User Guide

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Table Of Contents

Read and follow manufacturer instructions carefully. Follow all

local electrical codes during installation. All wiring must conform to

local and national electrical codes. Improper wiring or installation

may damage the sensor.

Recognize safety information. This is the safety alert symbol.

When the safety alert symbol is present on equipment or in the

instruction manual, be alert to the potential for personal injury.

Understand the signal words DANGER, WARNING, and

CAUTION. These words are used with the safety alert symbol.

DANGER identifies the most serious hazards which will result in

severe personal injury or death. WARNING signifies a hazard that

could result in personal injury or death. CAUTION is used to

identify unsafe practices which would result in minor personal injury

or property damage.

The Extra-Zone system is used to create a subzone within a larger

conditioned area. The subzone is created by controlling (opening or

closing) the dampers which send air into the subzone. The Extra-

Zone module can also be used to control ventilation to the zone.

For example, an Extra-Zone system is installed in an over-

conditioned conference room which gets too cold while other areas

of the building are being cooled. A person inside the room would set

the thermostat for Heat. The Extra-zone module compares the

thermostat demand (Heat), with the duct temperature (less than 80

degrees F), and closes the zone damper, keeping the room from being

overcooled.

The Venstar Extra-Zone system consists of 4 parts:

Field-supplied zone thermostat with power supply

Field-supplied zone damper

Duct sensor

Extra-Zone module

The zone thermostat determines the demand for the zone and sends

the information to the Extra-Zone module; it does not control the

HVAC equipment. The zone damper controls how much system air

is allowed into the zone. The duct sensor senses duct temperature

and sends information to the Extra-Zone module. The Extra-Zone

module takes the zone thermostat demand duct temperature

information and determines whether the zone damper will be open or

closed.

1. Install the field-supplied thermostat in the zone. Be sure to

follow all recommendations regarding thermostat location described

in the thermostat installation instructions.

2. Install the Extra-Zone module in a location near the supply duct and

damper. The duct sensor is pre-wired to the Extra-Zone module.

Make sure that the Extra-Zone module is placed close enough to the

desired duct sensor location.

3. Connect the thermostat to the Extra-Zone module. Connect the C,

R, W, Y, and G terminals of the thermostat to the C, R, W, Y, and G

terminals of the Extra-Zone module (see Fig. 1 on reverse side).

4. The power supply can be connected to the thermostat or the Extra-

Zone module. Connect the C and R terminals of the power supply to

the C and R terminals of the thermostat or the Extra-Zone module. Do

not connect separate power supplies to both devices.

5. If not already installed, install the field-supplied zone damper(s) in

the supply side duct(s), which will provide conditioned air to the zone.

6. Run the duct sensor from the Extra-Zone module to the supply duct

of the damper. Install the duct sensor in the supply duct a few feet

before the zone damper. If the duct temperature sensor wiring is not

long enough, use a 3-conductor thermostat cable (18 to 24 gauge).

This cable is NOT suitable for any length greater than 75 feet. Be

sure to wire cap and tape all connections.

7. Connect the Extra-Zone module to the damper(s). Connect the

BROWN wire from the Extra-Zone module to the COM terminal of

the damper. Connect the RED wire of the Extra-Zone module to the

OP (open) terminal of the damper. Connect the WHITE wire of the

Extra-Zone module to the CL (close) terminal of the damper (see

Fig. 1). Up to four dampers may be controlled by one Extra-Zone

module. ( see Fig. 2 for wiring multiple dampers).

Heating and Cooling Control

The zone thermostat is located inside the subzone and does not

directly control the HVAC unit. Duct temperature and zone thermostat

demand are compared to determine if the dampers will open or close.

(See Table 1 below.)

OVERVIEW

INSTALLATION

©Venstar Inc. 12/07

P/N 88-700 Rev. 2

OPERATION

Page 1

SAFETY CONSIDERATIONS

IMPORTANT: Read entire instructions before turning on

the thermostat.

INSTALLATION INSTRUCTIONS

ACC0450

MODEL

EXTRA-ZONE™

ACCESSORY

Call for cool

Open

Closed

Open

Call for heat

Call for cool

80 F or above

No demand,

Fan set to AUTO

No demand,

Fan set to ON

70 F or below

Less than 80 F

Greater than 70 F

70 F to 80 F

Below 70 F or above 80 F

70 F to 80 F

Below 70 F or above 80 F

THERMOSTAT

DEMAND

DUCT

TEMPERATURE

DAMPER

POSITION

Table 1

Extra-Zone Control Settings

Summary of content (2 pages)

PAGE 1
EXTRA-ZONE™ ACCESSORY MODEL ACC0450 INSTALLATION INSTRUCTIONS 2. Install the Extra-Zone module in a location near the supply duct and damper. The duct sensor is pre-wired to the Extra-Zone module. Make sure that the Extra-Zone module is placed close enough to the desired duct sensor location. IMPORTANT: Read entire instructions before turning on the thermostat. SAFETY CONSIDERATIONS Read and follow manufacturer instructions carefully. Follow all 3. Connect the thermostat to the Extra-Zone module.
PAGE 2
EXTRA-ZONE™ ACCESSORY MODEL ACC0450 Ventilation Control If the room thermostat is not set for heating or cooling (no demand), the Extra-Zone module will provide ventilation to the room based on the Fan setting. If the fan is set to ON, the damper will remain open while the duct temperature is between 70 and 80 degrees F. If the fan is set to AUTO, the damper will remain closed while the duct temperature is between 70 and 80 degrees F.