rooftop charging in winter?

[rcac101]

Take a large plastic garbage bag and wrap it around the condenser. I usually let the fan hold it in place and charge the system its quick and easy.

[mikeacman]

They would probably do the same if you were caught with a control panel open and you didn't have your PPE gear on, but that never happens either does it.

you are correct

[meplumber]

Take a large plastic garbage bag and wrap it around the condenser. I usually let the fan hold it in place and charge the system its quick and easy.

Hard to find a big enough garbage bag for a Rooftop Unit. That trick works until it gets really cold.

[steve wright]

.....back in the day with r12 we had heaters(electric) that went on a 30# drum and Robinair (are they still in business) had a charging cylinder that had a heater in it.

But all that is a little over the top!

[54885488]

Carefully cycle outdoor fan motor by hand ?

[2sac]

5 gal bucket with hot water. 30 lb jug fits right in there.

[steve wright]

He has to weigh the charge in.

But I will use that cardboard to block the condenser

[gwoner]

Use your recovery machine and weigh in . Works every time

[mikeacman]

Use your recovery machine and weigh in . Works every time

3 votes for this so far ,,,,it's what I do ,,,,and by the time you dick around with cardboard and bags,fire ,hit water (we had a guy blow a jug up doing this ),having to drag them on/ off the roof ,dispose of it or save it ,,,its just as easy and probably faster to pump it in with your machine ...

[hands]

Using a recovery machine is a good option, but you should have it connected to your charging hoses and pull a good vacuum on it to remove any moisture first.

[tim79]

Wait till the spring or you will end up doing it twice.

[meplumber]

Wait till the spring or you will end up doing it twice.

Can't always wait till spring. What if the RTU cools a critical area? It is just something we have to deal with north of the Mason Dixon Line.