On the provided list of device serial numbers, document the location of each Thermostat.
Open the SMT-131 wall controller by placing a flat-blade screwdriver or coin in the slot on the bottom of the thermostat case and gently twist to release the case locking clip. Gently pry the two case halves apart at the base taking care not to twist the case as this may crack the LCD.
The SMT-131 should be mounted in a convenient location at approximately 1.2 to 1.5 meters from the ground. It should be located in a “typical” location where it will sense the accurate room temperature and not be affected by direct sunlight or drafts. It is highly recommended that any penetrations in the wall where wiring may pass for example be sealed to prevent drafts from entering the rear of the thermostat and effecting the room temperature sensor accuracy. Take care to ensure excess wiring is not trapped between the cases half’s when closing – push excess wires into the wall cavity. Never press on the LCD when closing the SMT-131 as it may crack. Always press on the SMT-131 plastic case only.
| Switch | Function | ON | OFF |
| Sw1 | Indoor Fan Mode | 3 Fan Speed | 1 Fan Speed |
| Sw2 | Equipment Type | Heat Pump | Heat Cool |
|
Sw3 | HP Mode (Sw2= ON) HC Mode (Sw2=OFF) | Rev Valve Heat (B) HE – Fan With Heat | Rev Valve Cool (O) HG – No Fan In Heat |
| Sw4 | 2/4 pipe mode | 2 pipe mode | 4 pipe Mode |
| Sw5 | Comp Protection Delay | 5 Min Anti Cycle | Immediate Comp start |
| Sw6 | Klixon (Ricardo) Mode | On | Off |
| Sw7 | Ventilation Mode | Permitted | Not Permitted |
| Sw8 | Door Station (Optional) | Fitted | Door Station Not Used |
NOTES: The SMT-131 reads the switch settings on power-up only. If you change any DIP switch settings you must power cycle before these changes will take effect.
It is expected that only qualified people will make adjustments to these dip switch settings. Knowledge of the HVAC system under the control of the SMT-131 is essential prior to make adjustments to these DIP switch settings.
CAUTION: Incorrect adjustment of these DIP switch settings could cause HVAC equipment damage. This would NOT be covered by warranty.
Terminal Designations
The SMT-131 is powered by 24VAC and requires the 24VAC active and neutral to be connected to the “R” (active) and “C” (Neutral) terminals for the SMT-131 to function. The 24VAC applied to the SMT-131 “R” terminal is switched back through the 2A relays to the equipment. Note the drawing provided here.
CAUTION – Although the SMT-131 is a robust device, wiring errors can potentially damage the thermostat. The warranty does NOT cover this damage. Take care when wiring 24V near sensor inputs or the Modbus communications terminals.
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.
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 3×0-10V 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 temperature 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.
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 the maximum. When approaching the 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.
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.
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 the valve type to “Belimo™ Mode”. The heating 0-10v output only is used in this mode.
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).
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. The pipe sensor needed for 2 pipe mode is the RS-1d sensor – available as an optional part from Smart Temp or an authorized distributor.
The serial number or ID of a device is used to track device installation locations and details for the commissioning process. The identification information for each device should be tracked in a meaningful way, many devices include duplicate ‘stickers’ with this information. Aulani provides an iOS app to assist with the process.
For help getting started with the iOS Commissioning App please see Autani’s User Guide for the iOS Commissioning App.
Once commissioning details are collected, either through the iOS Commissioning App or by tracking identifiers on drawings/spreadsheets. Please provide this information to support@autani.com to begin the commissioning process.
Autani, LLC
7090 Columbia Gateway Drive, Suite 140
Columbia, MD 21046 USA | (443) 320-2233
www.autani.com
DOWNLOAD MANUALS:
Autani SMT-131 Wireless Digital Thermostat Quick Installation Sheet
OTHER MANUALS:
Autani SMT-131 Wireless Digital Thermostat Product Specification GUIDE
Autani SMT-131 Wireless Digital Thermostat Quick Installation Sheet
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