11A79-2
Direct Immersion
Hot Water Control
WHITE-RODGERS
INSTALLATION INSTRUCTIONS
Operator: Save these instructions for future use!
FAILURE TO READ AND FOLLOW ALL INSTRUCTIONS CAREFULLY
BEFORE INSTALLING OR OPERATING THIS CONTROL COULD CAUSE
PERSONAL INJURY AND/OR PROPERTY DAMAGE.
DESCRIPTION
This control is designed for use on hot water heating This control has single-pole, double-throw switch action,
systems.
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.
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.
PRECAUTIONS
THIS CONTROL MUST BE INSTALLED BY A QUALI-
FIED INSTALLER.
CAUTION
!
Shut off main gas to heating system until installa-
tion is complete.
Do not exceed the specification ratings.
All wiring must conform to local and national electrical
codes and ordinances.
Label all wires prior to disconnection when ser-
vicingcontrols.Wiringerrorscancauseimproper
and dangerous operation.
This control is a precision instrument, and should be
handled carefully. Rough handling or distorting compo-
nents could cause the control to malfunction.
Following installation or replacement, follow ap-
pliance manufacturer's recommended installa-
tion and/or service instructions to insure proper
operation.
This control has been accurately calibrated at the factory.
Any attempt to calibrate this control will void the White-
Rodgers warranty.
WARNING
Do not use on circuits exceeding specified volt-
age.Highervoltagewilldamagecontrolandcould
cause shock or fire hazard.
!
CAUTION
!
To prevent electrical shock and/or equipment
damage, disconnect electric power to system at
main fuse or circuit breaker box until installation
is complete.
INSTALLATION
If the boiler manufacturer recommends a control location, When used as a circulator control, it may be located
follow such recommendations. If none is offered, the near the boiler outlet or riser.
following information gives suggested locations.
When used as a combination low limit and circulator
For high limit service, the control should be located in control, it should be located the same as suggested for
thehottestpartoftheboiler.Thisisusuallyatthetopofthe low limit service.
boiler. A high limit control should not be located in the
When tightening the control into the boiler, care should be
section of the boiler that contains the heat exchanger that
taken to apply all leverage to the hexagonal nut only to
supplies domestic hot water.
avoid damage to the diaphragm or control mechanism.
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.
WHITE-RODGERS DIVISION
EMERSON ELECTRIC CO.
9797 REAVIS ROAD
PART NO. 37-1022B
Replaces 37-1022-A
9520
Printed in U.S.A.
ST. LOUIS, MISSOURI 63123-5398
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