User Manual

Hayward Pool Products (Australia) Pty Ltd.
Tel: 1300 POOLS1 www.hayward-pool.com.au
USE ONLY HAYWARD GENUINE REPLACEMENT PARTS
15
Gas Supply and Piping:
Refer to the charts below in Figure 6 for gas pipe sizing for low pressure natural gas, low pressure propane gas, two-stage natural gas and two-
stage propane gas systems.
Figure 6: GAS PIPE SIZE
Follow local gas codes for proper gas line material selection (copper, iron, plastic, etc.)
LOW PRESSURE NATURAL GAS PIPE SIZING: (Based upon an inlet gas pressure of 3.45 kPa or less at a pressure drop of 125 Pa)
Distance from Gas
Meter to Heater Gas
Valve Inlet
Model H150FDAU H250FDAU H400FDAU
MJ/hr input 158 264 422
Line Material Iron or Plastic Pipe Iron or Plastic Pipe Iron or Plastic Pipe
0 to 15 m 3/4” 1” 1-1/4”
15 to 30 m 1” 1-1/4” 1-1/4”
30 to 60 m 1-1/4” 1-1/4” 1-1/2”
60 to 90 m 1-1/4” 1-1/2” 2”
Distance from Outlet of
1st Stage Regulator to
Inlet of 2nd Stage
Regulator
Model H150FDAU H250FDAU H400FDAU
MJ/hr input 158 264 422
Line Material Iron or Plastic Pipe Iron or Plastic Pipe Iron or Plastic Pipe
0 to 15 m 1/2” 1/2” 1/2”
15 to 30 m 1/2” 1/2” 3/4”
30 to 45 m 1/2” 1/2” 3/4”
Distance from Outlet
of 2nd Stage
Regulator to Heater
Gas Valve Inlet
Model H150FDAU H250FDAU H400FDAU
MJ/hr input 158 264 422
Line Material Iron or Plastic Pipe Iron or Plastic Pipe Iron or Plastic Pipe
0 to 3 m 3/4” 3/4” 3/4”
Distance from Tank
Regulator Outlet to
Heater Gas Valve Inlet
Model H150FDAU H250FDAU H400FDAU
MJ/hr input 158 264 422
Line Material Iron Pipe Tubing Iron Pipe Tubing Iron Pipe Tubing
0 to 15 m 3/4” 7/8” 1” 1-1/8” 1” -
15 to 30 m 3/4” 1-1/8” 1” 1-1/8” 1-1/4” -
30 to 60 m 1” 1-1/8” 1-1/4” - 1-1/4” -
60 to 90 m 1” - 1-1/4” - 1-1/2” -
LOW PRESSURE PROPANE GAS PIPE SIZING: (Based upon an inlet gas pressure of 2.75 kPa or less at a pressure drop of 125 Pa)
HIGH PRESSURE NATURAL GAS PIPE SIZING “FIRST STAGE”: (Based upon an inlet gas pressure of 13.8 kPa or less at a pressure drop of 6.8 kPa)
LOW PRESSURE NATURAL GAS PIPE SIZING “SECOND STAGE”: (Based upon an inlet gas pressure of 2.5 kPa or less at a pressure drop of 125 Pa)
HIGH PRESSURE “2-STAGE” SYSTEMS