Charging r404a help

[jpsmith1cm]

Actually, life has been getting better for me, even though I pretend to be a refer tech by day and pontificate on here by night....

I cannot disagree that this site has improved my skills and broadened my knowledge base. It has changed the way I think about systems and my approach to troubleshooting.

[ECtofix]

I'm not strictly refrigeration. I entered a field in restaurant equipment repair 12 years ago after 20 years military. Currently, in the course of a month I might get half a dozen refrigeration calls.

Going from 25 ton capacity mobile A/Cs (for ground aircraft maintenance use) to refrigeration was a huge leap. Practices there were on a grander scale but lacking the broad-based knowledge and experiences you guys learned and practice. THERE - only a few types of equipment to know and repair with any practices OUTSIDE the base's front gate mainly crossing over to automotive A/C. I was even an instructor in their electrical and A/C tech schools for a few years.

But, I was mainly a tweak in the field, working on electric power units - so didn't even REALLY practice my knowledge in refrigeration theory until I started THIS job. Well schooled and studied for military purposes, but not much practice. Add (or subtract) to that, many things forgotten from years past.

Nevertheless, here I am.

I'd love to go through a modern trade school for reinforcement and to ramp up on newer technology and tools. But at 50 - I don't know.

In the mean time, I'm fascinated with the level of knowledge on this forum. Not just books or a class or alone at a job "scratching my noggin because I never seen this happen before so who do I call" sort of stuff. I can get on here and pick other's brains with questions that haunt me...or others...and load up with know-how from other's experiences.

A knowledge-base such as this forum is invaluable. Such a resource didn't exist ten years ago.

Appreciate ya'll...for your dedication, professionalism and willingness to help out each other (and me) even when you're not on the clock.

[VTP99]

I'm not strictly refrigeration. I entered a field in restaurant equipment repair 12 years ago after 20 years military. Currently, in the course of a month I might get half a dozen refrigeration calls.

Going from 25 ton capacity mobile A/Cs (for ground aircraft maintenance use) to refrigeration was a huge leap. Practices there were on a grander scale but lacking the broad-based knowledge and experiences you guys learned and practice. THERE - only a few types of equipment to know and repair with any practices OUTSIDE the base's front gate mainly crossing over to automotive A/C. I was even an instructor in their electrical and A/C tech schools for a few years.

But, I was mainly a tweak in the field, working on electric power units - so didn't even REALLY practice my knowledge in refrigeration theory until I started THIS job. Well schooled and studied for military purposes, but not much practice. Add (or subtract) to that, many things forgotten from years past.

Nevertheless, here I am.

I'd love to go through a modern trade school for reinforcement and to ramp up on newer technology and tools. But at 50 - I don't know.

In the mean time, I'm fascinated with the level of knowledge on this forum. Not just books or a class or alone at a job "scratching my noggin because I never seen this happen before so who do I call" sort of stuff. I can get on here and pick other's brains with questions that haunt me...or others...and load up with know-how from other's experiences.

A knowledge-base such as this forum is invaluable. Such a resource didn't exist ten years ago.

Appreciate ya'll...for your dedication, professionalism and willingness to help out each other (and me) even when you're not on the clock.

EC By some small chance you wouldn't happen to have a wiring diagram for a Hobart M# DN97 convection oven ?

[ECtofix]

EC By some small chance you wouldn't happen to have a wiring diagram for a Hobart M# DN97 convection oven ?

Not with me but will try to get by the shop tomorrow and look. However, most of what we have is mainly parts ID info and lacking tech literature. Will see.

[Joe Harper]

Unless the diagram is on the machine, your going to have to call hobart and beg them to email it to you..

[ECtofix]

Unless the diagram is on the machine, your going to have to call hobart and beg them to email it to you..

Yup. They're well trained at not sharing. I think the most they'll do is give out part numbers to non-Hobartians.

Hey VTP,
Had an insane day so nothing yet.
Next week. >>>>> I won't forget.

Chances are that our manuals are mainly parts breakdowns but lucked out on a few of them through the years with some service info.

[VTP99]

Yup. They're well trained at not sharing. I think the most they'll do is give out part numbers to non-Hobartians.

