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S9103A ELECTRONIC FAN TIMER
69-0771B
Fig. 3. Setting delay off switches.
ST9103 Operating Sequence.
60 SEC 90 SEC
120 SEC
150 SEC
M5550
DELAY OFF SWITCH SETTINGS
ST9103A
G
W
R
Y
C
X
C
C
O
O
L
C
O
N
T
E
A
C
B
U
R
N
E
R
UNUSED
MOTOR
123
4
5
67
H
E
A
T
3
12
1
2
ON
1
2
ON
1
2
ON
1
2
ON
1
2
ON
H
U
M
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.)
• Circulating fan is energized at cool speed.
• Cooling compressor turns on immediately.
Thermostat ends call for cool.
(G and Y terminals are de-energized.)
• Circulating fan and cooling compressor turn off immediately.
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.