Honeywell Fan ST9141A1002 User Manual

ST9141A1002 Electronic Fan Timer  
LIGHT-EMITTING DIODE (LED) INDICATIONS:  
Application  
LED flashing dim-bright indicates normal operation.  
LED off when control is powered indicates defective  
The ST9141A1002 Electronic Fan Timer integrates con-  
control.  
trol of all combustion blower and circulating fan operations  
LED on continuously when control is powered indicates  
in a gas warm air appliance. This control is the central  
defective control.  
wiring point for most of the electrical components in the  
LED flashing in a cycle with LED on followed by one  
furnace. The basic purposes of the ST9141A1002 are to  
or more off pulses indicates the following system  
monitor the thermostat for heat, cool, and fan demands and  
errors.  
run the induced draft blower motor and up to a two-speed  
circulating fan as required. The ST9141A1002 monitors an  
Number  
spdt pressure switch, burner limit and primary limit. A  
of Off  
Honeywell SV9500 Hot Surface Pilot Ignition System  
Flash  
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.  
Pulses  
System Condition  
1
2
3
Burner limit circuit is open.  
Primary limit circuit is open.  
Pressure switch circuit is improp-  
erly closed.  
NOTE:UsethiscontroltoreplaceanidenticalST9141A1002  
Electronic Fan Timer only. This control is not for use in  
general applications.  
4
Control is in lockout due to air  
not circulating (overheating).  
Specifications  
Installation  
ELECTRICAL RATINGS:  
Power Requirements:  
WHEN INSTALLING THIS PRODUCT…  
1. Read these instructions carefully. Failure to follow  
them could damage the product or cause a hazardous condi-  
tion.  
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.  
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:  
CAUTION  
!
Disconnect power supply before wiring to pre-  
vent electrical shock or equipment damage.  
Delay On: 30 seconds, fixed.  
Delay Off: 60, 100, 140 or 180 seconds, field  
adjustable.  
Cool Speed:  
Delay On: 6 seconds, fixed.  
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.  
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.  
Wiring  
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 Number69-0780  
 
Fig. 2—ST9141A1002 internal schematic.  
L1  
L2  
(H)  
(N)  
TO 120 VAC  
FUSE  
POWER SUPPLY  
INTERLOCK  
L1-1  
N1  
EAC (N)  
EAC (S)  
ELECTRONIC AIR CLEANER  
LOW  
M2  
CIRCULATING  
FAN  
MED-LOW  
MED-HIGH  
HIGH  
K1  
K2  
K2  
HEAT  
COOL  
N2  
M1  
HUM (S)  
HUM (N)  
HUMIDIFIER  
K3A  
COMBUSTION  
AIR BLOWER  
DI  
N3  
N4  
L1-2  
120 VAC  
TRANSFORMER  
CN1  
X
C
24 VAC  
1
X-OT  
BURNER  
LIMIT  
6
PRIMARY  
LIMIT  
ST9141A  
ELECTRONIC  
FAN TIMER  
THERMOSTAT  
C
R-OT  
PS1  
8
G
Y
3
N.C.  
N.O.  
W
R
K3B  
COM.  
7
PS2  
FT  
5
24V  
4
PRESSURE  
SWITCH  
C
COOLING  
CONTACTOR  
2
SV9500 HOT SURFACE PILOT  
IGNITION SYSTEM CONTROL  
24V  
GND  
TSTAT  
FT  
NOTE: DOTTED LINES REPRESENT PRINTED CIRCUIT BOARD WIRING.  
M5608  
3
69-0780  
 
