Other Unit Adjustments - Lennox ELITE EL195UHE Installation Instructions Manual

Other Unit Adjustments

Primary Limit.
The primary limit is located on the heating compartment
vestibule panel. This limit is factory set and requires no ad­
justment.
Flame Rollout Switches (Two)
These manually reset switches are located in the burner
box.
Pressure Switch
The pressure switch is located in the heating compartment
on the cold end header box. This switch checks for proper
combustion air inducer operation before allowing ignition
trial. The switch is factory-set and must not be adjusted.
Temperature Rise
After the furnace has been started and supply and return
air temperatures have been allowed to stabilize, check the
temperature rise. If necessary, adjust the blower speed to
maintain the temperature rise within the range shown on
the unit nameplate. Increase the blower speed to decrease
the temperature. Decrease the blower speed to increase
the temperature rise. Failure to adjust the temperature rise
may cause erratic limit operation.
Fan Control
Fan On Delay
The heat fan on time of 30 seconds is not adjustable. The
cool fan on delay is 2 seconds and not adjustable.
Fan Off Delay
The heat fan off delay (amount of time that the blower oper­
ates after the heat demand has been satisfied) may be ad­
justed by changing the jumper position across the five pins
on the integrated control. The unit is shipped with a factory
fan off setting of 90 seconds. The fan off delay affects com­
fort and is adjustable to satisfy individual applications. Ad­
just the fan off delay to achieve a supply air temperature be­
tween 90° and 110°F at the moment that the blower is
de-energized. Longer off delay settings provide lower re­
turn air temperatures; shorter settings provide higher re­
turn air temperatures. See figure 60.
The cool fan off delay (amount of time that the blower oper­
ates after the cool demand has been satisfied) is 45 sec­
onds and not adjustable.
Blower Speeds
Follow the steps below to change the blower speeds.
1 - Turn off electrical power to furnace.
2 - Remove blower access panel.
3 - Disconnect existing speed tap at integrated control
speed terminal.
NOTE - Termination of any unused motor leads must be in­
sulated.
HEAT FAN‐OFF TIME IN SECONDS
To adjust fan-off timing, reposition jumper across pins to
60 Second
off Time
4 - Place unused blower speed tap on integrated control
"PARK" terminal or insulate.
5 - Refer to blower speed selection chart on unit wiring
diagram for desired heating or cooling speed. See
Product Specifications Bulletin for blower perfor­
mance data.
6 - Connect selected speed tap at integrated control
speed terminal.
7 - Resecure blower access panel.
8 - Turn on electrical power to furnace.
9 - Recheck temperature rise.
Electronic Ignition
The integrated control has an added feature of an internal
Watchguard control. The feature serves as an automatic
reset device for integrated control lockout caused by igni­
tion failure. This type of lockout is usually due to low gas
line pressure. After one hour of continuous thermostat de­
mand for heat, the Watchguard will break and remake ther­
mostat demand to the furnace and automatically reset the
integrated control to begin the ignition sequence.
Exhaust and Air Intake Pipe
1 - Check exhaust and air intake connections for tightness
and to make sure there is no blockage.
2 - Is pressure switch closed? Obstructed exhaust pipe
will cause unit to shut off at pressure switch. Check ter­
mination for blockages.
3 - Obstructed pipe or termination may cause rollout
switches to open. Reset manual flame rollout switches
on burner box assembly if necessary.
Page 47
NO JUMPER
achieve desired setting.
90 Second 120 Second
off Time off Time
FIGURE 60
180 Second
off Time