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Replies:
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| Xenos
Webmaster 
|  "Re(1):Commercialheatpump&CoolingTowerOperatio"
, posted Sun 6 Mar 15:21  
70 is fine, however in the summer during the hot weather 70 will be hard to maintain. Now if your having a heating problem giving the loop a boost may help you out. As far as the heatpumps go they should be operating in both heating and cooling at this temperature. Are these true heatpumps or are they utilizing chilled water/heating coils? I started up 350 heat pumps at Algonquin College last year. They were called heatpumps however the heating was actually a hot water coil and not done by the compressor.
Xenos.
The best way to escape a problem is to solve it.
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| | acadian
| "Re(2):Commercialheatpump&CoolingTowerOperatio" , posted Sun 6 Mar 17:42
Hello and thanks for getting back to me.
These heat pumps are along all perimeters under the windows.
They all have there own compressor, fans, control etc.
When you look at the heat pumps I notice two copper pipe going to pipe chase and I thought that there was condenser fans on the roof but it turn out that only a cooling tower is present. When I look at the main disconnect to the cooling tower and tried to start the fan on manual mode nothing happens and I know that by doing so it should bypass the B.A.S
HeatPump&CoolingTowerOperation
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| | Xenos
Webmaster
| "Re(3):Commercialheatpump&CoolingTowerOperatio" , posted Sun 6 Mar 18:07
I would like to add the operation of the heat pump and cooling tower are completely different issues. A heat pump system designed on a loop is designed this way to allow each heat pump to run in heating or cooling at any time transferring their energy to of from the loop there by saving on energy costs. It’s possible there is a low limit safety on your cooling tower to prevent the fans running too low to prevent freeze up.
Xenos.
The best way to escape a problem is to solve it.
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| | Xenos
Webmaster
| "Re(3):Commercialheatpump&CoolingTowerOperatio" , posted Sun 6 Mar 18:00
Odds are there is a 3 way valve bypassing the cooling tower and the tower it’s self will only fire up the fans when your in full flow mode. This will when the water temperature has risen above the set point on the BAS. I mention this since you stated you were in Canada and I cant imagine the water getting that hot yet. I would lower the BAS set point and see if the system switches over to cooling.
Xenos.
The best way to escape a problem is to solve it.
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| | acadian
| "Re(4):Commercialheatpump&CoolingTowerOperatio" , posted Sun 6 Mar 18:24
Ok those cooper pipes are connected to each other "heat pumps"?
I'm trying to make some sense on how this system work I though that the plumbing would all connected to a main supply line and return and somehow make its way to the cooling tower I’m working with out any as-built.
And about the cooling tower the reason I also look at this part of the mechanical is that I have been on the roof many times and I have yet seen the cooling tower on! The fan blade still has some snow from the last snow fall from about a week ago.
I check the conds pumps and they are running.
HeatPump&CoolingTowerOperation
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| | acadian
| "Re(2):Commercialheatpump&CoolingTowerOperatio" , posted Sun 6 Mar 17:29
HeatPump&CoolingTowerOperation
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| | Freezone12
| "Re(3):Commercialheatpump&CoolingTowerOperatio" , posted Thu 14 Apr 20:15
I had a similar system to the one you are describing, the only difference being the tower water (open loop) went to a heat exchanger where the condenser water from the heat pumps (closed loop) dissipated or picked up heat depending on the season.
This design was nice in that it kept trash that invariably gets into cooling towers from clogging up the condenser coils in the heat pumps.
The system utilized a boiler during the winter months.
The condenser loop supply was maintained at 82'F. (Dallas, TX.)
Undoubtedly your system has a three way valve as previousely mentioned that is controlled thermostatically.
If you are seeing snow on the fan blades of your cooling tower, I wouldn't think you need to be too concerned about your tower water being too warm.
Take some time and study the system. It all goes back to the basics.
_______________________________________
If it don't fit force it.
If it breaks it needed to be replaced anyways.
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