Checking Fan Relay Contacts; Mbr/Ar*F Electronic Blower Time Delay Relay - Daikin DAR09 Service Instructions Manual

SERVICING
VOLT/OHM
METER
Ohmmeter for testing holding coil
Voltmeter for testing contacts
TESTING COMPRESSOR CONTACTOR
(Three-phase)
S-9

CHECKING FAN RELAY CONTACTS

HIGH VOLTAGE!
Disconnect ALL power before servicing
or installing. Multiple power sources
may be present. Failure to do so may
cause property damage, personal injury
or death.
1. Disconnect wire leads from terminals 2 and 4 of Fan Relay
Cooling and 2 and 4, 5 and 6 of Fan Relay Heating.
2. Using an ohmmeter, test between 2 and 4 - should read
open. Test between 5 and 6 - should read continuous.
3. With power ON, energize the relays.
WARNING
Line Voltage now present.
OHMMETER
TESTING FAN RELAY
4. Using an ohmmeter, test between 2 and 4 - should read
continuous . Test between 5 and 6 - should read open.
5. If not as above, replace the relay.
T3 T2 T1
CC
L3 L2 L1
4
3
1
2 5
54
Checking Relay Contacts - PSC Fan Motor
HIGH VOLTAGE!
Disconnect ALL power before servicing
or installing. Multiple power sources
may be present. Failure to do so may
cause property damage, personal injury
or death.
1. Disconnect the motor leads from 6-circuit fan motor wire
harness.
2. Connect a voltmeter between circuit 6 and circuits 3 (low
speed) or 1 (high speed).
NOTE: Circuit 6 is connected directly to 24VAC.
3. Energize the system at low or high stage.
WARNING
Line Voltage now present.
4. The measured voltage between circuit 6 and circuits 3 or 1
should be approximately 0VAC, which indicates the relay
contacts are closed. A voltage measurement of approxi-
mately 24VAC indicates the relay is open. Replace the con-
trol if the relay checks open when it should be closed. See
following notes and cautions.
NOTE: Ensure any ON delays have expired before making volt-
age measurements
CAUTION: Prolonged operation with the condenser fan motor
disconnected will cause the high pressure switch to trip.
S-10 MBR/AR*F ELECTRONIC BLOWER TIME DELAY
RELAY
The MBR/AR*F contains an Electronic Blower Time Delay Relay
board, B1370735. This board provides on/off time delays for the
blower motor in cooling and heat pump heating demands when
"G" is energized.
During a cooling or heat pump heating demand, 24Vac is sup-
plied to terminal "G" of the EBTDR to turn on the blower motor.
The EBTDR initiates a 7 second delay on and then energizes it's
onboard relay. The relay on the EBTDR board closes it's normally
open contacts and supplies power to the blower motor. When
the "G" input is removed, the EBTDR initiates a 65 second delay
off. When the 65 seconds delay expires the onboard relay is
de-energized and it's contacts open and remove power from the
blower motor.
During an electric heat only demand, "W1" is energized but "G"
is not. The blower motor is connected to the normally closed
contacts of the relay on the EBTDR board. The other side of this
set of contacts is connected to the heat sequencer on the heater