# Water Tank 2.1 (WT 2.1)
Enapter’s Water Tank 2.1 provides storage for 38 liters of clean water for the AEM electrolyser. The water tank is rack mountable into a standard 19” cabinet. The tank contains a conductivity sensor and a pump system to supply up to 9 AEM electrolysers with clean water.
# 📖 Resources
|Datasheets||Owner's Manuals||Quick Start Guides|
# 📸 Images
# 🚦 Status LEDs Indications
|Power on||The device will turn on as soon as the required input voltage is supplied to the WT 2.1; then, it performs a start-up self-check.||Red, yellow & green blink thrice|
|First Tank Refilling||At the first refilling, the machine will cross the "very low water level," "low water level," and the "waiting for water" warnings before to go on an optimal operating condition.||Yellow & green blink sequentially|
|Feeding||The device is ready to refill downstream devices: the pump is ON and the solenoid valve is closed.||Green blinks|
|Refilling||The solenoid valve is open for tank refilling.||Green steady|
|Warning||The system will partially continue to work. The warning can be reported using remote monitoring and resolved automatically by the system. The heads-up event which should be taken into account to avoid Error or Fatal Error.||Yellow blinks|
|Error||The system stops. Remote monitoring will report Errors. These can be resolved by the system or by contacting the Enapter Support.||Red blinks slow|
|Fatal Error||The system stops. Unrecoverable error: hardware repair is required.||Red blinks fast|
# 📈 Remote Monitoring and Control
Water Tank 2.1 comes with pre-installed UCM (Universal Communication Module) that allows users to monitor the device. Over-the-air updates ensure that the latest protocols and security fixes are supported.
Pre-installed UCM connects to the Enapter Gateway and send performance and error data to the Enapter Cloud. The data is stored in a time series database which displays it real-time on customizable dashboards.
Enapter’s mobile application ensures quick and easy installation of any energy system. Users can manage the Water Tank 2.1 via the mobile app and will receive push notifications to warn of energy system issues.
# Network Requirements
# WI-Fi Requirements
802.11a/b/g/n (2.4 GHz only)
802.12 WEP, WPA, WPA2 Personal (Pre-shared key)
Wi-Fi client isolation must be disabled
No captive portal or WPA2 Enterprise supported.
General Wi-Fi Note
The Enapter Cloud connection based on wireless communication and therefore the functionality can be affected with distance in between devices, obstructions between the devices and interference. Communication module inside the Water Tank 2.1 works in station mode and utilizes Wi-Fi channel set in your infrastructure Wi-Fi router for used SSID. You are responsible to select the correct channel according to the local radio regulations.
# Connecting your Water Tank 2.1 to Wi-Fi
To connect the Water Tank 2.1 to wireless networks, follow the steps in the iOS or Android Mobile Application guides below. Please note, the QR-code or preinstalled UCM's ID and PIN are required when connecting to Wi-Fi as well as credentials for the 2,4 GHz Wi-Fi network.
During connection to Wi-Fi network the QR-code or preinstalled UCM's ID and PIN needed. The location for both of them is shown on pictures below.
# ⚠️ Events
# Severity Levels
|Code||Severity Level||LED Indication||Description||Comment|
|F||Fatal Error||Red blinks fast||System stopped. Unrecoverable error. Hardware repair required.||e.g. Level sensor is not connected or broken.|
|E||Error||Red blinks slow||System Stopped. Recoverable error.||e.g. No input water pressure and internal water tank is empty.|
|W||Warning||Yellow blinks||Heads-up event which should be taken into account to avoid Error or Fatal Error.||e.g. No input water pressure and internal water tank is full.|
# Warning, Error and Fatal Error Codes
The Code and Name marked in bold are introduced in current release of firmware.
|Name||Severity Code||Routine Code||Component||Condition||Description|
|WL_1||W||L||CT01||Conductivity > 20µS||BAD QUALITY WATER INPUT|
|WL_2||W||L||LT01||Liters <= 8.55L||LOW WATER LEVEL|
|WL_3||W||L||LT01||8.55L < Voltage <= 23.7L||WAITING FOR WATER|
|WS_1||W||S||TT01||Temperature > 45 °С||HIGH WATER INLET TEMPERATURE|
|WS_2||W||S||TT01||Temperature < 1 °С||LOW WATER INLET TEMPERATURE|
|WS_3||W||S||LSL||Water level below level switch||VERY LOW WATER LEVEL|
|WS_4||W||S||LSH||Water level over the level switch||VERY HIGH WATER LEVEL|
|EL_1||E||L||--||Refilling timeout||TANK REFILLING ISSUE|
|ES_1||E||S||TT02||Temperature < 1 °С||LOW WATER TANK TEMPERATURE|
|ES_2||E||S||SV01||When the SV01 is closed, the water level has risen above the permissible value||VALVE LEAK|
|FS_1||F||S||WPS01||Water sensor is wet||WATER LEAK|
|FS_2||F||S||TT02||Voltage at the TT02 < 88mV||TANK TEMPERATURE SENSOR BROKEN|
|FS_3||F||S||TT01||Voltage at the TT01 < 88mV||INLET TEMPERATURE SENSOR BROKEN|
|FS_4||F||S||LT01||Low voltage on the LT01 when the water level is higher than the LSL sensor||WATER LEVEL SENSOR BROKEN|
|FS_5||F||S||CS01||Current sensor reference value < 2.4V||CURRENT SENSOR BROKEN|
|FS_6||F||S||P01||Current consumption > 1.3 A||PUMP BROKEN|