Pomona, CA Clemmons, NC Nashville, TN
Tel: 908-351-5400 www.haywardpool.com
USE ONLY HAYWARD GENUINE REPLACEMENT PARTS
18
DISTANCE FROM OUTLET OF 1st STAGE
REGULATOR TO INLET OF 2nd STAGE REGULATOR
MODEL
H250FDP
H350FDP
H400FDP
BTU
250,000
350,000
400,000
LINE MATERIAL
IRON
PIPE
TUBING
IRON
PIPE
TUBING
IRON PIPE
TUBING
0 to 50 feet
1/2"
1/2"
1/2"
1/2"
1/2"
1/2"
50 to 100 feet
1/2"
1/2"
1/2"
5/8"
1/2"
5/8"
100 to 150 feet
1/2"
1/2"
1/2"
5/8"
1/2"
5/8"
DISTANCE FROM OUTLET OF 2nd STAGE
REGULATOR TO GAS VALVE INLET
MODEL
H250FDP
H350FDP
H400FDP
BTU
250,000
350,000
400,000
LINE MATERIAL
IRON
PIPE
TUBING
IRON PIPE
TUBING
IRON PIPE
TUBING
0 to 50 feet
1/2"
3/4"
3/4"
7/8"
3/4"
7/8"
It is
VERY IMPORTANT
when installing a propane heater on a two-stage regulation system to follow the gas line sizing chart below without
exception.
HIGH PRESSURE PROPANE GAS PIPE SIZING “FIRST STAGE”:
(Based upon gas pressure of 10 psig inlet pressure at a pressure drop of 1 psi.)
LOW PRESSURE PROPANE GAS PIPE SIZING “SECOND STAGE”:
(Based upon gas pressure of 11” w.c. inlet pressure at a pressure drop of 0.5”
w.c.)
