Installation manual

Natural Gas Generator Set Installation Manual-GF Series
Doc. 17855, Rel. 03/2014
3-10
3.9 Air Fuel Setting and Emission Mea-
surement
This procedure shall be performed at the time of
installation of the natural gas 3-way catalyst, after any
re-assembly, and periodically per schedule provided
by manufacturer throughout the life of the 3-way cata-
lyst.
Follow the air fuel ratio controller’s instructions and
engine manufacturer’s instructions to set the air fuel
ratio. Analyze the engine exhaust gases with a Nox,
CO, or HC analyzer down stream of the 3-way cata-
lyst.
If the emissions do not meet specifications, replace
the catalyst module(s) as needed.
3.10 Ventilation and Cooling
Generator sets dissipate heat and fumes that must be
removed by proper cooling and ventilation.
Generator sets in factory-mounted housings for
outdoor installation are designed for proper cooling
and ventilation.
Indoor installations require careful design with
respect to cooling and ventilation. In an indoor instal-
lation, all radiator cooling air must be discharged out-
doors. Duct adapter kits are available. See Figure 3-6
for a typical indoor installation.
WARNING
Engine or radiator cooling air may carry deadly
carbon monoxide gas which can cause asphyxia-
tion and death. All engine or radiator cooling air
must be discharged outdoors. Do not use it for
heating a room or compartment.
3.11 Vents and Ducts
For indoor installations, locate vents so incoming air
passes through the immediate area of the installation
before exhausting. Install the air outlet higher than
the air inlet to allow for convection air movement.
Size the vents and ducts so they are large enough to
allow the required flow rate of air. The ”free area” of
ducts must be as large as the exposed area of the
radiator. Refer to the genset data sheet for the airflow
requirements and allowed airflow restriction.
3.12 Oil Reservoir (Optional)
5 or 10 gallon Oil Tanks are optional on some units to
allow for extended service intervals between mainte-
nance. These tanks are typically plumbed to an Oil
Maintainer Switch that controls the flow into the
engine oil pan. It is imperative the switch is function-
ing properly without obstruction and if the switch is
vented, the vent is not obstructed as well. The tank
should be filled with oil per Engine Manufacturer
guidelines.
3.13 Dampers
Dampers or louvres protect the generator set and
equipment room from the outside environment. Their
operation of opening and closing should be controlled
by operation of the generator set.
In cooler climates movable or discharge dampers are
used. These dampers allow the air to be recirculated
back to the equipment room. This enables the equip-
ment room to be heated while the generator set
engine is still cold, increasing the engine efficiency.
3.14 Radiator Set Cooling Requirements
Radiator set cooling air is drawn past the control end
of the set by a pusher fan that blows air through the
radiator (Figure 3-6). Locate the air inlet to the rear of
the set. Make the inlet vent opening 1-1/2 times
larger than the radiator area.
NOTE: Louvers and screens over air inlet and outlet
openings restrict air flow and vary widely in perfor-
mance. A louver assembly with narrow vanes, for
example, tends to be more restrictive than one with
wide vanes. The effective open area specified by the
louver or screen manufacturer should be used.
Locate the cooling air outlet directly in front of the
radiator and as close as possible. The outlet opening
must be at least as large as the radiator area. Length
and shape of the air outlet duct should offer minimum
restriction to airflow.
Attach a canvas or sheet metal duct to the air outlet
opening using screws and nuts so duct can be
removed for maintenance purposes. The duct pre-
vents recirculation of heated air. Before installing the
duct, remove the radiator core guard.