Install the Vacuum Relief Valve (Part #10003-1 for 1 1/2”; #10003-2 for 2”) in the outlet header of each row. This will be located at the opposite end of the header that is connected to the collector return line.<!--more-->
<h3><!--more-->Troubleshooting</h3>
<ul>
	<li><span style=\"font-size: 13px; line-height: 19px;\">When the solar system is first turned on, air in the collectors will be expelled into the pool and bubbles will appear. The appearance of bubbles in the pool should stop after a few minutes.</span></li>
</ul>
<ul>
	<li><span style=\"font-size: 13px; line-height: 19px;\">If, after a few minutes, bubbles continue to be discharged at the return to the pool, remove the Vacuum Relief Valve(s) and replace it with an End Cap. Relocate a Vacuum Relief Valve to a position in the inlet piping which is at a height of approximately 3/4 of the elevation of the collectors above the pool. Refer to <a href=\"http://aquathermindustries.com/portal3/wp-content/uploads/2013/04/Figure-2.bmp\">Figure 2</a>.</span></li>
</ul>
<ul>
	<li><span style=\"font-size: 13px; line-height: 19px;\">A quicker alternate method is to first try to reverse the End Cap and the Vacuum Relief Valve on the collector </span><span style=\"font-size: 13px; line-height: 19px;\">array to see if this stops the bubbles in the return lines. This is a lot quicker than cutting in a tee in the supply </span><span style=\"font-size: 13px; line-height: 19px;\">pipe.</span></li>
</ul>