22
ONLY USE GENUINE HAYWARD REPLACEMENT PARTS
51300803801 REV B
GAS SUPPLY:
The heater is shipped from the factory with the gas connection located on the left side of the heater cabinet. The gas connection can also be
configured from the right, see instructions for changing the heater’s connection orientation in the
REVERSIBLE WATER CONNECTIONS
sec-
tion on page 23 . Insert the pipe to the gas valve through the grommet in the cabinet side. A union should be installed outside the heater cabi-
net for easy removal of the gas manifold assembly during service. A CSA certified main gas shutoff valve must be installed outside the cabinet
and within 6 feet of the heater. This valve must have an I.D. large enough to supply the proper amount of gas volume to the heater. See Figure
11. Reduction of gas supply pipe or tubing to the inlet to the heater gas valve must be made at the valve only and must match the valve inlet
size (3/4” NPT). If more than one appliance is installed on the gas line, consult the local gas company or appropriate technical service for the
proper gas line size.
CAUTION:
Apply joint compound (pipe dope) sparingly and only to the male threads of pipe joints. Do not apply joint compound to the
first two threads. Use joint compounds resistant to the action of liquefied petroleum gas. Do not overtighten the gas inlet pipe or damage
may result.
NOTICE:
Use Only CSA approved flexible outdoor gas appliance connectors marked with BTUH capacity (which must be equal to or
greater than the heater rated input) and appropriate gas type (natural and/or LP).
NATURAL GAS:
The gas meter must have the capacity to supply enough
gas to the pool heater and any other gas appliances if they are on the same
pipeline (Example: 225 meter = 225,000 BTUH). If doubt exists as to the meter
or regulation sizes, consult the local gas utility for assistance. Natural gas must
be “pipeline quality” supplied from a natural gas utility company.
NOTICE:
Manufacturer is not responsible for heaters that are damaged
if connected to a natural gas well.
PROPANE GAS:
All propane gas tanks must be located outdoors and
away from pool/spa structure and in accordance with the standard for storage
and handling of propane gas, ANSI/NFPA 58 (latest edition) and applicable
local codes. If the propane gas tank is installed underground, the discharge of
the regulator vent must be above the highest probable water level. Propane
tanks must have sufficient capacity to provide adequate vaporization for the full
capacity of the equipment at the lowest expected temperatures. Consult a pro-
pane expert for accurate pipe and pressure sizing. Make sure that 1st and 2nd stage regulators are large enough to handle the BTUH input
listed for the heater(s) being used
NOTICE:
Manufacturer is not responsible for heaters that soot due to improper gas line or propane tank sizing or regulation control re-
sulting in improper gas volume.
GAS SUPPLY AND PIPING:
To properly size the gas piping for the heater, refer to Table 10. Follow local gas codes for proper gas line materi-
al 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 10 without exception.
Table 10: Pipe Sizing (dia. In inches) for 400,000 Btu/hr Gas Appliance
Regulation Type
Low-Pressure,
Single-Stage
High-Pressure,
2-Stage
Fuel Type
Natural Gas
LP
Natural
Gas
LP
Gas Line Material
Iron or Plastic
Pipe
Iron Pipe
Iron or
Plastic Pipe Iron Pipe
Tubing
Total piping length
or length of First
Stage*
0 to 50
1-1/4
1
1/2
1/2
1/2
50 to 100
1-1/4
1-1/4
3/4
1/2
5/8
100 to 150
N/A
N/A
3/4
1/2
5/8
200 to 300
2
1-1/2
N/A
N/A
N/A
Second Stage**
0 to 10
N/A
N/A
3/4
3/4
7/8
Distance from tank
regulator to gas valve
inlet (ft) or 2nd stage
regulator
100 to 200
1-1/2
1-1/4
N/A
N/A
N/A
Figure 11: Gas Piping with Shut Off & Trap