PLACE THESE INSTRUCTIONS ADJACENT TO BOILER AND NOTIFY OWNER TO KEEP FOR FUTURE REFERENCE
COMMERCIAL GAS-FIRED BOILERS
Supplement Manual to 321078-000 Instruction Manual
PRINTED IN THE U.S.A. 0
9
11
321488-000
Thank you for buying this energy efficient boiler.
We appreciate your confidence in our products.
MODELS: UP-FLOW MODELS
HW 420/520/670
SERIES 302/303
WITH ELECTRONIC INTERMITTENT
PILOT IGNITION
SUPPLEMENT MANUAL to
321078-000 INSTRUCTION MANUAL
25589 Highway 1
McBee, SC 29101
WARNING: If the information in these
instructions is not followed exactly, a fire
or explosion may result causing property
damage, personal injury or death.
Do not store or use gasoline or other
flammable vapors and liquids in the
vicinity of this or any other appliance.
WHAT TO DO IF YOU SMELL GAS:
Do not try to light any appliance.
Do not touch any electrical switch; do
not use any phone in your building.
Immediately call your gas supplier
from a neighbor’s phone. Follow the
gas supplier’s instructions.
If you cannot reach your gas supplier,
call the fire department.
Installation and service must be
performed by a qualified installer,
service agency or the gas supplier.
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This supplement is to be used when the authority having
jurisdiction requires that the installation must conform to the
standard for Controls and Safety Devices for Automatically
Fired Boilers, ASME CSD-1. The rules of the code cover the
requirements for the assembly, operation and maintenance of
controls and safety devices on an automatically operated boiler.
An installation that conforms with the instruction manual and
the specific requirements set forth in this supplement is said to
be in compliance with ASME CSD-1.
The gas control string that meets the requirements of CSD-1 is
shown in Figure 1 of this supplement. The boiler is fitted with a
single stage (high fire) control. This control is the same found
on standard HW units with the addition of extra valving that
allows for periodic leak testing.
A two trial ignition module, United Technologies 1003-617A
(AOS P/N 320941-000) along with United Technologies 1145-
2 CSD-1 Control Lockout Module (AOS P/N 320942-000) are
installed in place of Honeywell S86XX Module used on HW
standard models. The two trial module's alarm output will be
energized if the pilot burner does not ignite within 15 seconds
of two trials, which will trigger the UT 1145-2 Control Lockout
to shut down the power to the ignition module and to illuminate
the red LED. If the lockout does occur, the red reset button on
the control lockout module must be pressed before the ignition
is again operative.
CSD - 1 MODELS
