Gas Pressure
Test Point
Gas Pressure
Test Point
Gas Pressure
Test Point
14
PART 3. GAS CONNECTION
D. GAS VALVE SETUP (continued)
Please see Part 6—Start-Up Procedures on page 36 before continuing!
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.
(FIGURE 3-4) GAS PRESSURE TESTING POINTS
