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Environmental & Combustion Controls
Electronic Timer Boards
Circulator and inducer controls for warm air furnaces. Provides blower delay on and off timing, limit and thermostat interface, and central appliance wiring hub.
Compare Select and Compare the Product Models below.  Limited to five.  Some groupings may not be comparable.
  
ST9103
Two speed circulator for oil appliances. Isolated line voltage limit interface and isolated relay connection to oil primary.
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ST9120A,C,G
Two speed circulator plus inducer control for gas appliances. No pressure switch precheck.
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ST9120U
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Compare Select and Compare the Product Models above.  Limited to five.  Some groupings may not be comparable.
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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.A single circuit board providing combustion air blower control. Two speed circulating air blower control, limit circuit inputs, thermostat wiring terminations, and a central appliance wiring point for warm air heating appliances.
Integrates control of all burner and circulator fan operations for an oil furnaceIntegrates control of all circulating fan operations for a gas warm air appliance
Integrates control of all circulating fan operations in a two-stage gas warm air applianceIntegrates control of combustion blower and circulating fan operations for a gas warm air appliance
Trade Available. Fixed Heat Fan On Delay: 20 sec; Adjustable Heat Fan Off Delay: (90,120,150,180) Set At 120 sec; Fixed Cool Fan On and Off Delay: 0 sec
Electrical Ratings
24 Vac18 to 30 Vac
Frequency
50 Hz60 Hz
Heat Fan On Delay
adj. 30, 60 sec (set at 30 sec)adj.; set at 30 sec
fixed, 20 secfixed, 30 sec
fixed, 36 secfixed, 45 sec
fixed, 60 secfixed, 75 sec
Heat Fan Off Delay
adj. 120, 150, 180, 210 sec (set at 180 sec)adj. 150, 180, 210, 240 sec (set at 210 sec)
adj. 60, 100, 140, 180 sec (set at 140 sec)adj. 60, 100, 140, 180 sec (set at 60 sec)
adj. 60, 120, 150, 180 sec (set at 120 sec)adj. 60, 90, 120, 150 sec (set at 120 sec)
adj. 60, 90, 120, 150 sec (set at 150 sec)adj. 72, 108, 144, 180 sec (set at 144 sec)
adj. 72, 120, 168, 216 sec (set at 168 sec)adj. 90, 120, 150, 180 sec (set at 120 sec)
adj. 90, 150 sec (set at 90 sec)adj.; set at 120 sec.
adj.; set at 140 secfixed 120 sec
fixed 150 sec
Cool Fan On Delay
adj. 4, 30 sec (set at 4 sec)adj. 4-30 sec, (set at 4 sec)
fixed 0 secfixed 30 sec
fixed 4 secfixed 5 sec
fixed 6 secfixed 7 sec
Cool Fan Off Delay
adj. 30, 60 sec (set at 30 sec)fixed 0 sec
fixed 100 secfixed 30 sec
fixed 36 secfixed 60 sec
fixed 72 secfixed 90 sec
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