Lennox International Inc. 81M28 - Manual (Page 22)

INSTALLER settings (continued)
AUXILIARY HEAT
With the 81M28, either an electric or gas heat source can be used as an auxiliary backup to the
heat pump. Choose STANDARD-COMP=ON if an electric backup source is to be used. Choose
ADD ON-COMP=OFF is a gas backup source is to be used.
RESIDUAL COOL
In order to get greater efficiency from the cooling system, the fan can be programmed to run for
0 (OFF), 30, 60, 90, or 120 seconds after the air conditioner has shut off. Residual cool may
interfere with proper system operation. Consult the system operating manual.
BALANCE POINTS
This screen will appear only when the outdoor sensor (Part #46M98) is connected to the 81M28
thermostat. When this sensor is used with the 81M28, you can set the lower and upper
temperatures to disable or enable 2nd stage heat.
At outdoor temperatures above the high balance point, only the heat pump is allowed to run. At
outdoor temperatures below the low balance point, only the auxiliary heat source is allowed to run.
At outdoor temperatures between the high and low balance points, both the heat pump and the
auxiliary heat source are allowed to run.
AUTO CHANGEOVER
When turned on, the thermostat will switch automatically between heating and cooling to maintain
the optimal temperature in your home.
When Auto Changeover is enabled in Installer Settings, it will also appear in the HEAT/COOL
menu described earlier. Auto Changeover must be enabled in both places in order to function.
22
INSTALL MENU SELECT
AUTO CHANGEOVER
DISABLE
ENABLE
INSTALL MENU SELECT
AUXILIARY HEAT
STANDARD - COMP. =ON
ADD ON - COMP. =OFF
INSTALL MENU SELECT
RESIDUAL COOL
SECONDS DELAY 60
INSTALL MENU SELECT
BALANCE POINTS
LOW BALANCE 45 ˚F
HIGH BALANCE 95 ˚F
110-1052F 5/12/05 11:59 AM Page 22