Installation Guide

Pomona, CA Clemmons, NC Nashville, TN
Tel: [phone] www.haywardpool.com
USE ONLY HAYWARD GENUINE REPLACEMENT PARTS
20
Gas Supply and Piping :
To properly size the gas piping for the heater, refer to Tables 10, 11, 12, and 13, depending on natural or propane gas, and single-stage or
2-stage regulation. Follow local gas codes for proper gas line material selection (copper, iron, plastic, etc.). It is VERY IMPORTANT when
installing a propane heater on a 2-stage regulation system to follow the gas line sizing data in Table 13 without exception.
Distance from Gas
Meter to Heater Gas
Valve Inlet
Model H150FDN H200FDN H250FDN H300FDN H350FDN
btu/hr input 150,000 200,000 250,000 300,000 350,000
Line MaterialI ron or Plastic PipeI ron or Plastic Pipe Iron or Plastic Pipe Iron or Plastic Pipe Iron or Plastic Pipe
0 to 50 ft 3/4" 1" 1" 1-1/4" 1-1/4" "
50 to 100 ft 1" 1" 1-1/4" 1-1/4" 1-1/4" "
100 to 200 ft 1-1/4" 1-1/4" 1-1/4" 1-1/2" 1-1/2" "
200 to 300 ft 1-1/4" 1-1/4" 1-1/2" 2" 2"
H400FDN
400,000
Iron or Plastic Pipe
1-1/4
1-1/4
1-1/2
2"
Table 10
Natural Gas Pipe Sizing, Low-Pressure, Single-Stage Regulation
Table 11
Propane Gas Pipe Sizing, Low-Pressure, Single-Stage Regulation
Table 12
Natural Gas Pipe Sizing, High-Pressure, 2-Stage Regulation
Based upon an inlet gas pressure of 0.5 psig or less at a pressure drop of 0.5 in-wc
Distance from
Tank Regulator
Outlet to
Heater Gas
Valve Inlet
Model H150FDP H200FDP H250FDP H300FDP H350FDP H400FDP
btu/hr input 150,000 200,000 250,000 300,000 350,000 400,000
Line
Material
Iron Pipe Tubing Iron Pipe Tubing Iron Pipe Tubing Iron Pipe Tubing Iron Pipe Tubing Iron Pipe Tubing
0 to 50 ft 3/4" 7/8" 3/4" 7/8" 1" 1-1/8" 1" 1-1/8" 1" 1-1/8" 1" ---
50 to 100 ft 3/4" 1-1/8" 1" 1-1/8" 1" 1-1/8" 1" --- 1-1/4" --- 1-1/4" ---
100 to 200 ft 1" 1-1/8" 1" --- 1-1/4" --- 1-1/4" --- 1-1/4" --- 1-1/4" ---
200 to 300 ft 1" --- 1-1/4" --- 1-1/4" --- 1-1/4" --- 1-1/4" --- 1-1/2" ---
Based upon an inlet gas pressure of 11 in-wc at a pressure drop of 0.5 inch w.c.
Distance from Outlet
of 1st Stage Regulator
to Inlet of 2nd Stage
Regulator
Model H150FDN H200FDN H250FDN H300FDN H350FDN H400FDN
btu/hr input 150,000 200,000 250,000 300,000 350,000 400,000
Line Material
Iron or Plastic
Pipe
Iron or Plastic
Pipe
Iron or Plastic
Pipe
Iron or Plastic
Pipe
Iron or Plastic
Pipe
Iron or Plastic
Pipe
First Stage *
0 to 50 ft 1/2" 1/2" 1/2" 1/2" 1/2" 1/2"
50 to 100 ft 1/2" 1/2" 1/2" 1/2" 3/4" 3/4"
100 to 150 ft 1/2" 1/2" 1/2" 3/4" 3/4" 3/4"
Second
Stage **
0 to 10 ft 3/4" 3/4" 3/4" 3/4" 3/4" 3/4"
* Based upon an inlet gas pressure of 2 psig at a pressure drop of 1 psi
** Based upon an inlet gas pressure of 10 in-wc at a pressure drop of 0.5 in-wc
H500FDN
500,000
Iron or Plastic Pipe
2"
2"
"1-1/2
"1-1/4
H500FDN
500,000
Iron Pipe
Tubing
1"
1-1/4"
1-1/4"
1-1/2"
---
---
---
H500FDN
500,000
Iron or Plastic
Pipe
1/2"
3/4"
3/4"
1"
---