HVAC Surge Protector Installation

[Scottmcll]

I recently had an issue with my split-air HVAC system and with the VERY kind help of those here, was able to ferret out the problem was with blown circuit boards and it was recommended that I install a Ditek surge protector. Got it the other day, and while I'm 99% sure I've installed it correctly, I'd be most grateful if those, here, with corresponding experience would just have a look and confirm that it's right before I energize that circuit.

 

[Scottmcll]

Forgot to add the install illustration provided with the protector. Also, the line in from the panel is on the lower right. Line on the lower left is to the HVAC outdoor unit.

 

[Sponsor]

 

[Jadnashua]

It appears that the diagram has the surge suppressor connected to the outlet of the fuses, but it should work either location. If you had a big enough surge to blow the fuses, though, it would provide more protection on the a/c side of the fuses. I have a similar device wired into my power panel so that it protects the whole house. I still use individual devices on expensive items, though.

 

[Stuff]

As mentioned you wired the SPD on the line side and the drawing shows wiring it on the load side. There is a code issue with the double tapped lugs which is a common call-out on inspection findings. Unless you have something from the manufacturer that says otherwise the lugs on the disconnect are not rated for multiple conductors. Notice the drawing does not show any other wires under the lugs and the directions state "8. Connect the phase (Black) wires to the load side of a 2 pole breaker." This is how Ditek can say they did not tell you to break any rules. It is ugly but the proper way is to add splices so each wire is using a single lug. A fussy inspector could say even the ground bar is not listed for multiple wires.

 

[Fitter30]

Strange disconnect fed from the bottom line out the top?