Hydronic heating Mystery?

Question

I rent a place with hydronic heat.
Gas furnace, single pipe loop with radiators
tapped off, cartridge type circulator pump.
The pump became noisy, and the system was
'short cycling` and not heating effectively.
No air when bleeding the radiators.
Thinking the problem was the circulator, I
drained the system and checked the pump.
It looked fine, so I refilled the system and turned
it back on. It now works properly.
Why?????

Lawnrider;That's what I thought.
Pump is on a horizontal pipe which I checked
for debris.
Rob K. Looks like you take the cookie.

Answer 1

Sounds like your air, or expansion tank was water logged and your drain and refill was just what it needed. Just do it again as needed because sometimes that kind of thing just happens. If it happens to often then you need to replace the expansion tank with a bladder tank and that should solve the trouble once and for all.

Answer 2

it is kinda humorous,,,, greater beneficial get ya a sparkling plumber,,, needless to say not put in to many boilers,, he has finished one million of to issues,,, the 1st and maximum possibly project ,, the water furnish comes into the boiler and is assume to ha a examine vale in it so as that the boiler will call for the water whilst it desires it , and he has additionally piped back into the warm water furnish inflicting the topic, creating an entire circles, and once you turn on the water it makes a loop in the process the finished device after which out the faucet, ,,, could get this mounted, carry the plumber or installer in charge and cause them to restoration it,,, lol desire this facilitates ya,,, the fewer straight forward project is a failed examine valve,,, even though it would nevertheless could be piped incorrect for this to ensue,,,stable good fortune,,,,,oh i merely concept-approximately one possibility that would make this a ultimate placing up, is he employing this for his warm water and warmth, if he does not have a separate warm water heater , then possibly it grow to be designed to be his warm water and his warmth, yet nevertheless there could be thermostat zone controls to each room in the residing house so as that water cant make it to the warmers till the t-stat is grew to become directly to that heater, so examine those opportunities, there's not something that is, stable good fortune

Answer 3

You may have also had debris lodged in the pipe, or at the pump and it was dislodged when you drained it.

Answer 4

Entrained air can cause airlock in a system.