Reply to Thread

I'm new to markets but in my short experience I would have to agree that this case probably needs to stripped down and cleaned, and possibly even tape off some of the lower louvers to forc
e.the air north. It's very rinky.dink.but it works.

Check your superheat too make sure your feeding the evaporator coil properly.

Originally Posted by jpsmith1cm

This is almost NEVER a good idea.

There is a proper position for a fan blade within the plenum, and installing a larger (or smaller) sized motor can and WILL change that postition, altering airflow for the worst!

Replace the motor with the proper sized one.

Yes JP and it would be a very bad idea for me to disagree with another fellow
CM that has all those rounds on his profile page
By all means always take my 45 years of information with a grain of salt as I
don't mean to criticize others and there are how many grains in those rounds?

I am so thankful for this forum as it often shows many of us that some of the
tactics we have used in the past that worked actually turned out to be
incorrect

Always go by mfg specs first then if that doesn't work go right to the source
and ask the mfg application engineer
They will help you as they are proud of their product and their reputation

Originally Posted by jpsmith1cm

This is almost NEVER a good idea.

There is a proper position for a fan blade within the plenum, and installing a larger (or smaller) sized motor can and WILL change that postition, altering airflow for the worst!

Replace the motor with the proper sized one.

X3

Look here page 2 & 3. Pay attention to wattage and motor dimension.

http://www.aosmithmotors.com/uploade...Web.pdf?n=5332

Going higher in wattage will use a thicker motor and place the blade above the plenum. Going lower in wattage will use a thinner motor and place the blade below the plenum.

Originally Posted by crackertech

Really!!! I guess you don't work on a contract Market.

Some of the new Barker cases, I'm doing them all at once.

The whole case has to be pulled, you've got to pull the plenum out just to get at the fans.

Yep, a couple of cheap 9watts make good sense in that case

Originally Posted by jpsmith1cm

This is almost NEVER a good idea.

There is a proper position for a fan blade within the plenum, and installing a larger (or smaller) sized motor can and WILL change that postition, altering airflow for the worst!

Replace the motor with the proper sized one.

X2

Originally Posted by therock

There's not a grocer born that doesn't overload a produce case!!!!
You can't stop them and health (temperature) inspectors know that
They stack it up for impulse buying almost 2 feet out of the air flow
then all the cold air falls on the floor and none makes it to the top shelf
My IR thermo shows 59 to 60 at times on produce
Give them a picture of max load lines and they smile at you and then
as soon as you leave they overload the case so they won't get fired
Some would rather stock a non refrig product on the top shelf so they
can continue overloading the lower shelves and dump horsepower on the
floor but it makes a good cold display for beer on sale on the floor LOL

If one fan motor has failed they all have to be replaced as they have
the same hours history on the bearings and you can't see lowered rpms
and don't allow any bent blades which do cause lower rpms = lower cfms

If you unloaded and power washed all possible air flow restriction areas
replace all fan motors, check for correct blades and balance the blades
If the motors are replaced I increase wattage size to at least 9w if smaller
than (4 or 6watt) that, check superheat and coil temp defrost clock and
mfg settings, check the R-22 compressor for blow by caused by case
overloading for 5 years then remark case load limit lines and call it a day

Really!!! I guess you don't work on a contract Market.

Originally Posted by icemeister

Here's the case specs for the RIN3:

RIN3 Technical Data Sheet

If the case in question is a different model, go to their search page here and enter the case model you have.

The RIN3 calls for a 20ºF evap temp and 27ºF discharge air with 4 defrosts/day, time terminated at 20 minutes.

Verify your store conditions are at or below 75ºFdb/55%RH.

Also, the shelf sizing and load limits are critical on these cases.

THANKS

Originally Posted by therock

If the motors are replaced I increase wattage size to at least 9w if smaller
than (4 or 6watt) that,

This is almost NEVER a good idea.

There is a proper position for a fan blade within the plenum, and installing a larger (or smaller) sized motor can and WILL change that postition, altering airflow for the worst!

Replace the motor with the proper sized one.

Originally Posted by jpsmith1cm

Your case is too friggen warm


Set it down to 32 supply air or so.


