Canatal M52 User manual

Canatal M52 Microprocessor
User’s Guide
Canatal International Inc.
M52UMCT Oct-03 6300 Edwards Blvd., Mississauga, Ontario, Canada L5T 2V7
CANATAL
Intelligent Precision Air Conditioning

M52 Microprocessor User's Guide
M52UMCT Oct-032

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Table of Contents
Sequence of Operation ..................................................................................................................................................... 6
Phase Loss (OPTION):.................................................................................................. 6
Analogue and digital outputs for functions ................................................................... 6
DX Demand (Cooling)................................................................................................... 6
Chilled Water................................................................................................................. 7
DX Demand (Dehumidification): .................................................................................. 7
Rapid Dehumidification Feature (All except China units) ............................................ 7
Dual Cooling Units: Series 9 only................................................................................. 8
Free Cooling Units: Series 9 only ................................................................................. 8
Reheat:........................................................................................................................... 9
Humidifier: .................................................................................................................... 9
PID .............................................................................................................................. 10
Internal Safety Controls............................................................................................... 10
External Optional Safety controls ............................................................................... 10
On/Off Control............................................................................................................. 10
Back up Capability ...................................................................................................... 10
Note: On/Off mode: ..................................................................................................... 10
Powering Up / Powering Down...................................................................................................................................... 12
The Control Panel........................................................................................................................................................... 13
Banner line .................................................................................................................. 13
Active tab display area ................................................................................................ 13
Tab bar ........................................................................................................................ 13
Operating Status............................................................................................................................................................. 14
Main Return Air Temperature & Humidity Readout ................................................... 14
Process status Display................................................................................................. 14
Network Address.......................................................................................................... 14
Alarm Icon................................................................................................................... 14
Unit fan On/Off Icon.................................................................................................... 15
On/Off Mode Icon........................................................................................................ 15
Co-Work™ Address Icon............................................................................................. 16
Security............................................................................................................................................................................ 17
Log-in Security............................................................................................................ 17
Log-out Security.......................................................................................................... 18
Change Password ....................................................................................................... 18
Alarms ............................................................................................................................................................................. 20
Review Active Alarm Queue........................................................................................ 20
Acknowledging Alarm................................................................................................. 21
Clear Alarm Message.................................................................................................. 21

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Alarm Configuration ...................................................................................................22
Alarm Response Summary ...........................................................................................24
Historical Event Log .......................................................................................................................................................25
Timer On/Off Schedule...................................................................................................................................................26
Review Timer On/Off Schedule....................................................................................26
Programming the Timer On/Off Schedule...................................................................27
Set Clock......................................................................................................................27
Temperature and Humidity Log Graph........................................................................................................................28
Settings .............................................................................................................................................................................29
Programming Settings.................................................................................................29
Settings Summary ........................................................................................................30
Settings Summary Glossary .........................................................................................31
Test Mode ........................................................................................................................................................................34
Microprocessor board Diagnostic...............................................................................34
Digital I/O board Diagnostic ......................................................................................36
Test Mode Unit on/off..................................................................................................36
Sensor Calibration.......................................................................................................37
Sensor Calibration Sequence.......................................................................................38
Temperature .................................................................................................................38
Relative Humidity ........................................................................................................38
Data Re-initialization ..................................................................................................38
Co-Work™........................................................................................................................................................................40
Settings Menu, Sensor mode:.......................................................................................41
Fault Finding ...................................................................................................................................................................43
High Temperature Alarm.............................................................................................43
Low Temperature Alarm..............................................................................................43
High Humidity Alarm ..................................................................................................44
Low Humidity Alarm ...................................................................................................44
High Voltage Alarm.....................................................................................................45
High Voltage Alarm.....................................................................................................45
Low Airflow Alarm ......................................................................................................46
Filter Dirty Alarm........................................................................................................46

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Fan Overload Alarm................................................................................................... 47
Heater Overheat Alarm............................................................................................... 47
Boiler Dirty Alarm ...................................................................................................... 48
High Pressure Alarm .................................................................................................. 49
Low Pressure or Short Cycling Alarm ........................................................................ 50
Appendix A: Electrical Schematic Diagrams ............................................................................................................... 51