Hey VTP,
Had an insane day so nothing yet.
Next week. >>>>> I won't forget.

Chances are that our manuals are mainly parts breakdowns but lucked out on a few of them through the years with some service info.

Thanks EC
Just wanted a wiring diagram for the next time i service this oven. One of the contactor poles was bad. The oven has two 3 phase contactors wired in parallel. The six load wires go to six heater terminals. I can not see the elements so i don't know how they are configured. I would think it's quite simple looking at a diagram. With the one bad pole i had no heat but when i jumped out the bad pole all the heaters work. I'm going to replace with a generic contractor because the fancy Hobart one looks really expensive.This oven is 20 plus years old. That 3 phase heater setup can be a little tricky sometimes.
Thanks again.

[Joe Harper]

The three phase heater is easy. Just like on a pkg unit..

[VTP99]

Unless the diagram is on the machine, your going to have to call hobart and beg them to email it to you..

Joe,
I had contacted Hobart hoping for the best. They pretty much laughed and proceeded to tell me i was working on a dinosaur and nothing was to be had accept some parts. Also said this oven was one of G.E.s prior to Hobart buying.
High end equipment with high price parts and no discounts.

[ECtofix]

Joe,
I had contacted Hobart hoping for the best. They pretty much laughed and proceeded to tell me i was working on a dinosaur and nothing was to be had accept some parts. Also said this oven was one of G.E.s prior to Hobart buying.
High end equipment with high price parts and no discounts.

I've got a pet GE stove at a local daycare that sounds simular. That old fiber wrapped, high temp SOLID conductor wiring. Three phase. They won't get rid of it because it was purchased for them by Elvis Presley, which they remind me of everytime I come to work on it.

Quite a token piece of furniture.

How'd this thread deviate from Charging r404a help ? Did I do that?

And besides...it's Friday night and I should be out singing karaoke. Mbut I'm mon call...

[VTP99]

I've got a pet GE stove at a local daycare that sounds simular. That old fiber wrapped, high temp SOLID conductor wiring. Three phase. They won't get rid of it because it was purchased for them by Elvis Presley, which they remind me of everytime I come to work on it.

Quite a token piece of furniture.

How'd this thread deviate from Charging r404a help ? Did I do that?

And besides...it's Friday night and I should be out singing karaoke. Mbut I'm mon call...

No i on post #63 sorry Woff

[ECtofix]

Well VTP, my email is in my profile so send me yours since I don't see one in your profile. Is that how it works here? Don't know how else to get back to you...

[VTP99]

Well VTP, my email is in my profile so send me yours since I don't see one in your profile. Is that how it works here? Don't know how else to get back to you...

EC,

Sent you a email last night.

[DDDpope]

What he said

Thanx for the descriptive reply. I charged today high side by weight with the system off. Let settle, then turn on machine, frost up to comp and comp is cold in and in a few minutes comp shuts off.
My first question is is the overload inside the 3 n1 is rated at? Then I'm wondering is the comp shutting off because it's too cold?

So I recover out some charge and suction line is no longer frosty and begin too make ice in bottom of evap maybe whole evap couldnt check due to time.

After I get the temp right, I need to install a defrost timer with multiple setings To open and close the hot gas solenoid, water inlet solinoid, water dump solenoid, this is because the control board wasn't working , I was only getting 4 v at the contactor which is rated120 v . Fan, comp, pump all run straight 120 and neautral

What I say

OH NO......Please don,t cobble the machine. Fix it right. If it is not worth fixing, then condemn it. Don't start out your career doing work like that. You will not last long and will be very unhappy. Never try to do your customer a favor by cobbling or taking short cuts. It will come back to bit you. Just ask any seasoned tec, he will tell you a story. Be professional, have a high standard, and be conscientious.

Anyone have a story about trying to do a customer a favor??

[DDDpope]

The contactors for those ovens are usually (mercy contactors) and are expensive. Might try 'General Parts' for a diagram, they have a lot better luck getting service material from Hobart.

[NANOTECH]

Wouldn't have to pay that labor bill HEHE!!

[Joe Harper]

No good deed goes unpunished.