York R-410A ZH/ZJ/ZR Series manual Airflow Performance, Drive Selection, Example RPM Selection

528150-YTG-G-1210

Drive Selection

1.Determine side or bottom supply duct Application.

2.Determine desired airflow.

3.Calculate or measure the amount of external static pressure.

•Add or deduct any additional static resistance from “Additional Static Resistance Table”.

4.Using the operating point determined from steps 1, 2 & 3, locate this point on the appropriate supply air blower performance table. (Linear interpolation may be necessary.)

5.Noting the RPM and BHP from step 4, locate the appropriate motor and, or drive on the RPM selection table.

6.Review the BHP compared to the motor options available. Select the appropriate motor and, or drive.

7.Review the RPM range for the motor options available. Select the appropriate drive if multiple drives are available for the chosen motor.

8.Determine turns open to obtain the desired operation point.

Example

1.2600 CFM

2.1.6 iwg

3.Using the supply air blower performance table below, the following data point was located: 1268 RPM & 1.95 BHP.

4.Using the RPM selection table below, Size X and Model Y is found.

5.1.95 BHP exceeds the maximum continuous BHP rating of the 1.5 HP motor. The 2 HP motor is required.

6.1268 RPM is within the range of the 2 HP drives.

7.Using the 2 HP motor and drive, .5 turns open will achieve 1268 RPM.

Airflow Performance

Example Supply Air Blower Performance

Air Flow							Available External Static Pressure - IWG
	0.2		0.4		0.6		0.8		1.0		1.2		1.4		1.6		1.8		2.0
(CFM)
	RPM	BHP	RPM	BHP	RPM	BHP	RPM	BHP	RPM	BHP	RPM BHP		RPM BHP		RPM BHP		RPM BHP		RPM BHP
			1.5 HP & Field Supplied Drive							Standard 1.5 HP & Drive						Alternate 2 HP & Drive
2200	804	0.50	866	0.71	925	0.90	982	1.06	1038	1.21	1092	1.35	1147	1.48	1203	1.61	1259	1.73	1317	1.87
2400	835	0.66	897	0.87	956	1.06	1013	1.22	1069	1.37	1124	1.51	1178	1.64	1234	1.77	1290	1.90	1348	2.03
2600	869	0.84	931	1.05	990	1.24	1047	1.40	1103	1.55	1158	1.69	1212	1.82	1268	1.95	1324	2.07	1382	2.21
2800	906	1.03	968	1.25	1027	1.43	1084	1.60	1139	1.75	1194	1.89	1249	2.02	1304	2.14	1361	2.27	-	-

Example RPM Selection

Size

Model

Airflow

HP

Max

Motor

Blower

6 Turns

5 Turns

4 Turns

3 Turns

2 Turns

1 Turn

Fully

(Tons)

Option

BHP

Sheave

Sheave

Open

Open

Open

Open

Open

Open

Closed

X

Y

Std.

1.5

1.73

1VM50

AK74

N/A

897

945

991

1035

1079

1126

H. Static

2

2.30

1VM50

AK64

N/A

1039

1094

1150

1207

1256

1308

Example Additional Static Resistance

Size	Model	CFM	Cooling Only	Economizer	4” Pleated Filter			Electric Heat kW
(Tons)						3	6	9	15	20	24
		900	0.05	-0.05	0.01	0.00	0.00	0.00	0.01	0.01	0.01
		1000	0.05	-0.03	0.02	0.00	0.00	0.00	0.02	0.02	0.02
X	Y	1100	0.04	-0.02	0.03	0.01	0.01	0.01	0.02	0.02	0.02
		1200	0.04	0.00	0.04	0.01	0.01	0.01	0.02	0.02	0.02
		1300	0.03	0.01	0.05	0.01	0.01	0.01	0.03	0.03	0.03

96 Johnson Controls Unitary Products