Honeywell ST9141A1002 User Manual
Caution, Installation, Application
LIGHT-EMITTING DIODE (LED) INDICATIONS:
LED flashing dim-bright indicates normal operation.
LED off when control is powered indicates defective
LED on continuously when control is powered indicates
LED flashing in a cycle with LED on followed by one
or more off pulses indicates the following system
Burner limit circuit is open.
Primary limit circuit is open.
Pressure switch circuit is improp-
Control is in lockout due to air
not circulating (overheating).
WHEN INSTALLING THIS PRODUCT…
1. Read these instructions carefully. Failure to follow
them could damage the product or cause a hazardous condi-
2. Check the ratings and specifications given in the
instructions and on the product to ensure the product is
suitable for your application.
3. Installer must be a trained, experienced service
4. After installation is complete, check out the product
operation as provided in these instructions.
Disconnect power supply before wiring to pre-
vent electrical shock or equipment damage.
Location and Mounting
The ST9141A1002 is mounted in the appliance wiring
compartment using four No. 6 screws (obtained locally)
through holes on the corners of the enclosure.
All wiring must comply with local codes and ordi-
nances. Disconnect power before making wiring connec-
tions. Refer to Fig. 1 for standard wiring connections. Refer
to Fig. 2 for an internal schematic.
C.H. • 6-93 • ©Honeywell Inc. 1993 • Form Number 69-0780
ST9141A1002 Electronic Fan Timer
The ST9141A1002 Electronic Fan Timer integrates con-
trol of all combustion blower and circulating fan operations
in a gas warm air appliance. This control is the central
wiring point for most of the electrical components in the
furnace. The basic purposes of the ST9141A1002 are to
monitor the thermostat for heat, cool, and fan demands and
run the induced draft blower motor and up to a two-speed
circulating fan as required. The ST9141A1002 monitors an
spdt pressure switch, burner limit and primary limit. A
Honeywell SV9500 Hot Surface Pilot Ignition System
Control manages the burner, which is energized through
the pressure switch. A light-emitting diode (LED) indicates
In addition, this model includes electronic air cleaner
and humidifier convenience terminal connections.
NOTE: Use this control to replace an identical ST9141A1002
Electronic Fan Timer only. This control is not for use in
Voltage: 18-30 Vac, 60 Hz.
1.5A Full Load, 10A Locked Rotor at 115 Vac.
.75A Full Load, 5A Locked Rotor at 230 Vac.
Reduce full load rating by humidifier load.
Circulating Fan (Heat-Cool Speed):
15A Full Load, 30A Locked Rotor at 115 Vac.
7.5A Full Load, 15A Locked Rotor at 230 Vac.
Reduce full load rating by electronic air cleaner
Thermostat Load: 0.06A plus ignition system current
ON/OFF DELAY SETTINGS:
Delay On: 30 seconds, fixed.
Delay Off: 60, 100, 140 or 180 seconds, field
Delay On: 6 seconds, fixed.
Delay Off: 60 seconds, fixed.
Timing Tolerance: Larger of
POSTPURGE TIMING: 5 seconds.
Humidity: 5 to 95%, noncondensing.