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Back in the days of R11 I used a small, one-piece pump that I believed was intended for "pool duty". It had a direct drive rubber impeller. It worked fine until R123, and its lower pressure, appeared on the scene.The vacuum in the oil sump was to great for that pump to overcome. Then I bought the smallest coupled gear pump (and motor to drive it) that I could find in Grainger's catalog. In 25 years those were the only pumps I used for that purpose. Although that little pool pump got to where it would sometimes spark pretty good while running! lol, ahhh, good times.
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I might have a co-worker who uses a gear pump off of a generic small oil burner. He may connect it with a standard 1/2" drill and whatever fittings that are necessary. Of course I can't recommend this type of home made contraption but it seemed to work well enough from what I've seen. It easily overcomes the vacuum on a low pressure chiller.
...Ron
Roof Rat
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Find a good Industrial oil fired boiler thats being demoed and if there is one piece of salvage that you want its the gear pump for that boiler the rest is up to you to modify it to your personal spec's.
A mind is like a parachute. It doesn't work if it is not open.
The best part of going to work is coming back home at the end of the day.
Hard work spotlights the character of people: some turn up their sleeves, some turn up their noses, and some don't turn up at all.
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Thanks, guys. I'm in Oklahoma, where natural gas is king. I've never personally laid eyes on an oil-fired anything. I will likely buy both a pump and portable heater, both are good to have and the boss is willing to buy whatever I need. I appreciate all your input.
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providing that the chiller is off?
just turn the chilled water pumps on for a while!
i accidentally left a pump in hand last night to a 410a chiller.
went back this morning and here is the result!
true knowledge exists in knowing that you know nothing. 
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If you've got a big domestic water boiler and storage tank near the chiller, you can run some hoses from that tank, in and out of the chiller, and right down the drain. Don't need any more than 2-3 GPM flow.
The key to happiness is lower expectations.
Don't pick the fly crap out of the pepper.
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 Originally Posted by supertek65
providing that the chiller is off?
just turn the chilled water pumps on for a while!
i accidentally left a pump in hand last night to a 410a chiller.
went back this morning and here is the result!
Did it pop the relief valves?
The key to happiness is lower expectations.
Don't pick the fly crap out of the pepper.
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somehow it did not???
may be because the position of the 3 way valve while not in mechanical cooling?
i had one chiller valved off.
then again maybe it did?
luckily they are small chillers with MDX condenser coils so they dont hold much 410a if it did blow!
Originally Posted by Tech Rob
Did it pop the relief valves?
true knowledge exists in knowing that you know nothing.
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big old blankies? they warm me up just fine.
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