Installation Guide

Page 33 mrcool.com

Refrigerant Piping Connection

Step 5: Opening the refrigerant valves of the outdoor unit

3. If you’re installing a 3, 4, or 5-zone condenser, after opening all of the line set connection valves, you must

also open the two main valves (King Valves), as shown in the images below. To do this, ﬁrst unscrew the

caps from the valves in a counter-clockwise direction using an appropriate-sized wrench, or crescent

(adjustable-type) wrench. Then, insert a 5 mm Allen key and open each of the valves by turning them

counter-clockwise as far as they will go. DO NOT force it. Then, reinstall the caps and tighten them

securely to ensure that they are properly sealed.

King

Valves

If the King Valves are not fully opened, the system could malfunction and suﬀer damage.

CAUTION

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.

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.

CAUTION

All of these steps must be completed BEFORE powering the unit, or else it could damage it.