Setting the Heat Fan Off Delay DIP Switches  
Set the heat fan off delay DIP switches to 60, 100, 140 or  
180 seconds as shown in Fig. 3. The off delay is factory-set  
at 140 seconds. This delay time starts when the main gas  
valve is de-energized at the end of a thermostat call for heat.  
Fig. 3—Setting delay off DIP switches.  
ST9141  
2
1
3
4
N
3
DI  
C
X
X
NEUTRAL  
CIR  
BLWR  
EAC  
N
1
2
HUM  
N
Checkout  
Assure the system operates properly by operating the  
system through at least one complete heating cycle and  
cooling cycle. Troubleshoot by checking for appropriate  
voltages at the ST9141A1002 terminals controlling the  
combustion air blower and heat and cool speed circulating  
fan. The ST9141A1002 schematic shows internal switch-  
ing to clarify operation and assist in troubleshooting. See  
Fig. 2.  
Z1  
Z2  
DELAY  
SPEED  
1
2
UP  
C
Y
OFF  
G
C
R
Y
W
ON  
OFF  
1
2
1
2
1
2
1
2
180 SECONDS  
60 SECONDS 100 SECONDS 140 SECONDS  
DELAY OFF DIP SWITCH SETTINGS  
M5658  
ST9141A1002 Operating Sequence  
Action  
System Response  
Thermostat calls for heat.  
(W terminal is energized.)  
Pressure switch confirmed in no airflow position. (If pressure switch shows  
airflow, LED flashes three times.)  
Combustion air blower is energized.  
Air proving switch makes (air flow is established).  
Ignition system is energized.  
Gas valve opens and main burner lights.  
Heat fan on delay timing begins. When timing is complete, circulating blower  
is energized at heat speed.  
Thermostat ends call for heat.  
(W terminal is de-energized.)  
Ignition system is de-energized and gas valve closes.  
Combustion air blower is de-energized after postpurge timing.  
Heat fan off delay timing begins. When timing is complete, the circulating fan  
is de-energized.  
Thermostat begins call for cool.  
(G and Y terminals are energized.)  
Cooling contactor is energized.  
Circulating fan is energized at cool speed after cool fan on delay timing.  
Thermostat ends call for cool.  
(G and Y terminals are de-energized.)  
Cooling contactor is de-energized.  
Circulating fan turns off after cool fan off delay timing.  
Thermostat begins call for fan.  
(G terminal is energized.)  
Circulating fan is energized at heat speed two seconds after G terminal is  
energized.  
If a call for heat occurs, circulating fan continues to run at heat speed.  
If a call for cool occurs, circulating fan switches to cool speed after four-  
second delay.  
Thermostat ends call for fan.  
(G terminal is de-energized.)  
Circulating fan is de-energized.  
Primary limit switch string opens.  
Thermostat and ignition system are de-energized and gas valve closes.  
Combustion air blower is de-energized.  
Circulating fan is energized at heat speed.  
LED flashes twice.  
If there is a call for cooling or fan, the circulating fan switches from heat speed  
to cool speed.  
(continued)  
4
 
ST9141A1002 Operating Sequence (Continued)  
Action  
System Response  
Primary limit switch string closes.  
Circulating fan turns off after the selected heat fan off delay timing.  
LED stops flashing.  
Normal operation resumes.  
Primary limit switch string is open  
for more than 150 seconds (on each  
of three consecutive cycles).  
Combustion air blower, circulating fan and ignition system are de-energized.  
Control goes into lockout mode.  
LED flashes four times.  
Control remains in lockout until 24V power is removed and reapplied (control  
is reset).  
LED stops flashing.  
Normal operation resumes.  
Burner limit opens.  
Burner limit closes.  
Thermostat and ignition system are de-energized and gas valve closes.  
Combustion air blower and circulating fan heat speed are energized.  
LED flashes once.  
Combustion air blower remains energized for postpurge timing.  
The circulating fan remains energized for the selected delay off timing.  
LED stops flashing.  
Normal operation resumes.  
Electronic air cleaner is connected.  
(Connector to 120 Vac electronic  
air cleaner.)  
Electronic air cleaner is energized when the circulating fan heat or cool speed  
is energized.  
Humidity control is connected.  
Humidifier is energized when combustion air blower is energized.  
(Connector to 120 Vac humidifier.)  
5
69-0780  
 
Home and Building Control  
Honeywell Inc.  
1985 Douglas Drive North  
Golden Valley, MN 55422  
Home and Building Control  
Honeywell Limited—Honeywell Limitée  
740 Ellesmere Road  
Helping You Control Your World  
Scarborough, Ontario  
M1P 2V9  
QUALITY IS KEY  
Printed in U.S.A.  
 

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