Venstar T2900SCH Installation Instructions Manual

Digital

Digital

Thermostat

Thermostat

commercial

SCHOOL THERMOSTAT

T2900SCH

PROGRAMMABLE

PROGRAMMABLE

up to 3-heat

up to 3-heat

& 2-cool

& 2-cool

Energy Saving Operation
Morning Warm-up Period
Programmable Override
Unoccupied until button press
Perfect for Classroom Operation
Setpoint Limiting Security
Separate Weekend/Weekday
Programs
99 Days of Configuration
Holiday Mode

HEAT
COOL

Soft Start Capability
Back-Lit Display
One for All Works with
Virtually All Equipment
Non-Volatile Memory
Keypad Lockout
3 Security Levels
Remote Sensor Ready
48 Hour Clock Backup
Compressor Protection
Economizer Operation

HEAT
PUMP

Designed Specifically for the School Environment

Use with most Air Conditioning & Heating Systems including: 1 or 2 Stage
Electric Cooling & 3 Stage Gas Heating, Heat Pump, Electric or Hydronic Heat.

INSTALLATION

INSTALLATION

INSTRUCTIONS

INSTRUCTIONS

Venstar Inc. 08/07

CAUTION

Follow the Installation Instructions before proceeding.
Set the thermostat mode to “OFF” prior to changing
settings in setup or restoring Factory Defaults.

CAUTION

NEVER PUT MORE THAN ONE
JUMPER ON THE SAME MISC
JUMPER BLOCK!

THIS MAY DAMAGE YOUR
THERMOSTAT AND VOID
YOUR WARRANTY.

MISC3

OK

NOTE: Due to variations in environmental conditions, it is not

always possible to achieve the desired humidification or
dehumidification setpoint.

This device complies with Part 15 of the FCC Rules. Operation is
subject to the following two conditions: (1) this device may not cause
harmful interference, and (2) this device must accept any interference
received, including interference that may cause undesired operation.

Thermostat T2900SCH

Tested to Comply

c

with FCC Standards

C

F

4Z95

FOR HOME OR OFFICE USE

MISC3

Page i

Table of Contents

Preparation

Remove & Replace the
Old Thermostat

Configuring the MISC
Outputs

Wire Connections

Sample Wiring
Diagrams

Test Operation

Calibrating the
Thermostat Sensors

TroubleShooting

1
2
3
4
5
6
7
8

Page iii

SECTION 1

Preparation

1

WARMER

Proper installation of the thermostat will be

Pm

I2:00

74

COOL

AUTO

HEAT

72

COOLER

Push to Start

Push and hold 5 seconds

for shutdown

accomplished by following these step by step
instructions. If you are unsure about any of these
steps, call a qualified technician for assistance.

Assemble tools

WARMER

Pm

I2:00

74

COOL

AUTO

HEAT

72

COOLER

Push to Start

Push and hold 5 seconds

for shutdown

Flat Blade
Screwdriver

WARMER

Make sure your Heater/Air Conditioner is working

Pm

I2:00

74

COOL

AUTO

HEAT

72

COOLER

Push to Start

Push and hold 5 seconds

for shutdown

properly before beginning installation of the

Wire cutter
& Stripper

thermostat.

WARMER

Pm

I2:00

Carefully unpack the thermostat. Save the screws,

74

COOL

AUTO

HEAT

72

COOLER

Push to Start

Push and hold 5 seconds

for shutdown

bracket, and instructions.

WARMER

Pm

I2:00

74

COOL

AUTO

Turn off the power to the Heating/Air Conditioning

HEAT

72

COOLER

Push to Start

Push and hold 5 seconds

for shutdown

system at the main fuse panel. Most residential
systems have a separate breaker for disconnecting
power to the furnace.

Page 1.1

SECTION 2

Remove & Replace the Old Thermostat

WARMER

Remove the cover of the old thermostat.

Pm

I2:00

74

COOL

AUTO

HEAT

72

COOLER

Push to Start

Push and hold 5 seconds

for shutdown

If it does not come off easily check for screws.

WARMER

Loosen the screws holding the thermostat

Pm

I2:00

74

COOL

AUTO

HEAT

72

COOLER

Push to Start

Push and hold 5 seconds

for shutdown

base or subbase to the wall, and lift away.

WARMER

Pm

I2:00

74

COOL

AUTO

Disconnect the wires from the old thermostat.

HEAT

72

COOLER

Push to Start

Push and hold 5 seconds

for shutdown

Tape the ends of the wires as you disconnect
them, and mark them with the letter of the
terminal for easy reconnection to the new
thermostat.

WARMER

Keep the old thermostat for reference purposes

Pm

I2:00

74

COOL

AUTO

HEAT

72

COOLER

Push to Start

Push and hold 5 seconds

for shutdown

until your new thermostat is functioning properly.

2

Page 2.1

SECTION 3

Configuring the MISC Outputs

3

Section 3 Contents:

Configuring the Jumpers........3.2

Explanation of Jumper

Settings..................................3.3

Page 3.1

Configuring the Jumpers

For additional flexibility, your thermostat has three configurable
outputs. These outputs are designed to have different functions
depending on how the jumpers are set (below).
Each output, labeled MISC1, MISC2, and MISC3 may be set for one
of the six choices available.
In the diagram below, the MISC3 jumper has been set for HUM*
(humidification) operation, the MISC2 jumper has been set for
DEHUM* (dehumidification) operation, and the MISC1 jumper has
been set for PROG (programmable) operation.

(FAN)

PROG

DEHUM

ECON

MISC2

CKGND

HUM

W3

MISC3 MISC2 MISC1

W1

Y1

G

CK1

R

C

ELEC

GAS

HP

GAS

2

4

INSTALL HUMIDITY

1

3

B

O

W2

MISC1

HUM

NO HUM

RS2

MISC3

RS+5

Z

8

6

X
1

RSGND

Y

579

Y2

(MISC1
ONLY)

MODULE WITH SENSING

ELEMENT OUTWARD

W3

PROG

HUM

DEHUM

ECON

MISC3 MISC2 MISC1

*The Humidity Module (sold separately) must
be installed to operate a humidification
and/or dehumidification system.

(MISC1

ONLY)

Y2

CAUTION

NEVER PUT MORE THAN

ONE JUMPER ON THE SAME

MISC JUMPER BLOCK!

DOING SO MAY DAMAGE

YOUR THERMOSTAT AND

VOID THE WARRANTY.

Page 3.2

MISC3

OK

MISC3

3