Daikin EWAD TZ-B Operation Manual

Also see for EWAD TZ: Installation, operation and maintenance Installation, operation and maintenance manual

Contents

Daikin EWAD TZ-B Operation Manual Manual pdf 46 page image

Air and Water cooled inverter chillers and heat pumpD-EOMZC00105-17ENOperation Manual46/84EWAD TZ - EWAD TZ B -EWWD VZAir and Water cooled inverter chillers andheat pumpOverall Status Status DescriptionOff: Ready Circuit is off waiting for a stage up signal from thermostat controlStage Up Delay Circuit is off waiting for the stage up delay to expire.Cycle Timer Circuit is off waiting for the compressor cycle timer to expireBAS Disable Circuit is off by BAS signal. Check with the BAS company how to start the unit.Keypad Disable Circuit is off by the local or remote HMI. Check with your local maintenance if it can beenabled.Circuit Switch Circuit is off by Enable switch. Turn the Enable switch to 1 to allow the circuit start upprocedure to startOil Heating Circuit is off because the oil temperature is too low to guarantee a proper lubrication ofcompressor. Heating resistor is activated to eliminate this temporary condition. It’ssuggested to power up the unit in advance to avoid this limiting condition.Alarm A circuit alarm is active. Check the alarm list to see what is the active alarm inhibiting thecircuit to start and check if the alarm can be cleared. Refer to section 6.before proceeding.Test Mode Circuit mode set to Test. This mode is activated to check operability of onboard circuitactuators and sensors. Check with the local maintenance if the Mode can be reverted toEnable.Max Comp Starts Compressor starts exceed the maximum number of starts per hour.VFD Heating Inverter on compressor cannot start because of low internal temperature. Heating resistoris activated to eliminate this temporary condition. It’s suggested to power up the unit inadvance to avoid this limiting condition.Maintenance A component needs to be replaced or maintained. Refer to section 6.before proceeding.EXV Preopen EXV prepositioning before compressor starts.Run: Pumpdown Circuit is shutting down because of thermostat control or pumpdown alarm or because theenable switch has been turned to off.Normal Circuit is running within the expected operational conditions.Disch SH Low Discharge superheat is below the acceptable value. This is a temporary condition thatshould disappear after few minutes of operation.Evap Press Low Circuit is running with low evaporator pressure. This could be due to a transitory conditionor a lack of refrigerant. Check with the local maintenance if corrective actions are required.Circuit is protected by preventive logic.Cond Press High Circuit is running with high condenser pressure. This could be due to a transitory conditionor high ambient temperature or problems with the condenser fans. Check with the localmaintenance if corrective actions are required. Circuit will be protected by preventive logic.High LWT Limit Circuit is running with a high water temperature. This is a temporary condition that will limitthe maximum compressor capacity. Reduction of the water temperature will allow thecompressor to reach the full capacity.High VFD Amps Inverter current is higher than the maximum allowed current. Preventive logic will protect theinverter.5.2.5 Circuits start sequenceTo allow a circuit start up is required to enable the circuit using the enable switch located on the unit switchbox.Each circuit is equipped with a dedicated switch identified with Q1, Q2 (if available) or Q3 (if available). Theenable position is indicated with a 1 on the label whereas the 0 position corresponds to disable.The status of the circuit is indicated in the View/Set Circuit – Circuit #x – Status/Settings. The possible statuswill be described in the following table.If the circuit is allowed to start, the starting sequence is initiated. Starting sequence is described in a simplifiedversion with the further flowchart.