Lennox @DNOVA pCO1 User manual

lennoxemeia.com
@DNOVA
pCO1
Manuel
d’installation,
mise en service
et maintenance
Microprocesseur
INNOVA-pCO1-IOM-0907-F

INNOV@-pCO1-IOM-0907-E 1
Index
1GENERAL DESCRIPTION OF THE APPLICATION ...................................................3
1.1 Program main functions............................................................................................................... 3
1.2 LCD user interface...................................................................................................................... 3
1.3 LAN network connections............................................................................................................ 3
2REGULATION LOGIC .................................................................................................4
2.1 Temperature control.................................................................................................................... 4
2.1.1 Close control units with direct expansion coil........................................................................... 4
2.1.2 Other temperature functions.................................................................................................... 5
2.1.3 Close control units with two water coils.................................................................................... 5
2.1.4 Close control units with single water coil.................................................................................. 6
2.2 Humidity control.......................................................................................................................... 6
2.2.1 Close control units with direct expansion coil........................................................................... 7
2.2.2 Other humidity functions.......................................................................................................... 7
2.2.3 Close control units with water coils.......................................................................................... 8
2.3 Recovery coil .............................................................................................................................. 8
2.3.1 Recovery without cooling devices............................................................................................ 9
2.3.2 Recovery with cooling devices on close contr. units with direct expan. coil............................... 9
2.3.3 Recovery with cooling devices on close control units with water coils.................................... 10
2.4 Outlet limit.................................................................................................................................11
2.5 Condenser fans......................................................................................................................... 12
2.5.1 Single or separate coils......................................................................................................... 12
2.5.2 Condensing pressure probes ................................................................................................ 12
2.5.3 Prevent function.................................................................................................................... 13
2.5.4 Speed-up function................................................................................................................. 13
2.5.5 Pressure –temperature conversion....................................................................................... 13
2.6 Temperature set point compensation......................................................................................... 13
2.7 Compressors............................................................................................................................. 14
2.7.1 Rotation................................................................................................................................ 14
2.7.2 Timing................................................................................................................................... 14
2.7.3 Compressor alarms............................................................................................................... 14
2.8 Heaters..................................................................................................................................... 15
2.8.1 Heater alarms ....................................................................................................................... 15
2.9 Modulating valves ..................................................................................................................... 15
2.9.1 Three-position valves............................................................................................................ 15
2.9.2 0-10Volt VALVES.................................................................................................................. 16
2.10 Outlet fan.................................................................................................................................. 16
3THE USER INTERFACE ...........................................................................................17
3.1 Keyboard description................................................................................................................. 17
3.1.1 Switch ON/OFF of the unit..................................................................................................... 17
3.1.2 Screen loop........................................................................................................................... 17
3.2 Remote user interface............................................................................................................... 18
3.2.1 Without local display ............................................................................................................. 18
3.2.2 With local display.................................................................................................................. 18
4BOARD CONFIGURATION AND CONNECTION .....................................................19
4.1 Address configuration................................................................................................................ 19

