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TABLE 3
Thermostat Selection Switch Settings
Operation
Thermostat Switch 1 Switch 2 Switch 3
Variable Capacity Heat
(35% to 100%)
Two-Stage Off On Off
Three-Stage Heat
(35%, 70%, 100%)
Single-Stage On Off 2nd stage delay
OFF = 7 minutes
ON = 12 minutes
3rd stage delay
10 minutes fixed
Two-Stage Heat (W1 70%, W2 100%) Two-Stage Off Off Off
NOTE - When the SLP98DFV is used with an icomfort
Wi-Fi
®
communicating thermostat, all indoor blower
speed selections and DIP switch settings are made by
the communicating thermostat.
Heating Operation DIP Switch Settings -- Figure 4
Switch 1 -- Thermostat Selection -- This unit may be used
with either a single-stage or two-stage thermostat. The ther
mostat selection is made using a DIP switch which must be
properly positioned for the particular application. The DIP
switch is factory-positioned for use with a two-stage thermo
stat. If a single-stage thermostat is to be used, the DIP
switch must be repositioned. See table 3.
NOTE - All DIP switches are factory shipped in the
“OFF” position.
Switch 2 -- Operating Mode with Two-Stage Thermostat
-- If a two-stage thermostat is used, the furnace can operate
in either variable-capacity or conventional two-stage mode.
When variable-capacity mode is selected, the firing rate of
the unit is varied to maximize comfort. Conventional two-
stage mode is the factory default setting. See table 3.
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 3.
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 facto
ry with a blower-off delay of 90 seconds. 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 mo
ment that the blower is de-energized. Longer off delay set
tings provide lower supply air temperatures; shorter set
tings provide higher supply air temperatures. Table 4 pro
vides the blower off timings that will result from different
switch settings.
TABLE 4
Blower Off Delay Switch Settings
Blower Off Delay
(Seconds)
Switch 4 Switch 5
60 Off On
90 (factory) Off Off
120 On Off
180 On On
Indoor Blower Operation DIP Switch Settings
Switches 6 and 7 -- Continuous Indoor Fan Operation --
Blower Speed - Switches 6 and 7 are used to select blower
motor speeds during continuous indoor blower operation.
The unit is shipped from the factory with DIP switches posi
tioned for medium low (2) speed during continuous indoor
blower operation. The table below provides the continuous
blower speeds that will result from various switch settings.
Refer to blower tables at the front of this manual for corre
sponding cfm values.
TABLE 5
Continuous Indoor Fan
Speed
Switch 6 Switch 7
1 - Low (28%) Off On
2 - Medium Low
(38%)
(Factory)
Off Off
3 - Medium High
(70%)
On Off
4 - High (100%) On On
Switches 8 and 9 -- Cooling Mode Blower Speed --
Switches 8 and 9 are used to select cooling blower motor
speed. The unit is shipped from the factory with the DIP
switches positioned for high speed (4) indoor blower motor
operation during the cooling mode. The table below pro
vides the cooling mode blower speeds that will result from
different switch settings. Refer to blower tables at the front
of this manual for corresponding cfm values.
TABLE 6
Cooling Mode Blower Speeds
Speed
Switch 8 Switch 9
1 - Low On On
2 - Medium Low Off On
3 - Medium High On Off
4 - High (Factory) Off Off
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