Opening Refrigerant Valves Of Outdoor Unit - MrCool DIY E Star Series Installation & Owner's Manual

Step 5: Opening the refrigerant valves of the outdoor unit
1. Using the images below as a guide, remove the
cover on the top valve, using a 19 mm open-ended
wrench or a crescent (adjustable-type) wrench.
Then, insert a 5 mm Allen key and open the valve
by turning it counter-clockwise as far as it will go.
DO NOT force it. The valve is now open. Screw the
cover back onto the top valve and tighten it well to
ensure that it is properly sealed.
CAUTION
If the valves are not fully opened, it could cause the system to malfunction and suffer damage.
3. After completing steps 1 and 2, you will now need to check all of the piping connections (at indoor unit and
outdoor unit) for leaks. You can do this by using leak detection spray, or applying a soapy water solution (liquid
detergent/water mixture) to the connection via a spray bottle or brush. If any bubbles begin to form, that
indicates there is a leak, and the connection needs to be re-tightened. Tighten the connection and recheck it
for leaks. Refer to Electrical and Gas Leaks Checks section of this manual for more information.
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Refrigerant Piping Connection
mrcool.com
2. Using the images below as a guide, repeat the
same process for the bottom valve. Remove the
cover on the bottom valve, using a 19 mm
open-ended wrench or a crescent (adjustable-type)
wrench. Then, insert a 5 mm Allen key and open
the valve by turning it counter-clockwise as far as it
will go. DO NOT force it. Screw the cover back
onto the bottom valve and tighten it well to ensure
that it is properly sealed.
IMPORTANT:
You will be asked to check for leaks at the
piping connections multiple times throughout
the following steps of the installation, because
the pressures within the lines will change once
the unit is turned on and this could reveal
leaks not present during the initial check.
These are imperative to make sure your
connections are not allowing refrigerant to
escape the system. When checking for leaks, if
any bubbles form, it indicates the system has
a leak and the screw connector needs to be
retightened. For more information about
checking for leaks, please refer to the
Electrical and Gas Leak Checks section of the
manual.