Install Instructions

WHITE-RODGERS DIVISION
EMERSON ELECTRIC CO.
9797 REAVIS RD., ST. LOUIS, MO. 63123
[phone], FAX [phone]
9999 HWY. 48, MARKHAM, ONT. L3P 3J3
[phone], FAX [phone]
Printed in U.S.A.
PART NO. 37-1121B
Replaces 37-1121, 37-9088 & 37-9193
9545
INSTALLATION INSTRUCTIONS
TYPE 201
REFRIGERATION
TEMPERATURE CONTROL
Adjustable Differential
FAILURE TO READ AND FOLLOW ALL INSTRUCTIONS CAREFULLY
BEFORE INSTALLING OR OPERATING THIS CONTROL COULD CAUSE
PERSONAL INJURY AND/OR PROPERTY DAMAGE.
DESCRIPTION
This Hydraulic-Action temperature control is readily ap-
plicable for many types of commercial or industrial refrig-
eration applications.
The speed of response of the temperature sensitive
element makes it particularly applicable to display cases,
unit coolers, walk-in boxes, etc., where there is no exces-
sive humidity.
Observe the following general rules when selecting a
control location:
1. The switch mechanism of this control may be mounted
in any location, provided that the temperature and
humidity of the air in which it is located do not cause
condensation on the switch parts.
2. It should be located so as to be in an average
temperature of the controlled area.
3. Never locate control on or near an outside wall.
4. Don’t locate it close to a false source of heat or cold
such as strong light, sunlight, hot or cold water pipes
in wall, etc.
INSTALLATION
When the temperature in the controlled area rises, the
fluid in the coiled element expands, causing the contacts
in the switch mechanism to snap closed, turning on the
refrigeration system.
As the refrigeration system cools the controlled area, the
fluid in the coiled element contracts. When the tempera-
ture reaches the control setting, the contacts snap open,
turning off the system.
PRINCIPLE OF OPERATION
To prevent electrical shock and/or equipment
damage, disconnect electric power to system at
main fuse or circuit breaker box until installation
is complete.
Do not use on circuits exceeding specified volt-
ages. Higher voltages will damage control and
could cause shock or fire hazard.
CAUTION
WARNING
THESE CONTROLS MUST BE INSTALLED BY A
QUALIFIED INSTALLER.
Do not exceed the specification ratings.
All wiring must conform to local and national electrical
codes and ordinances.
This control is a precision instrument, and should be
handled carefully. Rough handling or distorting compo-
nents could cause the control to malfunction.
This control has been accurately calibrated at the factory.
Any attempt to calibrate this control will void the White-
Rodgers warranty.
PRECAUTIONS
WHITE-RODGERS
Operator: Save these instructions for future use!