York DM036 Installation Manual

Also see for DM 036: Technical guide

Contents

York DM036 Installation Manual Manual pdf 15 page image

5011492-XIM-B-0815Johnson Controls Unitary Products 15Gas ConnectionThe gas supply line can be routed through the knockoutslocated on the front of the unit or through the opening providedin the unit's base. Refer to Figure 13 to locate these accessopenings. Typical supply piping arrangements are shown inFigures 5 and 6. All shaded items are field-supplied.If gas supply line is routed through the unit's base ensure thatthe burner assembly can be removed for maintenance withoutdisturbing the supply line. The supply piping and fittings must liebelow the bottom gas manifold to avoid interference with theburner assembly.Two grommets are shipped in the blower compartment (in partsbag taped to the blower housing) of every unit with gas heatand should be used in the knockouts when the gas pipingpenetrates the front of the unit.After the gas supply piping has been installed, the bottomopening in the unit should be sealed to prevent water fromleaking into the building.Gas piping recommendations:1. A drip leg and a ground joint union must be installed in thegas piping.2. When required by local codes, a manual shut-off valve mayhave to be installed outside of the unit.3. Use wrought iron or steel pipe for all gas lines. Pipecompound should be applied sparingly to male threadsonly.4. All piping should be cleaned of dirt and scale byhammering on the outside of the pipe and blowing out theloose dirt and scale. Before initial start-up, be sure that allof the gas lines external to the unit have been purged of air.5. The gas supply should be a separate line and installed inaccordance with all safety codes as prescribed under“Limitations”. After the gas connections have beencompleted, open the main shut-off valve admitting normalgas pressure to the mains. Check all joints for leaks withsoap solution or other material suitable for the purpose.NEVER USE A FLAME.6. The furnace and its individual manual shut-off valve mustbe disconnected from the gas supply piping system duringany pressure testing of that system at test pressures inexcess of 1/2 psig (3.48kPa).7. The furnace must be isolated from the gas supply pipingsystem by closing its individual manual shut-off valveduring any pressure testing of the gas supply pipingsystem at test pressures equal to or less than 1/2 psig(3.48kPa).8. A 1/8 inch NPT plugged tap, accessible for test gageconnection, must be installed immediately upstream of thegas supply connection to the furnace.L.P. Units, Tanks And PipingAll gas heat units are shipped from the factory equipped fornatural gas use only. The unit may be converted in the field foruse with L.P./propane gas with accessory kit model number1NP0440.All L.P./propane gas equipment must conform to the safetystandards of the National Fire Protection Association.For satisfactory operation, adequate L.P./propane gas pressuremust be provided at the unit manifold under full load.Maintaining proper gas pressure depends on three mainfactors:Natural gas may contain some propane. Pro-pane, being an excellent solvent, will quickly dis-solve white lead or most standard commercialcompounds. Therefore, a special pipe compoundmust be applied when wrought iron or steel pipeis used. Shellac base compounds such as Gas-kolac or Stalastic, and compounds such as Rec-torseal #5, Clyde's or John Crane may be used.FIRE OR EXPLOSION HAZARDFailure to follow the safety warning exactly could resultin serious injury, death or property damage.Never test for gas leaks with an open flame. use acommercially available soap solution made specificallyfor the detection of leaks to check all connections. A fireor explosion may result causing property damage,personal injury or loss of life.Figure 5: External Supply Connection External Shut-Off