SLAAEQ2 September   2024 MSPM0C1105 , MSPM0C1106 , MSPM0G1106 , MSPM0G1107 , MSPM0G1506 , MSPM0G1507 , MSPM0G1518 , MSPM0G1519 , MSPM0G3106 , MSPM0G3106-Q1 , MSPM0G3107 , MSPM0G3107-Q1 , MSPM0G3506 , MSPM0G3506-Q1 , MSPM0G3507 , MSPM0G3507-Q1 , MSPM0G3518 , MSPM0G3518-Q1 , MSPM0G3519 , MSPM0G3519-Q1 , MSPM0H3216

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Example Mitigation Control Board Design
    1. 2.1 Overview of Mitigation Board Functions
    2. 2.2 Audible and Visible Detection Alarm
    3. 2.3 Freeze Detection (Water-Based Systems)
    4. 2.4 Isolation and or Safety Shut-off Valves (SSOVs) in the Refrigeration System to Limit Releasable Charge
    5. 2.5 Electronic Controls With A2L Logic to Perform Required Actions in The Event of a Leak — Such as Shutting off the Compressor and or Other Components
    6. 2.6 Ventilation and or Circulation Fans Within Cases or Walk-in Units
  6. 3Summary
  7. 4References

2.3 Freeze Detection (Water-Based Systems)

For systems with a secondary heat exchanger (air-to-water, water to water, chillers), the heat exchanger shall not allow the release of refrigerant into areas served by the secondary heat exchanger fluids by implementing one or more of the following:

  • Double wall heat exchanger
  • Refrigerant system where the pressure of secondary circuit is always greater than that of the primary circuit in area of contact
  • Implementation of a freeze protection device where:
    • Circulation pump is switched off
    • Freeze protection shuts off compressor
    • Depending on application, Safety shut off valves with spring return for electrical power failure safety

TI collateral for designers: Low-Power Flood and Freeze Detector Reference Design with Sub-1 GHz and 10-Year Coin Cell Battery Life.

Design Overview: This reference design uses Texas Instruments low-power consumption digital dual temperature and humidity sensors and the SimpleLink™ ultra-low power Sub-1 GHz wireless microcontroller (MCU) platform to demonstrate a flood and freeze detector with extremely long battery life and no wiring required.

TIDA-01518 Reference Design Block Diagram Figure 2-10 TIDA-01518 Reference Design Block Diagram

Features:

  • Ultra-low-power design resulting in 10-year battery life from single CR2032 coin cell
  • Conductive water sensing always powered on to enable continuous monitoring
  • Designed for SimpleLink™ Sub-1 GH CC1310 wireless microcontroller (MCU) LaunchPad™ development kit (LAUNCHXL-CC1310)
  • Ability to take high-resolution temperature and humidity data
  • Simple design that leads to lower cost