Installing a Temp/pressure Gauge
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Bob NH
In the Trades
Minimum disassembly, wet
You want to do this with minimum disruption to the operation. It is a "wet" change and you don't want to get scalded or soaked.
1. Turn off the electrical power to the boiler.
2. Close the make-up water supply to the boiler.
3. Manually open at least one zone valve.
4. Disconnect the "hot" lead to the circulator from the boiler control and connect power to it separately so the circulator runs. You are trying to cool down the water in the boiler. You may be able to do it without disconnecting the circulator from the controller but this is more certain. If you want to wait you can let it cool down naturally, but this is winter.
5. When it is cool enough to work without scalding yourself, disconnect the "jumper" from the circulator and reconnect the circulator to the controller. Don't turn on the power to the boiler.
6. Close all of the zone valves (or set thermostats to low temp to cause them to close) and any other valves in the circulator circuits. Remember all of them so you can open them when done.
7. Open the boiler drain and let it run until water stops coming out and pressure is zero. I would put the hose in a bucket of water to minimize getting air in the system. Leave the valve open to keep the pressure at zero.
8. Prepare your new Temperature/Pressure gauge with thread tape or pipe dope.
9. Cover the boiler control so it doesn't get soaked.
10. Put on a pair of fabric gloves covered with a pair of rubber or plastic gloves to protect yourself from the hot water. Rubber gloves must be on the outside.
11. Loosen the T&P gauge with a wrench. It is probably rusted in pretty good. Just before you remove it completely, close the boiler drain. This will minimize the flow coming out the opening where the T&P gauge goes.
12. Remove the T&P gauge. This is where you get a warm drenching.
13. Screw in your prepared T&P gauge and tighten it up.
14. Open the circulator circuit valves that you closed in Step 6.
15. Open the boiler make-up valve that you closed in Step 2.
16. Turn on power to the boiler.
There will be some air in the system but your air removal system should remove it.
You want to do this with minimum disruption to the operation. It is a "wet" change and you don't want to get scalded or soaked.
1. Turn off the electrical power to the boiler.
2. Close the make-up water supply to the boiler.
3. Manually open at least one zone valve.
4. Disconnect the "hot" lead to the circulator from the boiler control and connect power to it separately so the circulator runs. You are trying to cool down the water in the boiler. You may be able to do it without disconnecting the circulator from the controller but this is more certain. If you want to wait you can let it cool down naturally, but this is winter.
5. When it is cool enough to work without scalding yourself, disconnect the "jumper" from the circulator and reconnect the circulator to the controller. Don't turn on the power to the boiler.
6. Close all of the zone valves (or set thermostats to low temp to cause them to close) and any other valves in the circulator circuits. Remember all of them so you can open them when done.
7. Open the boiler drain and let it run until water stops coming out and pressure is zero. I would put the hose in a bucket of water to minimize getting air in the system. Leave the valve open to keep the pressure at zero.
8. Prepare your new Temperature/Pressure gauge with thread tape or pipe dope.
9. Cover the boiler control so it doesn't get soaked.
10. Put on a pair of fabric gloves covered with a pair of rubber or plastic gloves to protect yourself from the hot water. Rubber gloves must be on the outside.
11. Loosen the T&P gauge with a wrench. It is probably rusted in pretty good. Just before you remove it completely, close the boiler drain. This will minimize the flow coming out the opening where the T&P gauge goes.
12. Remove the T&P gauge. This is where you get a warm drenching.
13. Screw in your prepared T&P gauge and tighten it up.
14. Open the circulator circuit valves that you closed in Step 6.
15. Open the boiler make-up valve that you closed in Step 2.
16. Turn on power to the boiler.
There will be some air in the system but your air removal system should remove it.
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hj
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t&p gauge
1. turn off the power to the boiler.
2. turn off the water supply to the boiler.
3. trip the lever on the pressure relief valve to drop the pressure to zero. It will take a minute or so to drain the pressure out of the expansion tank.
4. unscrew the old gauge.
5. screw in the new gauge.
6. turn on the water supply
7. turn on the power.
Total time about 5 minutes.
1. turn off the power to the boiler.
2. turn off the water supply to the boiler.
3. trip the lever on the pressure relief valve to drop the pressure to zero. It will take a minute or so to drain the pressure out of the expansion tank.
4. unscrew the old gauge.
5. screw in the new gauge.
6. turn on the water supply
7. turn on the power.
Total time about 5 minutes.
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