Greenheck Fan 240XP-CUb Direct Drive Selection, Motor Information Belt Drive Only, Accessories

One advantage of choosing the GB-101-4-R2 over the GB-101-4-R1 is that it is capable of running at higher rpm’s, which enables the fan to move more air if necessary.

Motor pulleys are adjusted by loosening the set screw and turning the top half of the pulley (see illustrations at right). This causes the pulley diameter to change, which results in changing the fan rpm.

Belt

Opening the pulley decreases fan rpm. Closing the pulley increases fan rpm.

Direct Drive Selection

Selection of direct drive fans (those with the motor shaft connected to the fan wheel or propeller) is nearly the same as belt drive selection. However, there are two differences worth noting. Where belt drive fan speed can be altered by adjusting the motor pulley, direct drive fans (since they have no pulleys) must use a different method.

1.To adjust a direct drive fan's speed (also motor speed) or to provide a means of meeting an exact performance requirement, a speed control can be furnished. Speed controls vary the voltage supplied to the fan and slows it down; a principle similar to the way dimmer light switches work.

2.Models CUE and CW, sizes 060-095 and Model SQ, sizes 60-95, are provided with 115 volt, 60 cycle motors. The three speeds are 1550 rpm (D), 1300 rpm (G) and 1050 rpm (E). Changing a motor lead is all that is necessary to change speeds. When selecting a model with 3 speed motors, it is recommended that the G speed be chosen whenever possible. This is the middle speed, which gives the greatest flexibility in air volume because airflow can be increased or decreased simply by changing a motor lead.

Typical Motor Tag

Electrical Instructions

Suffix Letter	Motor Speed	Wiring Connections
D	1550 rpm	White to L1 Black to L2
G	1300 rpm	White to L1 Blue to L2
E	1050 rpm	White to L1 Red to L2

Motor Information (Belt Drive Only)

When specifying a belt drive fan, the model designation does not completely describe the unit. Additional information about the motor is necessary. These items are listed below:

Motor Enclosure

This will be either “Open” (open, drip proof), “TE” (totally enclosed) or “EXP” (explosion resistant). Open is the most common and will be supplied unless otherwise specified.

Speeds

Motors are available in either single speed or two speed. Single speed motors are 1725 rpm. Two speed motors will be 1725/1140 rpm. Single speed will be supplied unless otherwise specified.

Electrical Characteristics

Voltage and phase. Voltage can be 115, 208, 230 or

460.Phase is either single or 3 phase. A 115 volt, single phase motor is shown as 115/1. Typically, motors of 1/2 hp and less are single phase. Motors of 3/4 hp and greater are 3 phase.

Accessories

Most fans are ordered with accessories. Here are some common accessories for selected models:

Model

G & GB

CUBE

SB

Common Accessories	Model	Common Accessories
Roof Curb	SP & CSP	Speed Control
Backdraft Damper		Discharge Vents
Roof Curb		Backdraft Damper
Grease Trap	SQ & BSQ
		Vibration Isolators
Wall Mount Housing or
Wall Mount Collar

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