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M52UMCT Oct-036
Sequence of Operation
The following is an outline of the operation of the unit. Not all units have all options.
1. Unit powered
2. Canatal Banner appears and controller beeps three times.
3. Microprocessor initializes Co-Work and runs self check.
4. Random start timer activates
5. Restart delay counts down
Phase Loss (OPTION):
On loss or cross of a phase of supply power the unit will shut down or display Phase
Loss alarm. You must acknowledge the alarm and correct the phase before the unit will
restart.
6. Blower starts (Blower runs continuously) when unit is in the ON position and when
Restart mode is set to Auto.
7. Warm-up period begins to allow time for steady signal from sensors. Temp/Hum
readings flash on screen during warm-up.
8. DX systems, crankcase heaters are energized when compressor is OFF through auxiliary
N/C contact on compressor contactor.
9. Air cooled DX units with flooded condenser Low Ambient Control (LAC) N/C
auxiliary contact on compressor contactor energizes receiver heaters.
Analogue and digital outputs for functions
Cooling 0-10 vdc and 1 or 2 triac outputs
Heating 0-10 vdc and 1, 2 and/or 3 triac outputs
Humidifying 0-10 vdc and 1 triac output
Dehumidifying 0-10 vdc and 1 or 2 triac outputs
DX Demand (Cooling)
Cycles on compressors in stages 1 to 8 depending on number of units connected together with Co-
Work as demand for cooling increases from 0 to 100%. The compressor will continue to run for a
minimum time of 1-5 minutes (default is 1 minute) to allow oil return to the compressor.
Demand for compressor:
•Compressor contactor and liquid line solenoid receives signal from microprocessor. Positive
Start timer (Pos. start delay) starts and bypasses LP switch for cold start-up. When HP switch
is closed the start circuit is complete and the compressor starts.
•N/C auxiliary contact on compressor contactor opens and de-energises receiver heaters.
(Flooded Condenser LAC)

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•N/C auxiliary contact on compressor contactor opens and de-energizes crankcase heater.
•N/O auxiliary contact on compressor contactor starts remote condenser. (Air-cooled units only)
•Low-pressure switch remains closed after Pos. start time expires and compressor remains on.
Compressor stops when:
•Loss of demand
Compressor contactor opens
•Low pressure condition
Compressor stops when LP SW. opens. (Automatic reset) compressor contactor opens.
•Short cycling alarm
After three consecutive low-pressure alarms in 30 mins, compressor contactor opens. Manual
reset is required.
•High pressure condition
Compressor stops when HP SW. opens. (Manual reset)
Compressor contactor opens. Compressor will not start until HP SW. and controller are reset.
•Thermal protection opens (automatic reset)
Line voltage cut-outs on all compressors except Spectre compressor where the compressor
module causes a Compressor Overload alarm and stops the compressor through the
microprocessor. Compressor module resets after 30 minutes.
Note: Anytime the contactor opens the comp. elapse timer keeps compressor off for 3 minutes
(adjustable)
Chilled Water
On demand for cooling or dehumidification chilled water valve opens as demand signal ramps up
from 0 to 100%. Valve operates on 0-10 Vdc.
Valve closes when:
Loss of demand, signal diminishes to 0 Vdc
DX Demand (Dehumidification):
Cycles on compressors in stages 1 to 4 or 8 depending on Series and number of units connected
together with Co-Work as demand for dehumidification increases from 0 to 100%. The compressor
will continue to run for a minimum time of 1-5 minutes (default is 1 minute) to allow oil return to
the compressor.
Demand for compressor:
•Compressor contactor receives signal from microprocessor. Positive Start timer (Pos. start
delay) starts and bypasses LP switch for cold winter start-up. When HP switch is closed the
start circuit is complete and the compressor starts.
•N/C auxiliary contact on compressor contactor opens and de-energises receiver heaters.
(Flooded Condenser LAC)
•N/C auxiliary contact on compressor contactor opens and de-energizes crankcase heater.
•N/O auxiliary contact on compressor contactor starts remote condenser. (Air-cooled units only)
•Low-pressure switch remains closed after Pos. start time expires and compressor remains on.
Rapid Dehumidification Feature (All except China units)
If there is less than 20 percent demand for cooling and a demand for dehumidification the Dehum.
Solenoid valve closes.

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The Dehum. Solenoid closes off refrigerant flow to part of the evaporator coil. This causes a
lower coil temperature. The coil begins to remove more moisture as a result. The air is
partially reheated, as the air through the inactive part of the evaporator is unconditioned.
This creates an overall drop in the sensible heat ratio (Rapid Dehumidification)
During dehumidification demand, some sensible cooling takes place. Under very low load
conditions, the sensible cooling effect maybe greater than the combined offsetting effect of
the heat load plus the available reheat capacity, which may cause a drop in room temperature.
If temp continues to drop and is less than (setpoint MINUS (temp dead band DIVIDED by 2)
MINUS heating proportional band) the compressors will stop overriding the demand for
Dehum. The temperature must return to set point before another cycle of dehumidification
starts.
ie: Low limit cutout =[
[[
[Set point – (temp deadband ÷
÷÷
÷2) – heating propband]
]]
]
Compressor stops when:
•Loss of demand
Compressor contactor opens
•Low pressure condition
Compressor stops when LP SW. opens. (Automatic reset) compressor contactor opens.
•Short cycling alarm
After three consecutive low-pressure alarms in 30 mins, compressor contactor opens.
Manual reset is required.
•High pressure condition
Compressor stops when HP SW. opens. (Manual reset)
Compressor contactor opens. Compressor will not start until HP SW. and controller are
reset.
•Thermal protection opens (automatic reset)
Line voltage cut-outs on all compressors except Spectre compressor where the
compressor module causes a Compressor Overload alarm and stops the compressor
through the microprocessor. Compressor module resets after 30 minutes.
•Low limit temperature
If return air temperature continues to drop and is less than (setpoint MINUS (temp dead
band DIVIDED by 2) MINUS heating proportional band) the compressors will stop
overriding the demand for Dehum.
Note: Anytime the compressor contactor opens the comp. elapse timer keeps compressor off
for 3 minutes (adjustable)
Dual Cooling Units: Series 9 only
Dual cooled units operate on DX as described above in DX Cooling Demand and DX
Dehumidification Demand. In DX mode the chilled water valve is closed. When a remote
signal contact input closes on both Chiller Ready Terminal 31 and 32 and Compressor
Disable Terminal 33 and 34 the compressors will stop and the unit will operate as described
in Chilled Water above.
Free Cooling Units: Series 9 only
Free cooling units operate on DX as described above in DX Cooling Demand and DX
Dehumidification Demand when the glycol loop temperature is above 7.2°C, (45°F). The
modulating glycol valve begins to open when the difference between the return air temperature

