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27
www.norcold.com/cda N500/N510 ModelsRefrigerator Service Manual
Method B:
1. Apply a bubble type leak detector solution between
the source of air pressure and the piping system.
2. Pressurize the system to 3 psi then shut off the air
supply valve.
3. Check for air bubbles indicating leaks.
After refrigerator has been connected to the RV LP
gas supply line:
The ANSI 119.2 Standard on Recreational Vehicles
requires that the gas piping be proven leak free by
testing after the refrigerator is connected to the LP gas
system. The LP gas connection to the refrigerator can
be leak tested using commercially available bubble leak
test solution, soap and water, or by performing a
pressure drop test (explained at below).
Before connecting the refrigerator to the RV LP gas
supply line:
The ANSI 119.2 Standard on Recreational Vehicles
requires that the gas piping be proven leak free by
testing before the refrigerator is connected to the LP
gas system. This standard requires that the system
maintains at least 3 psi for a period of 10 minutes.
Before this test is administered, the temperature of the
piping system must be approximately the same
throughout the system and a uniform temperature shall
be maintained throughout the test period. The test can
be conducted using air pressure and one of the
following methods:
Method A:
1. Connect a mercury manometer, slope gauge, or
equivalent measuring device to the LP gas system.
NOTE
The measuring device used must be calibrated so it
can be read in increments no greater than 1/10 psi.
LP Gas Pressure
LP gas pressure must be supplied and maintained
between 10.5 and 11.5 in. water column.
Bubble leak test solution/soap and water leak test:
To test the LP gas connections for gas leakage using a
commercially available leak test solution or soap and
water solution:
1. Pressurize the LP gas system between 10.5 in.
water column and 11.5 in. water column.
2. Apply the bubble leak detection solution using a
small brush or spray applicator.
3. Repair all gas leaks observed and retest for gas
leakage after completion of repairs.
Pressure drop test:
A pressure drop test requires the use of a manometer or
calibrated gauge to indicate any drop of system
pressure due to leakage. In order to pass the pressure
drop test, the system must maintain pressure over a
period of 3 minutes. The guidelines to perform a
pressure drop test are below.
1. Connect a manometer or pressure gauge to the
refrigerator LP gas system pressure tap.
2. Pressurize the LP gas system between 10.5 in.
water column and 11.5 in. water column.
3. Make sure the temperature of the piping system is
approximately the same throughout and maintain
uniform temperature throughout the test period.
4. Close the shutoff valve at the refrigerator.
5. Close the shutoff valve at the LP gas tank(s).
6. The LP gas system must maintain water column
pressure over a period of 3 minutes.
!
CAUTION:
Do not use any liquid detergents that contain ammonia
or chlorine for testing. These substances can corrode
brass components.
Testing for Gas Leakage
!
WARNING:
Do not allow the leak detecting solution to wet or come
in contact with electrical components. Leak detecting
solutions are electrically conductive and can create a
potential shock hazard, electrical shorts, and/or fire.
!
WARNING:
When working on or near the LP gas system:
T Always check for gas leaks after completing service
or repairs to the gas system. A propane gas leak
can ignite and/or explode, which can result in
extensive property damage, serious personal injury
or death.
TCheck that all tubing is free of dents or kinks
TDo not alter tubing radius.
TWhen disconnecting LP gas lines, make sure the
main LP gas valve at the tank is closed.
2. Pressurize the system to 3 psi then shut off the air
supply valve. The system must maintain 3 psi for 10
minutes.
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