PRINCIPLE OF OPERATION

When the temperature in the controlled area rises, the fluid in the coiled bulb expands, causing the contacts in the switch mechanism to snap closed, turning on the ventilating fan to high speed.

As the area cools, the fluid contracts. When the tempera- ture reaches the control setting, the contacts snap open, fan reduces to slow speed. When area cools to low setting contacts open stopping the fan.

INSTALLATION

The control may be mounted in any location provided that the temperature and humidity of the air in which it is located will not cause a condensation on the switch parts.

If the ventilating equipment manufacturer has made pro- visions for, or recommendations for location of this con- trol, then follow those instructions. If not, the following suggestions should be observed:

1.The control should be mounted approximately six feet from the floor, as near as possible to the centre of the ventilated area.

2.Do not locate control on or near an outside wall.

3.Wherever possible, mount on a partitioning wall or on a post.

4.Keep the control as far as possible from undesirable sources of heat and cold, such as:

a.Windows or doors

b.Direct rays from sun

c.Steam hot water or cold water pipe

d.Adjoining outside walls.

5.Mount control in vertical position with coils facing downward.

CAUTION

Do not twist or uncoil the coiled bulb on the bottom of the control case. Do not attach conduit through coiled element to bottom of control. In- stead, run conduit to top of control.

WIRING

All wiring should be done in accordance with local and national electrical codes and ordinances.

HOT

LINE

N

LEFT SWITCH

RIGHT SWITCH

RED

BLUE

WHITE

 

HIGH

 

SPEED

 

COMMON

 

LOW

 

SPEED

 

2-SPEED MOTOR

 

SETTING THE CONTROL

STEP ONE: Set Low Speed Selector at the tempera-

STEP TWO: Set High Speed Selector at the tempera-

ture you want the Left Switch Fan to run on

ture you want the Right Switch Fan to run

low Speed. At approximately 3°F (1.7°C)

on High Speed.

with differential adjusted to minimum posi-

 

tion below this setting Fan will stop.

 

Low Speed Selector must be set at least

 

5°F (2.7°C) below setting of High Speed

 

Selector.

 

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White Rodgers 259-6 installation instructions Principle of Operation, Installation, Wiring, Setting the Control

259-6 specifications

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