Http://Splitoff.ru/Tehn-Doc.html - Daikin VRV System R-22 PLUS Series Manual

Si33-102.book Page 27 Tuesday, June 26, 2001 3:18 PM
SiE33-102
3.2.5 Air Tight Test
Operational steps
Complete
refrigerant pipe
installation work
Essential Points of The key to successful testing is strict adherence to the following procedure:
Testing
a) The liquid and gas piping in each refrigerant system should be pressurized in turn in accordance with
(Maintaining the following steps. (Nitrogen gas must be used.)
Pressure Over a Step 1: increase pressure to 0.3MPa for 3
Period)
minutes or more
Step 2: increase pressure to 1.5MPa for 3
minutes or more
Step 3: increase pressure to 2.8MPa for
approx. 24 hours
∗Increasing the system pressure to 3.20MPa does not guarantee the identification of minor leaks if
pressure is maintained for only a short time. It is therefore recommended that the system remain
pressurized in accordance with Step 3 above for at least 24 hours.
Note: The pressure must on no account be increased beyond 2.8MPa.
b) Check for pressure drop
If there is no drop in pressure then the test is deemed a success.
If the pressure drops then the leak must be located. See following page.
However, if there is a change in the ambient temperature between the pressurizing stage and the time
when you check for a drop in pressure then you will have to adjust your calculations accordingly since a
change of 1˚C can account for a pressure change of approximately 0.01MPa.
Compensating adjustment value:
(temperature at time of pressurizing – temperature at time of checking) × 0.1
Example:
Time of pressurizing: 2.8MPa 25˚C
24 hours later: 2.75MPa 20˚C
The pressure drop in such a case is deemed to be zero (successful test).
General Information
Pressurize Check for pressure drop
Locate and repair leaks



Indicates existence of major leaks




 Indicates existence of minor leaks



: http://splitoff.ru/tehn-doc.html

Installation
Success
(V0987)
27