S 495-070

 (8)  
Connect the thermal switch cable to the thermal switch receptacle on the tester and fasten the cable clips to the terminals of the thermal switch to be tested.

 ~................................................................ | THERMAL SWITCH | OPEN TEMP | CLOSE TEMP | DEADBAND | ..................….................….................…........... | Elmwood Part Number | .................................................................. | 3100-250-1 | 180 |20°F | 200 |20°F | 7°F | | | 82 |11°C | 93 |11°C | 4°C | .................................................................. | 3100-250-2 | 220 |23°F | 250 |23°F | 12°F | | | 104 |13°C | 121 |13 C | 7°C | .................................................................. | 3100-250-3 | 27O |23°F | 300 |23°F | 12°F | | | 135 |13°C | 148 |13°C | 7°C | ..................….................….................…........... | Sundstrand (Kistler) Part Number | .................................................................. | 975-0304-001 | 180 |20°F | 200 |20°F | 7°F | | | 82 |11°C | 93 |11°C | 4°C | .................................................................. | 975-0304-002 | 220 |23°F | 250 |23°F | 12°F | | | 104 |13°C | 121 |13°C | 7°C | .................................................................. | 975-0304-003 | 270 |23°F | 300 |23°F | 12°F | | | 135 |13°C | 148 |13°C | 7°C | 2.................….................….................…..........1
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 865-068
 (9)  With the H294 Tester, do the steps that follow:
 (a)  
Put the POWER switch to the ON position on the Thermal Switch Tester.

 (b)  
Make sure the red light over K in the TEST INPUT display comes on and the red light over C in DEGREES display comes on.

 (c)  
Make sure the CONTROL TEMP shows 0, and the TEST INPUT and HEATER TEMP shows the ambient temperature.

 (d)  
Push the DSPY TEST button on the keyboard.

 (e)  
Make sure all lights in TEST INPUT and DEGREES display come on.

 (f)  
Make sure the TEST INPUT shows 88.88 and the HEATER TEMP and CONTROL TEMP show 8888.

 (g)  
Push the SET TEMP button on the keyboard.

 (h)  
Make sure the CONTROL TEMP display and the DEGREES lamp flash.

 (i)  
Push the button C or F for the type of the temperature indication.

 WARNING: DO NOT TOUCH THE HOT METAL PART OF THE HEATER PROBE WHEN
_______ THE PROBES ARE HOT. THE HOT HEATER PROBES CAN CAUSE SEVERE BURNS IF NOT HANDLED CORRECTLY OR NOT ALLOW TO COOL SUFFICIENTLY.
 (j)  For the 3100-250-1 or the 975-0304-001, push the numbered buttons on the keyboard for a probe target temperature of 165°F or 74°C. For the 3100-250-2 or the 975-0304-002, push the numbered buttons on the keyboard for a probe target temperature of 212°F or 100°C. For the 3100-250-3 or the 975-0304-003, push the numbered buttons on the keyboard for a probe target temperature of 260°F or 127°C.
 NOTE: This temperature selection will let the heat probe
____ stabilize at a temperature slightly below the nominal close temperature. After the probe is stabilized, you can gradually increase the temperature of the probe until the switch closes.
 (k)  
Push the ENTR button.

 (l)  
Make sure the HEAT ON light comes on and the probe temperature increases.

 (m)  
Make sure that as the HEATER TEMP display nears or reaches the CONTROL TEMP display, the HEAT ON light flashes to indicate the probe is near the set temperature.

 (n)  
Allow the heat probe to stabilize at this temperature.

 (o)  
Slowly increase the temperature of the heat probe until the SWITCH CLOSED light comes on.

 (p)  
Make sure the HEATER TEMP is within the limits for the temperature switch closed setting.

 (q)  
Make sure the EICAS shows the BLD DUCT LEAK C, BLD DUCT LEAK R, or BLD DUCT LEAK L caution message.

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