Lennox SLP98DFV Installation Instructions Manual page 41

Operation
Variable Capacity Heat (35% to 100%)
Three-Stage Heat
(35%, 70%, 100%)
Two-Stage Heat (W1 70%, W2 100%)
NOTE - When the SLP98DFV is used with an icomfort
Wi- Fi® thermostat, all indoor blower speed selections
and DIP switch settings are made by the communicating
thermostat.
SLP98DFV units are equipped with an integrated con-
trol. This control manages ignition timing, combustion air
inducer speed, heating mode fan off delays and indoor
blower speeds based on selections made using the con-
trol DIP switches and on-board links. The control includes
an internal Watchguard feature which automatically resets
the ignition control when it has been locked out.
NOTE - All DIP switches are factory shipped in the "OFF"
position.
Heating Operation DIP Switch Settings -- Figure 47
Switch 1 -- Thermostat Selection -- This unit may be
used with either a single-stage or two-stage thermostat.\
The thermostat selection is made using a DIP switch
which must be properly positioned for the particular appli-
cation. The DIP switch is factory-positioned for use with a
twostage thermostat. If a single-stage thermostat is to be
used, the DIP switch must be repositioned. See table 15.
Switch 2 -- Operating Mode with Two-Stage Ther-
mostat -- If a two-stage thermostat is used, the furnace
can operate in either variable-capacity or conventional
twostage mode. When variable-capacity mode is select-
ed, the firing rate of the unit is varied to maximize comfort.
Conventional two-stage mode is the factory default set-
ting. See table 15.
Switch 3 -- Second-Stage Heat On Delay -- If a single-
stage thermostat is used, the integrated control can be
used to energize second-stage heat after either 7 minutes
or 12 minutes of first-stage heat operation. See table 15.
Switches 4 and 5 -- Blower-Off Delay -- The blower-on
delay of 45 seconds is not adjustable.The blower-off delay
(time that the blower operates after the heating demand
has been satisfied) can be adjusted by moving switches 4
and 5 on the integrated control. The unit is shipped from
the factory with a blower-off delay of 90 seconds
TABLE 15
Non-Communicating Thermostat Selection Switch Settings
Thermostat
Two-Stage
Single-Stage
Two-Stage
Switch 1 Switch 2
Off On
On On
Off Off
The blower off delay affects comfort and is adjustable
to satisfy individual applications. Adjust the blower off
delay to achieve a supply air temperature between 90°
and 110°F at the exact moment that the blower is de-en-
ergized. Longer off delay settings provide lower supply
air temperatures; shorter settings provide higher supply
air temperatures. Table 16 provides the blower off timings
that will result from different switch settings.
Blower-Off Delay Switch Settings
Blower-Off Delay
(Seconds)
60
90 (factory)
120
180
Indoor Blower Operation DIP Switch Settings
Switches 6 and 7 -- Continuous Indoor Fan Opera-
tionBlower Speed -- The unit is shipped from the factory
with the DIP switches positioned for medium low (2) speed
during continuous indoor blower operation. The table be-
low provides the continuous blower speeds that will result
from different switch settings. Refer to tables beginning on
page 37 for corresponding cfm values.
Continuous Indoor Blower Operation -- Blower Speeds
Speed
1 - Low (28%)*
2 - Medium Low (38%)*
Factory
3 - Medium High (70%)*
4 - High (100%)*
* Percentage of high speed cooling
Page 41
Switch 3
Off
2nd stage delay OFF = 7 minutes
ON = 12 minutes 3rd stage delay
10 minutes fixed
Off
TABLE 16
Switch 5
Switch 4
Off On
Off Off
On Off
On On
TABLE 17
Switch 6 Switch 6
Off
Off
On
On
On
Off
Offf
On