st9120 fan timer training module
TRANSCRIPT
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ST9120U1003Universal ElectronicFan Timer
Training Module
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Product Overview Set Up Installation Troubleshooting Product Cross Reference ST9120 Advantage
ST9120U - What You Will Learn:
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What is the ST9120U Electronic Fan Timer?
A universal electronic fan timer thatintegrates control of all combustionblower and circulating fan operationsin a gas warm air appliance
- Monitors the thermostat for heat, cooland fan demands.
- Runs the induced draft blower motorand runs the circulating fan (up to twospeeds) as needed.
- Monitors limit switch strings andenergizes ignition control.
- Central wiring point for the electricalcomponents of the furnace. Saves time! One part number:
ST9120U1003
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ST9120U Electronic Fan Timer Features
Why choose the Honeywell ST9120U?
Universal application Replaces over 25 existing Honeywell controls
Easy installation DIP switch selectable circulating fan delays
Heat on/off delay Cool on/off delay (cool off fixed at 30 seconds)
Single model services multiple furnaceapplicationsIncluded with the ST9120U:
Wiring information and adapter for the ST9101 Original appliance application Delay timing recommendation
Quality construction for a long service life
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Installation
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Installation of the ST9120U
Location and Mounting
- Mount the ST9120U Electronic Fan Timer in the appliance wiringcompartment or furnace vestibule- Mounting screws provided
Wiring- Make sure that all wiring complies with local codes and
ordinances.- Disconnect power before making wiring connections.
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Set-Up
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Set up of the ST9120U
Setting DIP switches
- Heat fan-on delayOn: 30/60 SecondsStarts timing when main valve energized
- Heat fan-off delayOff: 60/100/140/180 Seconds
Starts timing when main valve is de- energized- Cool fan-on delay
On: 4/30 Seconds Starts with call for cooling
- Cool fan-off delay fixed at 30 seconds
- Post Purge: 5 seconds
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Set up of the ST9120U
Recommendeddip switchsettings areincluded in theinstallationinstructions aswell as theHoneywellResidentialCombustion
Application andSelectionGuide.
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Troubleshooting
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Troubleshooting of the ST9120U
Look for appropriate voltages at the ST9120Uterminals
Check operation and timing of:- Combustion blower- Fan at heating speed
- Fan at cooling speed Check limit operation and system response
Note: The ST9120U schematics show internal switching to clarify operationand assist in troubleshooting.
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Product Cross Reference
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Product Cross Reference
The ST9120U replaces over 25 existing Honeywell controls:
ST9101A1006 ST9120C1020 ST9120C4016 ST9120G2016
ST9101A1014 ST9120C2002 ST9120C4040 ST9120G2024
ST9101A1022 ST9120C2010 ST9120C4057 ST9120G2032
ST9120A1006 ST9120C2028 ST9120C5005 ST9120G4004
ST9120A2004
ST9120C3000
ST9120C5013
ST9120G4012
ST9120B1005 ST9120C3018 ST9120D3009 ST9120G4038
ST9120C1012 ST9120C4008 ST9120G2008
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Product Cross Reference
Where do I find Honeywell universal fan timer cross
reference information?- www.customer.honeywell.com- Honeywell Application Selection and Cross
Reference Guide Form 63-9575
- Honeywell Laminated Truck Visor Form 63-9581- Honeywell Residential Technical Support: 1-800-468-1502
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www.customer.honeywell.com
See Cross Reference Search box in right column.
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ST9120U Advantage
When promoting the ST9120U keep theseadvantages in mind:
- The ST9120U universal control replaces over 25 existingHoneywell controls. This in turn, reduces inventory andsaves time looking for the right part.
- A central wiring point for most of the electrical componentsof the furnace makes installation easy and gets the installeron to the next job faster .
- Easy to set selectable heat and cool on/off settings adapt tothe application.
- The ST9120U makes the choice simple ; one control savestime and money, improving your bottom line .
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ST9120U1003Universal Electronic Fan Timer
Knowledge Test
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Now that you completed this training module, take the
short quiz to test your knowledge.
ST9120U Knowledge Test
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Test
1. The ST9120U Universal Electronic Fan Timer
controls the blower and circulating fan in gaswarm air appliances? T or F2. The ST9120U is a central wiring point for most of
the electrical components in the furnace? T or F3. The ST9120U replaces over 25 Honeywell and
competitor controls? T or F4. The universal electronic fan timer monitors the
thermostat for heat, cool and fan demands? T or F5. The heat and cool on/off delays are set through
dip switches? T or F6. Honeywell only has one resource for crossreference information? T or F
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Answer Key
1. T
2. T3. F4. T5. T
6. F