Heat Exchanger Failure # 4 – Firing Rate.

Flame gasHow can firing rate affect heat exchanger longevity?
If the firing rate is too low, its that same as having low return air temperatures (RAT). Condensation will form, mix with the flue gas and cause corrosion.
A high firing rate is the same as low air flow; the heat exchanger will run hotter than designed, and will eventually crack.
How do you check the firing rate?

Firing rate is determined by manifold pressure, BTU content of the fuel, and orifice size. We’ll be covering those topics in another post.

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Heat Exchanger Failure #3 – Air Flow.

airflowHow can air flow cause a heat exchanger to fail?

Too much airflow causes the heat exchanger to run cool causing condensation to form inside, and if you read the previous articles you know what that means.

 

(If you don’t, then read Heat Exchanger Failure #2 and #3…)

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Nothing says winter has arrived like a failed heat exchanger…- Part 2; the RAT.

No, not the four legged, scurrying around a vacant warehouse type rat. RAT as in Return-Air-Temperature, or more specifically, low return air temperature.

How does low RAT kill a heat exchanger? It cools the heat exchanger, causing the flue gas temperature to drop below its dew point.

Sound familiar yet?

The moisture mixes with the flue gas and forms acid, and the acid causes corrosion. Yup, you got it; it’s just like the oversized unit from the first post.

So, what causes of low RAT?  I’m glad you asked!

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98 degrees and 100% Stupidity

“Fake it till you make it” said none of the best technicians ever…

Commit these two truths to memory-

“Confidence without knowledge is dangerous”
and
“Knowing what you don’t know is power”

There are some folks out there who are just plain dangerous. The unfortunate part is most have no idea how dangerous they really are, and this makes them even more dangerous.

What makes them dangerous?

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Nothing says winter has arrived like a failed heat exchanger…

Nothing says winter has arrived like a failed heat exchanger…

In the next few weeks a lot of you will be knee deep in failed gas heat exchangers; it’s our industry’s way of letting you know winter is here.

From residential furnaces to commercial rooftop units and hanging unit heaters; non are immune to the infamous failed heat exchanger.

Some will rust through, others will crack, and some will be packed with soot.

Some of you will replace the victim (yes, I said victim) and move on to the next job, never giving the components early demise a second thought.

You’ll blame the failures on ‘thin metal’, ‘ foreign materials’ or ‘bad design’.

Unfortunately heat exchangers are like everything else in our industry; few die of natural cause, most are murdered.

At the top of our Heat Exchanger Serial-Killer list is Mr. “Bigger is Better”

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80% of Sales Happen after 87% of Sales People Give Up

  • 2% of new business sales are made on the 1st contact
  • 3% of new business sales are made on the 2nd contact
  • 5% of new business sales are made on the 3rd contact
  • 10% of new business sales are made on the 4th contact
  • 80% of new business sales are made on or after the 5th  contact

You didn’t fail to book the meeting because you pitch wasn’t slick enough or the color of your business card.

A slick sales presentation of an incredible PowerPoint has never lost (or won) a sale.  Your solution can perfectly solve a problem or increase sales and profits, but this is never enough to close the sale.  Solutions are great and profits are even better, but neither means anything without a feeling of trust.  The main reason the B-to-B sales cycle takes so long is that trust takes time

We begin building trust with familiarity.  The first voicemail, or the first time you meet with a decision maker, is just that, the first time.  Contact builds familiarity and familiarity build trust.  Each voicemail, thoughtful email or short pop-in visit is a chance to build familiarity and trust.

Prospecting is part of closing a sale

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Calming down an angry customer by listening

As a sales rep, manager and a business owner, I’ve often had to tell a customer something that they didn’t want to here.  Sometimes, it simply is was it is.

  • The part is out of stock.  
  • We double booked.  
  • What you’re are asking for simply isn’t possible.  
  • We screwed up and it’s going to take 4 days for us to fix it.  
  • The supplier screwed up.  

Whatever it might be.

Sure, it is always better to give the customer what they want but, what do you do when you can’t?

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TECHNICAL LANGUAGE TRANSLATOR

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Zen’s take on the Fluke T6-1000: It’s the Shiznick

A non-contact fork style meter that measures voltage and amperage at the same time. WHAAAT?

Check it out and tell ’em the folks at ZenHVAC sent you. (Note: this and two-fifty may get you a coffee…not a latte, grande, crappy, frappe coffee…just a plain old medium coffee coffee…maybe…ok, never mind about the whole coffee thing…,just check the meter out.)

http://en-us.fluke.com/products/electrical-testers/t6-1000-electrical-tester.html

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I only work on….

 

 

Zen’s thought of the day:

“I only work on boilers”
“I only work on chillers”
“I only work on……”

 

Here’s what we have to say about the “I only work on” mindset-

“Your an expert on one? You’re valuable to one”
“You’re an expert with two? You’re valuable to a few”
“You know them all? You’re the one they’re gonna call”

Your specialty may be boilers, chillers, rooftops, whatever. But always remember; chillers and boilers won’t accomplish squat without pumps.

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