Viconics T021-M018 User Manual
T021-M018
Mixed Air Controller
• ONE 0 TO 10 Vdc COOLING OUTPUT
• MINIMUM POSITION ADJUSTMENT
APPLICATIONS
The model M18 is part of Viconics' Micro-Stat Series low
voltage RHVAC room temperature and humidity controls
line.
• Economizer control
• Mixed air control
ADVANCED DESIGN AND PI CONTROL
Advanced microcomputer electronics and PI control
algorithms provide precise temperature control.
DAMPER POSITION MINIMUM ADJUSTMENT
Minimum damper position is adjustable at the thermostat
with an internal potentiometer.
SPECIFICATIONS
Operating Conditions: -40 °C to 50 °C ( -40 °F to 122 °F )
Minimum position
adjustment:
Resolution: ± 0.1 °C ( ± 0.2 °F )
Control accuracy
(calibrated):
Specifications and equipment are subject to change without
prior notice.
022-0003 REMOTE SENSOR
( ORDER SEPARATELY )
0% to 95% R.H. non-condensing
0 to 100 %
Sensor: Remote 4.7 K NTC thermistor Sensor
model number: 022-0003
± 0.6 ° C ( ± 1.0 °F )
Range: 5 °C to 27 °C ( 40 °F to 80 °F )
Output:
Power: 24 VAC -15%, +10% 50/60 Hz; 2 VA
0 to 10 Vdc into 2KΩ resistance min.
Characteristics of 4.7 KΩ 22-003 remote sensor
180.0 °F 82.2 °C .549 Kohm
170.0 °F 76.7 °C .658 Kohm
160.0 °F 71.1 °C .793 Kohm
150.0 °F 65.6 °C .961 Kohm
140.0 °F 60.0 °C 1.170 Kohm
130.0 °F 54.4 °C 1.434 Kohm
120.0 °F 48.9 °C 1.768 Kohm
110.0 °F 43.3 °C 2.194 Kohm
100.0 °F 37.8 °C 2.741 Kohm
90.0 °F 32.2 °C 3.448 Kohm
80.0 °F 26.7 °C 4.370 Kohm
70.0 °F 21.1 °C 5.583 Kohm
60.0 °F 15.6 °C 7.186 Kohm
50.0 °F 10.0 °C 9.334 Kohm
40.0 °F 4.4 °C 12.229 Kohm
30.0 °F -1.1 °C 16.167 Kohm
20.0 °F -6.7 °C 21.580 Kohm
10.0 °F -12.2 °C 29.110 Kohm
0.0 °F -17.8 °C 39.683 Kohm
DIMENSIONS
3.4"
2.35"
0.425"
9"
2"
Isolation gasket
Screw mount ing hol e
22-003 sensor comes with 84" of wire
Viconics Electronics Inc. 9245, Langelier Blvd, St-Leonard, Quebec, Canada H1P 3K9
LIT-T2118-E01
0.425"
0.65"
sales@viconics.com
www.viconics.com
SEQUENCE OF OPERATION
When 24 Vac is applied to the thermostat, the minimum voltage output going to the actuator is 0 Vdc, or the value adjusted on
the minimal position potentiometer.
When the dry contact closes on the supply sensor wire, the free cooling mode is activated.
The setpoint is adjusted on the thermostat, the range of the setpoint is: 5 °C to 27 °C ( 40 °F to 80 °F ). The voltage output going
to the actuator when the free cooling is activated is the highest value between the PI supply loop or the minimum position
adjustment.
To close the damper two choices are available. Remove power to the thermostat and the control signal will drop to 0 Vdc, this
will close the actuator electrically. Or remove the power to the thermostat and the actuator, this will close the actuator on its
spring mechanism if it is equipped with one.
Sensor and thermostat are made to be operated at temperature as low as -40 °C ( -40 °F ).
WIRING
Return
Air
Fresh
Air
2 to 10 Vdc
actuator
Ex.: NF24-SR
Mix air setpoint
Fresh air damper
3
minimum
position
N.C.
1 2
N.O.
Output
0 - 10 Vdc
24 V.a.c.
Common
Remote
sen sor
M18
Supply
Fan
Optionnal contact from a
relay overrides the fresh air
damper to 100%
4
5
24 V.a.c.
6
7
22-003
Order
sensor
separately
Co nta ct fr om a relay
autho rizing free cooling
Viconics Electronics Inc. 9245, Langelier Blvd, St-Leonard, Quebec, Canada H1P 3K9
LIT-T2118-E01
www.viconics.com
sales@viconics.com
M:\1_BINDER\5_T021\M18\1_ENG\M18SE05.DOC 5/28/09
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