2 INNOV@-pCO1-IOM-0907-E
4.1.1Address configuration of the microprocessor (pCO1)..........................................................................19
4.1.2 Address configuration of the PGD ......................................................................................... 19
4.1.3 Address configuration of the E2V electronic expansion valve’s driver (EVD).......................... 19
4.2 Boards connection .................................................................................................................... 20
4.2.1 Stand alone unit.................................................................................................................... 20
4.2.2 Units connected in LAN (max. 8 units)................................................................................... 20
4.2.3 LAN status............................................................................................................................ 21
4.3 Software update........................................................................................................................ 21
4.3.1 Program download from hardware key .................................................................................. 21
4.3.2 Program download from computer......................................................................................... 22
4.3.3 Restore the default parameters............................................................................................. 22
4.3.4 Language selection............................................................................................................... 23
5ALARMS....................................................................................................................23
5.1 Table of alarms ......................................................................................................................... 23
5.2 Alarm data logging .................................................................................................................... 24
5.3 Main log.................................................................................................................................... 24
6SCREENS.................................................................................................................26
6.1 List of the screens..................................................................................................................... 26
7LIST OF PARAMETERS AND DEFAULT VALUES...................................................28
8ARCHITECTURE OF THE CONTROL SYSTEM ......................................................34
8.1 Microprocessor layout ............................................................................................................... 34
8.2 Configuration list ....................................................................................................................... 35
8.3 Accessories............................................................................................................................... 35
8.3.1 Electronic expansion valve.................................................................................................... 35
8.3.2 Accessories .......................................................................................................................... 36
8.3.3 Built-in humidifier .................................................................................................................. 37
9SUPERVISION..........................................................................................................37
9.1 Supervisor and bms .................................................................................................................. 37
9.2 Gsm protocol............................................................................................................................. 39
9.3 Examples of installation............................................................................................................. 40
9.4 Shared external display............................................................................................................. 40
9.5 Automatic start and stand-by units............................................................................................. 41
9.5.1 Critical situations................................................................................................................... 41
9.5.2 Forcing.................................................................................................................................. 41
9.5.3 Fixed-hour rotation................................................................................................................ 42
9.5.4 Fixed-day rotation................................................................................................................. 42
9.5.5 Rotation based on working hours .......................................................................................... 42
9.6 Master control........................................................................................................................... 42
9.7 Technical data........................................................................................................................... 43

INNOV@-pCO1-IOM-0907-E 3
1 GENERAL DESCRIPTION OF THE APPLICATION
This program manages “DX” direct expansion or “CW” water coil air-conditioning units and the main features
of the application programare described below.
1.1 Program main functions
The program main functions are:
• control of temperature and humidity inside civil or technological environments
• management of 1 to 2 hermetic compressors
• management of 1 to 2heaters (binary logic available)
• 0-10Volt and three-position modulating heating valves
• 0-10Volt and three-position modulating cooling valves
• built-in humidifier with immersed electrodes
• on-off or modulated condensing fans, pressure-controlled
• outlet temperature control
• alarms management, alarm data logging, devices timing, warnings
• complete management of devices timing
• connection with local and BMS supervisory networks (Carel, Modbus, LonWorks, …)
1.2 LCD user interface
The LCD user interface displays the following data:
• measurement of connected probes and calibration, if required
• unit start and stop
• alarms detection
• programming of configuration and operative parameters with access protected by password
• controlled devices working hours and time bands with access protected by password
• programming of clock and time bands with access protected by password
• language selection among the available options (English, Italian, German, French)
1.3 LAN network connections
The connection with LAN network allows the programto manage the following functions as well:
• automatic time or event rotation among up to 8 units
• control of temperature and humidity of max. 8 units, taking the probes of unit no. 1 as a reference
• use of only one LCD display for controlling up to 8 units

4 INNOV@-pCO1-IOM-0907-E
2 REGULATION LOGIC
2.1 Temperature control
The heating and cooling devices are managed based on the temperature value measured by the ambient (or
room temperature) probe. The measured temperature is compared to the set temperature (set point); the
devices are enabled based on the difference between the two values. The proportional band identifies the
air-conditioning unit working range and can take different values in heating and cooling mode. The dead
zone identifies the devices non-action zone round the set point. The following diagrams show the action of
the heating and cooling devices. The percentage values indicate the modulating valves opening range. The
warm and cold valves start and end opening parameters correspond to 0% and 100% respectively (default
values) and are different for the two valves; if need be, the values may be modified to delay opening start
and bring complete opening forward.
2.1.1 Close control units with direct expansion coil
Temperature set
HEATING COOLING
100% 0% 0% 100%
19.5 22.5 23.0 23.5 26.5
3°C 0.5°C 0.5°C 3°C Ambient
temp. (°C)
Warm proportional band Dead z. Deadz. Coldproportional band
1 HEATER 1 COMPRESSOR
19.5 22.5 23.0 23.5 26.5
Ambient
temp. (°C)
COMP.2/
HEATER 1 HEATER 2 COMP.1 C1 capacity control
19.5 21.5 22.5 23.0 23.5 25.0 26.5
Ambient
temp. (°C)
BINARY MANAGEMENT
HEATER 3 HEATER 2 HEATER 1 COMP.1 C1 c.c. COMP.2 C2 c.c.
19.5 20.5 21.5 22.5 23.0 23.5 24.2 25.0 25.7 26.5 Ambient
temp. (°C)
0-10 Volt WARM WATER VALVE
100%
0%
19.5 22.5 23.0 Ambient
temp. (°C)
Opening start point (0%)
Opening end point (100%)
100%
0%
19.5 22.5 23.0 Ambient
temp. (°C)
Three-position valve running time

