Installation Manual and Owner's Guide
5. Now remove the cover on the top refrigerant connection 
valve using a 19 mm open ended wrench (i.e. crescent or 
adjustable). Open the valve by turning it counter-clockwise as 
far as it will go using a 5 mm Allen key. The valve is now open. 
If the valve is not opened fully, the system may malfunction 
and suffer damage. Screw the cover back on to the top valve 
and tighten it well to ensure that it is properly sealed.
CAUTION
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mrcool.com
Refrigerant Piping Connection
6. Now remove the cover on the bottom valve using a 19 
mm crescent (or adjustable) wrench. Open the valve by 
turning it counter-clockwise as far as it will go using a 5 
mm Allen key. The valve is now open. If the valve is not 
opened fully, the system may malfunction and suffer 
damage. Screw the cover back on to the bottom valve 
and tighten it well to ensure that it is properly sealed.
7. After completing steps 1- 6, repeat steps 2-6 for each lineset. Check that all of the connections are sealed correctly 
using leak detection spray or soap suds. If any bubbles form, the system has a leak and the screw connectors must be 
retightened using a crescent or adjustable wrench.
8. After opening all of the lineset connection valves, you must also open the two main valves 
(King Valve) as indicated after installation is complete. To do this, remove the plastic caps, 
and turn counter clockwise with a 5mm allen wrench.
9. Start the equipment so that the operating pressures build 
up inside the system. Check all the connectors again for 
signs of leaks
a)  during cooling mode
b)  in heating mode.
NOTE
If any bubbles form, the system has a 
leak and the screw connectors must be 
retightened.
All of these steps must be completed BEFORE powering on the unit. Failing to do so 
could damage the unit.










