Hope someone can help me, Have a customer in which they have about 15 water source heat pumps on a water loop with no boiler to heat the water. Water is fed and cooled from a tower and holding pond and also serves to cool many other water cooled machinery. Now the return water tempature from the entire loop varies depending on the # of differant equipment it is currently serving and outside air temp. Supply Water temp is recorded sometimes as low as 39 dg. during shutdowns.
So obviously I am having problems with freeze protection lockouts (carrier RHR060 units) when the water gets cold and units running in heat. Any suggetions ?(besides adding a boiler)
Also,water has no additives for freeze protection.