Printed in U.S.A.
PART NO. 37-1022B
Replaces 37-1022-A
9520
FAILURE TO READ AND FOLLOW ALL INSTRUCTIONS CAREFULLY
BEFORE INSTALLING OR OPERATING THIS CONTROL COULD CAUSE
PERSONAL INJURY AND/OR PROPERTY DAMAGE.
DESCRIPTION
Operator: Save these instructions for future use!
R
WHITE-RODGERS DIVISION
EMERSON ELECTRIC CO.
9797 REAVIS ROAD
ST. LOUIS, MISSOURI 63123-5398
INSTALLATION INSTRUCTIONS
11A79-2
Direct Immersion
Hot Water Control
WHITE-RODGERS
This control is designed for use on hot water heating
systems.
It has a coiled element that is immersed directly into the
boiler water. This feature gives an unusual speed of
response to rapid changes of water temperature thereby
preventing thermal lag.
This control has single-pole, double-throw switch action,
offering terminals that have open-on-rise switch action as
well as close-on-rise switch action. It may be used as a
high limit control, low limit control, circulator control, or as
a combination low limit and circulator control.
PRECAUTIONS
Shut off main gas to heating system until installa-
tion is complete.
Label all wires prior to disconnection when ser-
vicing controls. Wiring errors can cause improper
and dangerous operation.
Following installation or replacement, follow ap-
pliance manufacturer's recommended installa-
tion and/or service instructions to insure proper
operation.
Do not use on circuits exceeding specified volt-
age. Higher voltage will damage control and could
cause shock or fire hazard.
CAUTION
!
CAUTION
!
THIS CONTROL MUST BE INSTALLED BY A QUALI-
FIED 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.
To prevent electrical shock and/or equipment
damage, disconnect electric power to system at
main fuse or circuit breaker box until installation
is complete.
WARNING
!
INSTALLATION
When used as a circulator control, it may be located
near the boiler outlet or riser.
When used as a combination low limit and circulator
control, it should be located the same as suggested for
low limit service.
When tightening the control into the boiler, care should be
taken to apply all leverage to the hexagonal nut only to
avoid damage to the diaphragm or control mechanism.
If the boiler manufacturer recommends a control location,
follow such recommendations. If none is offered, the
following information gives suggested locations.
For high limit service, the control should be located in
the hottest part of the boiler. This is usually at the top of the
boiler. A high limit control should not be located in the
section of the boiler that contains the heat exchanger that
supplies domestic hot water.
For low limit or operating service, the control should be
located so that it responds to the temperature of the
section of the boiler that heats domestic hot water.
