Search: Posts Made By: hesaidshesaid
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12-17-09, 12:58 PM
Replies: 13
Views: 2,640
Posted By hesaidshesaid

Now that you are conversant with duty cycles, you...

Now that you are conversant with duty cycles, you can right-size your next furnace using Excel.

Your furnace puts out 100,000 BTU/hr and you pick several typical winter days, and you get readings...
12-17-09, 07:42 AM
Replies: 13
Views: 2,640
Posted By hesaidshesaid

Duty cycle: if your furnace puts out 1...

Duty cycle:
if your furnace puts out 1 therm/hr, and you only need 0.7 therm/hr because of the weather, it needs to be on 70% of the time.

With an on time of 10 minutes, the off time would be 4.3...
Replies: 19
Views: 5,807
Posted By hesaidshesaid

With your regulator, as long as the V/I relay is...

With your regulator, as long as the V/I relay is not pulled in, the gen. should be putting out its maximum.
During operation the relay armature flutters, continually adjusting the output voltage...
Replies: 19
Views: 5,807
Posted By hesaidshesaid

Did you do the no-charge test on page 7.10 of the...

Did you do the no-charge test on page 7.10 of the manual?

You have the electromechanical regulator, with a cutout relay and voltage/current regulating relay? Most of the schematics don't seem to...
Forum: Water Heaters
12-16-09, 06:54 AM
Replies: 13
Views: 8,010
Posted By hesaidshesaid

Here's my samples for replacement age in years. ...

Here's my samples for replacement age in years. Wearout age is greater than or equal replacement age.

3
5
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10
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11
Replies: 14
Views: 1,135
Posted By hesaidshesaid

If they're truly outliers, I'll chuck 'em. ...

If they're truly outliers, I'll chuck 'em.

"In the case of normally distributed data, roughly 1 in 22 observations will differ by twice the standard deviation or more from the mean, and 1 in 370...
Forum: Water Heaters
12-15-09, 08:35 PM
Replies: 13
Views: 8,010
Posted By hesaidshesaid

90% of NG WHs last longer than this.:(

90% of NG WHs last longer than this.:(
Replies: 25
Views: 1,311
Posted By hesaidshesaid

But the water can't go anywhere except through...

But the water can't go anywhere except through the pipes. . .?
Replies: 13
Views: 1,345
Posted By hesaidshesaid

You could make a sequencer to switch each battery...

You could make a sequencer to switch each battery onto the charger, in turn. ~$20 in parts.
Replies: 4
Views: 707
Posted By hesaidshesaid

Post a schematic. We'll step you through it. ...

Post a schematic. We'll step you through it. Set aside a whole day and warm up your test instruments.
12-15-09, 06:29 PM
Replies: 8
Views: 7,842
Posted By hesaidshesaid

A 555 timer, relay, circuit board, $5 from...

A 555 timer, relay, circuit board, $5 from Hosfelt.com, but shipping is extra and so is a box for this device, a day's labor to assemble, test, debug.
12-15-09, 04:05 PM
Replies: 1
Views: 688
Posted By hesaidshesaid

Assuming 100% efficiency, 1 Therm of energy can...

Assuming 100% efficiency, 1 Therm of energy can be had from approx. 0.71 gal of fuel oil, 29 kwh of elec heat, 8.4 kwh of heat pump heat (COP = 3.5), 4.2 kwh of heat pump heat (COP = 6.9)

What do...
Replies: 14
Views: 1,135
Posted By hesaidshesaid

Depends if they cluster or not when you do a dot...

Depends if they cluster or not when you do a dot plot of the bids

...a....bcd..e....f
0.....|.....|.....|.....
relative price..$

In the example, a & f are outliers and the true cost for doing...
Replies: 6
Views: 3,355
Posted By hesaidshesaid

Some fluors won't start properly w/o a ground.

Some fluors won't start properly w/o a ground.
Replies: 14
Views: 1,135
Posted By hesaidshesaid

It depends on what level of detail and certainty...

It depends on what level of detail and certainty you want.
The median US household income is about $50k. Quoted prices depend somewhat on median incomes by ZIPcode
ZIPskinny - Get the Skinny on...
Replies: 5
Views: 784
Posted By hesaidshesaid

Yeah, but I don't get why hi speed stops the...

Yeah, but I don't get why hi speed stops the compressor. The OP might also have a ground problem.
Replies: 14
Views: 1,135
Posted By hesaidshesaid

So, I guess you don't have any to add. . .??? ...

So, I guess you don't have any to add. . .???

Well. . .it's a work in progress. . .

It took me a year to get ~70 samples of HVAC replacement ages, and with a sample this large and some of...
Replies: 7
Views: 1,250
Posted By hesaidshesaid

Sorry, I should have said ". . . your Alternating...

Sorry, I should have said ". . . your Alternating Current power supply. . ."
Replies: 9
Views: 12,295
Posted By hesaidshesaid

From the product photo, it doesn't look like the...

From the product photo, it doesn't look like the brushes are accessible without taking the mixer apart.

In fact, call Sunbeam and see if they will even sell replacement brushes to someone 'not in...
Replies: 7
Views: 1,250
Posted By hesaidshesaid

Your AC power supply may have an upstream bad...

Your AC power supply may have an upstream bad [high resistance] connection that prevents the motor from getting its rated voltage when it needs it.
12-14-09, 04:54 PM
Replies: 13
Views: 2,640
Posted By hesaidshesaid

Probably less than 10 min. "on" time is short...

Probably less than 10 min. "on" time is short cycling.
12-14-09, 04:50 PM
Replies: 11
Views: 6,875
Posted By hesaidshesaid

You may not get a long lifetime for your tubes in...

You may not get a long lifetime for your tubes in this kind of a cycling on and off application.
Also, you need tubes that start in cold weather.
Replies: 12
Views: 1,654
Posted By hesaidshesaid

Depending on how old it is, it might be a bad...

Depending on how old it is, it might be a bad solder joint. This could be a safety problem.
Replies: 9
Views: 12,295
Posted By hesaidshesaid

If it has brushes, find them and replace them. ...

If it has brushes, find them and replace them.
http://www.fussybrush.com/images/FussyBrush-10.jpg
They rub up against the commutator.
12-14-09, 01:47 PM
Replies: 4
Views: 2,537
Posted By hesaidshesaid

Post a photo or scale drawing.

Post a photo or scale drawing.
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