hobart reach-in

[spst460v]

i have a hobart (df2) freezer, two door reach-in. the unit was cooling and then it quit. i noticed it was freezing uo at the evaporator where the cap tube enters, with the rest of the evap. warm, i am getting 220-5 after replacing the drier. with a 92 deg. outdoor ambient, and a 86deg inside freezer temp. i did all the repairs by the book and charged by weight. my headpressure seems awfully high for such a low suction. also i noticed at the time of start-up after repairs the compressor stays in the start mode for about 20-30 seconds then goes into run mode. it will hit 33.6 lra's then to about 6.3 rla. is the start winding going out? thanks.

[clavej2]

more inf, (S.P) (D.P)THE YOU CHANGE THE COMP,THE YOU BRAZE ON CAP TUBE (AMP)

[freezone]

Your cap tubes are resricted.

[Dad]

Have this problem many times with the stand up QF1 and QF2 Hobarts. Replace your cap tubes. Call Traulsen with model and serial, don't forget the refrigerant type to order new caps. Use a Sporlan 032-capt drier and ream the cap tube ends.

Factory will tell you to increase the charge up to 3.0 oz using the above drier. Set charge with subcooling and you be golden!

[airworx]

captubes. i would replace captubes with txv.

[Dad]

Would have to replace the condenser or at the very least install a receiver and sight glass. $$$$$$$ On these Hobart boxes that is not the way to go. $10.00 for a cap tube and lesss time.

[spst460v]

i agree with freezone. thank you lusker for the input on this, that was the most helpful yet, as for the remark on adding a txv sounds good but the way to much work and the system was not originally set up for txv, doing something like that would be a whole new can o worms. thanks everyone.

[spst460v]

ok allthat is great but i am most worried about the extended start time. any thoughts?

[Dad]

Your start problems may be due to starting with a restriction and will correct itself with a new cap tube. If you have 220 head over 5 suction this may well be the problem. Other issues are as follows.

1. How old is the compressor?

If the compressor is old you may have start component or internal problems as I am sure you know. This is doubtful if the unit is fairly new. Check your caps with a tester and make sure you have a replacement relay handy just incase. We have used the s/s all-in-one start system with success if and only if needed.

2. Does it have the aluminum cond. coil?

The nice Hobart aluminum coils are not only hard to keep clean (head pressure problem again) but will stress leak with age and the use of the wrong type of coil cleaner. A steel coil replacement kit can be purchased from Traulsen for $$$$ if the box is in good shape and you need to replace it.

3. Does it have a good cond. fan shroud? (Unrelated)

Hobart units will maintain high head pressures even with a clean coil and no restriction if the fan shroud is missing. Even you have to make your own, I would highly recommend it and make sure the fan blade is clean. (This will not cause low suction)

My head pressure point is... keep the head pressure under control or you will be replacing the cap tube again if it is POE oil.

I hope this brief helps. Again, your starting problems may go away when you replace your cap tube.



P.S. When installing a cap tube drier, the exit end of the drier must be pointed down to keep a liquid seal. Never install a drier with the cap tube pointing up or level, ever!

[Edited by lusker on 06-22-2004 at 07:35 PM]

[codgy]

Compressor start-up problems are likely caused by compressor overloading at initail pulldown, captube units should have a crankcase pressure regulator to control suction pressure at compressor. Check this controls setting, I bet if its been serviced in the past its not set right.

[spst460v]

codgy, thank you for the input but this unit is as plain jane as it could come for the exception of the 404a and the poe which i am learning and leaves something to be desired. at this time i would like to thank everyone who had any input into this you have been a great help. it works now. how long i wonder? i wish this was an r12 system. thank you.