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How a Hotwater Natural Gas Boiler Works - Overview

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Language: en

00:00:01.280
okay so I'm going to talk about
00:00:03.110 00:00:03.120 troubleshooting a hot water boiler so
00:00:09.200 00:00:09.210 I'll just go over the parts the yellow
00:00:12.350 00:00:12.360 hose here is for natural gas that comes
00:00:14.570 00:00:14.580 in this is a natural gas-fired boiler
00:00:17.019 00:00:17.029 this is the off switch for the gas so
00:00:21.230 00:00:21.240 you can turn that 90 degrees and it
00:00:23.240 00:00:23.250 shuts off the gas the power switch for
00:00:27.859 00:00:27.869 the boiler is right here kind of make it
00:00:34.010 00:00:34.020 out
00:00:38.100 00:00:38.110 this is the boiler this is the indirect
00:00:41.820 00:00:41.830 fed hot-water tank these are the loops
00:00:47.420 00:00:47.430 the pumps I should say for each heating
00:00:51.750 00:00:51.760 or hot water I guess loop so the pipe so
00:00:57.000 00:00:57.010 it basically completes a loop all the
00:00:58.799 00:00:58.809 way up through the house for the hot
00:01:00.090 00:01:00.100 water I mean the heating and then it
00:01:02.640 00:01:02.650 returns and feeds back into the boiler
00:01:04.260 00:01:04.270 where the water gets reheated same with
00:01:06.600 00:01:06.610 the domestic hot water it feeds into
00:01:08.460 00:01:08.470 this indirect fired hot water tank
00:01:11.120 00:01:11.130 cycles through there's a coil inside and
00:01:13.560 00:01:13.570 then it comes back through and gets
00:01:15.420 00:01:15.430 reheated so that's why they call it
00:01:17.640 00:01:17.650 indirect it's heated indirectly by the
00:01:19.950 00:01:19.960 hot water that this boiler produces this
00:01:24.150 00:01:24.160 is the pressure gage normally it should
00:01:28.889 00:01:28.899 be between 12 and 15 psi anything below
00:01:32.700 00:01:32.710 that is not good
00:01:35.280 00:01:35.290 it can cause cavitation in these
00:01:37.830 00:01:37.840 impellers which can wear down the
00:01:39.749 00:01:39.759 impellers and also if there's no
00:01:42.120 00:01:42.130 pressure the boiler won't run and also
00:01:44.480 00:01:44.490 it decreases your boiling point of the
00:01:47.899 00:01:47.909 water in the system this guy here is the
00:01:55.050 00:01:55.060 pressure tank what that does is when
00:01:59.219 00:01:59.229 water heats up it expands there's a
00:02:01.530 00:02:01.540 diaphragm in this and it takes up
00:02:03.710 00:02:03.720 basically it takes up the slack of the
00:02:06.600 00:02:06.610 hot water so when hot water heats up it
00:02:08.580 00:02:08.590 expands it'll go into this tank
00:02:09.870 00:02:09.880 diaphragm stretches it maintains the
00:02:12.420 00:02:12.430 pressure in the system when the pressure
00:02:14.759 00:02:14.769 cools down the diaphragm well the hot
00:02:17.759 00:02:17.769 water losses I guess it it shrinks and
00:02:22.259 00:02:22.269 then it comes back up meanwhile keeping
00:02:25.620 00:02:25.630 pressure in the system so very important
00:02:27.960 00:02:27.970 if this malfunctions
00:02:32.290 00:02:32.300 this pressure release valve over here
00:02:35.200 00:02:35.210 will go off so you'll see a puddle of
00:02:38.020 00:02:38.030 water down at the bottom here these are
00:02:44.860 00:02:44.870 the zone valves so this is for the
00:02:46.810 00:02:46.820 heating loop there's four zones and
00:02:49.300 00:02:49.310 they're labeled
00:02:50.560 00:02:50.570 the main the second floor of the den in
00:02:52.930 00:02:52.940 the bathroom what happens is when you
00:02:56.590 00:02:56.600 call for heat from the firmest at in any
00:02:59.860 00:02:59.870 one of the zones this switch will move
00:03:03.250 00:03:03.260 over and basically what's inside is
00:03:06.100 00:03:06.110 there's a motor so this is an electrical
00:03:08.830 00:03:08.840 mechanical valve this motor will turn on
00:03:12.670 00:03:12.680 and will open this valve and when this
00:03:16.090 00:03:16.100 valve opens it lets hot water go through
00:03:18.250 00:03:18.260 the system also at the end there's
00:03:22.960 00:03:22.970 something called an end switch this
00:03:25.120 00:03:25.130 valve will open and there's a little
00:03:26.980 00:03:26.990 micro switch here and an arm hits the
00:03:29.770 00:03:29.780 switch telling the boiler to turn on and
00:03:32.380 00:03:32.390 I'll demonstrate that with this wire up
00:03:36.850 00:03:36.860 at this manifold it jumps I should say
00:03:40.270 00:03:40.280 terminal it jumps I can jump the to the
00:03:45.100 00:03:45.110 end switch so if I were to do this we
00:03:49.060 00:03:49.070 hear the boiler come on
00:03:55.570 00:03:55.580 there you hear fire up and then the
00:03:59.780 00:03:59.790 temperature will stop going up I'm going
00:04:02.270 00:04:02.280 to remove it shuts off and basically all
00:04:06.440 00:04:06.450 I'm doing with this wire is I'm
00:04:07.760 00:04:07.770 simulating a thermostat okay so common
