lendee
New Member
Hi all: So I got this used chiller on e-bay and got it hooked up to my res tank . Printed on the chiller is it's water requirements 180 gph to 600 gph so I figured to use a 400 gph pump on it. To test it I used my discharge line on my bloom res & hooked it into the chiller and partially closed the input valve to the grow I use a 1055 gallon per hour res circulation pump and didn't want to exceed the max limits of chiller all went well the res chilled to set temperature and the chiller cycled fine.
I didn't want to guess at the amount of water I was supplying so having a 1 liter measuring cup I converted everything to liters and then to liters per second now I could see how many liters per second was coming from the discharge of the chiller converting low & high requirements gave 11.4 liters per min low to 37.9 liters per min high and then dividing by 60 gave 0.19 liters per second low and 0.6 liters per second high. So I expected to take from about 5 sec to 2 second to fill the 1 liter container. I was shocked when my 1055 gph pump barley obtained the low limits of the chiller I didn't know if my pump was going bad or what was going on. I had a brand new 2700 liter per hr - 712 gph pump so I hooked it up by it's self to the chiller and tested it's output. The new pump, 2700 liters per hour / 60 = 45 liters per minute divide by 60 = 0.75 liters per second, I should get a liter container filled in about 1 second. What I got was almost 5 seconds to fill a 1 liter container. Which equals 0.2 liters per second or my 2700 ltr ph pump is now a 720 ltr ph pump or 180 gph actual pumping capability.
Now I'm totally confused just what are we getting from the pump companies or what the hell am I doing wrong here other than the resistance of the chiller coil the pump has no load & when using my res circulation pump as a second test I got the same results from both pumps the actual output of each pump is about ¼ of it's advertised capability. Can anyone shed some light on this ??
I didn't want to guess at the amount of water I was supplying so having a 1 liter measuring cup I converted everything to liters and then to liters per second now I could see how many liters per second was coming from the discharge of the chiller converting low & high requirements gave 11.4 liters per min low to 37.9 liters per min high and then dividing by 60 gave 0.19 liters per second low and 0.6 liters per second high. So I expected to take from about 5 sec to 2 second to fill the 1 liter container. I was shocked when my 1055 gph pump barley obtained the low limits of the chiller I didn't know if my pump was going bad or what was going on. I had a brand new 2700 liter per hr - 712 gph pump so I hooked it up by it's self to the chiller and tested it's output. The new pump, 2700 liters per hour / 60 = 45 liters per minute divide by 60 = 0.75 liters per second, I should get a liter container filled in about 1 second. What I got was almost 5 seconds to fill a 1 liter container. Which equals 0.2 liters per second or my 2700 ltr ph pump is now a 720 ltr ph pump or 180 gph actual pumping capability.
Now I'm totally confused just what are we getting from the pump companies or what the hell am I doing wrong here other than the resistance of the chiller coil the pump has no load & when using my res circulation pump as a second test I got the same results from both pumps the actual output of each pump is about ¼ of it's advertised capability. Can anyone shed some light on this ??