Venstar ACC0430 Owner's Manual

HUMIDITY MODULE

ACC0430

Humidity

Humidity

Module

Module

When installed, the thermostat may have* the ability to:
Control a compatible humidifier
Display the relative humidity level as measured at
the thermostat
Dehumidify (cool to dehumidify, reheat, control
a dehum terminal equipped furnace board)

Not all thermostat models support every feature listed above.

*

Compatible with thermostat models: T1800, T2700, T2800
T2900. Consult VENSTAR for a complete list.

OWNER’S

OWNER’S

MANUAL

MANUAL

Venstar Inc. 08/07

Overview

This unique accessory allows you to view and control
the humidity level using only your thermostat and
HVAC unit.

Depending on the model number of your thermostat
the humidification options are:

View the ambient humidity at the thermostat
location

Control a humidifier with the HUM terminal on
the thermostat

Dehumidify using only the air conditioner

Dehumidify with Reheat using your HVAC’s
second stage electric strip heater

Dehumidify using the DEHUM terminal on your
furnace’s circuit board

Page 1

Installation

The humidity accessory is

inserted into the
humidity plug on the back of the thermostat
and the Humidity Jumper is set for HUM
operation.

Humidity Jumper

Set this jumper for
HUM.

W3

PROG

HUM

DEHUM

MISC3 MISC2 MISC1

W1

Y1

G

MISC2

CK1

CKGND

R

C

Humidity Module

(FAN)

ELEC

GAS

HP

Y2

(MISC1
ONLY)

INSTALL HUMIDITY

MODULE WITH SENSING

ELEMENT OUTWARD

GAS

B

O

W2

MISC1

HUM

NO HUM

RS2

MISC3

RS+5

Z

2

8

4

6

X

Rs1

1

1

RSGND

Y

3

579

Humidity Module
Model ACC0430

Plug the module into the appropriate
connection terminal on the circuit
board of the thermostat, as shown.

Thermostat
circuit board.

HUM

OR

NO HUM

Humidity Module
plug located on
the thermostat
circuit board.

Page 2