Accessing The Analyzer Probe Port - Watts Aerco Benchmark OMM-0124 Installation And Start-Up Manual

Benchmark 5000-6000 Boiler Installation & Startup Manual
SECTION 4: INITIAL START-UP
To monitor the gas pressure on the downstream side of the SSOV during Combustion
Calibration (in Section 4.5.1 and/or 4.5.2, below), install the 16" W.C. (4.0 kPa) manometer(s)
as described in the following steps:
Gas Supply Manometer Installation Instructions
1. Turn off the main gas supply upstream of the unit.
2. Remove the front panel from the boiler to access the gas train components.
3. To monitor the gas pressure on the downstream side of the SSOV during Combustion
Calibration (section 4.5.1 and/or 4.5.2, below), locate the port on the side of the High Gas
Pressure switch, as shown in Figure 4-1, and loosen the screw inside a few turns to open
it. Do not remove this screw completely. Alternatively, you can remove the 1/4 inch plug
shown in Figure 4-1, above, and install a hose barb fitting in that location.
4. Attach one end of the plastic tubing to the port or barbed fitting and the other end to the 0
to 16 inch W.C. (0 to 4.0 kPa) manometer.

4.2.3 Accessing the Analyzer Probe Port

The unit contains a 1/4" NPT port on the side of the exhaust manifold as shown in Figure 4-2.
Prepare the port for the combustion calibration as shown below.
Analyzer Probe Port Access Instructions
1. Refer to Figure 4-2 and remove one of the four 1/4" NPT plugs (P/N 9-22) from the desired
location on the exhaust manifold. There are four 1/4" NPT ports, two in the front of the
exhaust manifold and two in the rear, on the left and right sides.
2. If necessary, adjust the stop on the combustion analyzer probe; if using the front port, the
probe should be inserted as far as possible. DO NOT install the probe at this time.
FRONT
OMM-0123_E • GF-207 • 12/17/2019
ANALYZER PROBE PORTS WITH 1/4" PLUGS
2 IN FRONT
PARTIAL RIGHT SIDE VIEW
Figure 4-2: Analyzer Probe Hole Locations
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
CONDENSATE
2 IN REAR
REAR
EXHAUST
MANIFOLD
DRAIN
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