Drive Selection

364985-XIM-B-0508

1.Determine desired airflow.

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

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

4.Noting the RPM and BHP from step 3, locate the appropriate model and drive on the RPM selection table.

5.Review the BHP compared to the motor options available. Select the appropriate motor.

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

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

Example

1.19000 CFM

2.5.4 iwg

3.Using the supply air blower performance table below, the following data point was located: 1150 RPM & 36 BHP.

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

5.36 BHP exceeds the maximum continuous BHP rating of the 30 HP motor. The 40 HP motor is required.

6.1150 RPM is within the range of the 30 & 40 HP drives, but step 5 requires the 40 HP motor.

7.Using the 40 HP motor and drive, 5.5 turns open will achieve 1150 RPM.

Example Supply Air Blower Performance

Air							Available External Static Pressure - IWG
Flow	3.0		3.4		3.8		4.2		4.6		5.0		5.4		5.8		6.2		6.6
(CFM)	RPM	BHP	RPM	BHP	RPM	BHP	RPM	BHP	RPM	BHP	RPM BHP		RPM BHP		RPM BHP		RPM BHP		RPM BHP
			30 HP & Field		Supplied Drive					Standard 30 HP & Drive						Alternate 40 HP & Drive
18000	800	10.00	850	14.00	900	18.00	950	22.00	1000	26.00	1050	30.00	1100	34.00	1150	38.00	1200	42.00	1250	46.00
19000	850	12.00	900	16.00	950	20.00	1000	24.00	1050	28.00	1100	32.00	1150	36.00	1200	40.00	1250	44.00	1300	48.00
20000	900	14.00	950	18.00	1000	22.00	1050	26.00	1100	30.00	1150	34.00	1200	38.00	1250	42.00	1300	46.00	1350	50.00
21000	950	16.00	1000	20.00	1050	24.00	1100	28.00	1150	32.00	1200	36.00	1250	40.00	1300	44.00	1350	48.00	1400	52.00

Table X: RPM Selection

Size

Model

Max

Motor

Blower

6 Turns

5 Turns

4 Turns

3 Turns

2 Turns

1 Turn

Fully

(Tons)

BHP

Sheave

Open

Closed

34.50

1VL51

BK99

1000

1025

1045

1060

1110

1150

N/A

46.00

1VL63

BK67

1125

1175

1250

1325

1400

1475

N/A

28	Johnson Controls Unitary Products

BQ 048, BQ 036, BQ 060 specifications

Johnson Controls has established itself as a leading player in the HVAC and building management industries, and its BQ series of chillers - including the BQ 060, BQ 036, and BQ 048 - reflects this commitment to innovation and efficiency. These models are designed to provide advanced cooling solutions suitable for a variety of commercial applications.

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