Viconics C1024 - Manual

1
ELECTRONIC THERMOSTAT: C1024
FOR THERMOELECTRIC ZONE VALVES
Modulating 24 Vac pulsed output
For N.O. or N.C. valves
For heating or cooling applications
DESCRIPTION
The C1024 series thermostats are microcomputer-based,
proportional and integral (PI) devices with one 24 Vac pulsed
output ( time proportioning ). The thermostats are designed
to be used with thermoelectric valve actuators ( wax valve ).
The output modulates the amount of open time vs. close time
on an 8 minutes cycle. The thermoelectric valve is either fully
open or fully closed. The best performances are on
perimeter reheat with hydronic hot water baseboards.
The thermostats also contain one dip switch to adjust for the
following applications:
• Heating with N.C. valves
• Cooling with N.O. valves
• Heating with N.O. valves
• Cooling with N.C. valves
HOW TO ORDER
C1024 -
↓
01 = °C & °F scale with blind cover
Internal setpoint adjustment
↓
02 = 10 to 30 °C scale
↓
03 = 50 to 90 °F scale
DIMENSIONS
SPECIFICATIONS
Operating Conditions: -30 °C to 50 °C ( -22 °F to 122 °F )
0% to 95% R.H. non-condensing
Sensor: Local 47 K NTC thermistor
Resolution: ± 0.1 °C ( ± 0.2 °F )
Control accuracy: ± 0.2 ° C ( ± 0.4 °F ) ( calibrated )
Ranges: C1024-01: Blind °C & °F
C1024-02: 10 °C to 32 °C
C1024-03: 50 °F to 90 °F
Proportional band for room
temperature control: 1.8°C ( 3.2°F )
24 Vac pulsed output: 0.5 A max at 30 Vac.
Power: 24 Vac -15%, +10% 50/60 Hz; 2 VA
24 Vac PULSED OUTPUT (TIME PROPORTIONING)
This output is designed to give true PI time proportioning
modulation out of 2 position 24 Vac on/off relays or valves.
This time proportioning modulation gives a much more
precise temperature control than conventional mechanical on
/ off thermostats with anticipator. When stabilized, the
thermostats will cycle the end device ( relay or valve ) 8 times
per hour with a duty cycle that varies with demand.
The 24 Vac pulsed output controls the room temperature
using a time proportioning control algorithm on an 8 minute
time cycle.
Ex.:
PI demand Time on Time off Total cycle
50 % 4 min. 4 min. 8 min.
25 % 2 min. 6 min. 8 min.
THERMOSTAT INSTALLATION
Important: Electronic controllers require special care for
wiring and startup. To avoid problems, carefully follow
the procedures below.
Be sure to have all the literature on hand for all components
installed: controller, actuators, relay, etc...
Look at the wiring diagrams, and study them carefully. Be
sure that you understand how the system is supposed to
work.
Make the wiring according to the wiring diagrams. Respect
polarity for power terminals # 3 & # 4 between multiple
controllers if the same transformer is used.
• Remove security screw on left side of thermostat cover.
•
Open up by pulling on the bottom side of thermostat.
32 mm
( 71 mm )
2.8"
1.275"
( 83 mm )
3.275"
SECURITY SCREW
OR FROM BACK
FROM TOP
WIRING
BASE
( 114 mm )
4.5"
50
70
60
90
80
F