TABLE 15
Non−Communicating Thermostat Selection Switch Settings
Operation | Thermostat | Switch 1 | Switch 2 | Switch 3 |
|
|
|
|
|
Variable Capacity Heat | Two−Stage | Off | On | Off |
(35% to 100%) |
|
|
|
|
|
|
|
|
|
Three−Stage Heat | Single−Stage | On | Off | 2nd stage delay |
(35%, 70%, 100%) |
|
|
| 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
Toucht communicating thermostat, all indoor blower speed selections and DIP switch settings are made by the
communicating thermostat.
SLP98DFV units are equipped with an integrated control. This control manages ignition timing, combustion air induc- er speed, heating mode fan off delays and indoor blower speeds based on selections made using the control DIP switches and on−board links. The control includes an inter- nal Watchguard feature which automatically resets the ignition control when it has been locked out.
NOTE − All DIP switches are factory shipped in the
position.
Heating Operation DIP Switch Settings −− Figure 44
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 application. The DIP switch is factory−positioned for use with a two− stage 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 Thermo-
stat −− 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. Conven- tional two−stage mode is the factory default setting. 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. The blower off delay affects comfort and is adjustable to satisfy individ- ual 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−energized. Longer off delay settings provide lower supply air temperatures; shorter set- tings provide higher supply air temperatures. Table 16 pro- vides the blower off timings that will result from different switch settings.
TABLE 16
Blower Off Delay Switch Settings
Blower Off Delay | Switch 4 | Switch 5 | |
(Seconds) | |||
|
| ||
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 −− The unit is shipped from the factory with the DIP switches positioned for medium low (2) speed dur- ing continuous indoor blower operation. The table below provides the continuous blower speeds that will result from different switch settings. Refer to tables beginning on page 37 for corresponding cfm values.
TABLE 17
Continuous Indoor Blower Operation −− Blower Speeds
Speed | Switch 6 | Switch 7 | |
1 − Low | Off | On | |
2 − Medium Low | Off | Off | |
(Factory) | |||
|
| ||
3 − Medium High | On | Off | |
4 − High | On | On |
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