Honeywell ST9103A User Manual

ST9103A
Electronic Fan Timer
INSTALLATION INSTRUCTIONS
APPLICATION
The ST9103A Electronic Fan Timer integrates control of all burner and circulator fan operations in an oil furnace. This control is the central wiring point for most of the electrical components in the furnace. The basic purposes of the ST9103A are to monitor the thermostat for heat, cool, and fan demands and run the oil burner primary control and up to a two-speed circulating fan as required. The ST9103A also monitors a limit switch string, which energizes the circulating fan whenever the limit switch opens.
Electronic air cleaner and humidifier convenience terminal connections may be provided as an option. A means for operating continuous indoor air circulation is also available as an option.
SPECIFICATIONS
Electrical Ratings:
Power Requirements:
Voltage: 18-30 Vac, 50/60 Hz. Current: 4 VA at 24 Vac.
Contact Ratings:
Circulating Fan: 15A Full Load, 30A Locked Rotor at 115 Vac (includes optional EAC load).
On/Off Delay Settings:
Delay On: 30 seconds, fixed. Delay Off: 60, 90, 120, 150 seconds, field-adjustable. Timing Tolerance: larger of ±20% or 5 seconds.
2. Check the ratings and specifications given in the Instructions and on the product to assure 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.
CAUTION
Disconnect power supply before wiring to prevent electrical shock or equipment damage.
Location and Mounting
The ST9103A is mounted in the appliance wiring compartment using four No. 6 screws (obtained locally) through standoffs on the corners of the board.
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.
Setting the Heat Fan Off Delay Switches
Set the heat fan off delay switches to either 60, 90, 120, or 150 seconds, as shown in Fig. 3. The off delay time starts when the burner motor is de-energized at the end of a thermostat call for heat.
CHECKOUT
Envrionmental Ratings:
Temperature: -40 to +150° F [-40° to +66° C]. Humidity: 95% maximun, noncondensing.
INSTALLATION
When Installing this Product...
1. Read these instructions carefully. Failure to follow them could damage the product or cause a hazardous condition.
Copyright © 1997 Honeywell Inc. • All Rights Reserved
Assure the system operates properly by operating the system through at least one complete heating cycle and cooling cycle, if applicable. Troubleshoot by checking for appropriate voltages at the ST9103A terminals controlling the burner motor and heat and cool speed circulating fan. The ST9103A schematic shows internal switching to clarify operation and assist in troubleshooting. See Fig. 2.
X-XX UL
69-0771B
S9103A ELECTRONIC FAN TIMER
STARTING CAP
FUSE
INTERLOCK
L2 (N)
L1 (H)
TO 120 VAC POWER SUPPLY
LO ML MH
HI
CIRCULATING FAN
LIMIT CONTROL
THERMOSTAT
120 VAC
24 VAC
ST9103
UNUSED
3
MOTOR
B
12
U R N E R
123
C
E
O
A
N
C
T
1
4
5
H U M
67
C
H
O
E
O
A
L
T
X
C
BURNER MOTOR
GYW
R
DENOTES STANDARD TERMINAL.
1
DENOTES OPTIONAL TERMINAL.
NOTE:
DENOTES LINE VOLTAGE CONNECTIONS. DENOTES LOW VOLTAGE CONNECTIONS.
W
R
G
Y
C
1
Fig. 1. Typical ST9103A wiring connections.
L1
(WHITE)
(BLACK)
OIL PRIMARY CONTROL
L2
ORANGE
R8991
FLAME DETECTOR
CAD CELL
T1 T2
M5551
69-0771B
2
FUSE
TO 120 VAC POWER SUPPLY
S9103A ELECTRONIC FAN TIMER
INTERLOCK
ELECTRONIC AIR CLEANER
S2
K1
K1
CN6-9
K2 HEAT
COOL
K2
CONSTANT
LIMIT
CN6-1
(OPTIONAL)
1
CN6-2 CN6-4
L1
CN6-7
CN6-8
HUM
S1
S3
1
HUMIDIFIER (OPTIONAL)
ACCESSORY (OPTIONAL)
1
MED
HIGH
LOW
M1
M2
R8991 OIL PRIMARY CONTROL
BURNER MOTOR
120 VAC
MED-HIGH
1
L2
N4
CN6-5
N7
N6
CIRCULATION BLOWER
N3
N1
N2
C
ST9103A OIL ELECTRONIC FAN TIMER
T1 T2
CN6-3
DENOTES OPTIONAL CONNECTIONS, COMPONENTS AND ACCESSORIES.
1
NOTE: DOTTED LINES REPRESENT PRINTED CIRCUIT BOARD WIRING.
R8891
CN6-6
R8991 CONTROL K3
Fig. 2. ST9103A internal schematic.
24 VAC
X
R8991 LIMIT SENSOR
CIRCULATION BLOWER K1 K2
R
W
Y
G
C
THERMOSTAT
M5552
3
69-0771B
S9103A ELECTRONIC FAN TIMER
UNUSED
3
123
4
5
H E A T
H U M
67
X
C
ST9103A
ON
1
2
MOTOR
B
12
U R N E R
C
C
E
O
O
A
O
N
C
L
T
W
G
ON
1
60 SEC 90 SEC
ON
1
2
DELAY OFF SWITCH SETTINGS
Y
ON
1
120 SEC
C
ON
2
1
2
150 SEC
M5550
R
2
Fig. 3. Setting delay off switches.
ST9103 Operating Sequence.
Action System Response
Thermostat calls for heat. (W terminal is energized.)
ST9103A closes oil primary control T-T connections.
Ignition system and oil primary control start the furnace. Oil flows as long as
oil primary control senses flame.
Burner motor is energized and heat fan on delay timing begins. When timing is complete, the circulating fan is energized at heat speed and warm air is delivered to the controlled space.
Thermostat ends call for heat. (W terminal is de-energized.)
Oil primary control is de-energized, terminating the burner cycle.
Heat fan off delay timing begins. When timing is complete, the circulating
fan is de-energized.
ST9103A returns to standby mode (oil primary control and circulating fan are off).
Burner fails to light. • Oil primary control locks out within lockout timing (timing depends on oil
primary control).
Burner motor is de-energized.
If heat fan has started, it continues through the selected delay off period.
Established flame fails. Burner motor is de-energized and oil primary control goes into recycle mode.
If selected heat fan off delay is longer than the recycle delay timing, the
heat fan continues to run through the next trial for ignition.
Thermostat begins call for cool. (G and Y terminals are energized.)
Thermostat ends call for cool.
Circulating fan is energized at cool speed.
Cooling compressor turns on immediately.
Circulating fan and cooling compressor turn off immediately.
(G and Y terminals are de-energized.) Thermostat begins call for fan.
(G terminal is energized.)
Circulating fan is energized immediately at cool speed.
ST9103A maybe factory-configured to operate heat speed in this mode.
69-0771B
4
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