Installation Sheet

To prevent electrical shock and/or equipment
damage, disconnect electric power to system at
main fuse or circuit breaker box until installation
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
appliance manufacturers’ recommended instal-
lation/service instructions to insure proper op-
eration.
Printed in U.S.A.
PART NO. 37-4799D
Replaces 37-4799C
9713
FAILURE TO READ AND FOLLOW ALL INSTRUCTIONS CAREFULLY
BEFORE INSTALLING OR OPERATING THIS CONTROL COULD CAUSE
PERSONAL INJURY AND/OR PROPERTY DAMAGE.
DESCRIPTION
WHITE-RODGERS DIVISION
EMERSON ELECTRIC CO.
9797 REAVIS ROAD ST. LOUIS, MO 63123-5398
[phone] FAX [phone]
WHITE-RODGERS
24A34 SERIES
except 24A34-15
Fan/Heat Sequencer
INSTALLATION INSTRUCTIONS
This sequencer is a direct replacement unit for sequenc-
ing both fan and heat. It can be used in a broad range of
gas and electric heating equipment and many other
applications where time delay is required.
This sequencer has a solid-state 24 volt heater, used to
energize the control, and a variety of normally open
contact sets. These contacts close and open within speci-
fied timings and are used to control the furnace fan and
heating elements on demand from a room thermostat.
Operator: Save these instructions for future use!
PRECAUTIONS
THIS CONTROL MUST BE INSTALLED BY A QUALI-
FIED INSTALLER.
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 re-calibrate this control will void the White-
Rodgers warranty.
Do not use on circuits exceeding specified volt-
ages. Higher voltages will damage control and
could cause shock or fire hazard.
If in doubt about whether your wiring is millivolt,
low or line voltage, have it inspected by a quali-
fied heating and air conditioning contractor or a
licensed electrician.
CAUTION
!
WARNING
!
This sequencer meets a wide variety of timing require-
ments and assures long life at high electrical loads as well
as minimum radio and TV interference.
Each sequencer is stamped with timing specifications.
For example, H1-20 C40-110 means the ON time for
heating is 1 to 20 seconds and the OFF time for cooling is
40 to 110 seconds. First contacts turn ON first and turn
OFF last; others are random On and random OFF.