Some basic HVAC tools will be needed.
What Is Pumping Down an Mini Split System?
When an HVAC unit is pumped down, all the refrigerant is pulled into the outside condenser for storage.
Most all mini split systems come with the refrigerant stored in the outside condenser and released into the system after being vacuumed down.
Pumping down a unit is placing the unit back into its original state of storage.
Tools Needed Pump Down a Mini Split HVAC System
- HVAC Gauges
- Allen Key
- Crescent Wrench
HVAC gauges will be needed to watch the pressure on the low side gauge.
An Allen key is also needed to shut off the high and low-pressure valves to lock the refrigerant inside.
A screwdriver will be needed to remove the cover and wrench to remove the caps protecting the valves.
Steps To Pump Down a Mini Split HVAC System
- Remove the cover on the outside condenser.
- Remove the service valve caps for the high and low pressure lines.
- Attach HVAC gauges to the Low side (Big Line) service valve.
- The Pressure on the Gauges Low side (Blue) will rise.
- Power On the Mini Split Unit and put it in Cooling Mode.
- Watch the HVAC Gauges Low Side (Blue) the pressure will begin to drop.
- Use an Allen Key to shut the High Pressure line off (Small Line).
- Watch the gauges for the pressure to drop to zero.
- Once the pressure drops to zero, use an Allen Key to shut the Low Pressure line off (Big-Line).
- The unit should now be pumped down with all the refrigerant in the outside condenser.