFF (with ENTER, Up and Down).
On the heat pump units, select the COOL/HEAT operating mode (with ENTER, Up and Down).
Press ESC to return to the 1st display.
SYSTEM CONFIGURATION
(For authorised servicing personnel only)
3rd display. ENTER PASSWORD
The 3rd Enter password display is accessed by pressing Up from the 1st display (Start-up), or Down
from the 2nd display (Status / operating mode selection)
1. From the Enter password display, press ENTER.
2. Enter the password using the Up key.
3. Press ENTER to access the 4th Menu display.
4th display. MENU
From this display we can access a set of submenus that provide information on the unit or allow for its
operating parameters to be configured. These submenus are as follows:
-/- Probes Sensors config.
-A- Antifreeze Antifreeze
-B- Input/output Input/output
-c- Compressors Comps. conf.
-d- Defrost Defrost
-F- Condensation (fans) Condensation
-H- Unit configuration Unit config.
-P- Alarms Alarm settings
-r- Temperature control Control param.
-Fr- Software version / language selection Soft. version
-t- Time (not available) Time config.
To enter a submenu:
1. Select it using the Up or Down key and then activate it using the ENTER key
2. Once the parameters are set with the ENTER, Up and Down keys, press Prg to confirm the
modification and return to the MENU display.
3. To exit the MENU display, press the Esc key.
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General description of the unit 1.1
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-/- Configuration of probes
Description Range Units Value
Probe B3 calibration. Coil pressure circuit 1 -9,9/9,9 bar 0
Probe B4 calibration. Coil pressure circuit 2 -9,9/9,9 bar 0
Probe B5 calibration. Inlet water temp. to exchanger. -9,9/9,9 °K 0
Probe B6 calibration. Outlet water temp. to exchanger. -9,9/9,9 °K 0
Probe B7 calibration. Outdoor temperature -9,9/9,9 °K 0
Probe B8 calibration. Dynamic set point -9,9/9,9 % 0
Enabling probe B1 YES/NO - NO
Enabling probe B2 YES/NO - NO
Enabling probe B3. Coil pressure circuit 1 YES/NO - YES
Enabling probe B4. Coil pressure circuit 2 YES/NO - YES
Enabling probe B5. Inlet water temp. to exchanger. YES/NO - YES
Enabling probe B6. Outlet water temp. to exchanger. YES/NO - YES
Enabling probe B7 YES/NO - NO
Enabling probe B8 YES/NO - NO
Enabling probe B9. YES/NO - NO
Enabling probe B10. YES/NO - NO
Probe B3 configuration. Minimum value -30/150 bar 0
Probe B3 configuration. Maximum value -30/151 bar 45
Probe B4 configuration. Minimum value -30/152 bar 0
Probe B4 configuration. Maximum value -30/153 bar 45
-A- Antifreeze
Description Range Units Value
Antifreeze alarm set point -99,9/99,9 °C 3
Antifreeze alarm set point differential 99,9 °K 5
Lower antifreeze alarm set point limit -99,9/99,9 °C 3
Upper antifreeze alarm set point limit -99,9/99,9 °C 5
Antifreeze alarm reset MANUAL
AUTOMATIC - MANUAL
Antifreeze alarm delay (If automatic reset has been selected) 0/540 Minutes 0
Antifreeze heater trigger set point -99,9/99,9 °C 3
Antifreeze heater trigger set point differential -99,9/99,9 °K 2
Auxiliary heater trigger set point (winter cycle) -99,9/99,9 °C 25
Auxiliary heater trigger set point differential (winter cycle) -99,9/99,9 °K 5
Auxiliary heater trigger delay 0/60 Minutes 15
Automatic enabling of the frost protection system with the unit OFF
DISABLED
HEATER AND PUMP
HEATER AND UNIT HEATER
-
HEATER AND PUMP
(YLCA)
HEATER AND UNIT
HEATER (YLHA)
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1.1 General description of the unit
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-C- Compressor configuration
Description Range Units Value
Min. operating time of a compressor 0 / 9999 Seconds 120
Min. stoppage time of a compressor 0 / 9999 Seconds 60
Start-up time between different compressors 0 / 9999 Seconds 3
Start-up time of one compressor 0 / 9999 Seconds 300
Start-up time between pump and compressor 0 / 999 Seconds 20
Stoppage time between compressor and pump 0 / 999 Seconds 20
Pump 1 operating hours
Pump 2 operating hours
Compressor 1 operating hours
Compressor 2 operating hours
Compressor 3 operating hours
Compressor 4 operating hours
Operating hours for pump maintenance alarm 1000 / 999000 Hours 0 x 1000
Operating hours for compressor 1 / circuit 1 maintenance alarm 1000 / 999000 Hours 0 x 1000
Operating hours for compressor 2 / circuit 1 maintenance alarm 1000 / 999000 Hours 0 x 1000
Operating hours for compressor 1 / circuit 2 maintenance alarm 1000 / 999000 Hours 0 x 1000
Operating hours for compressor 2 / circuit 2 maintenance alarm 1000 / 999000 Hours 0 x 1000
Tandem compressor rotation time Minutes 20
Enabling of compressors C1/1, C2/1, C1/2, C2/2 YES/NO YES
Forced manual compressor operations YES/NO NO
-d- Defrost
When a defrost cycle is being carried out, the message DEFROST REQ appears on the start-up display.
