North America • Latin America • India • Europe / Middle East / Africa • China • Pacific Rim
armstrong
international.com
Designs, materials, weights and performance ratings are approximate and subject to change without notice. Visit
armstrong
international.com for up-to-date information.
16
Gas Valve Setup
Figure 3.2 - ABH Models 299–399
Figure 3.3 - ABH Model 599
Gas Connection - Continued
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 ABH (see diagram).
• Gas pressure for minimum load should be measured the moment after the gas valve opens on a single ABH, 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.
See Start-Up Procedures Section (page 36) Before Continuing