OPERATION AND MAINTENANCE MANUAL
Wall Mounted 0121…0661
12 (32)
Monobloc Wall Mounted Unit - WMA/WMF 0121-0181-0251-0281-0331-0551-0661 - Rev. 2.0. - Date: 18-07-2000 EN
FUNCTION AND REGULATION
MICROPROCESSOR CONTROL
(see mP20 microprocessor control instruction manual)
The control board provides the following functions:
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Control of room temperature
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Display of room relative humidity (with optional temperature and humidity sensor)
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Maximum room humidity setting which, when reached, closes the free-cooling damper and forces compressor
start-up (with optional humidity sensor)
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Management of electrical re-heat (optional)
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Management of alarms
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Management of stand-by if two or more units are connected (with LAN board)
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Alarm system with visual and acoustic signals
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Signal contacts for each type of alarm
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Programmable general alarm signal for the signalling of specific selectable alarms
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Programmable automatic re-start after a power failure
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Programmable re-start delay in multiple installations
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Compressor activation control (limits frequency of start-ups)
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Programmable control (remote control or supervision)
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Control of delivery air minimum temperature limit (WMF)
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Control of free-cooling damper position (special units)
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2 levels of password programming (setting / hardware & software configuration)
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RS422 or RS485 serial output (optional)
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Clock/calendar circuit (optional)
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Run hour counter for main components
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Service scheduling with clear information on necessary actions
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Memorisation of last 30 alarms (with date and time if optional clock circuit fitted)
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Detailed display of function mode and active components (with optional user terminal)
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Weekly on/off time bands (with optional clock circuit) for weekdays, pre-holidays, holidays
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Set-back function where the unit is in stand-by but maintains room temperature between two pre-set limits and
relative humidity below a pre-set limit (with optional temperature and humidity sensor).
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Distinct setting of heating and cooling set point
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Override function for the manual control of main components without excluding remote control.
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Optimised control algorithm which constantly monitors the temperature of the room, of the air outside and of the
delivery air for optimised management of both the direct expansion and the intelligent free cooling functions.
Free cooling can therefore start earlier and continue for longer and at higher external temperatures since it
takes into account the thermal load in the room at that moment.
•
Advanced free-cooling management of two units with stand-by function to maximise energy saving.
