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5

Installation

1.  Plumb the MDV XL downstream of the AOP (Figure 1).   

 

Note:

 AOP 50 with same side plumbing shown in Figure 1. Some 

AOP units may also have opposite side plumbing.  

 

Use appropriate NSF approved primer and cement to plumb into 

the circulation loop. Before placing the MDV XL on your equipment 

pad, note clearance dimensions of 4” around and 20” above. Refer 

to Figure 2 for critical dimensions.

2.  Remove the threaded plug in the center of the housing. If 

possible, run the pool system at low flow. Allow the housing to 

fill and discharge any debris such as PVC shavings. Shut off pool 

system before proceeding.

3.  Apply thread sealant to vent adapter threads. Install vent adapter 

through the hole in the housing handle and into the housing 

(Figure 3).

4.  Use NSF approved primer and cement to attach the vent assembly 

to the open pipe end of the vent adapter. Orient the vent assembly 

(Figure 3). 

5.  Mount the carbon destruct to the destruct bracket with the two 

mounting screws provided (Figure 3).

6.  Connect the ozone tube and exhaust tube using the tube clamps 

(Figure 3). Tubing clamps should be tightened behind the hose 

barb feature for proper attachment.

7.  The exhaust tube will release small amounts of condensation and 

carbon under normal operation. To avoid water or carbon stains, 

route the exhaust tube to divert the condensation to a suitable 

location. 

8.  If the MDV XL does not fill properly, gas bubbles will return to 

the pool. In this case, an additional ball valve may be needed to 

maintain an adequate water level in the housing. Install the ball 

valve just after the MDV XL outlet (Figure 1). Close the valve only 

enough to prevent bubbles from returning to the pool.

NOTE

: In cases where the MDV XL is located above the water line, 

bubbles will exit the return line upon startup. The bubbles will stop once 

the MDV XL fills with water.

INSTALLATION

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