Belshaw Brothers 616BT Operator's Manual download pdf (Page 25)

Belshaw Bros., Inc. • www.belshaw.com • Phone 206-322-5474 • Fax 206-322-5425

616B & 616BT TS MN-1138EN 7

Testing the Continuity of

the Thermostat

WARNING

To avoid the possibility of electric shock,

disconnect the machine from the power

source before testing.

1. Disconnect the machine from the power

supply.

2. Disconnect the terminal wires from the

thermostat.

3. Connect the continuity tester across the B

terminals indicated in Figure 4-2. This set of

contacts should be closed whenever the

thermostat is on. To test, start with the

thermostat in the OFF position. Then turn

the thermostat up until you hear a distinct

click (at about the 175°F/79°C setting). At

this time, there should be continuity across

the B terminals.

4. Connect the continuity tester across the A

terminals indicated in Figure B-2. Start with

the thermostat in the OFF position and turn

the thermostat up until you hear a distinct

click. If there is no continuity (the indicator

or light does not come on), proceed to

step 5.

5. With the continuity tester still connected,

turn the thermostat knob to OFF and remove

the knob. There is an adjusting screw in the

center of the knob stem. Turn it counter-

clockwise until there is continuity. If there

is no continuity (the indicator or light does

not come on), then the thermostat is

defective. If there is continuity, proceed to

step 6.

6. Immerse the thermostat sensing bulb in a

pan of boiling water and set the thermostat at

about 212°F/100°C. The continuity tester’s

indicator or light should go off. If the indicator

or light does not go off, increase the temperature

setting of the thermostat until it does. Then

recalibrate the thermostat according to the

manufacturer’s instructions. If the indicator or

light will not go off at any setting or

recalibration, then the thermostat is defective.

Figure 4-2. Thermostat Terminals.

“B” terminals

“A” terminals

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Belshaw Brothers 616BT Operator's Manual Page 25

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