What sealant should I use between AC gasket and roof?
I am installing a Penguin II low profile roof AC unit. What sealant do you recommend to fasten the gasket to the roof?
Forum Discussion
Golden_HVAC wrote:
I worked on the emergency vehicles at my work with rooftop A/C units that where leaking. The gasket had compressed itself while it was parked, and now the bolts where loose. Like I could turn them 3 turns before they made contact with the inside frame of the A/C/ Then I tightened with a nut driver.
You can use a socket wrench and extension to make it easy for you, but do not "Tighten" beyond finger tight and about 2-3 more turns. Then check it again in a month or so, and snug it down a bit more if required. After 2 years, check it again.
The bolt is probably a 3/8" X 18 threads per inch. So each turn is 1/18" compression on the gasket. 2 turns = about 1/8".
Good luck,
Fred.
Dometic lists an actual torque value when you originally compress the gasket from it's 1" to 1/2" size and that is approximately 40 to 50 inch-lbs so you might use that value to retorque a gasket that is older.
That mumber is from the 6-03 579 installation and operating instructions.
Larry
