How to Fix Pressure Issues in a Ground Source Heat Pump

What You'll Need
Empty Bottle
Bicycle Repair Kit
Replacement Valve

If you have a ground source heat pump then you will need to ensure that it is working properly. One problem which any owner of these ground source heat pump devices knows is the loss of pressure. This loss of pressure may be caused by a number of different problems, ranging from minor problems with kinking in the coils of tubing to problems with the valve system that circulates the liquid. In order to get the ground source heat pump back to normal, you will have to resolve these problems quickly. You may find that fixing it is not difficult, but is very time consuming.

Step 1 - Finding the Source

If your ground source heat pump has been losing pressure, then the only real option that you have is to try and fix it as quickly as possible. This means digging up the coils of tubing. When you have dug them up, you should lay them out on the ground, and detach them from the heat pump. Take an empty bottle, and inflate it full of air, which you should then push into the tubing. Follow the air around to find the leak which is causing you to lose pressure.

Step 2 - Fixing the Coil

You may find that the major cause of loss of pressure in the ground source heat pump is due to kinks forming in your coils. These kinks occur where the tubing folds in on itself, and prevents air and fluid from moving around the tubes in a regular manner. This limited movement will cause a drop in the pressure in some areas. Fix this problem by either uncoiling the tubes and then smoothing out the kink, or replacing the tubing, if the kink is too serious to repair.

Step 3 - Repairing a Leak

You may also find that a drop in pressure is caused by a leak in your ground source heat pump. This leak is often the result of areas of the tubing becoming kinked, leading to small perforations forming along the crease. You should be able to repair this easily using a simple technique. Take your bicycle repair kit, and place it over the leak in your tubing. Fix the tubing as though it were a deflating tire, and then replace it in the ground.

Step 4 -  Replacing a Valve

If the problem lies with one of the valves around your tubing, then you will probably need to replace this, rather than attempting to repair it. Cut off the old valve close to the end of the tubing, so that you have a fresh piece to work with, and then replace it with a new valve. Push the end of the valve into position in the tubing, and then add a layer of caulk around the edge of the tube. This will help to prevent air from escaping through the gap between the tube and the valve. You can now place the tubing back in the ground, and cover it over with soil.