Honeywell THM5421C1008 Benutzerhandbuch

68-0287—1

24

a

Humidification only operates in heating or when last call was for heating.

b

Dehumidification only operates in cooling or when last call was for cooling.

c

Must be set up in installer setup (ISU 379) for dehumidification with air conditioning.

d

Installer setup (ISU 406) must be setup for Ventilation in high humidity or nothing will happen.

e

Only with whole house dehumidifier.

In a multi-stage system, while maintaining setpoint, several 

factors affect when the next stage energizes, such as load 

conditions, environmental conditions, P+I control, and home 

insulation. The next stage energizes when the thermostat 

senses the previous stage is running at 90% capacity. This 

operation is droopless control.

Follow these steps to enter the User Setup:

1. Press and release the System key.

2. Press and hold the center blank key for approximately 

five seconds until the screen changes.

3. Release the center blank key when the screen on the 

thermostat matches the screen below.

Auto

Humidification

HUM1 and HUM2 Close

a

Nothing

a

None

Auto

Dehumidification

Nothing

b

DHM1 and DHM2 close

e

None

Auto

Dehumidification

Nothing

b

DHM1 and DHM2 open

c

Y

c

 and G

c

Auto

Ventilation

VNT1 and VNT2 Close

VNT1 and VNT2 Close

None

Heat or Em.Heat

Humidification

HUM1 and HUM2 Close

NA

None

Heat or Em.Heat

Dehumidification

VNT1 and VNT2 Close

d

NA

None

Heat or Em.Heat

Ventilation

VNT1 and VNT2 Close

NA

None

Cool

Humidification

NA

Nothing

a

None

Cool

Dehumidification

NA

DHM1 and DHM2 close

e

None

Cool

Dehumidification

NA

DHM1 and DHM2 open

c

Y

c

 and G

c

Cool

Ventilation

NA

VNT1 and VNT2 Close

None

SCHED HOLD CLOCK SCREEN

FAN

ON

AUTO

A

M

THU

SYSTEM

EM HEAT

OFF

COOL

Following

Schedule

Inside

M23502

DONE

CANCEL

TUE

EM HEAT

OFF

COOL

M23503

DONE

M22440