028 -0427-15 _UI-V T8350_ A4 _ EN www.viconics.com June 2020
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VT8350 [ User Interface Guide ]
CONFIGURATION 5/9
PARAMETER DETAILS
Conguration Parameters Default Value Signicance and Adjustments
CPH
Default value: 4
Cooling Output Cycles Per Hour
CPH is used to “modulate” On/Off outputs controlling equipment such as
compressors. When the Room Temperature is within the Proportional Band,
the output performs 3 or 4 CPH. A higher CPH represents a higher accuracy of
control at the expense of wearing mechanical components faster.
Note: The CPH does not limit the number of Cycles Per Hour. It is limited by the
“Anti short cycle” parameter. 4 CPH is typical for Rooftop applications.
Range: 3 to 8 CPH
Ctrl. type out1
Default value: On/Off
Control Output for FCU Valves
Denes type of control output for type of valves installed for the FCU application
0-10V DA: Direct Acting analog heating output signal for modulating control of
2-10 Vdc valves. DA = 0 to 100% = 0 to 10 Vdc
0-10V RA: Reverse Acting analog heating output signal for modulating control of
2-10 Vdc valves. RA = 0 to 100% = 10 to 0 Vdc
On/Off: normally opened or normally closed 24 VAC 2 position valves
Floating: modulating 3 wires control of 24 VAC oating valves
Choices: 0-10V DA, 0-10V RA, On/Off and Floating
Ctrl. type out2
Default value: Same as 1
Control Output for FCU Valves
Denes type of control output for type of valves installed for the FCU application
0-10V DA: Direct Acting analog heating output signal for modulating control of
2-10 Vdc valves. DA = 0 to 100% = 0 to 10 Vdc
0-10V RA: Reverse Acting analog heating output signal for modulating control of
2-10 Vdc valves. RA = 0 to 100% = 10 to 0 Vdc
Same as 1:
On/Off: normally opened or normally closed 24 VAC 2 position valves
Floating: modulating 3 wires control of 24 VAC oating valves
Choices: 0-10V DA, 0-10V RA, Same as 1, On/Off and Floating
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