INNOV@-pCO1-IOM-0907-E 5
2.1.2 Other temperature functions
The high and low temperature alarms cause alarm screen signalling and have modifiable delay time.
The dehumidification stop differential establishes the minimum temperature below which dehumidification is
interrupted. Dehumidification can start again if temperature returns above the value established by the
humidification start offset; differential and offset are modifiable.
ON OFF Temperature set
Dehumidification stop
HEAT. COOL.
13.0 18.0 20.0 22.0 23.0 26.0 33.0 Ambient
3°C 3°C temp. (°C)
Warm band Cold band
4°C
Dehumid. start offset
5°C
Dehumid. stop different.
10°C 10°C
Low temperature alarm High temperature alarm
2.1.3 Close control units with two water coils
These close control units are equipped with a warm water coil and a cold water coil. In addition, heating can
also be executed by heaters. The following diagram shows the cooling devices action, whereas the heating
devices action is dealt with in the paragraph describing the direct expansion units.
Temperature set
HEATING COOLING
100% 0% 0% 100%
19.5 22.5 23.0 23.5 26.5
3°C 0.5°C 0.5°C 3°C Ambient
temp. (°C)
Warm proportional band Dead z. Deadz. Coldproportional band
0-10 Volt WARM WATER VALVE
100%
0%
23.0 23.5 26.5 Ambient
temp. (°C)
Opening start point (0%)
Opening end point (100%)
100%
THREE-POSITIONCOLD WATER
0%
23.0 23.5 26.5 Ambient
temp. (°C)
Three-position valve running time

6 INNOV@-pCO1-IOM-0907-E
2.1.4 Close control units with single water coil
In these close control units, the coil provides for both heating and cooling, depending on the type of water
circulating inside it. In practice, the unit works as it was equipped with two different coils. The coil operation
depends from a Summer / Winter digital contact that “reports” whether the circulating water is warm or cold
to the board; if the “type of water” circulating inside the coil complies with the ambient request, the valve is
modulated to regulate temperature.
In addition, heating can also be executed by heaters or a warm coil. For any information about coil and
heaters operation, refer to the previous paragraphs.
2.2 Humidity control
The humidification and dehumidification devices are managed based on the humidity value measured by the
ambient (or room temperature) probe. The measured humidity is compared to the set humidity (set point);
the devices are enabled based on the difference between the two values. The proportional band identifies
the air-conditioning unit working range and can take different values in humidification and dehumidification
mode. The 0.2% fixed dead zone identifies the devices non-action zone round the set point.
Dehumidification enables the available cooling devices and a contact for an external dehumidifier or for
reducing the outlet fan speed.
Dehumidification can be executed as follows:
On-Off contact for an external dehumidifier or for reducing the outlet fan speed
compressors enabling (active capacity controls included, if any)
100% enabling of the 0-10Volt or three-position modulating cooling valve
The dehumidification On-Off free contact is always managed, whereas the cooling devices depend on unit
configuration and User selection. The 0-10Volt modulating output of the dehumidification outlet fan is
automatically reduced by 50% (modifiable); with On-Off fan, use the digital contact for reducing speed.
The following diagrams show the humidification and dehumidification devices action. The percentage values
indicate the modulating valves opening range.

