Bunn Dual TF User Manual download pdf (Page 17)

Page 17

SERVICE (cont.)

CONTACTOR ASSEMBLY (cont.)

Test Procedures :

Electronic Control (Brewers w/Recovery Booster)

1. Disconnect the brewer from the power source.

2. Disconnect the gray wire from the black wire on

the contactor coil and white /brown wire from the

remaining black wire on the contactor coil.

NOTE: ECA MODELS ONLY - Brewer must be at

operating temperature to perform step #3 or brew-

lock must be bypassed. To bypass brew-lock

disconnect white/orange and brown/black for right

timer or orange and red/black for left timer from

brew-lock of ECA and connect harness leads to-

gether.

3. Check the voltage across the gray wire and white/

brown with a voltmeter with both "ON/OFF" switches

in the "ON" position. Connect the brewer to the

power source and press both start switches. The

indication must be:

a.) 120 volts ac for three wire 120/208 volt mod-

els and three wire 120/240 volt models.

b.) 200 to 240 volts ac for two wire 200 or 240 volt

models.

4. Disconnect the brewer from the power source.

If voltage is present as described, proceed to #5.

If voltage is not present as described, refer to the

wiring diagrams and check the brewer wiring harness.

5. Disconnect the blue and red wires from the

contactor terminals. Check for continuity across

the terminals of the contactor by manually closing

the contacts. Continuity must not be present when

the contact is released.

If continuity is present as described, reconnect the

blue and red wires to the contactor terminals. Connect

one black lead from the contactor coil to the gray wire

and the white/brown wire to the remaining black lead

of the contactor coil. Reconnect brew-lock wires to

interlock of the ECA if necessary. The contactor is

operating properly.

If continuity is not present as described, replace the

contactor.

P778

BLK to BLK Lead from Thermostat

BLK to White Lead from the Three

Pole 120/208V or 120/240V

Terminal Block

BLK to Red Lead from the Two

Pole 200V or 240V Terminal

Block

RED T1 to Left Tank Heater

RED T1 to Right Tank Heater

BLK T2 to Left Tank Heater

BLK T2 to Right Tank Heater

BLK L2 to Terminal Block

(Black Insert)

RED L1 to Terminal Block

(Red Insert)

MECHANICAL THERMOSTAT W/RECOVERY BOOSTER

RED T1 to To Terminal Block

(Red Insert )

BLK to WHI/BRN to

Left Dispense Valve

BLK to GRY on

Relay

BLU L1 to Left Tank

Heater

ELECTRONIC CONTROL W/RECOVERY BOOSTER

Removal and Replacement:

1. Remove all wires from the contactor.

2. Remove the two #10-32 slotted head screw secur-

ing contactor to the inside of the hood.

3. Securely install the new contactor inside the hood.

4. Refer to the following illustration when reconnect-

ing the wires.

27124 050800

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Bunn Dual TF User Manual Page 17

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