Original message
| Circuit
 |  "American Standard RTU doesn't restart"
, posted Thu 19 Apr 14:52:  
My American Standard RTU, after a cold start, will run just fine. After it cycles off, it will not restart on its own. I have replaced the compressor (2yrs ago), this year the mainboard, t-stat, and high limit switch.
Anyone have any ideas what causes it not to restart?
Thanks!
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If you let the smoke out it doesn't work anymore.
[this message was edited by Circuit on Thu 19 Apr 15:51] |
| Replies:
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| so_cal_tech
| "Re(1):American Standard RTU doesn't restart" , posted Thu 10 May 19:23
It could be tripped on a low pressure cut off switch.Take some gauges and check your pressures.
Your emergency is not my emergency due to your bad planning.
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| chiller guy
| "Re(1):American Standard RTU doesn't restart" , posted Tue 24 Apr 06:24
You say that it will not restart on it's own after running awhile. What do you have to do to get it started?
All refrigerants are safe - All refrigerant are dangerous. The difference is YOU !!!
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| | Circuit
| "Re(2):American Standard RTU doesn't restart" , posted Wed 25 Apr 14:06
I de- and re-energize the unit. The other morning it ran for about three minutes and locked out, and I powered off/on again, and it ran for two days without fail, then today I had to cycle it off/on again.
If you let the smoke out it doesn't work anymore.
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| | Chiller guy
| "Re(3):American Standard RTU doesn't restart" , posted Wed 25 Apr 16:38
Your unit is going into a 'lockout" condition.
When you power off the unit you are resetting the unit safeties. Was the unit in the cooling mode when it failed? The three minuets run time is about right for the minimum run time on this unit. It sounds like you did not develope enough head pressure to keep the back pressure up before going off on low pressure.
Have you ever checked the refrigerant charge on this unit? Is it a low ambient unit (model # will tell you). Was it cool outside when it failed? What does the unit serve (office, production facility, etc)?
All refrigerants are safe - All refrigerant are dangerous. The difference is YOU !!!
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| chiller guy
| "Re(1):American Standard RTU doesn't restart" , posted Fri 20 Apr 17:30
It appears you have a 7.5 ton Trane Voyager RTU with gas heat. Correct? If this is the case run the unit through its self test. If you don't know how let me know. If everything operates in self test the problem is outside the unit. If it dosen't pass the test you go the the area where it failed to look for the problem. The controls are Trane electroinc's unless you are using a conventional t-stat in which case you need a converter board. It sounds like you are getting a lockout periodically that needs to be chased down.
All refrigerants are safe - All refrigerant are dangerous. The difference is YOU !!!
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| | Tech-New
| "Re(2):American Standard RTU doesn't restart" , posted Mon 30 Jul 10:02
Hi! Ihave the same problem whit a (YCD090C3HOBE)7.5 ton Trane Voyager RTU with gas heat. Could you say me How can I run the unit through its self test? or Where can I get (on line) the trouble shooting guide?
Thanks
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| | Circuit
| "Re(2):American Standard RTU doesn't restart" , posted Mon 23 Apr 13:04
I had my serviceman run the self-tests and he claims that all is well. HVAC is not my field, but I am learning. Unfortunately, that is costing me $. I have checked the voltages when energized and they all are as should be. The old maint. dir. claims the unit has been a problem for years...
If you let the smoke out it doesn't work anymore.
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| ACTECH4U
| "Re(1):American Standard RTU doesn't restart" , posted Thu 19 Apr 20:47
What is the model # ?
The parts mentioned that were changed this year was that done by you or a company?
Is the supply & return ducting the correct size?
Filters and belts o.k.?
Do you have a programable t-stat or merc. bulb yo-yo ?
ACTECH4U
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| | circuit
| "Re(2):American Standard RTU doesn't restart" , posted Fri 20 Apr 09:02:
Model # YCD090C3HOBE manufactured 8/96. Parts were replaced by Anchor-Robinson/Aire-Serv. Ducting has been said to be correct for the unit, belts are fine, filters changed monthly, coils cleaned very well. Trane T-stat was replaced as well.
If you let the smoke out it doesn't work anymore.
[this message was edited by circuit on Fri 20 Apr 11:00] |
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