34000 Autry Street, Livonia, MI 48150 | 800.968.5530 | Fax 734.419.0209 | www.hamiltonengineering.com | LIT91127US REV 5/2018
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Proper gas volume and pressure is critical to the operation of any high efficiency appliance. There are three
types of measurements that must be taken to provide the data to insure product performance:
• Lock-up pressure (pressure in gas piping at appliance inlet with no load) may not exceed 14" wc.
at any time!
• Minimum load at ignition of a single unit in a multiple unit rack
• Maximum load – all appliances on at full fire that are being tested and any other gas fired
equipment on the same gas supply.
How and where to measure:
• All gas pressure tests must be taken at the gas manifold inlet, external to the EVO (see diagram).
• Gas pressure for minimum load should be measured the moment after the gas valve opens on
a single EVO, and recorded.
• Gas pressure for maximum load shall be measured with all units on at full fire and all other
connected loads on that gas supply running
• Gas pressure drop shall not exceed 1" wc. between minimum load and maximum load
as described above.
Please see Part 6 - Start-Up Procedures on page 38 before continuing!
Gas Pressure
Test Point
Gas Pressure
Test Point
Gas Pressure
Test Point
(FIGURE 3-4) GAS PRESSURE TESTING POINTS
GAS CONNECTION