I found that the HVAC systems were shutting down because the float safety switch. I spoke with the client about his different options and he chose the hf3a and didn't want the option for me to clear out the emergency drain pan of water. I did not have ions and valves on the truck which I would usually install on the drain lines because they run together. So I cut both lines and capped them off when I was blowing them out. I then cleared both lines and made sure they were draining. After I cleared the drain line the sink got clogged up. We tried to clear but were not successful. Client is going to get some chemicals to clear the drain line. Client may also call to get an estimate to get the unions and valves installed so he can clear the drains him self.