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Raypak strongly recommends that this manual be
reviewed thoroughly before installing your Hi Delta
heater equipped with FlexGas. Raypak also recom-
mends that the appropriate Hi Delta Installation and
Operating Instruction manual (1000.501 for 302B-
902B or 1000.511 for 992B – 2342B) be thoroughly
read before attempting to install these heaters. Fac-
tory warranty does not apply to heaters that have been
improperly installed or operated. (Refer to the warran-
ty at the back of the standard Hi Delta manuals.)
Installation and service must be performed by a quali-
fied installer, service agency or gas supplier. If, after
reviewing these manuals, you still have questions
which these manuals do not answer, please contact
the manufacturer or your local Raypak representative.
Thank you for purchasing a Raypak product. We hope
you will be satisfied with the high quality and durability
of our equipment.
Model Identification
The model identification number and heater serial
number are found on the heater rating plate located on
the lower right outside jacket of the heater. The model
number will have the form H9 1262BD or similar
depending on the heater size and configuration. The
letter(s) in the first group of characters identifies the
application (H = Hydronic Heating, WH = Domestic
Hot Water (DHW), P = Pool). The number which fol-
lows identifies the firing mode (1 or 4 = on-off, 3 =
2-stage, 8 = 3-stage and 9 = 4-stage). NOTE: Not all
these firing options are available on all heaters.
Refer to the Hi Delta manual for available firing
options. The second group of characters identifies the
size of the heater (four numbers representing the
approximate MBTUH input), and, where applicable, a
letter, indicating the manufacturing series. The final
character is the letter “D” which designates the heater
as a FlexGas equipped heater.
Ratings and Certifications
Standards:
• ANSI Z21.13 · CSA 4.9 - latest edition, Gas-Fired
Hot Water Boilers
• CAN 3.1 - latest edition, Industrial and Commer-
cial Gas-Fired Package Boilers
• ANSI Z21.56 · CSA 4.7 - latest edition, Gas-Fired
Pool Heaters
• ANSI Z21.10.3 · CSA 4.3 - latest edition, Gas
Water Heaters
3
WARNING: Do not use this heater if any part has
been under water. Immediately call a qualified serv-
ice technician to inspect the heater and to replace
any part of the control system and any gas control
which has been under water.
WARNING: Should overheating occur or the gas
supply valve fail to shut off, do not turn off or discon-
nect the electrical supply to the heater. Instead, shut
off the gas supply at a location external to the heater.
WARNING: Risk of electrical shock. More than one
disconnect switch may be required to de-energize
the equipment before servicing.
WARNING: This FlexGas heater is intended for
operation on Natural Gas as the primary fuel. DO
NOT use this heater on Propane Gas as the primary
fuel.
Model
Input
(MBTUH)
Pipe Size
(Nat)
Pipe Size
(LP)
302BD 300 1-
1
⁄4”
3
⁄4”
402BD 399 1-
1
⁄4”
3
⁄4”
502BD 500 1-
1
⁄4”
3
⁄4”
652BD 650 1-
1
⁄4”
3
⁄4”
752BD 750 1-
1
⁄4” 1-
1
⁄4”
902BD 900 1-
1
⁄4” 1-
1
⁄4”
992BD 990 2” 1-
1
⁄4”
1262BD 1260 2” 1-
1
⁄4”
1532BD 1530 2” 1-
1
⁄4”
1802BD 1800 2” 1-
1
⁄4”
2072BD 2070 2” 1-
1
⁄4”
2342BD 2340 2” 1-
1
⁄4”
Table 1: FlexGas Specifications