York ZF180 Installation Manual

Also see for ZF 180 Series: Technical guide Installation manual Instruction manual Technical guide Installation manual

Contents

5168276-XIM-B-021620 Johnson Controls Unitary ProductsOptional Gas HeatThese gas-fired heaters have aluminized-steel or optionalstainless steel, tubular heat exchangers with spark ignition withproven pilot.Gas PipingProper sizing of gas piping depends on the cubic feet per hourof gas flow required, specific gravity of the gas and the length ofrun. “National Fuel Gas Code” Z223.1 (in U.S.A.) or the currentGas Installation Codes CSA-B149.1 (in Canada) should befollowed in all cases unless superseded by local codes or gasutility requirements. Refer to the Pipe Sizing Table 13. Theheating value of the gas may differ with locality. The valueshould be checked with the local gas utility.NOTE: There may be a local gas utility requirement specifyinga minimum diameter for gas piping. All units require aone-inch pipe connection at the entrance fitting.Figure 16: External Supply Connection External Shut-OffFigure 17: Bottom Supply Connection External Shut-OffNOTE: Maximum capacity of pipe in cubic feet of gas per hourbased upon a pressure drop of 0.3 inch W.C. and 0.6specific gravity gas.Gas ConnectionThe gas supply line can be routed within the space and roof curb,exiting through the unit’s basepan. Refer to Figure 5 for the gaspiping inlet location. Typical supply piping arrangements areshown in Figures 16 and 17. All pipe nipples, fittings, and the gascock are field supplied.Gas piping recommendations:1. A drip leg and a ground joint union must be installed in thegas piping.2. Where required by local codes, a manual shut-off valvemust 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.Table 11: Gas Application DataUnit Input(MBH) Output (MBH) Temp Rise(°F)Size Opt.180 N30 300 240 20-50N40 400 320 30-60240 N30 300 240 20-50N40 400 320 30-60Drip LegMainManualShut-offValveDrip LegMainManualShut-offValveTable 12: Gas Pipe Sizing - Capacity of PipeLength ofPipe ft. (m)Nominal Iron Pipe Size1 in. 1-1/4 in.10 (3) 520 (14.7) 1050 (29.7)20 (6) 350 (9.9) 730 (20.6)30 (9.1) 285 (8) 590 (16.7)40 (12.1) 245 (6.9) 500 (14.1)50 (15.2) 215 (6) 440 (12.4)60 (18.2) 195 (5.5) 400 (12.4)70 (21.3) 180 (5) 370 (10.4)80 (24.3) 170 (4.8) 350 (9.9)90 (27.4) 160 (4.5) 320 (9)100 (30.4) 150 (4.2) 305 (8.6)Table 13: Gas Heat Minimum Supply Air ImperialSize(Tons) Heat SizeSupply Air (CFM)Cooling HeatingMin Max Min Max180(15)N30 4500 7000 4500 7000N40 4500 7000 4500 7000240(20)N30 6000 9400 6000 9400N40 6000 9400 6000 9400Table 14: Gas Heat Minimum Supply Air MetricSize(Tons) Heat SizeSupply Air (M 3 /S)Cooling HeatingMin Max Min Max180(15)N30 2.13 3.3 2.13 3.3N40 2.13 3.3 2.13 3.3240(20)N30 2.83 4.44 2.83 4.44N40 2.83 4.44 2.83 4.44