can anyone explain the chart located in the manual.
looking at COP numbers for flow

can you post the chart?

http://www.climatemaster.com/downloads/RP812(3).pdf (page 7 036 heating)

sorry but i have not been suscsessful pasting the page.

i am curious as with a lake loop my water is 4 degrees C at bottom with ice on lake. that is close to 40 F.
how can i measure my source flow? i have 5 300 foot 3/4 poly loops fed from a 1 1/4 pipe 100 feet one way and ten feet from lake level to pump altatude. it is a grundfos 220 pump with a variable prop
positioning selector. you would think maximize this flow?


from this chart ewt = 40, ewt = 100, lwt=111.7, does this mean if i have 120 gallons that it would go from 100 to 111 in 120/5 25 minutes???

what is the 5 that you are dividing the 120 by?

the correct way to look at this is:

If you have 120 gallons that you want to raise 11° this will require 10,560 btu's ( 120*8*11)

The heat capacity of of your heat pump is at the conditions you state is 29,2000 btuh.

so if you do 10,560 / 29,200 = .36 hours = 22 min.

This is based on a flow of 9 gpm on both the source and load side. If you have P/T ports on your system, you can determine flow via the delta P across the heat pump. If you don't have P/T ports....shame on you.

the 5 was based on a flow of 5 gpm. i was just speaking with the rep. he was showing me as per the charts that i can determine the flow from the p/t ports. they only put them on the lake loop. i had asked for actual pressure guages when they were installing but......o well....
i hope they will give me two more p/t ports then i can figure this out. the source loop has nothing on it.

in your math 120 gallons 11 degrees, where did the 8 come from?
thanks eh! ;)

8 is how many pounds one gallon of water weighs. good luck

thanks
i mean the load side has no ports. but, looking at the curves is the presure drop across the unit like the lake loop/ the lake loop p/t ports are imediately outside the unit. to install the p/t's on the load side i would imagione the same?
will these pt ports measure such small psi?

yes  ...the P/T ports  go just out side of the unit.   You need a pressure gauge to measure the psi

See attached

my supplyer is geting me two more p/t ports to install on the load side.

he has a "kit" he said i can use to do my measuring. my concern is that looking at the charts the load side presures are quite small.....meaning accuracy?

i would guess then that the temperature is also very critical. i think or hope his kit would provide both as it is a p/t port or do i need to plug two things in. guess i need to see the kit

fun...this is....

the numbers on the chart are the pressure drop across the coil, not the actual pressure you will be reading.  So you are looking for a difference in pressure of 1.1 pounds from In and Out.

Maybe you understand this,  yes you will need an accurate gauge to show a 1.1 psi delta.