York DHG180 Installation Instruction

Also see for SUNLINE DHG 180: Installation instruction

York DHG180 Installation Instruction Manual pdf 8 page image

035-17233-000-C-07028 Unitary ProductsCOMBUSTION DISCHARGEThe products of combustion are discharged horizontallythrough two screened (hooded) openings on the upper gasheat access panel.GAS PIPINGProper sizing of gas piping depends on the cubic feet perhour of gas flow required, specific gravity of the gas and thelength of run. National Fuel Gas Code Z223.1 should be fol-lowed in all cases unless superseded by local codes or gasutility requirements. Refer to Table 5.The heating value of the gas may differ with locality. Thevalue should be checked with the local gas utility.NOTE: There may be a local gas utility requirement specify-ing a minimum diameter for gas piping. All units require a 1inch pipe connection at the entrance fitting.GAS CONNECTIONThe gas supply line can be routed through the knockoutslocated on the front of the unit or through the opening pro-vided in the unit's base. Refer to Figure 10 to locate theseaccess openings.Typical supply piping arrangements are shown in Figures 6and 7. All shaded items are field-supplied.Two grommets are shipped in the blower compartment (inparts bag taped to the blower housing) of every unit with gasheat and should be used in the knockouts when the gas pip-ing penetrates 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 inthe gas piping.2. When required by local codes, a manual shut-off valvemay have to be installed outside of the unit.3. Use wrought iron or steel pipe for all gas lines. Pipe dopeshould be applied sparingly to male threads only.4. All piping should be cleaned of dirt and scale by ham-mering on the outside of the pipe and blowing out theloose dirt and scale. Before initial start-up, be sure thatall of the gas lines external to the unit have been purgedof air.5. The gas supply should be a separate line and installed inaccordance with all safety codes as prescribed underLimitations. After the gas connections have been com-pleted, 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 dur-ing any pressure testing of that system at test pressuresin excess of 1/2 psig (3.48kPa).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 piping sys-tem at test pressures equal to or less than 1/2 psig(3.48kPa).7. A 1/8 inch NPT plugged tapping, accessible for test gageconnection, must be installed immediately upstream ofthe gas supply connection to the furnace.When connecting electrical power and control wir-ing to the unit, waterproof type connectors MUSTBE USED so that water or moisture cannot bedrawn into the unit during normal operation. Theabove waterproofing conditions will also applywhen installing a field-supplied disconnect switch.TABLE 3: CONTROL WIRE SIZES 11 Total wire length is from unit to room thermostat, andback to unit.Wire Size 22 Solid, Class II copper wire.22 20 19 18 1640 120 150 190 305Max. Wire Length3 Feet3 Total Wire length is from unit to room thermostat, andback to unit.