It always seemed that our forced air heat was slow to respond and the coil fan ran a lot whether on gas or wood. I thought I would measure all the pipe in the pre-existing system and assign equivalent lengths to the fittings and accessories to give me a total head.
When I went to apply an equivalent length to the Erie zone valve to the coil I notice that the 1†pipe was necked down to ½†and then up to a ¾†NPT Erie zone valve with a 3.5 Cv rating. Head is 9’ at 7.5gpm. My overall head calculated to 18.85’ @ 7.5gpm. This being the case the installed Taco 007 is highly inadequate and incapable of delivering adequate flow to efficiently satisfy the coil.
If my assumption is correct I should replace the current configuration at the 1†pipes and replace with a 1†NPT Erie valve which if I understand the information correctly would allow 8gpm @ 2.31’ head. This would lower my system head to about 12’ head at 8gpm which could be handled by a Grundfos 15-58 rather than going to a more expensive and expensive to operate pump. (I’m gambling this because my existing 007 system is incapable of delivering 8gpm but is still able to heat my house so with the new pump I should increase flow about 60%).
Is my thinking and troubleshooting correct? I guess if this does not help I always have a spare 15-58 when I need one.
When I went to apply an equivalent length to the Erie zone valve to the coil I notice that the 1†pipe was necked down to ½†and then up to a ¾†NPT Erie zone valve with a 3.5 Cv rating. Head is 9’ at 7.5gpm. My overall head calculated to 18.85’ @ 7.5gpm. This being the case the installed Taco 007 is highly inadequate and incapable of delivering adequate flow to efficiently satisfy the coil.
If my assumption is correct I should replace the current configuration at the 1†pipes and replace with a 1†NPT Erie valve which if I understand the information correctly would allow 8gpm @ 2.31’ head. This would lower my system head to about 12’ head at 8gpm which could be handled by a Grundfos 15-58 rather than going to a more expensive and expensive to operate pump. (I’m gambling this because my existing 007 system is incapable of delivering 8gpm but is still able to heat my house so with the new pump I should increase flow about 60%).
Is my thinking and troubleshooting correct? I guess if this does not help I always have a spare 15-58 when I need one.