INNOV@-pCO1-IOM-0907-E 7
2.2.1 Close control units with direct expansion coil
Humidity set
HUMIDIFICATION DEHUMIDIFICATION
100% 0% 100%
48.0 50.0 52.0 Ambient
2.0% 2.0% humidity (%)
Humidification proportional band Dehumidification proportional band
1 COMPRESSOR
ON-OFF CONTACT + Capacity control, if any
48.0 50.0 52.0 Ambient
humidity (%)
0-10Volt MODULAT. OUTPUT
100%
COMP. 1 + COMP. 2 +
0% c.c., if any c.c., if any
48.0 50.0 51.0 52.0
Ambient
humidity (%)
100% INTEGRATED HUMIDIFIER
30%
48.0 49.8 50.0 Ambient
humidity (%)
2.2.2 Other humidity functions
Humidity set
100% 100%
48.0 50.0 52.0 Ambient
2.0% 2.0% humidity (%)
Humidification proportional band Dehumidification proportional band
100%
0-10V COLD WATER VALVE
0%
50.0 52.0 Ambient
humidity (%)
100%
THREE-P. COLD WATER VALVE
0%
50.0 52.0
Ambient
humidity (%)
The high and low humidity alarms cause alarm screen signalling and have modifiable delay time.

8 INNOV@-pCO1-IOM-0907-E
2.2.3 Close control units with water coils
In these close control units, the cold water coils provide for dehumidification. For any information about their
operation, refer to the previous paragraph. The following diagrams show the dehumidification devices action.
The percentage values indicate the modulating valves opening range. Please note that the dehumidification
cold water coils are enabled at 100%, not in modulating mode, in case of both threeposition and 0-10Volt
valves.
Humidity set
40.0 48.0 50.0 52.0 60.0 Ambient
2.0% 2.0% humidity (%)
Humid. band Dehumid. band
10.0% 10.0%
Low humidity alarm High humidity alarm
2.3 Recovery coil
Recovery is an optional function: an additional cold coil using water coming from an external source (i.e.,
evaporation tower) is enabled if the temperature of water running inside it is quite low. This allows saving on
the system management costs. The coil is enabled by On-Off contact or 0-10Volt modulating signal.
The following diagram shows the recovery coil enabling conditions: environment cooling request and
recovery water temperature lower than recovery set –recovery differential.
Temperature set
COOLING REQUEST
0%
23.0 23.5 26.5 Ambient
0.5°C 3°C temp.(°C)
Dead z. Cold prop. band
Recovery set
RECOVERY ENABLED
10.0 12.0 Recovery
2°C temp.(°C)
Recovery differential
OFF ON OFF
Recovery
coil state

INNOV@-pCO1-IOM-0907-E 9
2.3.1 Recovery without cooling devices
As shown in the previous diagram, the recovery coil only is enabled, whereas the conventional cooling
devices are not switched on; as it can be noted in the following diagram, the recovery coil takes up the entire
cold proportional band.
Temperature set
HEATING COOLING
100% 0% 0% 100%
19.5 22.5 23.0 23.5 26.5
3°C 0.5°C 0.5°C 3°C Ambient
temp. (°C)
Warm proportional band Dead z. Deadz. Coldproportional band
RECOVERY ON-OFF CONTACT
23.0 23.5 26.5 Ambient
temp. (°C)
0-10V RECOVERY VALVE 100%
0%
23.0 23.5 26.5 Ambient
temp. (°C)
2.3.2 Recovery with cooling devices on close contr. units with direct expan.
coil
With recovery coil enabled, the conventional cooling devices are switched on only if ambient temperature
increases above a certain value; adding the effects of recovery coil and devices together, temperature
decreases, but before reaching the set point, the cooling devices are switched off again. In this case, the
cooling devices favour Recovery but do not substitute for it. The following diagram shows how the cooling
devices steps are offset compared to normal position to ensure energy saving.

