User Guide

ManualsBrandsGrundfos ManualsCirculator PumpsUPS32-80/2F 3-Speed Cast Iron Circulator Pump 208-230, 1/2 HP

4.2 Check the direction of shaft rotation

Applies to 460 V and 575 V two-speed models

only

(The direction of rotation of three-speed pumps is

checked by means of the fault finding chart, pages

11 and 12).

1. Make sure that the power is OFF.

2. Unscrew and remove the vent plug located at the

center of the nameplate.

3. Insert a small, flat-blade screwdriver into the slot

in the end of the motor shaft (see fig. 12). Rotate

the shaft with the screwdriver to make sure it

does so freely.

4. Bump the pump and watch to see which direction

the shaft rotates. The shaft must rotate in the

counterclockwise direction as shown on the

nameplate (see fig. 11).

5. If the pump shaft is rotating incorrectly, discon-

nect the power and interchange any two power

leads in the terminal box.

6. Check once again for proper counterclockwise

rotation. When it is rotating correctly, replace the

vent plug.

Fig. 11 Vent plug and direction of rotation

Fig. 12 Removing the vent plug

4.3 Speed selection

4.3.1 Three-speed pumps, all models except

3 x 460 V and 575 V

The speed switch in the terminal box can be turned

to three positions. The speed in the three positions

appears in the table below (also see fig. 13).

Changing to lower speeds offers considerable reduc-

tion in energy consumption and less noise in the sys-

tem.

Fig. 13 Pump performance at speed settings

Change the pump performance as follows:

1. Switch off the electrical supply to the pump at the

main circuit breaker. The green indicator light in

the terminal box must be off.

2. Remove the terminal box cover by loosening the

four screws in the cover.

3. Pull out the speed switch module and re-insert it

so that the desired speed is visible through the

window in the terminal box (see fig. 14).

Fig. 14 Speed switch module

TM03 7750 4806TM03 7277 4706

Vent plug Direction of

rotation

Inspection screw

Inspection screw/

vent plug

Switch

position

Speed in % of maximum speed

Single-phase

pumps

Three-phase

pumps

1 approx. 60% approx. 70%

2 approx. 80% approx. 85%

3 100% 100%

TM03 7736 4806

WARNING!

Never make any connections in the pump

terminal box unless the electrical supply

has been switched off.

TM03 7735 4806

H = head and Q = flow

SPEED