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Drained system to change cylinder. re-filled but heating will not come on now is it air lock

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Connect hose to expansion pipe and blow through with main pressure, blockage should blow back into your storage tank, best of luck

Posted on Oct 31, 2009

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Posted on Jan 02, 2017

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How to remove airlock from hot water system


At the boiler should be a purge setup. This consists of a valve to shut the zone off, and downstream of that valve is a drain ****. Attach a hose to the drain ****, and with the boiler running, close the valve and open the drain ****. (Turn the heat up on one zone at a time if you have multiple zones.) You should be able to notice when the air comes out of the hose by hearing it and the hose twitches and jumps when large amounts of air come out. After the air stops coming out, open the valve , close the drain, flip the bypass closed, and let the water circulate, then reapeat procedure. Do this until you hear or see no more air. You can run a long hose outside or you can use a bucket and a short hose. Using the bucket allows you to actually see the bubbles of air, but you will be dumping many buckets before you are done. Most boiler feed valves have a fast fill lever that bypasses the slow 12 psi that the boiler is normally fed at. Using this will speed up the purge considerably, but don't forget to flip the lever back down between, and after purging or the boiler relief valve will blow off and make a mess. Good luck!

Mar 18, 2017 | Water Water Heaters

1 Answer

On a back boiler central heating system my hot water works fine but cant get my central heating working i have changed the pump there are no motorised valves on the system i have checked the the expansion...


Hi,
In most cases problems with the circulator pump boil down to two problems.
The most common is air in the lines causing an air lock.
The next problem is that the pump gets stuck and is not running even though itmay be hot and seem to be running. In this cause the pump can sometimes betaken apart, cleaned and it will work, but usually it needs to be replaced.

Here is a tip that I wrote that will explain circulator pump problems in moredetail.

Heating Circulating Water Pump Problems

heatman101

May 09, 2011 | Water Heaters

1 Answer

How to change heating element


Cut power off and take off cover to reveil element with number on it's side to give you info to get another one rated the same to go back in.
Make sure power supply is off to water heater and then turn water off to water heater. Then open a faucet's hot side and connect a water hose to drain and drain down water out of water heater to keep from getting water on floor. After heater is drained you are now ready to remove wires and element with a socket 1 3/8 "..

Replace new element in place and turn water back on and fill heater back up with all air out of system before cutting power on. Once air is out and water running from all facuet's hot sides throughout house now you can turn power back on.


One more thing when draining tank if it doesn't want to drain good open lever on relief valve to allow water drain faster.

Sep 26, 2010 | Rheem 30 GAL ELEC SHORT Water Heater 6YR...

1 Answer

Hot water does not last long. Model 82vh40-2 mnf. 05/2005


If the lower heating element burns out the upper element will heat the top part of the tank then shutoff. homw depot/lowes etc should carry elements. 1 turn off breaker, remove element access cover (the 2 panels on the front of the heater) test for electricity at the reset button ( uppermost device in upper panel) to make sure power is off. 2 turn off water (I usually turn off the cold water main to stop water cross feeding into hot supply line back into heater) 3 disconnect the 2 wires on the lower element, test with continuity tester. shhould be no continuity between terminals and tank, but around 10 ohms between the 2 terminals. Check the thermostat for continuity if tank is cold thermostat should be closed ie zero ohms across the 2 terminals.
If stat is bad replace stat; disconnect wires push it up out of the spring clip insert new stat reconnect. If element is bad: drain tank. connect garden hose to tank drain valve, open tank drain valve turn water main on to clear rust sediment and get water flowing. Next remove filter screen from a hot water faucet then turn on ( a hot faucet upstairs or higher than tank drain). Now turn water main off, air will now go in through hot faucet and tank will drain, takes about an hour. Use a water heater element wrench about$10 to remove element(s) make sure no bits of rubber gasket are left in element opening- dig em out with a screwdriver if needed. Insert new element with its gasket and tighten. reconnect wires DO NOT TURN ON ELECTRICITY! BE SURE TO FILL WATER HEATER WITH WATER ! Turn water main back on -air will come out of the hot faucet for several minutes. When water runs without any air sputtering, turn off faucet and replace the faucet filter screen. check element(s) for leaks. turn breaker back on.

Feb 17, 2010 | Rheem 40 GAL ELEC TALL Water Heater 6YR SC...

1 Answer

Noticed that pressure was low today on Greenstar 42CDi. Filled up to 1 bar only to see an hour later that it was back on zero. Turned heating off, blead all rads (some air released but no water??). Re...


there are air in the system let it out til you get water in the release outlet fil up to 1,5 or 2 bar no problems wil started also control the expan ballon for bilding and expanding the pressure

Dec 20, 2009 | Bosch Water Heaters

1 Answer

Central heating circulating pump


The vent pipe should be in front of the pump so that the pump pushes towards the vent pipe NOT sucks from it. I hope this vent pipe is part of the heating system and not of the hot water
Pumps like to push not pull and therefore it is better if the pump is located further down - say at the bottom of the cylinder or lower.
With an indirect cylinder, the hot water & heating are separate circuits and are not and must not be interconnected. You will need a separate pump for the hot water which should be taken from the hot pipe coming out of the cylinder. You may get vacuation in the cylinder - then you will need an Essex or similar valve to replace the hot water outlet connection
By the way - The pressure at any hot tap is directly related to the height difference between the tap and the header tank in the loft [thus a shower downstairs feels stronger than one upstairs]
rod_davies@hotmail.com



Sep 03, 2009 | Grundfos RCP-96 Recirculation Pump for...

2 Answers

No central heating back boiler


back boiler run from a gas fire? check the instructions to operate the gas heat to the back boiler not just the fire
I presume that this a fully pumped system - air lock doubtful There maybe on/off valves on the pipes to and from the back boiler [situate close to cylinder] make sure they are on - anticlockwise turn
or there could be a blockage in the outlet from header tank usually in the loft. or If there is no water in it maybe the mains cold feed it is off.
Note if no water in it DO NOT USE the back boiler

May 03, 2009 | Bosch & Power Vent Water Heater

1 Answer

My boiler needs cleaning. How do i clean it safley


You turn off the heat source, Attach a water hose to the drain at the bottom of the heater and drain it with supply inlet turned off. For it to drain faster, turn one of your tub or shower faucet, hot water side on so that the heater can get air. You can also pull up on the leaver of the T&P valve so that it can draw air from both sources just in case there is water trapped in the hot water side and it can't breath. After it is drained, you will leave the drain open and then turn the inlet supply back on and run for about 15 minutes. That should take care of it. Make sure that the heater is filled to capacity BEFORE turning the heat source back on.

Mar 30, 2009 | Water Heaters

2 Answers

Worcester bosch greenstar 25Si?30Si pressure gauge showing high


a couple of things , is your filling loop disconected ? , and are all your radiators blead from air, have you got a high point where the air can get stuck in system say pipes going into roof etc you may need to fit a air release valve in line at highest point to remove the air from system , your boiler should be around 1.5 bar running preasure average setting . if you are constanly filling with water you could be exceeding the pressure valve limet which releases pressure from system this could be faulty ?

Feb 02, 2009 | Water Heaters

2 Answers

Upstairs rads r cold appears to be no pressure 2 vent rads


you have air lock in top floor rads must bleed it out start with the one closest to boiler and work your way out to what you figure is the end of line as best you can figure

Dec 03, 2008 | Water Heaters

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