10 INNOV@-pCO1-IOM-0907-E
Temperature set
HEAT. COOLING
0% 0% 100%
22.5 23.0 23.5 26.5
0.5°C 0.5°C 3°C Ambient
Dead z. Dead z. Cold proportional band temp. (°C)
RECOVERY COIL ON
On-Off 1 COMPRESSOR
OFF 0-10Volt
23.0 23.5 24.6 24.9 26.5
Ambient
temp. (°C)
RECOVERY COIL ON
On-Off COMPR. 1 COMPR. 2/
OFF 0-10Volt C1 can control
23.0 23.5 24.6 24.9 25.6 26.5
Ambient
temp. (°C)
RECOVERY COIL ON
On-Off C.1 C.1 C.2 C.2
OFF 0-10Volt c.c. c.c.
23.0 23.5 24.6 24.9 25.1 25.6 26.1 26.5
Ambient
temp. (°C)
2.3.3 Recovery with cooling devices on close control units with water coils
The following diagram shows how the cold coil steps are offset compared to normal position to ensure
energy saving.
Temperature set
HEAT. COOLING
0% 0% 100%
22.5 23.0 23.5 26.5
0.5°C 0.5°C 3°C Ambient
Dead z. Dead z. Cold proportional band temp. (°C)
RECOVERY COIL ON 0-10V MOD. WARM VALVE
On-Off
OFF 0-10Volt
23.0 23.5 24.6 24.9 26.5
Ambient
temp. (°C)
RECOVERY COIL ON THREE-P- WARM VALVE
On-Off
OFF 0-10Volt
23.0 23.5 24.6 24.9 26.5
Ambient
temp. (°C)

INNOV@-pCO1-IOM-0907-E 11
2.4 Outlet limit
This function prevents too cold air from circulating in the environment, thus safeguarding health of any
exposed person. A temperature probe must be positioned on the air-conditioning unit outlet and parameters
“Outlet set point” and “Outlet differential” shall be set. Such parameters identify a limiting zone, as shown in
the following diagram:
Outletset
100% VARIABLE LIMITATION
TOTAL
LIMITATION 0%
10.0 15.0
5.0°C Ambient
Outlet differential temp.(°C)
Temperature set
1 COMPRESSOR
23.0 23.5 26.5
Ambient
temp. (°C)
COMPRESSOR 1 COMPRESSOR 2/
C1 can control
23.0 23.5 25.026.5
Ambient
temp. (°C)
COMP.1 C.1 c.c. COMP.2 C.1 c.c.
23.0 23.5 24.225.025.726.5
Ambient
temp. (°C)
0-10V COLD WATER VALVE
100%
0%
23.0 23.5 26.5
Ambient
temp. (°C)
THREE-POINT COLD WATER VALVE
100%
0%
23.0 23.5 26.5
Ambient
temp. (°C)
As shown in the diagram, if outlet temperature ranges between outlet set point and outlet differential, the
cooling devices are limited only partially; the more temperature decreases the more limitation increases.
As regards dehumidification limitation, the modulation zone is by-passed since dehumidification always
needs the cooling devices maximum capacity. In practice, the devices are switched off only if outlet
temperature is lower than differential; the devices are then switched on again if outlet temperature reaches
the outlet set point, as shown in the following diagram:
Outletset
ON OUTLET LIMITATION
TOTAL
LIMITATION OFF LIMITATION OFF
10.0 15.0
5.0°C Outlet
Outlet differential temp. (°C)

