johnw
Member
Hi
I finally bit the bullet and replumbed my 2 fresh water pumps - a 230V Headhunter Mach 5 pump and a 12V Shurflo pump. Attached are photos of the setup.
Setup requirements were:
both pumps to be in parallel (Mach 5 when using shore power or genset & Shurflo when not using shore power or genset)
PRV (Pressure Reduction Valve) to reduce output pressure of Mach 5 (factory set to 66psi) to no more than 50psi
input: must have isolation valve, check valve, filter, use PVC pipe
output: must have accumulator tank, PRV, pressure gauge, bleed/dump valve (used when initially pressurising the Mach 5), separate isolation valves leading to hot and cold water lines
After speaking to Headhunter tech support (thank you Wilson!) I decided to put my only accumulator tank between the Mach 5 and the PRV, effectively isolating it from the FW system (specifically the Shurflo and the 30 gallon hot water tank). A future improvement will be to put a small expansion tank on the output side of the hot water tank to smooth out the Shurflo and allow for hot water expansion.
photo#1: the overall setup
photo#2: closeup of the parallel plumbing setup
photo#3: the bleed/dump valve and another angle of the parallel plumbing
I have the system set for about 38psi when the shower is running (using the Mach 5) and the psi jump to about 48psi for the last 15 seconds that the Mach 5 runs for after the last tap is turned off.
I have the PRV set for 48psi when the Mach 5 is running for its 15 seconds after the last tap is turned off and this gives about 38psi when the shower is running. When a second shower is on at the same time the pressure hardly drops at all - I love my Mach 5
The Shurflo switches on at 25psi and off at 45psi and stays at about 35psi when one shower is on.
It took 3 phone calls to Headhunter, 5 trips to the plumbing shop, a similar number of plumbing reconfigurations and several rolls of teflon tape to get everything finished. It might not be the prettiest thing in the world due to the pink tape, pink PVC primer and green PVC glue, but what the heck, it's in the ER and, so far, works like a dream!
Cheers
John
I finally bit the bullet and replumbed my 2 fresh water pumps - a 230V Headhunter Mach 5 pump and a 12V Shurflo pump. Attached are photos of the setup.
Setup requirements were:
both pumps to be in parallel (Mach 5 when using shore power or genset & Shurflo when not using shore power or genset)
PRV (Pressure Reduction Valve) to reduce output pressure of Mach 5 (factory set to 66psi) to no more than 50psi
input: must have isolation valve, check valve, filter, use PVC pipe
output: must have accumulator tank, PRV, pressure gauge, bleed/dump valve (used when initially pressurising the Mach 5), separate isolation valves leading to hot and cold water lines
After speaking to Headhunter tech support (thank you Wilson!) I decided to put my only accumulator tank between the Mach 5 and the PRV, effectively isolating it from the FW system (specifically the Shurflo and the 30 gallon hot water tank). A future improvement will be to put a small expansion tank on the output side of the hot water tank to smooth out the Shurflo and allow for hot water expansion.
photo#1: the overall setup
photo#2: closeup of the parallel plumbing setup
photo#3: the bleed/dump valve and another angle of the parallel plumbing
I have the system set for about 38psi when the shower is running (using the Mach 5) and the psi jump to about 48psi for the last 15 seconds that the Mach 5 runs for after the last tap is turned off.
I have the PRV set for 48psi when the Mach 5 is running for its 15 seconds after the last tap is turned off and this gives about 38psi when the shower is running. When a second shower is on at the same time the pressure hardly drops at all - I love my Mach 5
The Shurflo switches on at 25psi and off at 45psi and stays at about 35psi when one shower is on.
It took 3 phone calls to Headhunter, 5 trips to the plumbing shop, a similar number of plumbing reconfigurations and several rolls of teflon tape to get everything finished. It might not be the prettiest thing in the world due to the pink tape, pink PVC primer and green PVC glue, but what the heck, it's in the ER and, so far, works like a dream!
Cheers
John