Walk-in freezer Fans wtf.

[akelesis]

Just a thought this is all too much to take on right now gotta read and understand this stuff i dont want to cost a customer another unnecessary cost. how do i know that a defrost clock is defective?

[indy2000]

You get the site, you walk around and look at the eqipment, then you write down the make, model, and serial number.

Is it in refrigeration or defrost, then from that you troubleshoot.

You found a frozen coil, you try to de-ice it by initiating defrost, you find it terminates upon initiation.

what type of clock?

[pecmsg]

Heatcraft.pdf

Just a thought this is all too much to take on right now gotta read and understand this stuff i dont want to cost a customer another unnecessary cost. how do i know that a defrost clock is defective?

Start Reading

[jpsmith1cm]

Just a thought this is all too much to take on right now gotta read and understand this stuff i dont want to cost a customer another unnecessary cost. how do i know that a defrost clock is defective?

Simple test.

BEFORE you touch the timer wheel, take a sharpie and mark the inner wheel of the timer inline with the time arrow.

Wait 5 minutes.

You'll know.

[Jared Fetter]

The first thing I like to do when suspecting defrost timers, is grab a sharpie and make a tiny mark around the minute knob on the timer. (to mark current time/position)

I do this before I even so much as touch that knob.

Then I come back in ~5 minutes and see if the knob has advanced any time.

If it has moved -> Good. Advance it to the next defrost cycle and move on to other things.
If it hasn't moved -> Bad. Replace timer.

(What this checks is both the timer motor itself, and also the clock gearing which can get hard to turn after years of dirt, and eventually lock up.)

As has been stated, it sounds like you replaced a timer that was maybe fine because the Defrost Term switch is bad and threw you for a loop. Chalk it up to experience and don't do it again.

EDIT : JP - great minds think alike?

[jpsmith1cm]

I don't know about "great" here.....

[ryan1088]

One note I'd add here is I had a tooth strip out so it would hang up in the same spot every time. It took me tearing the timer out of the case to see it. This isn't hard to do, just takes a minute to take a peek.

[Dchappa21]

[QUOTE=jpsmith1cm;14249761]Simple test.

BEFORE you touch the timer wheel, take a sharpie and mark the inner wheel of the timer inline with the time arrow.

Wait 5 minutes.

This is the first thing I do now as well.... That 5 minutes feels like 30 waiting to see if it moves.

[jpsmith1cm]

This is the first thing I do now as well.... That 5 minutes feels like 30 waiting to see if it moves.

not if you then take a few minutes, close off the king valve and pump the unit down to start to defrost it....

[Dchappa21]

not if you then take a few minutes, close off the king valve and pump the unit down to start to defrost it....

Lol, I do this too but it still seems like time goes extra slow waiting around for the clock to move or not move...

[W4NMT]

I agree with cj walker....check the defrost initiate/terminate stat..

[W4NMT]

I concur w/cjpwalker. Sounds like a bad defrost ini/ter. control. grabbit an growl!

[W4NMT]

oops, takin this new drug called DAMMITOL!