McQuay M4AC040A, Руководство по установке и обслуживанию

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Microprocessor (For Carel Controller Only)
Compact µchiller is a versatile electronic controller as compact as a standard thermostat.
M4AC040AE/ARE, M4AC050AE/ARE, M4AC058AE/ARE, M4AC075BE/BRE,
M4AC100BE/BRE, M4AC125BE/BRE Only
Main Functions
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Control of water temperature at evaporator inlet (inlet water)
x
Time-based and/or temperature-based defrosting cycles
x
Control of fan speed
x
Full alarm management
x
Can be linked up to serial line for supervisory telemaintenance control
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Can be linked up to an external terminal unit
Controlled Devices
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Compressor
x
Condensation fans
x
Reverse cycle valve
x
Water pump
x
Antifreeze heaters
x
Alarm signaling device
User Interface
Display - The display consists of 3 digits, with the automatic display of the decimal point between -19.9
and + 19.9°C; outside this measurement range, the value is automatically displayed without decimal
(although in its inside the machine is always operating by taking into account the decimal part). During
the normal operation, the displayed value corresponds to the temperature being read by the probe
B1, that is the evaporator water in-let temperature.
Status of the unit - The User is informed of the status of the unit by means of four LEDs on the
display.
Meaning of LEDs in single-compressor units
LED Flashing Steady
Comp Request for compressor Compressor actuated
Cooling - Cooling
Heating - Heating
X100 - Visualized value x 100
Alarms and Signaling
Any time an alarm condition is detected, the controller will prompt the following actions:
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the buzzer sounds
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the alarm relay energizes
x
the temperature value blinks on display
x
the alarm code appears on the LCD alternatively with the temperature value
After the alarms have been cleared either with automatic reset or by pressing the and buttons
simultaneously for 5 seconds (for alarms with manual reset), the controller will restore normal operating
conditions:
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the buzzer turns off
x
the alarm relay disenergizes
x
the temperature value blinks no longer
x
the alarm code disappears from the LCD
If the alarm condition persists, the actions described above will be performed again.
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