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Johnson Controls Y99AB-4, Application Note

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Johnson Controls Y99AB-4 Application Note Download Page 6

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Y99AB-4 BASO Test Kit Application Note

“A”

Valve

Reset

Button

Pilot Burner

Gas Line

44549-7

Thermocouple

Lead

Black

Red

44549-8

Figure 8: Typical Thermocouple-operated Gas Valve Connection Diagram

Power

Source

Thermostat

Transformer

44549-7

44549-8

BASO

Magnetic
Operator

BASO
Power

Unit

Reset

Button

“B”

Valve

Shutoff

Valve

Pilot Burner

Gas Line

Thermocouple

Lead

Red

Black

Figure 9: Typical Electrically-operated Gas Valve Connection Diagram

Summary of Contents for Y99AB-4

Page 1: ...res for each division on the dial Continuity Tester for detecting a broken or open circuit Definitions Automatic Pilot A device employed with gas burning equipment which automatically shuts off the gas supply to the burner being served by either direct or indirect means when the pilot flame is extinguished The pilot burner may or may not be constructed integrally with the device Closed Circuit Mil...

Page 2: ... thermocouple operated gas valve electrically operated gas valve and safety shutoff device connection diagrams Perform the following procedure for taking open circuit millivolt readings 1 Shut off the gas supply at the main manual shutoff valve 2 Disconnect the thermocouple from the BASO control 3 Attach the test cable lead 44549 8 to the thermocouple Connect the red clip to the copper tubing of t...

Page 3: ...p to the copper tubing of the adapter assembly and the black clip to the control end of the adapter assembly see Figure 5 3 Set the slide switch on the meter to the 0 50 or 0 1000 position 4 Reestablish pilot flame 5 The millivolt reading should agree with the values listed in Table 1 with a normal pilot flame see Figure 3 Note When taking a fixed load millivolt reading on a junction block thermoc...

Page 4: ... The milliampere reading at the moment of release is the dropout point of the BASO power unit Take two more readings by the same process and average the readings The milliampere dropout point must lie within the high and low range listed in Table 2 7 Pilot and main burner should extinguish within a few seconds If flames do not extinguish refer to the Troubleshooting section 44549 8 H17 Gas Valve R...

Page 5: ...llowing procedure for closed circuit testing 1 Disconnect the thermocouple from the BASO control 2 Attach the adapter assembly 64119 1D to the control and thermocouple 3 Remove the shorting jumper clip from the adapter assembly 4 Set the slide switch on the meter to the 0 50 position 5 Attach the test cable lead 44549 8 Connect the red clip to the copper tubing of the thermocouple and the black cl...

Page 6: ... 44549 8 Figure 8 Typical Thermocouple operated Gas Valve Connection Diagram Power Source Thermostat Transformer 44549 7 44549 8 BASO Magnetic Operator BASO Power Unit Reset Button B Valve Shutoff Valve Pilot Burner Gas Line Thermocouple Lead Red Black Figure 9 Typical Electrically operated Gas Valve Connection Diagram ...

Page 7: ...it Application Note 7 Transformer Shutoff Valve Pilot Burner Gas Line 44549 7 Black Red 44549 8 B Valve L Series Control Power Source Thermostat Thermocouple Lead Figure 10 Typical Safety Shutoff Device Connection Diagram ...

Page 8: ...r burning manual valve if included turned to the On position thermostat calling for heat Main burner does not come on Defective operator Check for operator input voltage If present replace the valve If not check voltage source Shorted thermostat circuit Perform the Continuity Testing procedure Thermostat not calling for heat or turned down manual valve if included in the On position Main burner do...

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