Honeywell ST9141A1002 User Manual
ST9141A1002 Electronic Fan T imer
Application
The ST9141A1002 Electronic Fan Timer integrates control 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
system status.
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
general applications.
Specifications
ELECTRICAL RATINGS:
Power Requirements:
Voltage: 18-30 Vac, 60 Hz.
Contact Ratings:
Combustion Blower:
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
load.
Thermostat Load: 0.06A plus ignition system current
draw.
ON/OFF DELAY SETTINGS:
Heat Speed:
Delay On: 30 seconds, fixed.
Delay Off: 60, 100, 140 or 180 seconds, field
adjustable.
Cool Speed:
Delay On: 6 seconds, fixed.
Delay Off: 60 seconds, fixed.
Timing Tolerance: Larger of ±5% or ±2 seconds.
POSTPURGE TIMING: 5 seconds.
ENVIRONMENTAL RATINGS
Temperature: -40° to +175° F [-40° to +79° C].
Humidity: 5 to 95%, noncondensing.
LIGHT-EMITTING DIODE (LED) INDICATIONS:
LED flashing dim-bright indicates normal operation.
LED off when control is powered indicates defective
control.
LED on continuously when control is powered indicates
defective control.
LED flashing in a cycle with LED on followed by one
or more off pulses indicates the following system
errors.
Number
of Off
Flash
Pulses System Condition
1 Burner limit circuit is open.
2 Primary limit circuit is open.
3 Pressure switch circuit is improp-
4 Control is in lockout due to air
erly closed.
not circulating (overheating).
Installation
WHEN INSTALLING THIS PRODUCT…
1. Read these instructions carefully. Failure to follow
them could damage the product or cause a hazardous condition.
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
technician.
4. After installation is complete, check out the product
operation as provided in these instructions.
CA UTION
!
Disconnect power supply before wiring to prevent 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.
Wiring
All wiring must comply with local codes and ordinances. Disconnect power before making wiring connections. Refer to Fig. 1 for standard wiring connections. Refer
to Fig. 2 for an internal schematic.
1 69-0780
C.H. • 6-93 • ©Honeywell Inc. 1993 • Form Number 69-0780
Fig. 1—Typical ST9141A1002 wiring connections.
HUMIDIFIER
AIR CLEANER
COMBUSTION
BLOWER
STARTING
CAP
LO
ML
MH
HI
CIRCULATING
FAN
THERMOSTAT
NOTE:
3 DI
HUM N
12
Z1
Z2
DELAY
1
GRW
Y
2
OFF
= DENOTES STANDARD TERMINAL.
= DENOTES TERMINAL NOT PROVIDED.
DENOTES LINE VOLTAGE CONNECTIONS.
DENOTES LOW VOLTAGE CONNECTIONS.
UNUSED
EAC N
SPEED
UP
MOTOR
CY
N
LEADS
123
ST9141
NEUTRAL
CIR
C
CONT
COOL
G
4
BLWR
HEAT
FUSE
Y
XFMR
CX
W
120 VAC
TRANSFORMER
24 VAC
SEC
X
R
L1 (H)
TO 120 VAC
POWER SUPPLY
L2 (N)
PRIMARY
LIMIT
COOLING
CONTACTOR
N.C.
BURNER
LIMIT
PRESSURE
SWITCH
SV9500
HOT SURFACE
PILOT IGNITION
SYSTEM CONTROL
N.O.
24 VOLT
COMMON
24 VOLT
THERMOSTAT
OR PRESSURE
SWITCH
24 VOLT
HOT
EFT
OUTPUT
M5607
2
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