York BQ 060, BQ 036, BQ 048 warranty Static Resistances, Electric Heater CFM Limitations

036-21508-005-A-0305

TABLE 12: STATIC RESISTANCES

						RESISTANCE, IWG
DESCRIPTION
							CFM
		1000	1200	1400	1600		1800	2000	2200	2400	2600
ECONOMIZER1, 2		0.07	0.08	0.09	0.11		0.13	0.15	0.17	0.20	0.23
ELECTRIC	5-15KW	0.04	0.05	0.06	0.07		0.08	0.10	0.12	0.14	0.16
HEATERS1
	20-30KW	0.06	0.07	0.08	0.09		0.11	0.13	0.15	0.17	0.20
BOTTOM DUCT CONNECTIONS1		0.06	0.07	0.08	0.09		0.10	0.11	0.12	0.14	0.16

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

2.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 13: ELECTRIC HEATER CFM LIMITATIONS

UNIT MODEL SIZE NOMINAL				MINIMUM SUPPLY AIR CFM
	VOLTAGE
				HEATER SIZE NOMINAL KW
TONS
		5	7	10	15	20	30
	208/230-1-60	1100	1100	1200	1200	1300	-
3	208/230-3-60	1100	1100	1200	1200	1300	-
	460-3-60	-	1100	1200	1200	1300	-
	575-3-60	-	-	1200	1200	1300	-
	208/230-1-60	1300	1300	1300	1300	1300	-
4	208/230-3-60	1300	1300	1300	1300	1300	-
	460-3-60	-	1300	1300	1300	1300	-
	575-3-60	-	-	1300	1300	1400	-
	208/230-1-60	1600	1600	1600	1600	1600	1600
5	208/230-3-60	1600	1600	1600	1600	1600	1600
	460-3-60	-	1600	1600	1600	1600	1600
	575-3-60	-	-	1600	1600	1600	1800

24 Unitary Products Group