Honeywell VISIONPRO TH8320 User Manual download pdf (Page 31)

VisionPRO

8000 Touchscreen Programmable Thermostat

31 68-0280—01

Humidifier Pad Reminder

The Humidifier Pad change reminder must be turned on from

the Installer Setup. Once expired, the screen flashes,

“Change Humidifier Pad” and a Reset key appears. Press the

Reset key to reset the change reminder.

The remaining calendar days can be viewed by pressing the

More key. The remaining days can be edited using the More

key or from the Installer Setup. To view or reset the reminder

before it expires, follow these steps using the More key:

1. Press the More key until the Humidifier Pad change

reminder appears on the screen. This is the number of

calendar days remaining on the Humidifier Pad

reminder.

2. Press the Edit key.

3. Use the Up and Down keys to change the number of

calendar days.

4. Press the Done key to go back to the viewing screen.

5. Press the Reset key to activate the new number of days

selected in the previous screen.

6. Press the Done key to return to the Home Screen.

UV Lamp Reminder

The UV Lamp change reminder must be turned on from the

Installer Setup. Once expired, the screen flashes, “Change

UV Lamp” and a Reset key appears. Press the Reset key to

reset the change reminder.

The remaining calendar days can be viewed by pressing the

More key. The remaining days can be edited using the More

key or from the Installer Setup. To view or reset the reminder

before it expires, follow these steps using the More key:

1. Press the More key until the UV Lamp change reminder

appears on the screen. This is the number of calendar

days remaining on the UV Lamp reminder.

2. Press the Edit key.

3. Use the Up and Down keys to change the number of

calendar days.

4. Press the Done key to go back to the viewing screen.

5. Press the Reset key to activate the new number of days

selected in the previous screen.

6. Press the Done key to return to the Home Screen.

Temperature Recovery

The thermostat feature, Adaptive Intelligent Recovery™,

eliminates all guesswork when setting the thermostat

schedule.

Simply set the program schedule to the time that the comfort

temperature is desired. The thermostat then turns on the

heating or cooling at just the right time to have the home

reach the scheduled temperature at the scheduled time.

For example—get up at 6:00 AM and want the temperature to

be 70°F. Set the Wake period for 6:00 AM and 70°F. The

thermostat then turns on the heat before 6:00 AM to raise the

temperature to 70°F by 6:00 AM.

The thermostat alerts that the heating or cooling system is

coming on before a scheduled time by showing “Recovery” on

the screen.

NOTE: It takes about a week for the thermostat to adjust to

local weather, the schedule, the construction of the

home and the heating and/or cooling system. Each

day it adjusts the next day’s recovery start time

accordingly.

P+I Control

The thermostat microprocessor-based control requires that

the user understands temperature control and thermostat

performance. A conventional mechanical or electronic

thermostat does not control temperature precisely at setpoint.

Typically there is an offset (droop) in the control point as the

system load changes. This is a phenomenon that most people

in the industry know and accept. Many factors contribute to

offset including switch differential, thermal lag, overshoot,

cycle rates and system load.

The thermostat microprocessor simultaneously gathers,

compares and computes data. Using this data, it controls a

wide variety of functions. The special proprietary algorithm

(program) in the thermostat eliminates the factors causing

offset. This makes temperature control more accurate than

the conventional mechanical or electronic thermostats. The

temperature control algorithm is called proportional plus

integral (P+I) control.

The thermostat sensor, located on the thermostat or remote,

senses the current space temperature. The proportional error

is calculated by comparing the sensed temperature to the

programmed setpoint. The deviation from the setpoint is the

proportional error.

The thermostat also determines integral error, which is a

deviation based on the length of error time. The sum of the

two errors is the (P+I) error. The cycle rate used to reach and

maintain the setpoint temperature is computed using the P+I.

The additon of the integral error is what differentiates the

thermostat from many other electronic and mechanical

thermostats. See Fig. 31.

SCHED HOLD CLOCK SCREEN MORE

TUE

FAN

AUTO

SYSTEM

HEAT

Following

Schedule

Inside

Set To

Recovery

M22301

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Honeywell VISIONPRO TH8320 User Manual Page 31

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