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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.
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
(starting on page 15)
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 SMT-131 you must enter the installer menu and set
valve type to “Belimo™
M
ode”.
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).
2 Pipe Mode
The SMT-131 can measure water temperature via a sensor strapped to the water pipe and wired
into the SMT-131 Sensor input terminals (SI and Com 0-10 input). Based on the pipe temperature,
the room temperature and the set point the SMT-131 will control either the heating or the cooling
outputs to maintain guest comfort.
When 2 pipe is mode is used, the SMT-131 will occasionally open the water valve to allow water
flow within the pipe so the SMT-131 can sample pipe temperature to determine / confirm
operation mode.
If mode selection is permitted, the SMT-131 will only permit the appropriate mode to be selected
based on the pipe temperature.
To use the SMT-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.
(See page 16)
The pipe sensor needed for 2 pipe mode is the RS-1d sensor - available as an optional part from
Smart Temp or an authorised distributor.
Содержание SMT-131
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