While you're at it, make CERTAIN that the product stocked is cold enough (below 35F)

If it isn't you're BOTH wasting your time.

X2 Ive run into this often at same store after health dept visit.

There's not a grocer born that doesn't overload a produce case!!!!
You can't stop them and health (temperature) inspectors know that
They stack it up for impulse buying almost 2 feet out of the air flow
then all the cold air falls on the floor and none makes it to the top shelf
My IR thermo shows 59 to 60 at times on produce
Give them a picture of max load lines and they smile at you and then
as soon as you leave they overload the case so they won't get fired
Some would rather stock a non refrig product on the top shelf so they
can continue overloading the lower shelves and dump horsepower on the
floor but it makes a good cold display for beer on sale on the floor LOL

If one fan motor has failed they all have to be replaced as they have
the same hours history on the bearings and you can't see lowered rpms
and don't allow any bent blades which do cause lower rpms = lower cfms

If you unloaded and power washed all possible air flow restriction areas
replace all fan motors, check for correct blades and balance the blades
If the motors are replaced I increase wattage size to at least 9w if smaller
than (4 or 6watt) that, check superheat and coil temp defrost clock and
mfg settings, check the R-22 compressor for blow by caused by case
overloading for 5 years then remark case load limit lines and call it a day

Originally Posted by thefreezerguy

If you believe this case to be a Hussmann "RI" island case, the supply air spec is 26 - 27. In addition, there are several supply air metering plates inside the case that get plugged solid and need cleaned.
Also, the defrost spec is 6 times (every 4 hours) / day for 20 minutes. I set the duration for 25 minutes given the region I am in. It is not "too much" defrost if the case is set down to the proper supply air temp and it builds the expected frost load on the coils.

x2. These cases plug up with dirt faster than any other case in a supermarket. There is a horizontal baffle mounted in the 'tower' the same height as the pans and I would bet money it's plugged solid. You will need to remove all the bottom product and wash it out with a hose. A velometer is a must-have tool for working on cases.

If you believe this case to be a Hussmann "RI" island case, the supply air spec is 26 - 27. In addition, there are several supply air metering plates inside the case that get plugged solid and need cleaned.
Also, the defrost spec is 6 times (every 4 hours) / day for 20 minutes. I set the duration for 25 minutes given the region I am in. It is not "too much" defrost if the case is set down to the proper supply air temp and it builds the expected frost load on the coils.

We recently removed one of these cases because it would not hold temp on the ends.

I agree with jp. Reduce the defrosts to 4x a day. 30min duration is plenty.

As icemeister indicated, shelf sizing/placement and load limits are very critical in these island cases.

Here's the case specs for the RIN3:

RIN3 Technical Data Sheet

If the case in question is a different model, go to their search page here and enter the case model you have.

The RIN3 calls for a 20ºF evap temp and 27ºF discharge air with 4 defrosts/day, time terminated at 20 minutes.

Verify your store conditions are at or below 75ºFdb/55%RH.

Also, the shelf sizing and load limits are critical on these cases.

Call hussmann and get case specs

Did you check the honeycombs themselves? They can get a nice blanket of crap on top of them that will impede airflow quite a bit. I'd think the week holes in the back of the case may be able to keep the lower shelves at temp? Maybe?

First off, I'm going to say too much defrost.

A case like that will do fine with 4 a day, although you might need to stretch them out to 35 minutes or so.


Those can be a royal pain to get to hold temp.

You MUST cover all of the bases. Get your superheat down, your suction pressure is a bit high for a case like that. I'd like to see an evap down closer to 15-18 rather than 21.

island style with 3 total levels. defrosts 6 times a day for 30 mins. I arrived on site 2 hours after the last defrost. and the clock was set fro the proper time.

defrosts at 4, 8, 12 a/p

the case is a hussman and very closely resembles the RI3N model

I did check the supply temp getting down to 29-30 and middle and low shelf were at 35-36. Product came from the WIC which was also at 35

Originally Posted by mpr73

i have case set down to 28 or so on the stat to hold a mid 30 reading and i re stocked the case with product from the walk in at is at temp

Not trying to be a jerk, but did you VERIFY that?

If not, then it wasn't at temp.