Specifications

Electronic Fan Timers
70-6910 149
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ST9103 Electronic Fan Timers
ST9103A integrates control of burner and circulating fan
operations in an oil furnace.
• Central appliance wiring point simplifies appliance assembly and
service.
• Fixed or field-adjustable heat fan on delay; field adjustable heat fan
off delay.
Application: A single circuit board providing combustion air blower
control, two speed circulating air blower control, oil primary control,
limit circuit inputs, thermostat wiring terminations, & a central
appliance wiring point for an oil fixed furnace.
Electrical Ratings: 18 to 30 Vac
Frequency: 60 Hz; 50 Hz
Approvals:
Canadian Standards Association: Certified: File No. LR95329-17
Underwriters Laboratories, Inc. Listed: Report MP466
ST9120 Electronic Fan Timers
The ST9120U Universal Electronic Fan Timers integrate 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 ST9120U are to monitor the thermostat for heat, cool and fan
demands, run the induced draft blower motor and run a circulating
fan (up to two speeds) as required. The ST9120U also monitors
limit switch strings and energizes separate ignition control
systems through pressure switches. The ST9120U can replace any
ST9101, ST9120, ST9141 or ST9160 listed in Table 3 below. The
ST9120U features a field-adjustable heat fan-on delay, a field-
adjustable heat fan-off delay, a field adjustable cool fan-on delay
and a field-adjustable cool fan-off delay.
Electronic air cleaner (EAC) and humidifier (HUM) convenience
terminal connections and continuous low speed indoor air
circulation are provided.
Application: Integrates control of combustion blower and circulating
fan operations for a gas warm air appliance
Electrical Ratings: 18 to 30 Vac
Frequency: 60 Hz; 50 Hz
Approvals:
Canadian Standards Association: Certified: File No. LR95329-17
Underwriters Laboratories, Inc. Listed: Report MP466
Product Number
Heat Fan
On Delay Heat Fan Off Delay
Cool Fan
On Delay
Cool Fan
Off Delay
Ambient Temperature Range
Replaces(F) (C)
ST9103A1002 fixed, 45 sec adj. 60, 90, 120, 150 sec (set at 150 sec) fixed 0 sec fixed 0 sec -40 F to +150 F -40 C to +66 C ST9103A1002
Product Number
Heat Fan On
Delay Heat Fan Off Delay
Cool Fan On
Delay
Cool Fan Off
Delay
Ambient Temperature
Range
Replaces(F) (C)
* ST9120U1011 adj. 30, 60 sec
(set at 30 sec)
adj. 60, 120, 150, 180
sec (set at 120 sec)
adj. 4, 30 sec
(set at 4 sec)
adj. 30, 60 sec
(set at 30 sec)
-40 F to
+175 F
-40 C to
+79 C
all ST9101's, all ST9120's, all
ST9141's, and all ST9160's
* TRADELINE models • SUPER TRADELINE models