York ZB Series Installation Manual

5808009-YIM-A-032036 Johnson Controls Ducted SystemsOptional electric heatThe factory-installed heaters are wired for single point powersupply. You only need to bring the power supply into the singlepoint terminal block.These CSA approved heaters are located within the centralcompartment of the unit with the heater elements extending into the supply air chamber.Fuses are supplied, where required, by the factory. Some kWsizes require fuses and others do not. See Table 13 forminimum CFM limitations.See Table 11 for electrical data.Optional gas heatThe optional gas-fired heaters have aluminized-steel or optionalstainless steel, tubular heat exchangers with spark ignition.Gas pipingProper sizing of gas piping depends on the cubic feet per hourof gas flow required, specific gravity of the gas, and the lengthof run.Follow the “National Fuel Gas Code” Z223.1 (in U.S.A.) or thecurrent Gas Installation Codes CSA-B149.1 (in Canada) in allcases unless they are superseded by local codes or gas utilityrequirements.See Table 14, Gas pipe sizing - capacity of pipe, on page 37.The heating value of the gas may vary by locality. You mustcheck the value with the local gas utility.Figure 22: Side entry gas pipingTable 13: Electric heat minimum supply airSize (tons) Model VoltageMinimum supply air (CFM)Heater kW9 18 24 36 54078(6.5) ZB208/230-3-60 1950 1950 1950 1950 -460-3-60 1950 1950 1950 1950 -600-3-60 1950 1950 1950 1950 -090(7.5) ZB208/230-3-60 2250 2250 2250 2250 -460-3-60 2250 2250 2250 2250 -600-3-60 2250 2250 2250 2250 -102(8.5) ZB208/230-3-60 2550 2550 2550 2550 -460-3-60 2550 2550 2550 2550 -600-3-60 2550 2550 2550 2550 -120(10) ZB208/230-3-60 - 3000 3000 3000 3500460-3-60 - 3000 3000 3000 3000600-3-60 - 3000 3000 3000 3500150(12.5) ZB208/230-3-60 - 3750 3750 3750 4000460-3-60 - 3750 3750 3750 3750600-3-60 - 3750 3750 3750 3750OPTIONALCOILGUARDSHOWN