Viconics T550 User Manual

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APPLICATIONS

VAV box control

•

Proportional room electric heating control

•

Proportional room hot water heating control

•

Air conditioning control

•

ADVANCED DESIGN AND PI CONTROL

Advanced microcomputer electronics and PI control algorithms provides precise temperature control and eliminates wasted heating energy caused by the typical On-Off cycling in conventional thermostats. As a result the room occupant is able to reduce the setpoint or desired temperature to the lowest comfortable setting. The result is energy savings ranges from 5% to 10%.

DAY-NIGHT MODE

A night mode, initiated by a remote timer or computer contact, provides energy savings during unoccupied periods of up to 10 %, without sacrificing comfort in occupied rooms. A flashing LED indicator warns an person in an occupied room that the thermostat is in Night mode. The occupant may override this condition locally for 4 hours by pressing the switch on the thermostat.

HIGH COOLING SIGNAL OUTPUT

A optional 0 to 10 Vdc cooling voltage output can be wired to other thermostats and used as a signal to a voltage relay to initiate cooling demand.

REPROGRAMMABLE

Each thermostat is computer calibrated and factory programmed to the ordered specification. However, over 10 control parameters ( such as heating/cooling mode, stage differential, night set-back etc. ) may be changed in the field with programming tool without having to remove the thermostat cover. The C263 also doubles as a diagnostic tool and indicates the status of all the inputs and outputs to each stat, and will reduce troubleshooting time by quickly identifying the specific problem.

COVERS

The thermostats are available with 4 covers options in either °C and °F. Thermostat cover plugs in to base for easy wiring and service. The base fits onto a standard electrical box. The User adjustable front models feature internally selectable minimum and maximum setpoint knob stops.

T500 T550

ELECTRONIC THERMOSTAT:

• TRI-STATE FLOATING DAMPER MOTOR OUTPUT

• TWO MORE STAGES

• DAMPER CHANGEOVER INPUT

• DAY-NIGHT MODE ( T550 ONLY )

The model T500 and T550 are part of Viconics' Micro-Stat Series low voltage RHVAC room temperature and humidity controls line.

DAMPER CHANGEOVER INPUT

When the damper operation is selected for cooling mode, a closed contact to the changeover input will reverse the operation of the damper motor to heating mode. In the automatic mode a duct sensor (S60 or S70) must be installed just before the VAV box. When duct temperature is higher than room heating set point, the damper operates in heating mode. When duct temperature is lower than room cooling set point the damper operate in cooling mode. With the recirculation mode selected, when the supply temperature is in the dead zone between the heating and cooling set point, the damper goes fully open to allow full ventilation. This feature improves air quality and reduces temperature variations across the room.

CONTROL OUTPUTS FOR ALL APPLICATIONS

The thermostats are available with various outputs to drive:

Relays

•

Contactors

•

Solenoids

•

Valves

•

SENSORS

Each thermostat can be either room or duct mounted with local or remote sensors, and can be selected by an internal jumper.

SPECIFICATIONS

Operating Conditions: 0 °C to 50 °C ( 32 °F to 122 °F )

Sensor: Local 47 K NTC thermistor

Resolution: ± 0.1 °C ( ± 0.2 °F )

Control accuracy:

( calibrated )

Ranges:

Outputs: Isolated Triac: 30 Vac at ½ A max.

Power: 24 Vac -15%, +10% 50/60 Hz; 2 VA

DIMENSIONS

3.275"

( 83 mm )

OR FROM BACK

BASE

WIRING FROM TOP

SECURITY SCREW

Specifications and equipment are subject to change without prior notice.

Motors

•

SSR's

•

SCR Power Controllers

•

Three position motor

•

0% to 95% R.H. non-condensing

± 0.2 ° C ( ± 0.4 °F ) for low ranges ± 0.9 ° C ( ± 1.8 °F ) for high ranges

10 °C to 32 °C ( 50 °F to 90 °F )

-18 °C to 82 °C ( 0 °F to 180 °F )

0 to 10 Vdc into 2KΩ resistance min. 0 / 5 Vdc at 20 mA max. for both outputs.

