diff --git a/documentation/core/channel_types_reference.md b/documentation/core/channel_types_reference.md
index 39df77d..364e7c5 100644
--- a/documentation/core/channel_types_reference.md
+++ b/documentation/core/channel_types_reference.md
@@ -129,7 +129,7 @@
 ```json
 "ac_main": [10, 1]             // номер порта serial (0-3)
 // подканалы: fan (LOW/MEDIUM/HIGH), set (16-40), temp, cmd
-// также доступны подканалы lock/swing/queit/raw (/mode — число, текстовые режимы — в /cmd)
+// также доступны подканалы lock/swing/quiet/raw (/mode — число, текстовые режимы — в /cmd)
 ```
 
 ### CH_SPILED (11) - SPI LED лента
diff --git a/documentation/core/modules_description.md b/documentation/core/modules_description.md
index 6268ec2..bf61a5c 100644
--- a/documentation/core/modules_description.md
+++ b/documentation/core/modules_description.md
@@ -162,7 +162,7 @@
 | `/mode` | число (B_MODE) | Режим |
 | `/lock` | ON/OFF | Блокировка пульта |
 | `/swing` | ON/OFF | Качание жалюзей |
-| `/queit` | ON/OFF | Тихий режим (опечатка в прошивке! Статус публикуется в `/quiet`) |
+| `/quiet` | ON/OFF | Тихий режим (legacy «queit» принимается; статус публикуется в `/quiet`) |
 | `/raw` | - | Сырой кадр протокола |
 
 ---
diff --git a/documentation/core/mqtt_quick_reference.md b/documentation/core/mqtt_quick_reference.md
index b4b1f8d..66abbec 100644
--- a/documentation/core/mqtt_quick_reference.md
+++ b/documentation/core/mqtt_quick_reference.md
@@ -129,8 +129,8 @@ mosquitto_pub -h 192.168.1.100 -t "myhome/in/ac_main/fan" -m "HIGH"
 # Направление воздуха (ON, OFF)
 mosquitto_pub -h 192.168.1.100 -t "myhome/in/ac_main/swing" -m "ON"
 
-# Тихий режим (входной subitem «queit» — опечатка в прошивке; статус — /quiet)
-mosquitto_pub -h 192.168.1.100 -t "myhome/in/ac_main/queit" -m "ON"
+# Тихий режим (legacy «queit» также принимается; статус — /quiet)
+mosquitto_pub -h 192.168.1.100 -t "myhome/in/ac_main/quiet" -m "ON"
 
 # Блокировка ПДУ
 mosquitto_pub -h 192.168.1.100 -t "myhome/in/ac_main/lock" -m "ON"
diff --git a/documentation/core/suffixes_reference.md b/documentation/core/suffixes_reference.md
index dceaa4e..d13002e 100644
--- a/documentation/core/suffixes_reference.md
+++ b/documentation/core/suffixes_reference.md
@@ -77,7 +77,7 @@ myhome/in/rgb_light → 240,100,200
 | `/fan` | ✅ | ✅ | Скорость вентилятора | LOW, MEDIUM, HIGH, OFF или число |
 | `/lock` | ✅ | ✅ | Блокировка ПДУ | ON, OFF |
 | `/swing` | ✅ | ✅ | Направление воздушного потока | ON, OFF |
-| `/quiet` | ✅ | ✅ | Режим "тихой работы". Входной subitem — «queit» (опечатка в прошивке); статус публикуется в `/quiet` | ON, OFF |
+| `/quiet` | ✅ | ✅ | Режим "тихой работы". Входной subitem — `/quiet` (legacy «queit» принимается); статус публикуется в `/quiet` | ON, OFF |
 
 **Примеры**:
 ```
@@ -93,8 +93,8 @@ myhome/in/ac_main/set → 22
 # Максимальная скорость вентилятора
 myhome/in/ac_main/fan → HIGH
 
-# Включить тихий режим (входной subitem «queit» — опечатка в прошивке)
-myhome/in/ac_main/queit → ON
+# Включить тихий режим (legacy «queit» также принимается)
+myhome/in/ac_main/quiet → ON
 ```
 
