Home > SMART TEMP > SMART TEMP SMT-131 Hotel Touchscreen Thermostat User Manual
SMART TEMP SMT-131 Hotel Touchscreen Thermostat User Manual
Note - When the SMT-131 calls heating or cooling the SMT-131 will drive both the relays and the
0-10V outputs simultaneously. This way the SMT-131 can call a circulating water pump via the
relays as it controls room temperature with valves if needed.
0-10v Outputs
To permit the control of modulating heating and cooling valves as well as variable speed DC fan
motors or variable capacity HVAC systems the SMT-131 has been fitted with 3 x 0-10V outputs.
The 0-10V outputs in the SMT-131 are PI (Proportional Integral) controlled. This control method
provides the most accurate and cost-effective way to control heating and cooling valves by
ensuring set temperate are reached as quickly and efficiently as possible while reducing
temperature overshoot.
As the SMT-131 is fitted with both relays as well as 0-10V outputs to control HVAC systems there
may be some slight disparity between the thermostat display and the 0-10V outputs actions. The
SMT-131 displays the relay actions more than the actions of the 0-10V outputs on the LCD. In
most cases these are very closely matched however as the 0-10v outputs have the capability of
providing finer control than do the ON/OFF relays the heating and cooling calls may have started
slightly before indicated on the thermostat display. This is true of the fan also.
A1 – Cool
This output is used to control a cooling valve.
A2 – Heat
This output is used to control a heating valve.
A3 – Fan
This output is used to control a variable speed fan or a
variable capacity AC system. If the fan mode is set to
Auto speed the 0-10V output will vary between these two values based on calculated demand. If
the user selects LOW speed, the 0-10V output will be fixed at 3.3VDC, when Medium speed is
selected the 0-10V output will be fixed at 6.6VDC. High speed is set to 10VDC
The installer menu provides the following settings for the control of the three 0-10V outputs.
Span
This is the value where the output is at maximum value. It sets how aggressive the 0-10V will
move for a given temperature change. Range is 0-5C
Time Interval
Time interval sets the running average calculation time. The smaller the number the faster the 0-
10V output will respond to room temperature changes. Range is 10 – 300 seconds.
Direction
Forward action 0V = 0% open and 10V = 100% open; reverse action sets 0V = 100% open and 10V
= 0% open.
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.
Page 7
| General | Details |
|---|---|
| Name | SMART TEMP SMT-131 Hotel Touchscreen Thermostat User Manual |
| Make | SMART TEMP |
| Language | English |
| Filetype | PDF (Download) |
| File size | 0.34 MB |
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