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All Raypak heaters are National Board Approved, and
design-certified and tested by the Canadian Stan-
dards Association (CSA) for the U.S. and Canada.
Each heater is constructed in accordance with Section
IV of the American Society of Mechanical Engineers
(ASME) Pressure Vessel Code, and bears either the
ASME “H” stamp for boilers or “HLW” stamp for water
heaters. The heater also complies with the latest edi-
tion of ASHRAE 90.1 Standard.
Rated inputs are suitable for up to 4,500 ft elevation
without de-rating. Consult the factory for installations
at altitudes over 4,500 ft above sea level.
Component Locations
Installation Codes
Installations must follow these codes:
• Local, state, provincial, and national codes, laws,
regulations and ordinances
• National Fuel Gas Code, ANSI Z223.1/NFPA 54 –
latest edition (NFGC)
• National Electrical Code, ANSI/NFPA 70 - latest
edition (NEC)
For Canada only: CAN/CGA B149 Installation Code
(B149.1) and CSA C22.1 C.E.C. Part 1 (C22.1)
Gas Supply
This heater will be connected to 2 different gas sup-
plies (Natural Gas and Propane Gas).
Each gas piping must have a separate sediment trap
ahead of the gas controls. Pounds-to-inches regula-
tors must be installed to reduce the gas supply
pressure to a maximum of 10.5 in. WC for natural gas
and 13.0 in. WC for propane gas. The regulator should
be placed a minimum distance of 10 times the pipe
diameter upstream of the heater gas controls.
The heater must be isolated from the gas supply pip-
ing system by closing the manual shut-off valves
during any pressure testing of the gas supply piping
system at test pressures equal to or less than 1/2 psi
(3.45 kPa). Relieve test pressure in the gas supply line
prior to reconnecting the heater and its manual shut-off
valves to the gas supply lines. FAILURE TO FOLLOW
THIS PROCEDURE MAY DAMAGE THE GAS
VALVES. Over-pressurized gas valves are not cov-
ered by warranty. The heater and its gas connections
shall be leak-tested before placing the appliance in
operation. Use soapy water for leak test. DO NOT use
an open flame.
WARNING: Altering any Raypak pressure vessel
by installing replacement heat exchangers, tube
bundle headers, or any ASME parts not manufac-
tured and/or approved by Raypak will instantly void
the ASME and CSA ratings of the vessel and any
Raypak warranty on the vessel. Altering the ASME or
CSA ratings of the vessel also violates national,
state, and local approval codes.
Fig. 1: Component Locations – Back
CAUTION: The heater must be disconnected from
the gas supply during any pressure testing of the gas
supply system at test pressures in excess of 1/2 psi
(3.45 kPa).
FlexGas cover not shown for clarity
NOTE: Maintain upright orientation of all compo-
nents as shown in Fig. 1.