Aerco Benchmark G-00-711, User Manual

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INSTALLATION
2-8
2.11.2 COMBUSTION AIR FROM INSIDE
THE BUILDING
When combustion air is provided from within the
building, it must be supplied through two
permanent openings in an interior wall. Each
opening must have a free area of not less than
one square inch per 1000 BTUH of total boiler
input. The free area must take into account any
restrictions such as louvers.
2.11.3 SEALED COMBUSTION
The BENCHMARK boiler is UL listed for 100%-
sealed combustion and can be ordered with a
sealed combustion option or without. Units
ordered in the sealed combustion configuration
will come with an air inlet assembly installed on
the blower. The knockout at the top of the boiler
must be removed and the combustion air
ductwork must be attached to the 6" x 8" adapter
that is provided just below the knockout.
'In a sealed combustion air application, the
combustion air ducting pressure losses must be
taken into account when calculating the total
maximum allowable venting run. See the
AERCO Venting and Combustion Air Guide, GF-
2050. When using the boiler in a sealed
combustion air configuration, each unit must
have a minimum 8" diameter connection at the
unit.
2.12 UNIT INITIAL FILL
Before filling the unit’s shell for the first time,
blow out all the connecting water and gas piping
and check thoroughly for leaks. Rinse all
soapsuds from the gas piping with clean water.
Do not allow water to get on the control panel or
electrical connections. Check that all installation
procedures have been completed before filling
the unit.
The following steps should be followed when
filling the unit:
1. Close the unit’s drain valve.
2. Open the system return and supply valves to
the boiler.
3. Make certain that the system pressure
reducing fill valve is open to replenish
pressure in the system as the unit fills.
4. Observing the pressure/temperature gauge,
supplied with the unit, allow pressure to
slowly build up in the unit.