Daikin Enfinity Installation And Maintenance Manual

Daikin Enfinity Installation And Maintenance Manual Manual pdf 28 page image

C ontrolswww.DaikinApplied.com 28 LARGE VERTICAL WSHP IM 1059-12Supplemental electric heat controlThe supplemental electric heating option providesadditional stages of heating that can be used inconjunction with compressor heating, or exclusively if thecompressor is not available for heating.General rules• Supplemental electric heater and the compressormay operate simultaneously.• Minimum compressor ON and OFF timers do notapply to electric heat control.OperationFan main output: will turn ON when:• Any auxiliary heat output is energized.• For 30 fixed seconds after all auxiliary heat outputshave been de-activated.Electric heat outputs: are allowed to energize wheneither condition exists:• Inter-stage ON timer must be expired.• Compressor is not available for heating.When compressor is available• Auxiliary heat stage #1 output energizes upon activationof heating – stage #3.• Auxiliary heat stage #2 output energizes upon activationof heating – stage #4.When compressor is unavailable• Auxiliary heat stage #1 output energizes upon activationof heating – stage #1.• Auxiliary heat stage #2 output energizes upon activationof heating – stage #3.■ Boilerless heat control –Turns on the heater when theentering water temperature is less than setpoint (defaultis 55°F), the temperature set point is adjustable throughthe network.For geothermal applications the heater turns on whenthe entering water temperature is less than setpoint(default 28°F).Note: In both cases the compressor is shut down.■ Short cycle protection & random start – After powercycle or deactivation of certain alarms, or when leavingthe unoccupied mode, a new random compressor start-delay time between 300 and 360 seconds is generated.The random start timer prevents compressors indifferent units from starting simultaneously. Compressorminimum OFF 360 sec) and compressor minimum ON(180 sec) timers prevent compressor short cycling.■ Unoccupied mode – A simple “grounded” signalbetween terminals U and C (no power source required),puts the unit into the unoccupied mode for night setbackoperation.■ Inter-staging timer – A default value of 5 minutesbetween staging of compressors, this feature minimizesshort cycling of compressors and improves comfort.■ Override mode – A switch on the deluxe automaticchangeover thermostat can be activated during theunoccupied mode to put the unit back into the occupiedmode for two hours for after-hours heating or cooling.■ Motorized valve/pump restart – The IV/PR (H8)terminals on the The MicroTech III unit controller areused to energize (open) a motorized valve or start awater pump to get water circulating prior to startingthe compressor on call for heating or cooling. Leadcompressor operation shall be delayed a minimum of 45seconds, after the motorized valve/isolation valve outputenergizes to allow for supply water flow.■ Brownout protection – The MicroTech III unitcontroller measures the input voltage and will suspendcompressor and fan operation if the voltage falls below80% of the unit nameplate rated value. Two externalLED status are generated and an output is available toa "fault" LED at the thermostat.■ Emergency unit shutdown – A simple groundedsignal puts the unit into the shutdown mode. Remoteshutdown is provided so that when properly connectedto a water loop controller or remote switch, theemergency shutdown input can be used to shutdown the water source heat pump. Compressor andfan operations are suspended, and an a unique twoexternal LED status is generated.■ Condensate overflow protection (cooling &dehumidification modes only) – The MicroTech IIIunit controller incorporates a liquid sensor at the top ofthe drain pan. When the unit senses a high condensatewater level for 60 consecutive seconds while in thecooling or dehumidification modes the unit entersthe "Off Alarm" machine state. The dehumidificationor cooling mode operation will immediately be de-energized as well as the pump output.