O. Position applicable PACK valve switch to ON.
P. Hold applicable temperature selector on MANUAL-WARM and check that mix valve moves to full hot.
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Q. If indicator pointer moves to full hot position, hold selector to COOL until mix valve moves to full cold then proceed to Q. If not, adjust as follows:
(1)
Remove temperature control module (P5-17) from forward overhead panel.
(2)
Adjust variable resistor R2 (passenger cabin mix valve) or R3 (control cabin mix valve) until pointer and index mark align.
(3)
Hold temperature selector to COOL until mix valve drives to full cool and check that pointer aligns with COLD index mark.
(4)
If pointer does not align rotate mix valve position transmitter to obtain alignment as described in N.(1), then repeat adjustment with mix valve moved to full hot per above.
(5)
Install temperature control module.
R. Install mix valve position transmitter cap. Close OVERHEAT circuit breaker.
S. Pressurize pneumatic system (Ref Chapter 36, Pneumatic).
T. Operate applicable air conditioning pack and check for leakage at mix valve duct clamps.
U. Remove pneumatic pressure if no longer required.
V. Remove electrical power if no longer required.
W. Close air conditioning equipment bay door.
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PASSENGER CABIN TEMPERATURE SENSOR - REMOVAL/INSTALLATION
1. General
A. Passenger cabin temperature sensor installations are not all installed the same (Fig. 401). The following procedure applies to all with any difference noted in the applicable step.
2. Remove Passenger Cabin Temperature Sensor (Fig. 401)
A. Open RIGHT AUTO TEMP CONTROL or TEMP IND FANS AND AUTO TEMP CONTROL-RIGHT circuit breaker (P6-4) as applicable.
B. For airplanes with wide body look interior, remove stowage compartment (Ref Chapter 25, Equipment/Furnishings). For airplanes with carryall stowage compartment interior, pull inboard edge of bullnose cover free from attach bulb then pull inboard cover inboard and remove. For airplanes with advanced technology interior, lower PSU assembly and gain access to (5) screws fastening bullnose to PSU beam; remove screws and bullnose.
C. Remove electrical connector from temperature sensor.
D. Remove fasteners from sensor flange and remove sensor and gasket from sensor duct.
3. Install Passenger Cabin Temperature Sensor
A. Position temperature sensor and gasket to sensor duct and install fasteners.
B. Install sensor electrical connector.
C. Open OVERHEAT circuit breaker (P6), remove limit switch electrical connector from right pack valve, then close OVERHEAT circuit breaker.
NOTE: If airplane pneumatic system is pressurized disregard C.
D. Close circuit breaker opened in 2.A. and check that all other air conditioning system circuit breakers are closed.
E. Provide electrical power.
F. Position R PACK switch to ON.
G. Position passenger cabin temperature selector to an AUTO position which will drive the mix valve to the cold position then switch selector to OFF.
NOTE: If cabin temperature is below approximately 650F (18.30C) it will be necessary to provide warm air to sensor.
H. Hold temperature selector to MANUAL WARM as required to reposition valve from full cold.
I. Return temperature selector to position selected in G. and check that mix valve returns to full cold.
J. Hold temperature selector to MANUAL WARM and check that valve moves toward WARM, then return selector to OFF.
K. If connector was removed from pack valve limit switch in C., open OVERHEAT circuit breaker, install connector, then close circuit breaker and check that mix valve drives to COLD.
L. Position R PACK switch to OFF.
M. Install stowage compartment or bullnose as applicable.
N. Remove electrical power if not longer required.
O. Raise and secure PSU assembly if applicable.
5C8
Jun 20/85 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 21-61-31 Page 401
Passenger Cabin Temperature Sensor 5C8
21-61-31 Figure 401 (Sheet 1) Jun 20/85
Page 402
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
5C8 Passenger Cabin Temperature Sensor
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