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If your expansion tank is full of water will it make the blow off valve trip on your furnace when it starts up?
Wiki User
∙ 14y ago
yes, because there is no room for expansion and if your pressure is close to 30lbs or goes over it will cause your reliefe valve to dump to prevent overpressure of system
Wiki User
∙ 14y ago
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Can you turn the main water off and leave your furnace on?
This depends on the type of furnace system you have. A forced-air furnace should be completely independent of the water system. An older, convection-based (no pump) hot water system will have an expansion tank, and will not need to have the main water on, except to replenish the system, which should happen infrequently. A closed-loop system could possibly over-pressurize as the water is heated, with the mains valve closed, and would trigger the pressure relief valve, dumping a few cups of water every time the furnace cycles until the system was dry; eventually, with the pipes in the furnace dry, the furnace heat would melt and destroy them.
How do you know the bladder in a hot water heating system is good?
If the bladder is bad in your expansion tank the tank will fill with water. When this happens the pressure in your furnace will exceed 30lbs and your pressure relief valve will blow off.
Where is the expansion valve on a 98 Honda Accord?
The expansion valve, on your 1998 Honda Accord, is located just before the thermostat housing. You can follow the water hose from the radiator to the expansion valve.
What to do if your furnace keeps blowing water out of the relief valve?
Nothing as a furnace is scorhed air a BOILER is either water or steam and "Relief Valves" are for liquid thus either you have a boiler or your furnace is being flooded from an outside source
How do you test a 2000 grand prix gt expansion valve?
An automotive expansion valve can be tested by putting it in ice water. The sudden drop in temperature will cause a valve that is working properly to close. If the valve s faulty it will remain open.
When you have hot water coming out threw the top blow off valve what does these mead?
Blow off valve faulty or expansion tank needed at water heater.
Why would the water heater cold water supply and the hot water exit both be hot?
There should be a non return valve on the cold water side of the hot water tank. When there is no non return valve the water in the tank heats up and expansion of the water will cause it to travel backward up the cold water pipe thereby equalising the waterpressure normally this expansion would find its way out of the safety pressure valve. So it sounds like the non return valve needs fitting or replacing.
Is it necessary to have both an expansion tank and a pressure relief valve on a hot water heater?
You must have a pressure relief valve. I believe it is code nationally. I don't think you can buy a hot water tank w/o one. Expansion tank needed also if water meter has backflow preventer, check with local water authority if it does.
Can you hook up and rely on the Temperature Pressure Relief valve for a new electric hot water heater to a drain or do you really need an expansion tank?
Depends on your code. If you have a PRV or, as you would say, pressure reducing valve on your water supply to your house, you need an expansion tank. If your pressure is above 80 psi, you need a PRV AND an expansion tank.
Water temp and elements for hot water heater seem fine. Why is water heater discharging water through pressure valve usually after extended hot water use?
One possible reason for the temperature/pressure (tp) valve to start leaking may be from expansion of the water as it is being heated if there are check valves in the water system this is sometimes the culprit .In most water systems there is plenty of room for expansion in the distribution piping and service line and private well systems have a pressure tank that can absorb the expansion. You may have to add a small expansion tank to the water piping at the heater to solve this problem. hope this helps. Bob
What should the hot water furnace water pressure be?
A furnace does NOT have water... A boiler has water .. NICE trick question
What causes a pop off valve leak on hot water tank?
If you have an expansion tank in the water line near the hot water tank there may be a small plastic cover over a valve that looks like it is an air valve from a tire/tube. If you depress it and water comes out it means the tank inner membrane is compromised. Replace the tank. Home Depot has them. They're about 3 or 4 gal and adequate for a typical home situation. The pressure relief valve leaks because when you use the hot water it comes out of the hot water tank and is replaced with cold make-up water from your water supply. As it heats up it expands. Since the expansion tank is full due to the leaking membrane in the expansion tank, the expanded water goes out the expansion valve til the pressure is equalized. I put a small catch pan under it til I could replace the exp. tank. Be careful when you remove it(mine was simply screwed into a fitting in the water line) the tank as it will be heavy and awkward. Goog luck.
