York DY 048, DY 060 warranty Static Resistances, Electric Heat CFM Limitations

343615-YTG-B-0308

TABLE 21: STATIC RESISTANCES

							RESISTANCE, IWG
DESCRIPTION								CFM
			1000	1200	1400	1600	1800	2000	2200	2400	2600	2800	3000
ECONOMIZER1,3			0.07	0.08	0.09	0.11	0.13	0.15	0.17	0.20	0.23	0.26	0.30
ELECTRIC		7-15KW	0.04	0.05	0.06	0.07	0.08	0.10	0.12	0.14	0.16	0.19	0.22
HEATERS1		20-30KW	0.06	0.07	0.08	0.09	0.11	0.13	0.15	0.17	0.20	0.23	0.26
COOLING ONLY	2		0.08	0.10	0.12	0.14	0.16	0.18	0.20	0.23	0.26	0.29	0.32

1.Deduct these resistance values from the available external static pressure shown in SUPPLY AIR BLOWER PERFORMANCE Tables.

2.Add these resistance values to the available static resistance values on SUPPLY AIR BLOWER PERFORMANCE Tables.

3.The pressure through the economizer is greater for 100% outdoor air than for 100% return air. If the resistance of the return air duct system is less than 0.25 IWG, the unit will deliver less CFM during full economizer operation.

TABLE 22: ELECTRIC HEAT CFM LIMITATIONS

Size				Minimum Supply Air (CFM)
	Voltage				Heater kW
(Tons)
		5	7		10	15	20	30
	208/230-1-60	900	900		900	900	900	-
3	208/230-3-60	900	900		900	900	900	-
	460-3-60	-	900		900	900	900	-
	600-3-60	-	-		900	900	900	-
	208/230-1-60	1200	1200		1200	1200	1200	-
4	208/230-3-60	1200	1200		1200	1200	1200	-
	460-3-60	-	1200		1200	1200	1200	-
	600-3-60	-	-		1200	1200	1200	-
	208/230-1-60	1500	1500		1500	1500	1500	1500
5	208/230-3-60	1500	1500		1500	1500	1500	1500
	460-3-60	-	1500		1500	1500	1500	1500
	600-3-60	-	-		1500	1500	1500	1500

Johnson Controls Unitary Products 19