Installing A Gas Supply Manometer - Watts AERCO Edge CFR 3000 Operator's And Service Manual

SECTION 4 INITIAL START-UP

4.2.2 Installing a Gas Supply Manometer

A 16" W.C. (4.0 kPa) gas supply manometer (or gauge) is used in the following ways:
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Mounted on the upstream side of the SSOV to verify that the gas supply pressure is within the
required range of 4" W.C. and 14" W.C.
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Mounted on the downstream side of the SSOV to monitor the gas pressure during the
Combustion Calibration procedure, described in Sections 4.4.1 (Natural Gas).
Figure 4-1 shows where the manometer is installed on both upstream and downstream locations.
To Install the Gas Supply Manometer:
1. Turn off the main gas supply upstream of the unit.
2. Remove the top panel and/or front panel from the boiler to access the gas train.
3. Remove the 1/4" NPT plug from the leak detection ball valve on the upstream or downstream side
of the SSOV, as needed during testing, as shown in Figure 4-1.
4. Install an NPT-to-barbed fitting into the tapped plug port.
5. Attach one end of the plastic tubing to the barbed fitting and the other end to the manometer.
Figure 4-1: Gas Train Components and Instrument Connections
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.
3. Connect manometer directly to the Low and High Gas Pressure Switches (Figure 4-1).
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