(2)
Provide electrical power.
(3)
Check that pneumatic system is not pressurized.
(4)
Check that POSITION IND circuit breaker and all air conditioning circuit breakers on panels P6-3 and P6-4 are closed.
(5)
Simulate pack valve open position.
(a)
Open OVERHEAT circuit breaker.
(b)
Remove connector from pack valve limit switch. (See figure 501.)
(c)
Close OVERHEAT circuit breaker.
501
Feb 15/72 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 21-61-71 Page 501
Air Mix Valve Position Indicating System Equipment 501
21-61-71 Figure 501 (Sheet 1) Feb 15/72
Page 502
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
501 Air Mix Valve Position Indicating System Equipment
Feb 15/72 Figure 501 (Sheet 2) 21-61-71
Page 503
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
C. Adjust Transmitter
(1)
Check that mix valves are in the full cold position by observing position indicator on side of valve. (See figure 501.)
(2)
Check that CABIN AIR MIX VALVE indicator is at full COLD.
(3)
Move the PACK switch to ON.
(4)
Hold temperature selector knob to MANUAL WARM and check that mix valve moves to full hot by observing valve position indicator.
(5)
Hold temperature selector knob to MANUAL COOL and check that mix valve moves to full cold position.
(6)
Check that AIR MIX VALVE indicator pointer is in the full COLD position.
NOTE: Full COLD is indicated when the pointer aligns with the inner of the two closely spaced index marks at COLD end of the indicator scale. Full HOT is at the inner of the two closely spaced index marks at the other end of the scale.
(7)
If indicator pointer does not indicate correctly, adjust indicating system.
(a)
Remove position potentiometer cap located on mix valve and loosen screws in the clamp retaining the potentiometer, then rotate potentiometer housing relative to its shaft until the pointer and scale are in alignment.
NOTE: If the CABIN AIR MIX VALVE indicator suddenly goes off scale in the HOT direction while adjusting, rotate the housing of the potentiometer in the opposite direction.
(b)
When the desired reading is obtained, tighten the screws retaining the potentiometer and replace cap.
(c)
Hold temperature selector to MANUAL WARM until valve drives to full hot and check that indicator pointer aligns with inner index mark at HOT end of scale.
(d)
If indicator does not align, adjust trimpot R2 (passenger cabin mix valve) or R3 (Control cabin mix valve) located on the Al card mounted in the P5-17 air conditioning module as required.
(10)
Move the PACK switch to OFF.
(11)
Open OVERHEAT circuit breaker.
(12)
Install connector to pack valve limit switch.
(13)
Close OVERHEAT circuit breaker.
(14)
Close air conditioning equipment bay doors.
(15)
If no longer required, remove electrical power from airplane.
501
21-61-71 Page 504 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Feb 15/72
501
Feb 15/73 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 21-61-71 Page 505
TEMPERATURE INDICATING SYSTEM - DESCRIPTION
1. General
A. The temperature indicating system permits monitoring passenger cabin temperatures and passenger cabin supply air temperature from the control cabin. The system also provides the crew an early warning of problems in the air cycle system or air supply and assists in trouble shooting the air conditioning system.
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