(2)  
Make sure that the duct flanges and the modulating valve flanges are clean.

 S 424-025

 (3)  
Install the seals and the modulating valve in the duct.

 (a)  Make sure that the flow arrow on the modulating valve points in the following direction: 1) Flight Deck, Upper Deck, and Crew Rest Area Valves -
Forward 2) Forward and Aft Main Deck Valves - Towards the Bulkhead 3) Lower Forward Cargo Valve - Forward
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 4)  Lower Aft Cargo Valve - Up
 S 434-026
 (4)  Install the clamps at each end of the modulating valve.
 S 434-027
 (5)  Tighten the clamp nuts to the following torque while you hit each clamp lightly with a plastic or rawhide mallet: (a) Lower Aft Cargo Valve - 75 | 10 in-lbs (b) All other valves - 50 | 5 in-lbs.
 S 434-028
 (6)  Install the bonding jumper on the modulating valve if you installed one of the following valves: (a) Forward of Aft Main Deck Valves (b) Lower Forward of Aft Cargo Valves
 S 764-031
 (7)  Make sure that the bonding resistance between the valve and the bonding jumper is at not more than 0.010 ohms.
 S 434-029
 (8)  Install the electrical connector on the modulating valve. (a) Flight Deck DV450 (b) Upper Deck DV451 (c) Crew Rest Area DV554 (d) Main Deck Forward DV550 (e) Main Deck Aft DV551 and DV552 (f) Lower Forward Cargo DV460 (g) Lower Aft Cargo DV461
 S 864-029
 (9)  Remove the DO-NOT-CLOSE identifiers and close these circuit breakers:
 (a)  P6 Main Power Distribution Panel 1) 6F28 ZONE TEMP CONT AC 2) 6F29 ZONE TEMP CONT DC
 S 864-030

 (10) Remove DO-NOT-CLOSE identifiers and close the circuit breakers for the applicable valve that you installed:
 (a)  FLIGHT DECK VALVE 1) P6 Main Power Distribution Panel a) 6G36, AUTO/MAN TEMP CONT
 2)  P414 Main Power Distribution Panel, Left a) 414A12, FLT DK MANUAL TEMP CONT
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 (b)  
UPPER DECK VALVE
 1) None

 (c)  
CREW REST AREA VALVE

 1)  P6 Main Power Distribution Panel a) 6G34, UPR DK CREW MOD VLV

 (d)  
FORWARD MAIN DECK VALVE 1) P6 Main Power Distribution Panel a) 6G36, AUTO/MAN TEMP CONT ZN MN DK FWD

 2)  P415 Main Power Distribution Panel, Right a) 415B26, MAN TEMP CONT FWD MN DK

 (e)  
AFT MAIN DECK VALVE
 1) P6 Main Power Distribution Panel
 a) 6G36, AUTO/MAN TEMP CONT

 2)  P414 Main Power Distribution Panel, Left a) 414B14, AFT MN DK MAN TEMP CONT

 (f)  
LOWER FORWARD CARGO VALVE

 1)  P415 Main Power Distribution Panel a) 415B27, MAN TEMP CONT LWR CARGO FWD

 (g)  
LOWER AFT CARGO VALVE

 1)  P415 Main Power Distribution Panel, Left a) 415B28, MAN TEMP CONT LWR CARGO AFT
 D.  Do a Test of the Valve
 S 864-040
 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 744-037

 (2)  
Do a ground test for the trim air system at the CMC CDU
 (AMM 21-61-00/501):

 (a)  
Make sure the TRIM AIR switch on the overhead P5 panel is set to OFF.

 (b)  
Select GROUND TEST on the CMC main menu.

 (c)  
Select Chapter 21 AIR CONDITIONING on the CMC.

 (d)  
Select TRIM AIR SYSTEM on the CMC.

 (e)  
Make sure that the IN PROGRESS indication shows on the CMC CDU.

 (f)  
Make sure that the PASS indication shows on the CMC CDU.

 S 794-041
 (3)  Do a check of the valve installation for leaks:
 (a)  
　
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