Appendix SiE33-102
100 General Information
7.3 Additional Charge of Refrigerant
Notes: 1. Refrigerant must be replenished for the R-22 VRV PLUS Series just as with past VRV Series.
2. If refrigerant is not replenished, the system will not operate properly.
3. For information on how to calculate the amount of refrigerant to be added, see next page.
Heat Pump System Example
Work points
1. Select a level spot to place the scale.
2. Invert the refrigerant cylinder and refill in liquid state.
3. Be careful not to get frostbitten by refrigerant when purging air from the charge hose.
(About –40˚C in atmosphere for R-22)
4. Refill from liquid pipe and pressure equalizing pipe simultaneously.
5. You don’t have to replenish refrigerant for each system. (You must check if the system need additional
refrigerant charge before proceeding.)
6. Be sure to record the amount of refrigerant added on the label provided on the outdoor unit for that
purpose as a reference for service or maintenance later on.
You must add refrigerant according to the length of piping in the field just as with previous VRV Series. It
may be convenient to record the length of the piping after installation on the outdoor unit’s label. When you
are finished vacuuming the system, add refrigerant before opening the outdoor unit’s stop valve. Amount of
refrigerant is calculated according to the length of the liquid pipe.
Charge hose
Scale
Refrigerant
cylinder
Gauge manifold
Main Unit Sub Unit
(V1056)
Si33-102.book Page 100 Tuesday, June 26, 2001 3:18 PM
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