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Old 10-26-2011, 01:49 PM   #1
Join Date: Sep 2011
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hvac logic

I've got a logic question here and don't really know how to approach this.

Got three water source heat pumps. Need to only allow two to operate at one time. To complicate things a bit more, I need the do a few odd things with valves to run a 2nd booster pump when unit 3 is operating with other units.

Got a water cut off valve for each heat pump. Call em (HP)1,2,and 3 with valves V1,V2 and V3.

Possible states of units and valve positions look like this:

Units on: Valve1 V2 V3 pump#2
1 on on off off

2 on on off off

3 off off on off

1+2 on on off off

1+3 on off on on

2+3 off on on on

The oddity here is that I need valves 1+2 open all the time unless unit 5 is on.

Were do I find a way to setup logic for this? Can you point me to a device that can be programmed to do logic like this?



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