Service manual

ManualsBrandsBunn-O-Matic ManualsCoffee Makers39100.0005

FIG. 10 THERMOSTAT WIRING

BLU/BLK to Limit Thermostat

BLK to Terminal Block

P1782

SERVICE (cont.)

Thermostat (H5M, HW2 & OHW Only)

Location: The mechanical thermostat is located inside

the upper rear panel. To test the thermostat, access will

also be needed to the terminal block located inside the

bottom access panel.

Test Procedure:

1. Disconnect the dispenser from the power source.

2. Check the voltage across the black wire on the

thermostat and the white or red wire at the terminal

block with a voltmeter. Connect the dispenser to the

power source. The indication must be:

a.) 100 to 120 volts ac for 100 to 120 volt models,

b.) 200 to 240 volts ac for 200 to 240 volt models,

c.) 230 volts ac for 230 volt models.

3. Disconnect the dispenser from the power source.

If voltage is present as described, proceed to #4.

If voltage is not present as described, refer to the Wiring

Schematics and check the dispenser wiring harness.

4. Check the voltage across the blue/black wire on

the thermostat and the white or red wire at the

terminal block with a voltmeter when the ther-

mostat is turned “ON” (fully clockwise). Connect

the dispenser to the power source. The indication

must be as described in step 2. Voltage must not

be indicated when the thermostat is turned “OFF”

(fully counterclockwise).

5. Disconnect the dispenser from the power source.

If voltage is present as described, the thermostat is

operating properly.

P1781

If voltage is not present as described, replace the

thermostat.

Removal and Replacement:

1. Remove both wires from the thermostat terminals.

2. Remove the top lid from the dispenser to gain ac-

cess to the thermostat bulb.

3. Remove the thermostat bulb by ﬁrmly pulling up on

the capillary tube at the tank. This will disengage

the grommet from the tank.

4. Remove the two #6-32 screws holding the thermo-

stat to the mounting bracket.

5. Fasten the new thermostat to the mounting bracket.

NOTE: Make sure that the capillary tube is away from

any electrical termination and is not kinked.

6. Slide the grommet to the red mark on the capillary

tube.

7. Insert the bulb through the hole in the tank and

press the grommet ﬁrmly and evenly so that the

groove in the grommet ﬁts into the tank.

8. Refer to FIG. 10 when reconnecting the wires.

9. Readjust the thermostat dial as required.

FIG. 9 THERMOSTAT

(H5M SHOWN. HW2 & OHW SIMILAR)

42311 092414