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(Temp 1) and the glycol loop temperature (temp 2) is greater than 5°C, (9°F). When the glycol
temperature drops below 7.2°C (45°F) the compressors will stop automatically. The glycol
temperature is monitored by the unit using Temp 2 input. Temp 1 and Temp 2 can be viewed in the
Test Mode section on page three.
Note: The Status screen on the controller indicates free cooling is on when it displays 2/2 and off
when it displays 0/2 under the percentage demand next to the Free Cooling icon.
Reheat:
On demand for heat the demand signal ramps up and heater contactor closes at 100% demand, for
one stage or at 20% with SCR. SCR modulates from 20 to 100% output to match the demand
signal. On multi-stage heaters each stage will be energized at equal intervals as the demand
increases from 0 to 100%.
Heater stops when:
Loss of demand
Loss of air flow
Heater high temp cut out
Humidifier:
When the “On/Off/Drain “ switch is in the “On” position, a demand for humidification causes the
humidifier contactor(s) to close in stages 1 to 4 or 8, (depending on Series and number of units
connected together with Co-Work), as demand for humidification increases from 0 to 100%.
After a short time delay, approximately 1 to 3 minutes, the fill valve will energize allowing water to
fill the boiler bottle. The fill valve closes when the humidifier reaches its FLA current or when the
water level reaches the high water level sensor. Water begins to boil after a few minutes. The
humidifier will continue to boil and fill to maintain the humidity setpoint. Periodically the
humidifier will initiate a flush cycle to maintain constant steam output and to flush some of the
mineral content from the boiler bottle.
When the boiler bottle reaches the end of its useful life it will activate a Boiler Dirty Alarm and will
shut off the humidifier. It is common for the Boiler Dirty Alarm to sound on an initial start-up as the
humidifier begins the process of concentrating the mineral content of the contained water.
To drain the humidifier you must cause a humidification demand and then switch the “On/Off/
Drain” switch to Drain. You must set the switch back to “Off “when the bottle has completely
drained.
Humidifier stops when:
“On/Off/Drain” switch is switched "Off"
Loss of demand
Loss of air flow
Boiler Dirty Alarm intervention.

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PID
The M52 microprocessor uses PID control logic to maintain the set point conditions. The following
parameters are adjustable so the controller can be fine-tuned to specific site conditions.
Dead band, temp. humid. dead band
Cool prop. band
Heating prop. band
Humidifying prop. band
Dehum. prop. band
Integral time temp
Integral time hum.
Internal Safety Controls
Fuses (60 Hz), circuit breakers (50 Hz) on all components
Fan overload relay (Vertical floor mount, VFM systems only)
Air proving switch (Vertical floor mount, VFM systems only)
Dirty filter switch (Vertical floor mount, VFM systems only)
High pressure refrigerant (manual reset)
Low pressure refrigerant
Internal thermal protection compressor and motor
High temp cut out for heater
Boiler dirty for humidifier
Compressor elapse timer
Crank case heaters
External Optional Safety Controls
Fire stat terminals 19 and 20
Smoke detector terminals 19 and 20
Liquid detector J51-01 02 and 03
On/Off Control
Local Mode:
When the controller is set to Local Mode, On/Off control of the unit is controlled by the keypad
Remote Mode:
When the controller is set to Remote, On/Off control is controlled by a remote signal through
terminals 15 and 16.
Timer Mode:
When the controller is set to Timer, On/Off control follows the time schedule programmed on the
controller. Unit can be set to be On, Off or Relax. Relax mode cause the microprocessor to control
using the RELAX deadbands which are programmable. In this mode the fan continues to operate.
Back up Capability
Standby Enable:
Each unit sends an output to start a back up unit in the event of an alarm condition as configured in
the Alarm Response menu. Terminals 17 and 18
Standby Start:
Each unit accepts an input signal to start regardless of its On/Off mode state at terminals 11 and 12
Note: On/Off mode:
When operating in a Co-Work network all On/Off mode options are synchronized. Therefore, turning
off a unit, either by the touch screen when in Local, by the remote on/off at terminals 15 and 16 when
in Remote, or through the schedule when in Timer mode will turn off all units in that network.