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SRC-131 Hotel Controller Manual
8
4.7
Minimum Value
Rather than start the output at 0V, when the output is called it will immediately jump to this value. It will then
vary the output to maximum. When approaching set point the value will drop from the minimum value to 0v in 1
step. This setting is particularly useful for fan control as it will not permit the fan to run too slowly when close to
set point.
4.8
Maximum Value (Fan A3) output only
When controlling 0-10V fans sometimes it is necessary to limit the fan speed to reduce noise or to protect
ducting. The fan output has a high voltage limit setting so regardless of the user selected speed (High, Medium
or Low) or thermostat selected auto speed the 0-10V output will not exceed this pre-set high limit.
These settings can be found in the installer menu.
4.9
Belimo ™ 6 Way Valve
Belimo™ manufactures an actuator that is in full cooling at 2V, off at 6V and full heating at 10V. To use this type
of actuator with the Smart Temp SRC-131 you must enter the installer menu and set valve type to “Belimo™
Mode”. The heating 0-10v output only is used in this mode
Information on the installer menu can be found on page 14 of
this manual.
As with normal valves, the 0-10V heating and cooling
span settings in the installer menu scale the heating and
cooling outputs. Factory default is full heating and full
cooling 1°C from set point. The heating and cooling span can
be adjusted independently to a maximum of full heating and
full cooling 3°C from set point. The output is linear.
Note
When using “Belimo” ™ mode, both the A1 “cool” and the A2 “Heat” 0-10 output are used. Both will
provide the same output to the value. (The A3 “fan” output will remain unchanged and can be used to control a
DC fan or other devices).
4.10
2 Pipe Mode
The SRC-131 can measure water temperature via a sensor strapped to the water pipe and wired into the SRC-
131 Sensor input terminals (SI and Com 0-10 input). Based on the pipe temperature, the room temperature and
the set point the SRC-131 will control either the heating or the cooling outputs to maintain guest comfort.
When 2 pipe is mode is used, the SRC-131 will occasionally open the water valve to allow water flow within the
pipe so the SRC-131 can sample pipe temperature to determine / confirm operation mode.
If mode selection is permitted, the SRC-131 will only permit the appropriate mode to be selected based on the
pipe temperature.
To use the SRC-131 in 2 pipe mode set DIP 2 OFF and DIP 4 to the ON position. Set Installer menu
option 26 “Si & Com 0-V” to option “3” – 2 Pipe Mode.
The pipe sensor needed for 2 pipe mode is an external NTC sensor - available as an optional part.
