White Rodgers 24A5X User Manual
24A5X SERIES
WHITE-RODGERS
Fan/Heat Sequencer
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 sequencer is a direct replacement unit for sequencing both fan and heat. This sequencer has a solid-state
24 volt heater between the “H-H” terminals and a variety
of normally open contact sets. These contacts close and
open within specified timings and are used to control the
furnace fan and heating elements on demand from a
room thermostat.
THIS CONTROL MUST BE INSTALLED BY A QUALIFIED 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 components 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 WhiteRodgers warranty.
WARNING
!
Do not use on circuits exceeding specified voltages. Higher voltages will damage control and
could cause shock or fire hazard.
Some sequencers contain auxiliary contacts that are
used to energize the heater of another sequencer. This
arrangement provides a definite delay in energizing heating elements and prevents more than the required number of elements from being energized at the same time.
It also allows one room thermostat to control a large
number of elements without excessively high current
through the thermostat.
PRECAUTIONS
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.
Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper
and dangerous operation.
Following installation or replacement, follow
appliance manufacturers’ recommended installation/service instructions to insure proper operation.
If in doubt about whether your wiring is millivolt,
low or line voltage, have it inspected by a qualified heating and air conditioning contractor or a
licensed electrician.
WHITE-RODGERS DIVISION
EMERSON ELECTRIC CO.
9797 REAVIS ROAD ST. LOUIS, MO 63123-5398
(314) 577-1300 FAX (314) 577-1517
Printed in U.S.A.
PART NO. 37-3782B
Replaces 37-3782A
9715
SPECIFICATIONS
U.L. Ambient Rating:
-20° to +165°F (-29° to +74°C)
Terminals:
Dual 1/4" male quick-connect for combination
AC Electrical Ratings:
Main Switch - (Terminals designated “M”)
Maximum Load: 25A at 240 VAC
Combined Load: 22A non-inductive plus 4A
inductive at 240 VAC or 20.8A non-inductive
plus 5.2A inductive at 240 VAC
Auxiliary Switch - (Terminals designated “A”)
1.0A at 30 VAC non-inductive
Bimetal Heater - (terminals designated “H”)
Input: 24 VAC 60 Hz 0.16A
INSTALLATION
The sequencer may be mounted in any position and
location provided that the temperature does not exceed
the U.L. ambient rating.
All wiring must conform to local and national electrical codes and ordinances.
The terminal markings are equivalent to most other manufacturers' types. Follow the original equipment manufacturers' recommendations for proper wiring.
Follow the original equipment manufacturers' recommendations for the proper location.
Wiring
DEFINITIONS
MAIN CONTACTS: These are the load contacts and are
identified by the terminals designated “M”. The M1-M2
contacts will always be the first set of contacts to close
and the last set to open. The M3-M4 contacts will always
be the second set of contacts to close and the second-tolast set of contacts to open. The M5-M6 contacts will
always close last and open first.
AUXILIARY CONTACTS: These contacts are identified
by terminals designated “A”. During the ON cycle, these
contacts complete the control circuit to subsequent se-
quencers when more than one is required. These contacts will close after all main contacts have closed and will
open before any of the main contacts open.
FAN INTERLOCK: When multiple sequencers are used,
U.L. requires a fan interlock circuit which will guarantee
that the fan will stay on until all heating elements are deenergized. The fan interlock circuit must be the first set of
contacts to close and will normally be marked “M1-M2”.
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