Description Range Units Value
Defrost probe selection
Pressure temp.
- Pressure
Pressure switch
Separate or simultaneous defrost (contemporaneous)
Separate
- Separate
Simultaneous
End defrost by interval of
Time
- Temp. / Pressure
Temp. / Pressure
Defrost start pressure -99,8 / 99,9 bar 5,8
Defrost end pressure -99,8 / 99,9 bar 26
Defrost call delay 1 / 32000 Seconds 180
Max. defrost time 1 / 32000 Seconds 420
Min. defrost time 1 / 32000 Seconds 0
Timing between defrosts of a single circuit 1 / 32000 Seconds 1800
Timing between defrosts of different circuits 1 / 32000 Seconds 300
Forced compressor stoppage time at start and end of defrost 0 / 999 Seconds 0
4-way valve inversion delay 0 / 999 Seconds 0
Manual defrost
Enabled
- Disabled
Disabled
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-F- Condensation (fans)
Description Range Units Value
Type of fan control Temp. pressure ON/OFF - Pressure
No. of condensers 1-2 - 2
Control device
Fans -
Inverter
Inverter -
Power supply frequency 50 / 60 Hz 50
PWM max. triac cut-off 0 / 100 % 92
PWM min. triac cut-off 0 / 100 % 35
Triac impulse duration 0 / 10 ms 2
Condensing pressure in summer cycle 0 / 99,9 bar 21
Condensing pressure differential in summer cycle 0 / 99,9 bar 5
Evaporating pressure in winter cycle 0 / 99,9 bar 9,5
Evaporating pressure differential in summer cycle 0 / 99,9 bar 1,5
Min. fan speed differential -99,9 / 99,9 bar 3
Max. inverter speed 0 / 10 V 10
Min. inverter speed 0 / 10 V 1
Inverter speed-up time 0 / 999 Seconds 5
Prevent function activation (HP) YES/NO - YES
Selection of probe for HP prevention
Pressure
- Pressure
Temperature
HP prevention pressure -99,9 / 99,9 bar 38
HP prevention pressure differential 0 / 99,9 bar 4
LP prevention pressure -99,9 / 99,9 bar 3
LP prevention pressure differential 0 / 99,9 bar 1,5
Fan management in case of probe failure
Fan OFF
Fan OFF
Fan ON and Compressor ON
Prevent function timing 0 / 99 Seconds 0
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1.1 General description of the unit
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-H- Unit configuration
Description Range Units Value
Unit type 0 ‑ 7 - 2 (YLCA)
3 (YLHA)
Number of compressors/circuits - 4 / 2
Compressor rotation
LIFO
FIFO
PERSONALISED
TIME
- FIFO
No. of evaporators 1 ‑ 2 - 1
Driver number (EVD400) 0-1-2-4 - 0
Cycle inversion valve logic NO / NC - NC
No. of pumps 1 ‑ 2 - 1 (SINGLE PUMP)
2 (TWO-PUMP ACCESSORY)
Pump rotation START-UP
TIME - TIME
Pump operation
ON WITH COMP. ON
ALWAYS OFF
ALWAYS ON
SAFETY ON/ OFF
ALWAYS ON
No. of hours for pump rotation 0 ‑ 9999 Hours 12
ON/OFF digital input activation YES/NO - NO
WINTER/SUMMER digital input activation YES/NO - NO
ON/OFF activation with Monitor YES/NO - NO
WINTER/SUMMER activation with Supervisor YES/NO - NO
WINTER/SUMMER operation inversion delay Seconds 10
Monitoring protocol
CAREL
GSM MODEM
ANALOGUE MODEM
RS 232
LONWORKS
MODBUS
- CAREL
Selection of communication speed
1200
2400
4800
9600
19200
Bauds 19200
Monitoring ID number 0 ‑ 200 - 1
Selection of language at start-up YES/NO - YES
Restore default values (Warning!) YES/NO - NO
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-B- Inputs/Outputs
Description Range Units Value
Analogue input 3. Coil pressure circuit 1 (B3) bar INSTANT READ OUT
Analogue input 4. Coil pressure circuit 2 (B4) bar INSTANT READ OUT
