AAON LZ Series, Installation Operation & Maintenance

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Boiler Gas Connection
Before making gas connection, make sure the
boiler is being supplied with the type of fuel
shown on the boiler nameplate.
Table 2 and Table 3 show the gas connection
size and type (NPT or flanged) provided
along with the required inlet gas pressure for
the unit. Refer to feature B on the LZ Series
unit feature string to determine which line of
the table to use. For example, a unit with
feature B = A3CC will have a 2” NPT gas
connection and require an inlet gas pressure
in the range of 6-14” W.C.
Use only pipe sealing compound that is
compatible with propane gases on all
threaded connections. Apply sparingly only
to the male threads of the pipe joints so that
the pipe sealing compound does not block
any gas flow.
Before being placed in operation, the boiler
and all gas piping connections must be
checked for leaks. The boiler must be
disconnected from the gas supply piping
system during any pressure testing of the
system at pressures in excess of .5 psig (14”
W.C.). The boiler must be isolated from the
gas supply piping system by closing the
manual shutoff valve during any pressure
testing of the system at pressures equal to or
less than .5 psig (14” W.C.).
Some leak test solutions, including soap and
water, may cause corrosion. These solutions
should be rinsed off with water after testing.
Boiler Air Intake / Vent Piping
Each boiler requires the installation of air
intake and vent piping. This piping has been
removed for shipping purposes. All piping
must be reinstalled according to the
instructions provided in this section prior to
boiler operation.
All boilers must be vented and supplied with
combustion and ventilation air as described
in this section and in the Lochinvar
Installation & Operation Manual included
with the boiler. Ensure the vent and air
piping and combustion air supply comply
with instructions regarding vent system, air
system, and combustion air quality.
Inspect finished vent and air intake piping
thoroughly to ensure all are airtight and
comply with the instructions provided and
with all requirements of applicable codes.
Failure to apply sealing compound as
detailed can result in property
damage, personal injury, or death.
WARNING
DO NOT use matches, candles, open
flames, or other ignition sources to
check for gas leaks. Use only
approved leak detection methods.
Failure to comply with this warning
can result in property damage,
personal injury, or death.
WARNING
Failure to provide a properly installed
vent and air system can result in
property damage, personal injury, or
death.
WARNING