York R-410A User Manual download pdf (Page 32)

528194-YTG-F-1210

32 Johnson Controls Unitary Products

Drive Selection

1. Determine side or bottom supply duct Application.

2. Determine desired airflow.

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

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

(CFM)

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

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 - -

Table X: RPM Selection

Size

(Tons)

Model HP

Max

BHP

Motor

Sheave

Blower

Sheave

6 Turns

Open

5 Turns

Open

4 Turns

Open

3 Turns

Open

2 Turns

Open

1 Turn

Open

Fully

Closed

1.5 1.73 1VM50 AK74 N/A 897 945 991 1035 1079 1126

2 2.30 1VM50 AK64 N/A 1039 1094 1150 1207 1256 1308

1 2 ... 27 28 29 30 31 32 33 34 35 36 37 ... 67 68

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York R-410A User Manual Page 32

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