Integrated Control
TWO−STAGE INTEGRATED CONTROL
1/4" QUICK CONNECT TERMINALS
DIAGNOSTIC
LEDs
DIP
SWITCHES
ON−BOARD
LINKS
SENSE = 120 VAC OUTPUT TO FLAME SENSER
NEUTRALS= 120 VAC NEUTRAL
PARK = DEAD TERMINAL FOR UNUSED BLOWER LEAD
HEAT LOW = 120 VAC OUTPUT TO CIRC BLWR −− LOW HT SPEED HEAT HIGH/ COOL LOW = 120 VAC OUTPUT TO CIRC BLWR −−
HIGH HEAT AND LOW COOL SPEED
COOL HIGH = 120 VAC OUTPUT TO CIRC BLWR −− HIGH COOL SPEED
THERMOSTAT CONNECTIONS (TB1)
1= ERROR CODE RECALL H= 24V HUMIDIFIER OUTPUT
L= LENNOX SYSTEM OPERATION MONITOR
DIP SWITCH FUNCTIONS
W915
W951
DIP SWITCH(ES) | FUNCTION | |
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1 −− 2 Stage T’stat | Selects t/stat type (single or two−stage) | |
2 −− 2nd Stage Delay | Second stage ON delay (single−stage t’stat) | |
3 & 4 | −− Heat Off Delay | Heating fan OFF delay |
5 −− | Cool Off Delay | Cooling fan OFF delay |
| FIGURE 21 | ||
EL280DF units are equipped with a two−stage integrated | Switch 2 −− Second Stage Delay (Used with Single− | ||
control. This control manages ignition timing and fan off | Stage Thermostat Only) −− This switch is used to deter- | ||
delays based on selections made using the control DIP | mine the second stage on delay when a single−stage ther- | ||
switches and jumpers. The control includes an internal | |||
mostat is being used. The switch is factory−set in the OFF | |||
watchguard feature which automatically resets the ignition | |||
position, which provides a 10−minute delay before second− | |||
control when it has been locked out. After one hour of con- | |||
stage heat is initiated. If the switch is toggled to the ON | |||
tinuous thermostat demand for heat, the watchguard will | |||
| |||
break and remake thermostat demand to the furnace and | position, it will provide a 15−minute delay before second− | ||
automatically reset the control to relight the furnace. | stage heat is initiated. This switch is only activated when | ||
DIP Switch Settings | the thermostat selector jumper is positioned for SINGLE− | ||
Switch 1 −− Thermostat Selection −− This unit may be used | stage thermostat use. | ||
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with either a single−stage or two−stage thermostat. The | Switches 3 and 4 −− Heating Blower−Off Delay −− The | ||
thermostat selection is made using a DIP switch which | |||
heating blower−on delay of 45 seconds is not adjustable. | |||
must be properly positioned for the particular application. | |||
The heating blower−off delay (time that the blower operates | |||
The DIP switch is factory−positioned for use with a two− | |||
after the heating demand has been satisfied) can be ad- | |||
stage thermostat. If a single−stage thermostat is to be used, | |||
justed by moving switches 3 and 4 on the integrated con- | |||
the DIP switch must be repositioned. | |||
trol. The unit is shipped from the factory with a heating | |||
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Select | " for two−stage heating operation con- | blower−off delay of 90 seconds. The heating blower off | |
trolled by a two−stage heating thermostat (factory set- | |||
delay affects comfort and is adjustable to satisfy individual | |||
ting); |
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| applications. Adjust the blower off delay to achieve a sup- | ||
b − Select | " for two−stage heating operation con- | ||
| |||
trolled by a single−stage heating thermostat. This set- | ply air temperature between 90° and 110°F at the exact | ||
ting provides a timed delay before second−stage heat | moment that the blower is de−energized. Longer off delay | ||
is initiated. |
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