00:04:14.390 00:04:14.400 issues if one of these valves if we
00:04:19.970 00:04:19.980 don't get heat upstairs what can happen
00:04:21.740 00:04:21.750 is this valve the end switch could be
00:04:24.170 00:04:24.180 bad or the motor itself isn't working
00:04:28.000 00:04:28.010 another common problem is with these
00:04:30.410 00:04:30.420 throw a fault code on this panel here
00:04:33.320 00:04:33.330 it'll throw some type of code you can
00:04:36.170 00:04:36.180 reset that by hitting either reset or
00:04:39.470 00:04:39.480 shutting it off you might have to do
00:04:41.180 00:04:41.190 both now sometimes jurors also I've had
00:04:46.550 00:04:46.560 happen an error code with low pressure
00:04:48.820 00:04:48.830 the boiler is smart enough to know that
00:04:50.990 00:04:51.000 if there's low pressure not to operate
00:04:55.570 00:04:55.580 up here is water feed valve what it's
00:05:02.720 00:05:02.730 supposed to do it's supposed to be an
00:05:04.070 00:05:04.080 automatic water feed but I think this
00:05:05.900 00:05:05.910 one is stuck so that it's not feeding
00:05:08.810 00:05:08.820 automatically at a certain amount of
00:05:10.580 00:05:10.590 pressure it's supposed to be set at a
00:05:12.470 00:05:12.480 certain pressure but regardless if this
00:05:15.830 00:05:15.840 valve at this this gauge here leads
00:05:19.580 00:05:19.590 below this blue one up here if it reads
00:05:23.570 00:05:23.580 and it's touching this little bar here
00:05:26.500 00:05:26.510 so right now we're at like I think 12
00:05:28.820 00:05:28.830 psi if it's touching this bar and if
00:05:31.010 00:05:31.020 there's no pressure and that might throw
00:05:33.230 00:05:33.240 fault code over here I'm not sure why it
00:05:36.140 00:05:36.150 happens it has happened a couple times
00:05:37.910 00:05:37.920 since I've changed this pressure tank I
00:05:40.730 00:05:40.740 did we did have an older one it didn't
00:05:42.770 00:05:42.780 work right but since we changed it to
00:05:44.870 00:05:44.880 that one it seems to work fine now but
00:05:47.480 00:05:47.490 should that pressure drop for whatever
00:05:49.670 00:05:49.680 reason you can feed it using this up
00:05:53.360 00:05:53.370 here there's a little switch right here
00:05:59.340 00:05:59.350 I don't have enough light but push up on
00:06:03.120 00:06:03.130 it you can hear it feeds water into the
00:06:07.590 00:06:07.600 system and builds the pressure back up
00:06:09.020 00:06:09.030 if you do that come over here and look
00:06:11.880 00:06:11.890 at the gauge to see what the pressure is
00:06:13.230 00:06:13.240 at just raise it until it's above 10 psi
00:06:16.800 00:06:16.810 and the boiler should fire back up if it
00:06:20.310 00:06:20.320 doesn't hit the reset button or powered
00:06:23.610 00:06:23.620 it off or Diouf both so other than that
00:06:29.790 00:06:29.800 that's about the about everything with
00:06:34.050 00:06:34.060 to do with troubleshooting the simple
00:06:36.120 00:06:36.130 things this is the power the main power
00:06:39.690 00:06:39.700 for it so if you shut this off it shuts
00:06:42.150 00:06:42.160 off the powers of the whole system
00:06:45.590 00:06:45.600 this is a transformer used for it's a
00:06:51.120 00:06:51.130 low voltage trend AC transformer used
00:06:53.040 00:06:53.050 for these zone valves and also connects
00:06:55.980 00:06:55.990 up to the it can be used to connect up
00:06:58.770 00:06:58.780 to the thermostat but in our case it's
00:07:00.960 00:07:00.970 used just for these own valves so that's
00:07:02.640 00:07:02.650 what causes those motors to turn when we
00:07:04.860 00:07:04.870 call for heat up in the thermostat and
00:07:11.160 00:07:11.170 the last thing actually one other thing
00:07:13.170 00:07:13.180 is down here we can't see very well
00:07:16.110 00:07:16.120 because the light but down here is a
00:07:18.300 00:07:18.310 condensation pump so if this container
00:07:20.250 00:07:20.260 overfill but there might be something
00:07:23.790 00:07:23.800 wrong with the pump and you just need to
00:07:25.980 00:07:25.990 bail that out every once in a while it
00:07:27.870 00:07:27.880 usually only happens during the winter
00:07:29.340 00:07:29.350 when the pot when the boilers on a lot
00:07:31.320 00:07:31.330 and it causes a lot of condensation okay
00:07:35.480 00:07:35.490 that should just about cover it
00:07:37.860 00:07:37.870 there's no reason to ever really enter
00:07:39.570 00:07:39.580 inside here because there's nothing in
00:07:41.280 00:07:41.290 it
00:07:42.410 00:07:42.420 you can service for for troubleshooting
00:07:46.050 00:07:46.060 least not the that would face that with
00:07:48.510 00:07:48.520 just the basic knowledge better to call
00:07:50.280 00:07:50.290 someone and then again and letter
00:07:54.750 00:07:54.760 pressure release valve right here which
00:07:56.190 00:07:56.200 feeds down so if this gets too hot this
00:07:59.070 00:07:59.080 valve will go off

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