12 INNOV@-pCO1-IOM-0907-E
2.5 Condenser fans
Condensing pressure control is available on DXtype units, in which fans are managed based on condensing
coil pressure and compressors state. Fans are enabled by 0-10V modulating or digital outputs.Control is
based on the condensation set point and differential, as shown in the following diagram:
Condensation set
CONDENSATION HP PREVENT HP
14.0 16.0 18.0 20.0 23.5 24.5
2.0 bar 2.0 bar 1.0 bar Condensation
Condensation differential Prevent differential HP differential pressure (bar)
ON
OFF
Compressor
state
ON
OFF
Condensing
fans state
The following diagram shows fans operation with modulating outputs:
100%
13.0 0% 14.0 16.0
2.0bar Condensation
Opening start point (100%) pressure (bar)
Opening end point (0%)
The maximum and minimum speeds of 0-10V outputs can be set; in case the set minimum speed is higher
than 0V, the fan is operated at minimum speed 1.0 bar below the condensation set point before switching off,
as indicated in the diagramabove.
2.5.1 Single or separate coils
In case of single coil, only one output (on-off or modulating) is enabled. In case of units with at least one
condensing probe and enabled on-off outputs,two on-off outputs may be enabled in sequence, dividing the
differential by two.
In case of separated coils, two different outputs (on-off or modulating) are enabled, one per circuit.
2.5.2 Condensing pressure probes
Foreword: besides the values read by the probes, fans enabling always considers the compressors state.
In case of single probe and separated coils, fans enabling is based on the probe value for both circuits.
In case of two probes and single coil, fans enabling is based on the highest probes value.
In case of two probes and separatedcoils, fans enabling is based on the probe value of the relevant circuit.

INNOV@-pCO1-IOM-0907-E 13
In case no probe is present, fans are enabled simultaneously with the compressors; in case of single coil,
fans are enabled when at least one compressor is on; in case of separated coils, each compressor controls
the fans of its own circuit.
2.5.3 Prevent function
High pressure alarm prevention with compressors stopped. Normally, the condensing fans turn on only if
compressors are enabled, but in this case they are forced so as to decrease pressure and try to prevent the
high pressure alarm, which would cause unit shutdown. Pressure increase with compressors stopped may
be due to radiance on the coil. In case of 0-10V modulating fans, modulation is by-passed.
2.5.4 Speed-up function
To overcome inertia at high-power modulating fans peak, they may be started at maximum speed for some
seconds, then speed decreases to the required value and modulation starts.
2.5.5 Pressure –temperature conversion
Both pressure and temperature probes can be selected. In case of pressure probes, branch I/O screens
display the temperature value corresponding to the pressure of each probe, based on the coolant type (to be
selected in the Manufacturer branch).
2.6 Temperature set point compensation
The temperature set point can be “compensated” automatically for comfort reasons; for example, think about
a commercial concern in which people frequently enter and go out: if internal temperature is 10°C lower than
the external one, the thermal rush may annoy people and could be prejudicial to their health. The maximum
difference between internal and external temperatures should not exceed 6°C in order to obtain optimum
comfort. In this case, the compensation function increases the set point by 4°C, consequently increasing the
ambient temperature; this function prevents the difference between internal and external temperature from
exceeding 6°C.
Compensation requires a temperature probe to be installed at the exterior. The function is managed based
on the values of compensation set point, differential and offset parameters, as shown in the following
diagram:
Compensation set
2°C Compensation
offset
25.0 28.0
3°C External
Compensation proportional band temp. (°C)
25.0°C
23.0°C
Temperature
set-point (°C)

