1 − The power supply wiring must meet Class I restric- tions. Protected by either a fuse or circuit breaker, se- lect circuit protection and wire size according to unit nameplate.
NOTE − Unit nameplate states maximum current draw. See table for maximum over−current protection.
TABLE 11
SLP98DF Model | Maximum Over−Current | |
Protection (Amps) | ||
| ||
|
| |
07036B, 09036C, 09048C | 15 | |
|
| |
09060C, 11060C | 20 | |
|
|
2 − Holes are on both sides of the furnace cabinet to facili- tate wiring.
3 − Install a separate (properly sized) disconnect switch near the furnace so that power can be turned off for servicing.
4 − Before connecting the thermostat or the power wiring, check to make sure the wires will be long enough for servicing at a later date. Remove the blower access panel to check the length of the wire.
5 − Complete the wiring connections to the equipment. Use the provided unit wiring diagram and the field wir- ing diagram shown in figure 40 and table 14. Use 18−gauge wire or larger that is suitable for Class II ra- ting for thermostat connections.
NOTE − Do NOT make a wire connection between the room thermostat L terminal and the L terminal of the SLP98DFV integrated control unless this is a communicating thermostat installation with a non− communicating outdoor unit.
6 − Electrically ground the unit according to local codes or, in the absence of local codes, according to the current National Electric Code (ANSI/NFPA No. 70) for the USA and current Canadian Electric Code part 1 (CSA standard C22.1) for Canada. A green ground wire is provided in the field make−up box.
7 − One line voltage 1/4" spade terminal is provided on the furnace integrated control. Any electronic air cleaner rated up to one amp can be connected to this terminal with the neutral leg of the circuit being con- nected to one of the provided neutral terminals. See figure 44 for location of terminal. This terminal is ener- gized when the indoor blower is operating.
8 − One line voltage ade terminal is provided
on the furnace integrated control. Any humidifier rated up to one amp can be connected to this terminal with the neutral leg of the circuit being connected to one of the provided neutral terminals. See figure 44 for loca- tion of terminal. This terminal is energized in the heat- ing mode when the indoor blower is is operating.
9 − One 24V
grated control terminal block. Any humidifier rated up to 0.5 amp can be connected to this terminal with the ground leg of the circuit being connected to either ground or the 4 for location of
terminal.
10 −Install the room thermostat according to the instruc- tions provided with the thermostat. See table 14 for thermostat connections. If the furnace is being matched with a heat pump, refer to the instruction packaged with the dual fuel thermostat.
NOTE − The discharge air temperature sensor is intended to be mounted downstream of the heat exchanger and air
conditioning coil. It must be placed in free airflow, where
other accessories (humidifiers, UV lights etc.) will not inter- fere with its accuracy. Wiring distance between the furnace and discharge air sensor should not exceed 10 ft. when
wired with 18−gauge thermostat wire.
TABLE 12
Run Length
Wire Run Length | AWG # | Insulation/Core Types | |
|
|
| |
Less than 100’ (30m) | 18 | Color−coded, temperature | |
rating 95ºF (35ºC) mini- | |||
|
| ||
More than 100’ (30m) | 16 | mum, solid core. (Class II | |
Rated Wiring) | |||
|
| ||
|
|
|
TABLE 13
Run Length
Wire Run Length | AWG # | Insulation/Core Types | |
|
|
| |
Maximum length of wiring |
| Color−coded, temperature | |
for all connections on the | 18 | rating 95ºF (35ºC) mini- | |
RSBus is limited to 1500 | mum, solid core. (Class II | ||
| |||
feet (457 meters). |
| Rated Wiring) | |
|
|
|
Thermostat Selection
The SLP98DFV is designed to operate in a variable rate ca- pacity mode using a two−stage thermostat. The SLP98DFV will automatically adjust firing rate based upon thermostat cycle times.
The icomfort Toucht thermostat must be used in commu- nicating applications. Refer to the instructions provided with the thermostat for installation, set−up and operation.
For optimal performance in non−communicating applica- tions, Lennox recommends use of a ComfortSense® 7000 high quality electronic digital thermostat or any other with adjustable settings for 1st stage / 2nd stage on / off differen- tials and adjustable stage timers.
Lennox recommends the following two−stage thermostat set−up for optimal variable rate capacity mode:
First heat stage differential set to 1/2 to 1 degree F; second heat stage differential set to 1/2 or 1 degree F; second heat stage upstage timer disabled, or set to maximum (1 hr mini- mum).
Indoor Blower Speeds
NOTE − When the SLP98DFV is used with icomfort Toucht thermostat, proper indoor blower speed selec- tions are made by the communicating thermostat.
Page 28
