(2)
Open the access panel 171AL.
(3)
Open the FWD cargo-compartment door (Ref. TASK 52-30-00-860-001).
(4)
Remove the access panels 131PW, 131NW.
(5)
Remove the blanking plug from the test port downstream of the pressure reducing and relief valve 4200MM.
R **ON A/C 151-199, 301-399, 401-499,
Subtask 38-41-00-865-051-A
B. Make sure that this(these) circuit breaker(s) is(are) closed: -------------------------------------------------------------------------------PANEL SERVICE IDENT. LOCATION -------------------------------------------------------------------------------
2001VU WATER SYS - QUANT IND 1MA B06
Subtask 38-41-00-010-052-A
C. Get Access
(1)
Put the access platform in position at Zone 171.
(2)
Open the access panel 171AL.
(3)
Open the AFT cargo-compartment door (Ref. TASK 52-30-00-860-001).
(4)
Remove the access panel 161DW.
(5)
Remove the blanking plug from the test port downstream of the pressure reducing and relief valve 4200MM.
**ON A/C ALL
Subtask 38-41-00-480-052
D. Installation of Test Equipment
(1)
Connect a manometer 60 psi to the test port.
(2)
Connect the air supply cart to the ground air connection at the service panel 2023VU.
Subtask 38-41-00-613-052
E. If necessary fill the potable tank (Ref. TASK 12-15-38-613-001).
4. Procedure
_________
**ON A/C 001-049, 051-099, 101-149, 201-299,
(Ref. Fig. 502/TASK 38-41-00-991-002) R **ON A/C 151-199, 301-399, 401-499,
(Ref. Fig. 502A/TASK 38-41-00-991-002-A)
**ON A/C ALL
Subtask 38-41-00-860-051
A. Preparation for Test
(1)
Pressurize the potable water system (Ref. TASK 38-10-00-614-001).
(2)
Make sure that the pressure becomes stable.
(3)
Examine the pressure at the manometer and monitor the error.
(4) Depressurize the potable water tank (Ref. TASK 38-10-00-614-002) **ON A/C 001-049, 051-099, 101-149, 201-299, 301-399,
Subtask 38-41-00-820-050
B. Adjust the Pressure Reducing and Relief Valve
(1)
Operate the ground air supply to a pressure between 41 psi (2.8268 bar) and 47 psi (3.2405 bar) until the pressure is stable.
(2)
Make sure that the pressure at the manometer shows between 25 psi (1.7236 bar) and 28 psi (1.9305 bar).
(3)
Turn the pressure regulater adjuster clockwise to increase the pressure or counterclockwise to decrease the pressure as necessary.
Pressure Reducing Valve - Adjustment
Figure 502/TASK 38-41-00-991-002
R 1EFF : 001-049, 051-099, 101-149, 201-299, 1 38-41-00Page 524 1 1 May 01/05 1 1 1CES 1
Pressure Reducing Valve - Adjustment
Figure 502A/TASK 38-41-00-991-002-A
R 1EFF : 151-199, 301-399, 401-499, 1 38-41-00Page 525 1 1 Aug 01/05 1 1 1CES 1
(4) Turn the control handle on the potable-water service panel from the NORMAL to the FILL position to release the pressure from the system.
NOTE : Air will flow from the overflow port. If there is water in the
____ system, water will flow from the fill port.
NOTE : When the pressure in the potable water system decreases, the
____ reducing valve starts the air supply to the system again.
(5)
Make sure that the pressure at the manometer shows between 25 psi (1.7236 bar) and 28 psi (1.9305 bar).
(6)
If necessary, do the procedure again until the pressure is correct NOTE : It is not necessary to adjust the relief pressure of the valve
____ after you adjust the reducing pressure.
(7) Close the ground air supply. R **ON A/C 151-199, 401-499,
Subtask 38-41-00-820-050-A
B. Adjust the Pressure Reducing and Relief Valve
(1)
Operate the ground air supply to a pressure between 41 psi (2.8268 bar) and 47 psi (3.2405 bar) until the pressure is stable.
(2)
Make sure that the pressure at the manometer shows between 22 psi (1.5168 bar) and 25 psi (1.7236 bar).
(3)
Turn the pressure regulater adjuster clockwise to increase the pressure or counterclockwise to decrease the pressure as necessary.
(4)
Turn the control handle on the potable-water service panel from the NORMAL to the FILL position to release the pressure from the system.
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