VERTICAL

MODEL

2.8"

( 71 mm )

135

180

4.5"

114 mm

COVER

HORIZONTAL MODEL

VICONICS

4.5"

( 114 mm )

2.8"

( 71 mm )

1.275" 32 mm

ORDER CODE

COVERS ALL YOUR THERMOSTATS NEEDS

APPLICATION EXAMPLES

T500 - AB - CD - EF - GH ( without day-night mode )

T550 - AB - CD - EF - GH ( with day-night mode )

A Output no. 1 ( controlled device ) Type

0 Not installed

5 "SSR" with 3-32 Vdc input Pulsed 0/5 Vdc

6 0 to 10 Vdc actuator, voltage relay or "SCR" * 0 to 10 Vdc

7 0 to 10 Vdc high cooling signal for Vdc relay Higher signal

B Output no. 2 ( controlled device ) Type

0 Not installed

1 Relay, thermal relay, two position motor Isolated Triac

2 Normally open thermal valve Isolated Triac

3 Normally close thermal valve Isolated Triac

4 "SSR" with 24 Vac input Isolated Triac

5 "SSR" with 3-32 Vdc input Pulsed 0/5 Vdc

C Output no. 1 and 2 control mode

1 Heating, reverse acting, ( RA )

2 Cooling, direct acting, ( DA )

3 Heating, RA ( no. 1 ) and cooling, DA ( no. 2 )

4 Cooling, DA ( no. 1 ) and heating, RA ( no. 2 )

D Main control sensor location

1 Room, inside thermostat, or ( duct return air**)

2 Duct supply air **

** Order with S60 or S70 sensor

E Setpoint adjustment

1 User adjustable

2 Blind cover

F Scale

10 °C to 32 °C ∗ Standard

50 °F to 90 °F

G Output no. 3 Damper changeover input

1 Normally cooling, ( DA ) Common dry contact for all thermostats

2 Normally heating, ( RA ) Com mon dry contact for all thermostats

3 Automatic Duct supply sensor **

4 Automatic

with recirculation ** Order with S60 or S70 sensor

H Maximum running time of tri-state floating actuator

1 1 minute

2 2 minutes

... etc.

9 9 minutes

Example: T550 - 75 - 41 - 12 - 12 One higher signal cooling output and one "SSR" 3-32 volts heating output. Main sensor located inside the room. Setpoint adjustable by user. Scale 50 °F to 90 °F. T he output no. 3 is a dam per with a travel time of 2 minutes used in cooling mode. Note: Order remote sensor separately.

Duct supply sensor **

∗ Standard

WIRING

For complete technical information on wiring, commissioning and servicing, please refer to the T500 / T550 service manual.

From simple...

Pressure dependent VAV Tri-state floating actuator

Day-night mode

TRI-STATE FLOATING ACTUATOR

2 MINUTES MAX. RUNNING TIME

DAY-NIGHT

24 VAC

T550-00-11-12-12

To more complicated...

Pressure dependent VAV c/w changeover Tri-state floating actuator Modulating duct heater, SCR 0 to 10 Vdc Hydronic perimeter heating

TRI-STATE FLOATING ACTUATOR

5 MINUTES MAX. RUNNING TIME

ELECTRIC DUCT HEATER WITH 0 TO 10 Vdc SCR

S60 SENSOR

24 VAC

T500-62-11-11-35

N.O. THERMAL VALVE

To sophisticated applications !

Hydronic heating and cooling Tri-state floating actuator 1 stage on-off electric duct heater Hydronic supply changeover sensor Day-night mode Blind cover

24 VAC DAY-NIGHT

T550-01-11-22-32

Represented by:

1 STAGE ELECTRIC DUCT HEATER

S90 SENSOR

TRI-STATE FLOATING ACTUATOR

2 MINUTES MAX. RUNNING TIME

...

Viconics Electronics Inc. 9245, Langelier Blvd, St-Leonard, Quebec, Canada H1P 3K9 www.viconics.c om

T550SE15.DOC 6/7/02