Intellipak

[rudy65]

What up homies? Can anyone help with A TRANE 20ton chiller equiped with an Intellipak? The problem im having is when the unit satisfies it doesnt go through the pumpdown cycle, It just stops. But this only happens when compressor 2 is the lead. If the unit leads with 1 the unit pumps down and terminates on low low pressure?

[bku46]

What is the model number?

[rudy65]

Will have to get back to You on that.

[Edited by rudy65 on 05-14-2005 at 06:15 PM]

[acjourneyman]

Just disable it and problem solved!

[wasp]

Both circuits shut off at the same time or does the #1 compressor pump down like normal and the #2 just shut off? When it shuts off, are the liquid line solenoids still energized? If they are, then something in the control circuit may be screwy or screwed with.

[rudy65]

This is A single circuit. With 2 compressors and when it satisfies there is only 1 running. As far as the LL valve, It stays energized whenever comp 2 is stage one and the unit satisfies

[wasp]

Obviously these are tandem compressors, do they both run at the same time all the time or do they stage up and down? If there is a selector switch to run either compressor as lead and the other as lag, the sequence of operation should be the same, evidently there are issues with the control circuit pertaining to circuit #2 that need to be investigated. It has been about two years since I have worked on one.

[bku46]

What you have is a one circut 2 compressors in tandum A and B You have one liq sel. valve per circut. When cooling is required Comp A starts or B if lead lag enabled. Liq sel is energized, if load is high, secong comp will start. Only when load is satified and there is no cool demand, comp. will stage off, selinod will de-energize and system will pump down. The last comp. running will do the pump down. Thats how it should work,. You only have one refrig circut with two comp. We tandum the compressors for efficency and capacity control.

[rudy65]

Thanks bku46, That is exactly what I have, and the lead/lag is enabled. The problem always and only happens when compressor 2 leads, or every other shut down.

[gsc106]

we have a problem here, correct me if i'm wrong, but, you can't lead lag trane compressors in tandem. they are set up to stage right to left or shortest suction line first ,this is the only way you can run them due to oil flow return and oil sharing of compressors. good luck

[powerhead]

The larger chillers (usually over 25 ton) are 2 circuit chillers with 2 sets of compressors in tandem. If you enable the hot gas option then you cannot set up lead/lag. This is because there is only one hot gas solenoid and it is located on cicuit # 1. If you want to lead/lag circuit 1&2 then you must disable the hot gas option.

[rob10]

Originally posted by gsc106
we have a problem here, correct me if i'm wrong, but, you can't lead lag trane compressors in tandem. they are set up to stage right to left or shortest suction line first ,this is the only way you can run them due to oil flow return and oil sharing of compressors. good luck A compressor is always the lead.