14 INNOV@-pCO1-IOM-0907-E
2.7 Compressors
Compressors are managed in ON-OFF mode. Maximum 2 compressors can be present.
2.7.1 Rotation
Compressors rotation follows the F.I.F.O. (first in, first out) logic. The first compressor turned on is the first to
turn off, the first compressor turned off is the last to turn on. This logic allows comparing the compressors
working hours and obtaining the same ageing. The rotation can be disabled.
2.7.2 Timing
START MINIMUM TIME
It represents the compressors start minimum time (in seconds) after they have been enabled. If a stop
request arises, compressors are disabled only afterthe established time has elapsed.
STOP MINIMUM TIME
It represents the compressors stop minimum time (in seconds) after they have been disabled. If a start
request arises, compressors are enabled only after the established time has elapsed.
MINIMUM TIME BETWEEN DIFFERENT COMPRESSORS STARTS
It represents the minimum time interval (in seconds) between start of a device and the following one. This
interval allows preventing contemporary peaks, which would cause a high energy absorption.
MINIMUM TIME BETWEEN COMPRESSOR STARTS
It represents the minimum time interval (in seconds) between two starts of the same device. This parameter
allows limiting the number of starts per hour. If, for example, the maximum number of starts per hour allowed
by the default values is 10, this limit can be respected by setting a 360-second time interval.
2.7.3 Compressor alarms
Compressors alarms are distributed in two digital inputs, the alarms mean Thermal alarm / High and Low
pressure alarm.
HIGH PRESSURE –THERMAL ALARM
Immediate alarm originated by external pressure switch or compressor overload; the digital input switches
fromclosed to open and compressor is immediately stopped. To start the compressor again, the user has to
rearm the alarm manually by pushing the display Alarm button, provided that the pressure switch or
compressoroverload have rearmed energising the digital input. After the compressor has turned off, timing is
enabled; for this reason, after alarmrearming, the compressor could not immediately turn on again.
LOW PRESSURE ALARM
Delayed alarm originated by an external pressure switch. When opening, the digital input enables two timers;
if, when the timers delay time (programmable by screen) elapses, the contact is open, the compressor turns
off and the alarm goes off. On the contrary, if the contact closes before delay time elapses, the alarm does
not go off and timers reset. Timers are: running compressor delay time and compressor start delay time.
Running delay is always counted, whereas compressor start delay is counted only if the input opens
immediately after compressor start and allows for fluid stabilisation. The two timers are counted in sequence.

INNOV@-pCO1-IOM-0907-E 15
To start the compressor again, the user has to rearm the alarm manually by pushing the display Alarm
button, provided that the pressure switch has rearmed energising the digital input. After the compressor has
turned off, timing is enabled; for this reason, after alarmrearming, the compressor could not immediately turn
on again.
GENERIC ALARM
Alarm including all compressor safety devices in a single digital input, used on two-compressor small boards.
This alarm goes off immediately when opening the digital input and locks the compressor. To start the
compressor again, the user has to rearm the alarm manually by pushing the display Alarmbutton, provided
that the digital input has been energised. After the compressor has turned off, timing is enabled; for this
reason, after alarm rearming, the compressor could not immediately turn on again.
2.8 Heaters
The heaters are managed as simple ON-OFF loads. Normally up to 2 heaters with the same power can be
managed, connected to the 2 outputs.
“Binary management” allows the use of three heating steps with just two outputs and 2 loads with different
power values:
The outputs with binary logic behave as follows:
2 DIFFERENT LOADS
STEP 1 Heat.1 = On / Heat.2 = Off
STEP 2 Heat.1 = Off / Heat.2 = On
STEP 3 Heat.1 = On / Heat.2 = On
The outputs are activated with a slight delay from one to the other, to avoid simultaneous peaks.
2.8.1 Heater alarms
Each heater is provided with a digital input to be connected with a compressor overload or differential for
signalling any failure.
Immediate alarm originated when the digital input switches from closed to open; the heater is immediately
disabled. To enable the heaters again, the user has to rearm the alarm manually by pushing the display
Alarm button, provided that the compressor overload or the differential have rearmed energising the digital
input.
2.9 Modulating valves
2.9.1 Three-position valves
Valves with three electrical contacts (besides supply): shared, opening and closing.
Based on the relays enabling time, the valves opening range varies from 0% to 100% taking an
opening/closing time defined as “running time” (time taken to open or close completely; it is a valves rating).
The relays must never be enabled simultaneously, thus the valve open, close or keep still.
The valves opening range is calculated based on the proportion between temperature differential and
running time. When ambient temperature corresponds to the set point, the valves keep closed; the more
temperature is offset compared to the set point the more the valves are opened, until they open completely
when temperature is equal or higher than set point + / -differential.
During operation, the valves are frequently subject to partial opening and closing; the program can recognise
the valves opening range at any time by adding up and subtracting all partial times executed from board
start-up.

