York 251934-YTG-J-0910 manual Altitude/Temperature Correction Factors

251934-YTG-J-0910

Altitude/Temperature Correction Factors

Air						Altitude (Ft.)
Temp.	0	1000	2000	3000	4000		5000	6000	7000	8000	9000	10000
40	1.060	1.022	0.986	0.950	0.916		0.882	0.849	0.818	0.788	0.758	0.729
50	1.039	1.002	0.966	0.931	0.898		0.864	0.832	0.802	0.772	0.743	0.715
60	1.019	0.982	0.948	0.913	0.880		0.848	0.816	0.787	0.757	0.729	0.701
70	1.000	0.964	0.930	0.896	0.864		0.832	0.801	0.772	0.743	0.715	0.688
80	0.982	0.947	0.913	0.880	0.848		0.817	0.787	0.758	0.730	0.702	0.676
90	0.964	0.929	0.897	0.864	0.833		0.802	0.772	0.744	0.716	0.689	0.663
100	0.946	0.912	0.880	0.848	0.817		0.787	0.758	0.730	0.703	0.676	0.651

	1.100
	1.050
	1.000
Factor	0.950						Sea Level
	0.900						1000 ft
							2000 ft
Correction
	0.850						3000 ft
							4000 ft
	0.800						5000 ft
	0.750						6000 ft
							7000 ft
	0.700						8000 ft
							9000 ft
	0.650						10000 ft
	0.600
	40	50	60	70	80	90	100
			Air Temperature (ºF)

Gas Heat Minimum Supply Air

Size					Supply Air (CFM)
		Heat Size		Cooling			Heating
(Tons)
			Min		Max	Min		Max
180	24		4500		7000	4500		7000
(15)	32		4500		7000	4500		7000
210	24		6000		8750	6000		8750
(17.5)	32		6000		8750	6000		8750
240	24		6000		9400	6000		9400
(20)	32		6000		9400	6000		9400
300	24		7500		12500	7500		12500
(25)	32		7500		12500	7500		12500

For units with VFD and gas heat, the speed of the indoor blower motor continues to be controlled by duct static pressure via the VAV control board.

If there are VAV boxes present in the duct system, the boxes must be driven to the full-open position using a customer-supplied power source to assure adequate airflow across electric heating elements or gas heat exchanger tubes.

Johnson Controls Unitary Products 67