H2O HC Series Installation, Operation And Maintenance Manual
                                                  | |
Contents
| 
SECTION 1: INTRODUCTION5 H2O BOILER HC SERIES IOM Manual1.4 Gas Lines1.4.1 Pilot Gas LineReferring to Figure 5, gas from the main supply line flows at the maximum pressure of 14” wc,through the manual valve into the pilot line. From the pressure regulator it will then flow throughthe safety shut off valves into the burner. The pilot pressure regulator is adjusted such that gasflows within 2” – 5” wc pressure into the first safety shut off valve. If pilot flame is notestablished within 5 seconds of the ignition trial time, the flame safeguard will shut off the pilotsafety gas valve(s).The pilot flame will ignite the air/gas mixture flowing through the burner within 5 seconds of themixture flowing into the burner. In some burner models, a direct ignition system is being usedwhich eliminates the need for pilot gas train.Figure 4: Pilot gas train1.4.2 Main Gas LineReferring to Figure 6, gas from the main supply line flows at a maximum pressure of 14” wc,through the manual gas valve into the main gas line. From the pressure regulator it will then flowthrough the two safety shut off valves, into the second manual shut off valve. Finally gas flowsthrough the gas adjustment butterfly valve into the burner where it is ignited by the pilot flame.The pressure regulator is adjusted such that the manifold gas pressure remains within 0.2 – 3.0”wc. Signals from the temperature controller are sent to the servomotor, which controls the openingof the butterfly valve and the air damper. Subsequently, the valve and damper are proportionatelyclosed or opened in order to decrease or increase the air/gas mixture flow into the burner.D-VAC Sales Inc. Email: dmann@dvachvac.com Tel: (516) 256-3131 www.dvachvac.com |
manualsdatabase
Your AI-powered manual search engine