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Sounds like the switch is broken, one side of the switch is hot, make sure to turn off power before replacing the switch.

The 20 AMP breaker usually only rated about 80% of full capacity, therefore, the calculation is:

20 amp * 120 V * .8 = 1920 Watt

1920 /400 = 4.8

You are correct.

Sounds like the pressure is on the low side, is it easy to fill the system to 20 psi when cold and give it try.

At the end of the heating cycle, if the zone valve closed at the same time than it...

I don't think the smaller expansion tank causes the banging problem, it will increase the system pressure when heated, do you know what is the system pressure are when heated and when the system is...

Have you read the post below?

https://www.askmehelpdesk.com/heating-air-conditioning/loud-banging-noise-pipes-53625.html

Hope this help!

-1.5x <= -9/2, 2 ways to solve this problem, 1) Convert all values to decimal or 2) Convert all values to fraction.

1) -1.5 == -3/2 by substitution -> -3/2x <= -9/2
...

For electrical dryer, you require the following:

1) Cable from the panel must be rated for 30 AMP, i.e. #10 NMD90 copper, 3 conductors+ ground.
2) Outlet box size 4 11/16 X 4 11/16 X 2 1/8 inches...

What OS are you running?

The tray is usually located on the bottom of the refrigerator and next to the compressor, the drain pipe just somehow got outside of the tray.

I don't know how your system is setup, some system are connected to the house water supply, from the house water supply, connect to pressure reducer from 80 psi (city pressure) down to 30 psi and to...

On a typical hot water heating system, the pressure in the pipe is about 20 to 25 PSI, do you know what is the pressure in your system, if the pressure is too low, you can't bleed all the air out of...

Most of the electronic today takes both 110 and 220 v. To verify yours, take a look at the phone charger, there should be a line say input requirement, if it says "input 100-240v~", meaning that it...

Here is an example of a 200 amp main panel on the left and 100 amp sub panel on the right. Picture attached

Good Luck!

There is a timer in every auto defrost fridge, timer runs just like a clock, every cycle (24hours), there is a time (10 minutes), it would activate the Heater to melt the ice between the freezer and...

Is there ice build up on the fridge? The fridge is not defrosting?

Do NOT alter the original cable that came with the Cisco device, here is a link to explain a difference type of RS232 cables.

RS232 serial null modem cable wiring and tutorial

You mention that...

Your COM port is working, it seems like is your com port configuration, try to configure your com port to 9600bps, Data bits to 8, parity None, 1 Stop bit, and the flow control to Xon and Xoff. Is...

To test your serial com port, bring up your HyperTerminal, connect to that com port, usually COM1, connect a DB9 (I assume is a DB9) connector to the com port with the RX (receive pin 2) and TX...

It should not hurt your computer at all, as long as the output voltages are them same, such as the +/- 12 V, +/- 5V , etc.. the current draw from the power supply is depending on the input impedance...

This is very dangerous for people who perform service for the heater in the future, you have to make sure they turn off both breakers before any service work, if they get injure or kill, you may be...

Welcome to the wonderful world of Microsoft, sometime after you installed apps or patches, even you uninstalled them, they don't seem to go back to their original state due to some of the DLL were...

I think your old thermostat act just like a switch, when the temperature in the house fall below the setting, it will turn on to give a short circuit, and will turn off (disconnect) when the...

You never mention the type of computer you have, for example:

Type of CPU, type of operating system, how much RAM, how much Hard drive, what type of I/O card you have in the computer.

May be...

Sounds like your thermocouple in the furnace is on the edge of getting bad, you can replace it yourself or get plumber to do it for you. Home Depot is about $7.00 for the thermocouple.

Like I said in my original post, I am replacing the round thermostat with the Totaline P474-1100REC and wireless remote. Please refer the link below for Docs.

Thermostats USA - Totaline...

I've found GregN had the same problem as me back in Nov 2005. I've read the all the posts, I don't understand how he wired the P474-1100REF with the 2 wire from old round thermostat.

I've try the...