cannot maint. room temp. & chiller tripped - http://www.hvacmechanic.com/ Forums

Original message

chriswong

219.93.152.130

"cannot maint. room temp. & chiller tripped" , posted Fri 10 Oct 10:49

I need help on the following problems for our chiller system
1. there are 3 rooms, 1 big room cannot maint required temp
2. when all 3 rooms on for a while, the chiller sometime trip and hot air will come in then we have to reset the chiller
3. Carrier tech guy has advise us to do a loop system because our chiller capacity output is too big and the return pipe distance is too short. Is this the right explaination?
4. Now we are trying(suggested by carrier tech)when 2 rooms on condition then use 1 bigger compressor and if 3 rooms on then use 2 compressor

I am taking the operation log for the chiller for the next few days to monitor the changes.

Thank you

Replies:

harpo

98.113.183.49

"Re(1):cannot maint. room temp. & chiller trip" , posted Wed 15 Oct 19:45

the chiller should have a chilled water setting on the controller for itself...4F-45F is typical for the chiller loop dependinng on the style of chiller control you might have a setting to match the lenght of the loop.the setting is considered a reaction to what is coming back to it on the return and how the chiller reacts with cyclying off compressors or keeping them on.model number if possible.then the settings on a 3 air handlers if the rooms have their own dedicated stat and chiller control......and the biggest design factor is it a 3-way valve on the air handler(s) the chiller has to see constant flow as if it was just a straight run with no air handlers.if you have in-line control valves,and the spaces satisfy and the water shuts off to the zone. how does the water get back to the chiller,and the flow switch might be shutting you down.

It ain't going to get any lighter looking at it!

Jojo98

68.60.207.210

"Re(1):cannot maint. room temp. & chiller trip" , posted Fri 10 Oct 23:43

First, Your terminology is difficult to understand.
Second, If you could provide: Unit M/N and S/N, Alarm codes, and chiller pressures and temperatures, that would help significantly.
If the chiller is oversized, and it is locking out on low cooler temp. Then I agree.
Also, If you are working with a Carrier representitive, then the only equipment they go to school for and work on is Carrier equipment. I would heed their advice, especially if they have phyically seen the chiller package.