Daikin DCG Series Service Instructions Manual

Also see for DCC Series: Installation instructions Installation instructions Installation instructions Installation instructions Installation instructions

Contents

SERVICING481. Set the thermostat to the fan "on" position.2. Check for 24 volts at the C and G terminals of the EBTDR.3. If no voltage present, check fan circuit from thermostat.If 24 volts present, proceed to step 4.4. Using a VOM, check for line voltage from the purple wireat the transformer (terminal 3 on 240 volt units, terminal2 on 208 volt units) to terminal NO on the EBTDR. Shouldread line voltage. If no voltage present, check line voltagewiring in unit. If line voltage present, proceed to step 5.5. Using a VOM, check for line voltage from the purple wireat the transformer (terminal 3 on 240 volt units, terminal2 on 208 volt units) to the COM terminal on the EBTDR.Should read line voltage. If not as above, replace EBTDR.PSC equipped, single phase model coolers and heat pumpshave an isolation relay with a 240 volt holding coil in additionto the EBTDR.WARNINGDisconnect ALL power before servicing.Turn power off.Testing relay holding coil1. Remove the leads from the holding coil terminals 1 and3.2. Using an ohmmeter, test across the coil terminals 1 and3. If the coil does not test continuous, replace the relay.Testing relay contactsWARNINGDisconnect ALL power before servicing.Turn power off.1. Using a VOM, test resistance across relay terminals 2and 4. Should read open.2. Turn power on.3. Apply 240 volts to coil terminals 1 and 3.4. Using a VOM, check for 240 volts from terminals 3 and1 of relay. Should read 240 volts. In no voltage, checkwiring from heater kit to relay. If voltage present, proceedto step 5.B. T1-T2, T1-T3, and T2-T3 - If voltage readings are notthe same as in "A", replace contactor.VOLT/OHMMETERCCOhmmeter for testing holding coilVoltmeter for testing contactsT1L1T3L3T2L2TESTING COMPRESSOR CONTACTOR(ThreePhase)S-9 CHECKING FAN RELAY CONTACTSDCG:The fan relays are incorporated into the control board. Seesection S-313 for checking control board for single phasegas models.For 3 phase and belt drive models, the procedure for testingthe fan relay contacts will be the same as checking thecompressor contactor contacts (See section S-8).DCC/DCH:The Electronic Blower Time Delay Relay is used on PSC andbelt driven models.HIGH VOLTAGE!Disconnect ALL power before servicingor installing this unit. Multiple powersources may be present. Failure to do somay cause property damage, personal injuryor death.Checking EBTDR High Voltage Contacts1. With power off, remove wires from terminals NC, COM,and NO.2. Using a VOM, check for resistance from NO to COM.Should read open. Next, check for resistance from NC toCOM. Should read closed.3. If not as above, replace EBTDR.Checking EBTDR Contact OperationWith power on: