View Full Version : Water source heat pump supply G.P.M.
01-26-2007, 08:44 AM
Have to install 31/2 ton water source heat pump in high rise will be using domestic water for supply to unit . Will be hooking in to 3/4 water line serving 2 restrooms @10.5 GPM need for unit will 3/4 be able to supply enough water.
01-26-2007, 09:04 AM
It depends on the pressure drop of the line and other take offs, system pressure, etc.
01-26-2007, 03:40 PM
tapping into prv 60# water line. Less than 10 ft straight pipe
01-26-2007, 10:05 PM
For standard piping practices I use on condenser water systems, 10' of 3/4" copper pipe should be ok for 10.50gpm, but 20' would be pushing it.
You are not hooking this up to a condenser water system. There are alot of factors here like water temp, velocity of the water, changing pressure as the restrooms are being used, etc.
I would suggest adding a Water Regulating Valve and a Flow Meter. Then verify the flow on startup with all the fixtures in the restroom on.
01-27-2007, 07:56 AM
Just installed a M'cquay 3.5 ton heat pump, Thursday. Actually used the existing piping from the old unit which was a old 1.5 ton unit. Supply was 1/2return was 3/8" copper.The work was done in a high-rise, downtown Chicago. The water temp was 40 degrees. My main concern was the pipe size also. The take off from the building main was less than ten feet. I tied everything in and actually had to throttle back the supply at the riser, too much water. dialed in the reg valve,unit runs just fine.
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