Honeywell T8611G Chronotherm IV Deluxe Manual page 18

T8611G CHRONOTHERM
Thermostat Operation
Startup
When power to the thermostat is turned on, a startup and
initialization program begins. The startup occurs only on initial
powerup. After total loss of power for an extended period, the
current time and day may need to be set, but the user
program is held. See Table 11 for the default values.
NOTE: Immediately following initialization, the user can
enter new setpoints to be used in place of the
default values.
Table 11. Default Time, Setpoint and Fan Settings.
Heat
Period Time Setpoint
Wake 6:00 AM 70°F
(21°C)
Leave 8:00 AM 62°F
(16.5°C)
Return 6:00 PM 70°F
(21°C)
Sleep 10:00 PM 62°F
(16.5°C)
68-0165—1
®
IV DELUXE PROGRAMMABLE HEAT PUMP THERMOSTAT
Cool Fan
Setpoint Setting
78°F Auto
(25.5°C)
85°F Auto
(29.5°C)
78°F Auto
(25.5°C)
82°F Auto
(28°C)
Adaptive Intelligent Recovery® Feature
Adaptive Intelligent Recovery® control assures that the
comfort setting is achieved at the programmed time
regardless of weather conditions. Conventional recovery,
however, starts recovery at the beginning of the programmed
time period and used the equipment to achieve the comfort
settings as soon as possible.
Adaptive Intelligent Recovery® control calculates the
recovery ramp based on the number of degrees away from
the desired setpoint, previous equipment performance, and
weather history to initiate recovery at the optimal time to
achieve the comfort setting at the desired time.
The Chronotherm® IV uses two recovery ramps, one for the
compressor and one for the auxiliary heat. Once the room
temperature intersects the compressor ramp, the compressor
snaps on until the setpoint is reached. If the temperature does
not rise fast enough and intersects the second ramp, the
auxiliary heat comes on. If the setpoint is reached too early or
too late, the ramp is adjusted for the next day's recovery.
See Fig. 14.
Unlike the Chronotherm® III, the Adaptive Intelligent
Recovery® can be turned off in the Installer Set-up mode.
Honeywell does not recommend this because the auxiliary
heat comes on once the program time begins, and runs
continuously until the setpoint is reached.
Fig. 14. Gradual temperature change in recovery.
18
COMPRESSOR SETPOINT
AUXILIARY HEAT SETPOINT
ROOM TEMPERATURE
WAKE
M6406A