White Rodgers 1629 User Manual

WHITE-ROOOERS

ST. LOUIS J'J. MO. MARKHAM, ONTARIO

<+ O M P A N V

This Hydraulic-Action temperature control with selective range has been designed to cover a relative

ly large range, but has provisions on the outside of

the control to select a certain portion of the total

range of the control for quick, convenient adjust^

ment.

For example, if the control range is 20° to 75°, it is possible to select a smaller range (for instance 32° to 42°) and conveniently adjust to any temperature of that selected range from the external knob.

Type 1629 has a close-on-rise switch action which makes it readily applicable for all types of commer cial or industrial refrigeration applications.

■PRINCIPLE OF OPERATION-

- INSTRUCTIONS -

TYPE 1629

REFRIGERATION

TEMPERATURE CONTROL

Selective Range

As the temperature rises within the controlled area,

the fluid in the bulb expands, forcing the contacts in the switch mechanism to snap closed, turning on the refrigeration system.

As the temperature in the controlled area lowers, this fluid contracts. The contacts snap open when the temperature reaches the control setting, thereb, stopping the refrigeration system.

INSTALLATION

The control may be mounted at any convenient loca- The bulb or sensitive element should be located so tion where the temperature and humidity will not as to be in an average temperature of the controlled

cause a condensation on the contacts. area. Excess capillary should be coiled conveniently

close to the switch mechanism.

WIRING

All wiring should be done according to local and national electrical codes.

if the manufacturer of the cooling equipment has

supplied a wiring diagram, follow such recommenda

tions. If none is offered, this diagram shows the

general use of this control.

TEMPERATURE

CONTROL

file index

1600-90

Printed in U. 5. A.

PART No. 37-nn

Replaces 37-0528-2

SELECTING A RANGE-

These controls are provided with an internal dial, covering the entire range of the control. The cover has another dial graduated from 1 to 5. The selector knob and this graduated dial are used to select a part of the total range of the control.

Number 5 on the cover dial represents the lowest temperature, number 1 represents the highest tem perature. The selected portion of the internal dial is visible from the outside of the control.

■ADJUSTING-

B'TlXED INDICATOR

CCUT-OUT POINT)

C'DIFFEHENTIAL ADJUSTING SCREW

'□"MOVABLE INDICATOR

CCUT-IN POINT)

DIAL SCREWS

To select a range, proceed as follows:

1. Remove the selector knob by loosening the small set screw in the end of the knob.

2. Turn the adjusting shaft so that the minimum desired temperature of the selected range is directly under the cover indicator. For example,

if 32° is the minimum desired temperature, turn

the shaft to set the dial as shown here.

3. Without moving the adjusting shaft, replace the

selector knob, pointing it to number 5 on the cover dial.

4. Tighten selector knob in this position.

These controls have an adjustable differential. The movable indicator points to the temperature at which the compressor starts. The fixed indicator points to the temperature at which the compressor will stop. The difference between these two indicators is the differential.

To set the control, proceed as follows;

1. Remove the selective knob and take the cover off the control. This exposes the internal dial.

Turn the dial so that the fixed indicator ”B''

points to the temperature at which the com pressor is to stop.

Turn the differential adjusting screw "C" until

the movable indicator "D" points to the temper

ature at which the compressor is to start.