16 INNOV@-pCO1-IOM-0907-E
REALIGNMENT
As there is no feedback to define precisely the valves opening range, the program cannot easily manage the
three-position valves. A slight difference between the time calculated by the program and the relays enabling
time or a mechanical friction preventing the valves from moving freely may originate discrepancy between
the valves actual opening range and the range calculated by the program. To obviate this problem, the
following precautions are provided for:
whenever temperature control requires a valve complete opening or closing, the program increases
the opening or closing relay enabling time by 25% to ensure complete opening/closing.
whenever the board is started, the valves are completely closed during the running time; only after
time has elapsed, the valves start modulating their opening range based on the control request.
2.9.2 0-10Volt VALVES
These valves use a 0-10Volt modulating signal coming from the microprocessor to modify their opening
range from 0% to 100%.
The 0-10Volt electric signal is directly proportional to the temperature proportional band. Unlike the three-
position valves, these valves do not require adjustment since their opening range is directly proportional to
the analogue output value.
2.10 Outlet fan
With unit enabled, the outlet fan keeps switched on. It can be managed with On–Off or modulating output.
The fan is provided with a thermal alarmand an air flow controller alarm, which lock the unit setting it to OFF
state; thermal alarm requires manual rearm, whereas air flow controller alarm is rearmed automatically.
Description of modulating management:
Temperature set
HEATING COOLING
100% 0% 0% 100%
19.5 22.5 23.0 23.5 26.5
3°C 0.5°C 0.5°C 3°C
Warm proportional band Cold proportional band
100% 100%
50%
Min speed (5.0V) Fan speed
Maxspeed (10.0V)

INNOV@-pCO1-IOM-0907-E 17
3 THE USER INTERFACE
The provided user interface PGD is equipped with a LCD display (4 rows x 20 columns). and with 6 keys. It
allowscarrying out all program operations. The user interface allows displaying the unit working conditions at
any time and modifying the parameters; furthermore, it may also be disconnected fromthe main board, as its
presence is not strictly necessary.
3.1 Keyboard description
The PGD user interface has 6 keys and their use is describe in the following table.
Keys Description
ALARM key Press ALARM key to enter the alarm menu and to reset the alarms. When an alarm
is present the button is illuminated.
PROGRAM key Press PROGRAM key to enter the main menu where is possible to select the items:
MAINTENANCE, PRINTER, INPUT/OUTPUT, CLOCK, SETPOINT, USER,
MANUFACTURER
ESC key Press ESC key to go out from a menu and come back into the main screen.
UP key Press UP key to move into the next screen or to increment the value of a
parameter.
ENTER key Press ENTERkey to move into the next modifiable parameter field and confirm the
modification
DOWN key Press DOWN key to move into the previous screen or to decrement the value of a
parameter.
PROGRAM + ESC keys Press simultaneously PROGRAM and ESC keys to enter directly the
MANUFACTURER menu.
ESC + ENTER keys Press simultaneously for 5 seconds, ESC and ENTER keys to enter into the screen
where you can press ENTER to switch ON/OFF the unit
3.1.1 Switch ON/OFF of the unit
The unit is switch On/Off by pressing Esc + Enter keys simultaneously for 5 seconds; after, the displayed
screen allows executing the required operation by using Enter key.
3.1.2 Screen loop
Press PROGRAM key to display the main menu; then, by using the arrow buttons, move the cursor on the
selected item and press Enter to access it.

18 INNOV@-pCO1-IOM-0907-E
3.2 Remote user interface
3.2.1 Without local display
3.2.2 With local display
Remote display
wall mountedMicroprocessor pCO1
Unit
Remote display cable:
6 wires, with RJ11
connectors.
NOTE:
the cable is different from
the standard telephone
cable because in the
remote display cable the
connectors are reversed.
Local display
panel mounted
Remote display
wall mounted
Microprocessor pCO1
Unit
Derivator TCONN
(it is necessary only if local
and remote displays are
simultaneously present)
Remote display cable:
6 wires, with RJ11
connectors.
NOTE:
the cable is different from
the standard telephone
cable because in the
remote display cable the
connectors are reversed.