Lennox International Inc SL28003, XP2101, XC2105 Setting up typical systemsT PUMP DUAL FUEL, Tips

Setting up typical systemsT PUMP (DUAL FUEL)

icomfortt−enabled Furnace & icomfortt−enabled HP unit (Dual fuel)

Dual fuel system using an icomfort−enabled gas furnace (G71MPP, EL296V, SLP98, SL280) with an icomfort−enabled heat pump (XP17 or XP21 only).

1. Wiring Communicating System Wiring diagram on Page 59

and Optional Accessories Wiring (Page 61) for any accessories be- ing installed with the system.

D4−conductor thermostat wire from the icomfort Wi-Fit thermostat to the gas furnace (R, i+, i−, C)

D4−conductor thermostat wire from the furnace terminal strip to the icomfort−enabled HP (R, i+, i−, C)

DWiring as required for accessories

2.DO NOT cut any option link on furnace control.

3.After the entire system is wired, power up the system; the icomfort Wi- Fit thermostat will check the system for installed communication de- vices.

4.On the thermostat, go past the

vices" to the o adjust a setting" screen. Select from the de- vice list using the up/down arrows and press the edit button

5. Select Balance Point Control and press edit. Use the down arrow to

selectsave. High and Low Balance Points will ap- pear in red.

6.Complete Balance Point Control by editing the High and Low Balance Points. It is not necessary to change the defaults, but you must save each setting. The red settings will go away after pressing save. Press the back button to return to the adjust screen.

7.Use the arrows to select

edit. From this Furnace screen you will have access to the various air- flow settings. Set the system air volumes according the needs of the home. When you change certain settings, the system will prompt you to

red settings and press edit. Either make changes or not, but press save either way. The red settings will go away after pressing save.

When all CFM settings are complete, press the back button. Press next step to advance to the tests button.

8.Test the system operation and confirm the HP unit is electrically ener- gized and operational. Press done.

9.Exit the installer setup mode by selecting the EXIT button.

TIPS

SHigh & Low Balance points are enabled and adjusted under the install-

er section of the thermostat. In the equipment button select

and press edit. Scroll down to Point Control" and press edit and select Enabled and then save.

SAn outdoor temperature sensor is provided in an icomfort−enabled heat pump unit. To display the outdoor temperature on the home screen of the thermostat, you must turn on (or off) the emp Display".

From the Home screen, press press for more area and select the HELP icon. Press the user preferences box and scroll down to door Temp Display". Press the modify button and use the up/down ar- rows to select On (or Off) and then press the save button. Press done to return to the Home screen.

STurn the Indoor Humidity Display on and off in a similar manner as above.

SGas heat is not provided to temper the air during defrost cycles.

icomfortt−enabled Furnace & non−communicating HP unit (Dual fuel)

NOTE − DO NOT use a conventional non−communicating heat pump unit in an icomfort dual fuel system.

TIPS

SA conventional thermostat capable of controlling a dual fuel system, like the ComfortSense® 7000, must be selected for this type of applica- tion.

Page 67 icomfort Wi-Fit 7−Day Programmable Communicating Thermostat