Analogue input 5. Inlet water temperature (B5) °C INSTANT READ OUT
Analogue input 6. Outlet water temperature (B6) °C 0 = OPEN
C = CLOSED
Digital input 1. External alarm O/C 0 = OPEN
C = CLOSED
Digital input 2. Flow switch O/C 0 = OPEN
C = CLOSED
Digital input 3. Remote ON/OFF O/C 0 = OPEN
C = CLOSED
Digital input 4. Pump 1 protector O/C 0 = OPEN
C = CLOSED
Digital input 5. Low-pressure switch circuit 1 O/C 0 = OPEN
C = CLOSED
Digital input 6. High-pressure switch circuit 1 O/C 0 = OPEN
C = CLOSED
Digital input 7. Thermal protector compressor 1 circuit 1 O/C 0 = OPEN
C = CLOSED
Digital input 8. Thermal protector compressor 2 circuit 1 O/C 0 = OPEN
C = CLOSED
Digital input 9. Fan 1-2 protectors circuit 1 O/C 0 = OPEN
C = CLOSED
Digital input 10. Low-pressure switch circuit 2 O/C 0 = OPEN
C = CLOSED
Digital input 11. High-pressure switch circuit 2 O/C 0 = OPEN
C = CLOSED
Digital input 12. Thermal protector compressor 3 circuit 2 O/C 0 = OPEN
C = CLOSED
Digital input 13. Thermal protector compressor 4 circuit 2 O/C 0 = OPEN
C = CLOSED
Digital input 14. Fan 3-4 protector circuit 2 O/C 0 = OPEN
C = CLOSED
Digital input 15. Remote COOL/HEAT O/C 0 = OPEN
C = CLOSED
Digital input 16. Not used
Digital input 17. Not used
Digital input 18. Pump 2 protector 0 = OPEN
C = CLOSED
Digital output 1. Compressor 1 circuit 1 O/C 0 = OPEN
C = CLOSED
Digital output 2. Compressor 2 circuit 1 O/C 0 = OPEN
C = CLOSED
Digital output 3. (Not used)
Digital output 4. (Not used)
Digital output 5. Pump 1 O/C 0 = OPEN
C = CLOSED
Digital output 6. Compressor 3 circuit 2 O/C 0 = OPEN
C = CLOSED
Digital output 7. Compressor 4 circuit 2 O/C 0 = OPEN
C = CLOSED
Digital output 8. (Not used)
Digital output 9. (Not used)
Digital output 10. External alarm / fuse failure O/C 0 = OPEN
C = CLOSED
Digital output 11. Antifreeze heater O/C 0 = OPEN
C = CLOSED
Digital output 12. Backup heater O/C 0 = OPEN
C = CLOSED
Digital output 13. 4-way valve circuit 1 O/C 0 = OPEN
C = CLOSED
Digital output 14. 4-way valve circuit 2 O/C 0 = OPEN
C = CLOSED
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-P- Alarms
Description Range Units Value
High-pressure alarm set point (transducer B3; B4) 0 / 99,9 bar 41
High-pressure alarm differential (transducer B3; B4) 0 / 99,9 bar 10
Summer low-pressure alarm 0 / 99,9 bar 3
Winter low-pressure alarm 0 / 99,9 bar 2
Defrost low-pressure alarm 0 / 99,9 bar 1
Low-pressure differential 0 / 99,9 bar 1
Low-pressure alarm delay on cold cycle start-up 0 ‑ 999 Seconds 60
Low-pressure alarm delay on heat cycle and defrost 0 ‑ 999 Seconds 0
Water flow control (flow switch) alarm delay on start-up 0 ‑ 999 Seconds 20
Water flow control (flow switch) alarm delay on operating 0 ‑ 9999 Seconds 5
Number of automatic reset alarm stoppages 0 ‑ 4 1
Maximum period for automatic reset alarms 0 ‑ 99 Minutes 60
Alarm selection with automatic reset: compressor thermal breaker AUTOMATIC
/ MANUAL AUTOMATIC
Alarm selection with automatic reset: fan thermal breaker AUTOMATIC
/ MANUAL AUTOMATIC
Alarm selection with automatic reset: low-pressure switch AUTOMATIC
/ MANUAL AUTOMATIC
Alarm selection with automatic reset: high-pressure switch AUTOMATIC
/ MANUAL AUTOMATIC
-r- Control
When this submenu is activated, the dynamic set point temperature appears (if this function is enabled).
