A.O. Smith 3400 - Manual (Page 4)

4
GROUNDING INSTRUCTIONS
This boiler must be grounded in accordance with the National
Electrical Code, Canadian Electrical Code and/or local codes.
Boiler is polarity sensitive; correct wiring is imperative for proper
operation.
This boiler must be connected to a grounded metal, permanent
wiring system, or an equipment grounding conductor must be
run with the circuit conductors and connected to the equipment
grounding terminal or lead on the boiler.
INLET WATER CONSIDERATIONS
For hot water heating systems using the XB model, the circulating
pump is NOT provided on standard models (optional) and must
be field installed.
CORRECT GAS
Make sure the gas on which the boiler will operate is the same as
that speci fied on the boiler rating plate. Do not install the boiler if
equipped for a different type of gas; con sult your supplier.
PRECAUTIONS
If the unit is exposed to the following, do not operate until
all corrective steps have been made by a qualified service
technician:
1. Exposure to fire.
2. If damaged.
3. Firing without water.
4. Sooting.
If the boiler has been exposed to flooding, it must be replaced.
LIQUEFIED PETROLEUM GAS MODELS
Boilers for propane or liquefied petroleum gas (LPG) are different
from natural gas models. A natural gas boiler will not function safely
on propane (LP) gas and no attempt should be made to convert
a boiler from natural gas to propane (LP) gas.
Propane (LP) gas must be used with great caution. It is highly
explosive and heavier than air. It collects first in the low areas
making its odor difficult to detect at nose level. If propane (LP)
gas is present or even suspected, do not attempt to find the cause
yourself. Leave the building, leaving doors open to ventilate, then
call your gas supplier or qualified agency. Keep area clear until
a service call has been made.
At times you may not be able to smell an propane (LP) gas
leak. One cause is odor fade, which is a loss of the chemical
odorant that gives propane (LP) gas its distinctive smell. Another
cause can be your physical condition, such as having a cold or
diminishing sense of smell with age. For these reasons, the use
of a propane gas detector is recommended.
If you experience an out of gas situation, do not try to relight
appliances yourself. Call your local qualified service technician.
Only trained propane (LP) gas professionals should conduct the
required safety checks in accordance with industry standards.
HIGH ALTITUDE INSTALLATIONS
Rated inputs are suitable up to 2000 feet (610 m) elevation for
Propane and 10,100 feet (3079 m) for Natural gas. Consult the
factory for Propane installation at altitudes over 2000 feet (610
m).
FIELD INSTALLED COMPONENTS
When installing the boiler, the follow ing compo nents must be
installed:
• Circulating Pump (Hyd ronic)
• Remote Temperature Sensor/Header Sensor
• Storage Tank (Temperature & Pressure Relief Valve)
GENERAL SAFETY