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INITIAL START-UP
Figure 4.1
1/8" Gas Plug Location
4.2.3 PREPARING THE FLUE VENT
PROBE HOLE
1. Locate and remove the plug on the left or
right side of the exhaust manifold (see
Figure 4.2).
2. Adjust the stop on the combustion analyzer
probe, if so equipped, so that it extends
approximately midway into the flue gas flow.
Do not insert the probe at this time.
NPT PLUG
(REMOVE FOR COMBUSTION
ANALYZER PROBE)
VENT STARTER
SECTION
Figure 4.2
Analyzer Probe Hole Location
4-2
1/8" NPT
PLUG (INSTALL
MANOMETER HERE)
EXHAUST MANIFOLD
4.2.4 INSTALLING THE DIFFERENTIAL
REGULATOR ADJUSTMENT TOOL FOR
NATURAL GAS UNIT.
1. Remove the cap from the differential
pressure regulator (see Figure 4.3).
2. Place the gasket from the regulator cap onto
the regulator adjustment tool.
3. Prior to installing the tool on the regulator,
pull up the screwdriver blade of the tool.
Then thread the tool into the regulator and
hand tighten.
4. Engage the tool's screwdriver blade into the
regulator's adjustment screw slot.
REGULATOR CAP
CAP GASKET
DIFFERENTIAL
PRESSURE
REGULATOR
Figure 4.3
Differential Regulator Adjustment Tool
Installation For Natural Gas Unit
4.3 NATURAL GAS COMBUSTION
CALIBRATION
The Benchmark ships combustion calibrated
from the factory. Recalibration as part of a start-
up is necessary due to altitude, gas BTU
content, gas supply piping and supply gas
pressure. Factory test data sheets are shipped
with each unit as a reference.
REGULATOR
ADJUSTMENT
TOOL (P.N. 123643)
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