Press Down to access the configuration menu.
Description Range Units Value
Set point in COOL °C 12
Set point in HEAT °C 40
Temperature control adjustment range °K 3
COOL set point lower limit °C 6
COOL set point upper limit °C 20
HEAT set point lower limit °C 25
HEAT set point upper limit °C 45
Temperature setting type INPUT / OUTPUT - INPUT
Setting type with input probe PROPORTIONAL / P+I PROPORTIONAL
Integration time in each adjustment P+I 0 / 9999 Seconds 600
Max. increase time of call (output adjustment) 0 / 9999 Seconds 20
Min. increase time of call (output adjustment) 0 / 9999 Seconds 20
Max. decrease time of call (output adjustment) 0 / 9999 Seconds 10
Min. decrease time of call (output adjustment) 0 / 9999 Seconds 10
Temp. differential in which increase and decrease times vary
(output adjustment) -99,9 / 99,9 °C 2
Forced stoppage in COOL cycle (output adjustment) -99,9 / 99,9 °C 5
Forced stoppage in HEAT cycle (output adjustment) -99,9 / 99,9 °C 47
User manual 1
General description of the unit 1.1
17

µC3 functions
F-r. Software version / Language selection
• Read out of the µC3 software version and update date.
• The Up, Down and Enter keys select the language: English or Italian.
Temperature control
Two different modes (Control Menu):
1. Adjustment by water temperature at the heat exchanger inlet (probe B5).
This control carries out a proportional type adjustment based on a set point and a proportional band
distributed over 4 stages. This is the controller default type.
It is also possible to carry out a proportional and integral adjustment. In this case, said function must
be enabled and the integration time set (CONTROL MENU).
Control sensor: B5 ((inlet water temperature to heat exchanger).
Parameters to be used:
• Set point.
• Proportional band for inlet adjustment.
• Type of adjustment (Proportional or Proportional + Integral)
• Integration time (if the Proportional + Integral adjustment has been enabled).
Control outputs: N1, N2, N6 and N7 (compressor contactors).
Description of the operation:
Temperature control depends upon the value measured by the probe located at the water inlet to the
heat exchanger. It follows a proportional logic in which the proportional band is subdivided into four
equal stages that give way to on/off functions of the compressors. In Proportional + Integral operation
behaviour is similar, but affected by al algorithm that takes time into account (integration time
parameter).
STPM
Set point:
A = Cool
B = Heat
RBM Control band
EWT Exchanger inlet temperature
C1, C2, C3, C4 Compressor stages
2. Adjustment by water temperature at the outlet of
the heat exchanger.
Thermostatic control is based on the temperature
value detected by probe B6. Based on the set
point value (STPM) and the control base (RBM), it
defines a neutral temperature zone (NZ).
• The temperature values comprised between
the set point and the set point plus the band (STP≤Temperature≤ STPM + RBM) do not cause
the on/off function of the compressors.
• Temperature values above the set point plus the band (Temperature > STPM + RBM) cause
compressor start-up.
• Temperature values below the set point (Temperature < STPM) cause compressor stoppage.
The on/off process of the compressors is controlled by a variable delay time.
Based on the time differential calculated as the delay, and in accordance with the temperature
detected by probe B6, this control will modulate the on/off process of the compressors.
If set to 0, minimum delay time at increase/decrease of the power demand, this function is disabled.
There is a different temperature differential for the cool/heat cycles (below or above...), as of which
there is an unconditional off of the devices installed to avoid excessive cool/heat cycles.
C1 C2 C3 C4
C4 C3 C2 C1
RBM
STPM
STPM
EIWT (Cº)
EIWT (Cº)
RBM
A
B
1User manual
1.1 General description of the unit
18