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Thread: Motor protector module
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24-04-2008, 10:02 PM #1
Motor protector module
I was working on a Climate packaged chilled water unit today with 4 circuits that each had faults on them.
On one of the circuits i traced the fault to the compressor motor protector module.
I linked out the module whilst checking the pressures and the temp of the compressor and monitoring the amps.
The compressor ran fine and the circuit seemed to be running ok.
My first question is, can just the motor protection module be replaced? See the pic below ( the picture isnt great sorry)
My next question is, on the wiring diagram that i was following i found each circuit had aTEV bypass solonoid valve, but what is the purpose of this TEV bypass?
The difference between genius and stupidity is that genius has its limits.
Marc
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24-04-2008, 10:40 PM #2
Re: Motor protector module
Hi Marc,
That looks like a copeland scroll lecky box. Yes you can replace just the module (int69 scy?) There are different models though, one just measure the thermistors and the other also monitors the phases for reverse rotation protection.
Don't know about the solenoid though
Cheers Jon
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24-04-2008, 10:41 PM #3
Re: Motor protector module
The answer is yes for the first question. That's a INT69SC from Kriwan. Website http://www.kriwan.de or .at
I guess that the bypass for a TEV may be useful for vacuuming the circuit on suction side.
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24-04-2008, 11:02 PM #4
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24-04-2008, 11:04 PM #5
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25-04-2008, 08:15 AM #6
Re: Motor protector module
Anybody
The difference between genius and stupidity is that genius has its limits.
Marc
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25-04-2008, 11:39 AM #7
Re: Motor protector module
I meant to vacuum the whole circuit with just one pipe on the suction side.
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25-04-2008, 02:03 PM #8
Re: Motor protector module
Hi Marc.
Just a little further info on the INT69 Series controllers. Most of which you probaly know - but someone may benifit!
As Monkey Spanners already points out there as a large range of these controllers available.
(See link below).
A quick reset facility is available by interupting the mains supply for 5 mins.
This overides the lock out and inbuilt time delays.
For further info refer to the data sheet provided.
http://www.kriwan.com/en/Protection_...ilyID__127.htm
This second data sheet refers to the 15 differant ptc probe temperature responce options available. (60c to 180c )
As to the TRV bypass solenoid definatly strange!!!
I have seen something similar to do with liquid injection / Oil cooling.
As you say hopfully someone can shed some light on what it is for.
Cheers Grizzly.Last edited by Grizzly; 29-04-2008 at 05:24 PM.
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25-04-2008, 02:49 PM #9
Re: Motor protector module
My next question is, on the wiring diagram that i was following i found each circuit had aTEV bypass solonoid valve, but what is the purpose of this TEV bypass?
Would be interesting to see a picture of this and any other valve arrangements on this system.
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25-04-2008, 02:52 PM #10
Re: Motor protector module
Just another thought, is it a heat pump?
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25-04-2008, 06:19 PM #11
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25-04-2008, 06:24 PM #12
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25-04-2008, 06:35 PM #13
Re: Motor protector module
The difference between genius and stupidity is that genius has its limits.
Marc
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25-04-2008, 06:57 PM #14
Re: Motor protector module
Hot-gass bypass is often used for multiple evaporators, or... whenever a very precise temperature is required. (+/- 0,2°C) The liquid solenoid is switched by a PID regulator, but whenever temperature reaches setpoint, the compressor would slowly reach vacuum. To avoid this, the suction pressure is kept at a certain higher point through the hotgass bypass.
What kind of cabinet is this?
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25-04-2008, 07:07 PM #15
Re: Motor protector module
Does the bypass line go into a filter drier and then into 3 way solenoid valve arrangement? allowing pump down to occur keeping any refrigerant before the solenoid on the tev side to be held for the circuit when the Lp cuts back in, this stops the compressor from having a large short cycling time.
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25-04-2008, 07:59 PM #16
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25-04-2008, 09:53 PM #17
Re: Motor protector module
Hi Marc
The bypass solenoid valve pipe, does it run to another TEV onto the evaporator ?
To cover for the full duty for the compressor they may have to stage the operation of the TEVs
At full load both TEVs in operation at below 50% TEV with soleniod shuts off
regards Bobjob
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25-04-2008, 10:26 PM #18
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26-04-2008, 05:17 PM #19
Re: Motor protector module
and why would the pressure switch be set at 3 bar? the same as the Lp switch?
The difference between genius and stupidity is that genius has its limits.
Marc
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27-04-2008, 04:01 PM #20
Re: Motor protector module
Also if it was as you say then why would the solonoid be called TEV bypass solonoid becase it isn't bypassing it?
The difference between genius and stupidity is that genius has its limits.
Marc
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27-04-2008, 10:13 PM #21
Re: Motor protector module
Hi Marc
Many of those Climate chillers were built in the factory to a clients spec.
They would normally use there Hitachi chillers for standard work but if the customer required such things as low noise operation or low water flows,low temperature operation they would modify a Hitachi chiller or build something from scratch.
The 2 TEVs may by used with the unloading
The setting of the pressure switch should be above the LP cut out to unload the cylinders and close off the refrigerant going to the one TEV
from your information do you have 4 circuits or do you have 4 compressors ?
If its 4 compressors with only 2 refrigerant circuits, this would be a standard Climate chiller the pressure switch would probably switch off the one TEV and one of the compressors.
regards Bob
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29-04-2008, 07:11 PM #22
Re: Motor protector module
My dad used to work for Climate and I asked him about this. He gave the exact same answer as Bob. So, I would go with what Bob said.
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08-05-2008, 11:24 PM #23
Re: Motor protector module
Marc,
the TEV bypass is for low ambient conditions. It is energized for the 1st 30 secs after compressor start up to prevent the suction pressure dropping too low to cut out on LP and preventing the evaporator temp from dropping too low, thus giving the head pressure time to rise to a satisfactorily suitable level and hence raise the suction pressure.
Hope this helps.