Bunn CW-APS, CWT-TSR service manual Service Control Thermostat, Limit Thermostat

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SERVICE (cont.)

CONTROL THERMOSTAT (cont.)

Removal and Replacement:

1.Remove wires from control thermostat leads.

2.Remove the thermostat capillary bulb by firmly pulling up on the capillary at the tank lid. This will disengage the grommet from the tank lid.

3.Early Models: Remove the two #8-32 screws se- curing control thermostat bracket mounted inside the hood.

Late Models: Remove the one #8-32 screw secur- ing the control thermostat to the component bracket in the trunk.

4.Slide the grommet to the line 4.5" above the bulb on the new capillary tube.

5.Insert the capillary bulb through the hole in the tank lid and press the grommet firmly and evenly so that the groove in the grommet fits into the tank lid.

6.Carefully bend the capillary tube so that the tube and bulb inside the tank are in the vertical position.

NOTE - The capillary tube must be clear of any electri- cal termination and not kinked.

7.Early Models: Using two #8-32 screws secure the control thermostat inside the hood.

Late Models. Using one #8-32 screw secure the control thermostat to the component bracket in- side the trunk.

8.Refer to Fig. 3 when reconnecting the wires.

9.Adjust the control thermostat as required.

BLU to BLU Wire from Limit Ther- mostat

BLK to BLK Wire from Tank Heater (Brewers W/Out Faucet)

BLK to Thermal Cut-Off from Tank Heater (Brewers with Faucet)

FIG. 3 CONTROL THERMOSTAT TERMINALS P1129

LIMIT THERMOSTAT

P1127.40

FIG. 4 LIMIT THERMOSTAT

Location:

The limit thermostat is located inside the rear of the hood on the tank lid.

Test Procedures:

1.Disconnect the brewer from the power source.

2.Disconnect the blue and black wires from the limit thermostat.

3.With an ohmmeter, check for continuity across the limit thermostat terminals.

If continuity is present as described, the limit thermostat is operating properly.

If continuity is not present as described, replace the limit thermostat.

Removal and Replacement:

1.Remove all wires from limit thermostat terminals.

2.Carefully slide the limit thermostat out from under the retaining clip and remove limit thermostat.

3.Carefully slide the new limit thermostat into the retaining clip.

4.Refer to Fig. 5 when reconnecting the wires.

BLU to BLU Lead from

Control Thermostat

BLK to Tank

Heater Switch

P1800

FIG. 5 LIMIT THERMOSTAT TERMINALS

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Contents CWT-TSR Introduction WarrantyUser Notices Plumbing Requirements Electrical RequirementsElectrical Hook-Up Models CW-APS & CWT-TSEarly MO Dels W/OUT Fauc ET Plumbing RequirementsThird Type Models W/FAUCET Models CWTF-APS, CWTF-TS CWTF-TSR4A.Models CW-APS & CW-TS Initial SET-UP6A.Models CW-APS & CW-TS 8A.Models CWA-PS & CW-TSON/OFF Switch Adjusting Brew VolumesStart Switch Operating Controls5A.Models CW-APS & CW-TS CleaningCoffee Brewing Problem Probable Cause Remedy TroubleshootingBrew cycle will not start CWT No water Must be openProblem Probable Cause Remedy TroubleshootingCWTF-TS, CWT-TSR &CWTF TSRCWTF-TSR ProblemBeverage overflows dispenser Spitting or excessive steaming Dripping from sprayheadControl Thermostat Syphon System Lime Build-up DispenserCWTF-TS, CWT-TSR, CWTF-TSR CWT-APS, CWTF-APS, CWT-TSBrewer is making unusal noises Tank Heater Remove and clean lime off the tank heater. SeeCWT-TS, CWTF-TS, CWT-TSR CWTF-TSR Contents ServiceComponent Access Control Thermostat ServiceLimit Thermostat Service Control ThermostatON/OFF Switch Location Test Procedures Disconnect the brewer from the power sourceSolenoid Valve Start Switch Terminals Start SwitchTank Heater Tank HeaterService Tank Heater Tank Heater Switch Tank Heater SwitchTank Heater Switch Terminals Service Tank Heater SwitchDisconnect the black and white wires to the sole- noid Service TIMEREarly ModelsOLD Style Service TimerIf voltage is as described, proceed to #7 Digital Brew Timer Late ModelsTimer Setting Service Digital Brew Timer Late Modelscont10690 10690 10690 10690 10690