 **Логика срабатывания AC**:
@@ -237,7 +237,7 @@ myhome/in/ac/HEAT/set → 25
 | 7 | CH_GROUP | `/cmd`, `/set`, `/hue`, `/sat`, `/HSV` | Группа каналов |
 | 8 | CH_VCTEMP | — | Регулятор Vacon (PID) |
 | 9 | CH_VC | — | Привод Vacon (Modbus) |
-| 10 | CH_AC (Haier) | `/cmd`, `/set` (16-40), `/mode` (0-4), `/fan`, `/lock`, `/swing`, `/queit` (статус `/quiet`), `/temp`, `/raw` | Кондиционер |
+| 10 | CH_AC (Haier) | `/cmd`, `/set` (16-40), `/mode` (0-4), `/fan`, `/lock`, `/swing`, `/quiet` (legacy `queit`), `/temp`, `/raw` | Кондиционер |
 | 11 | CH_SPILED | `/cmd`, `/set`, `/hue`, `/sat`, `/HSV` + subitem-пиксели 10-20 | Адресуемая LED лента |
 | 12 | CH_MOTOR | `/cmd`, `/set` | Сервопривод |
 | 13 | CH_PID | `/cmd`, `/set`, `/val` (вход сенсора), `/ctrl` | PID регулятор, теплые полы |
@@ -430,7 +430,7 @@ myhome/s_out/rgb_lamp/cmd → ON
 /fan → HIGH                Максимальная скорость вентилятора
 /lock → ON                 Заблокировать ПДУ (только кондиционер)
 /swing → ON                Включить направление воздуха
-/queit → ON                Тихий режим (опечатка в прошивке; статус — /quiet)
+/quiet → ON              Тихий режим (legacy «queit» принимается; статус — /quiet)
 ```
 
 ---
diff --git a/lighthub/modules/out_ac.cpp b/lighthub/modules/out_ac.cpp
index fab4fcb..76404a8 100644
--- a/lighthub/modules/out_ac.cpp
+++ b/lighthub/modules/out_ac.cpp
@@ -35,7 +35,8 @@ byte lock[] = {255,255,10,0,0,0,0,0,1,3,0,0,14};  // Блокировка пул
 
 //Extended subItem set
 const char LOCK_P[]   PROGMEM = "lock";
-const char QUIET_P[]  PROGMEM = "queit";
+const char QUIET_P[]  PROGMEM = "quiet";
+const char QUIET_LEGACY_P[] PROGMEM = "queit"; // legacy typo, kept for backward compatibility
 const char SWING_P[]  PROGMEM = "swing";
 const char RAW_P[]    PROGMEM = "raw";
 
@@ -503,7 +504,7 @@ int out_AC::Ctrl(itemCmd cmd,  char* subItem , bool toExecute, bool authorized)
  // Some additional Subitems
        if (strcmp_P(subItem, LOCK_P) == 0) suffixCode = S_LOCK;
   else if (strcmp_P(subItem, SWING_P) == 0) suffixCode = S_SWING;
-  else if (strcmp_P(subItem, QUIET_P) == 0) suffixCode = S_QUIET;
+   else if (strcmp_P(subItem, QUIET_P) == 0 || strcmp_P(subItem, QUIET_LEGACY_P) == 0) suffixCode = S_QUIET;
   else if (strcmp_P(subItem, RAW_P) == 0) suffixCode = S_RAW;
 
   if (cmd.isCommand() && !suffixCode && !subItem) suffixCode=S_CMD; //if some known command find, but w/o correct suffix - got it
diff --git a/lighthub/modules/out_ac.h b/lighthub/modules/out_ac.h
index 1535d34..a39d817 100644
--- a/lighthub/modules/out_ac.h
+++ b/lighthub/modules/out_ac.h
@@ -5,6 +5,7 @@
 #include <item.h>
 #include "itemCmd.h"
 
+/** @brief Byte length of the AC status frame. */
 #define LEN_B   37
 #define B_CUR_TMP   13  //Текущая температура
 #define B_CMD       17  // 00-команда 7F-ответ ???
@@ -16,6 +17,7 @@
 #define B_FRESH     31  //fresh 00 - off, 01 - on
 #define B_SET_TMP   35  //Установленная температура
 
+/** Additional suffix codes (beyond the standard suffix_P table). */
 #define S_LOCK S_ADDITIONAL+1
 #define S_QUIET S_ADDITIONAL+2
 #define S_SWING S_ADDITIONAL+3
@@ -23,6 +25,13 @@
 
 extern void modbusIdle(void) ;
 
+/**
+ * @brief Persistent per-item state of an AC channel, stored in the config tree.
+ *
+ * Holds the last 37-byte status frame received from the AC, decoded power
+ * and mode bytes, the last frame CRC value (inCheck, used to detect
+ * updates) and a timestamp of the last transmission.
+ */
 class acPersistent : public chPersistent  {
 public:
   byte data[37];
@@ -32,19 +41,52 @@ public:
   uint32_t timestamp;
 };
 
+/**
+ * @brief Air conditioner driver (Haier IR-over-UART protocol), channel type CH_AC = 10.
+ *
+ * Talks to a Haier AC over UART at 9600 baud using 13-byte request frames
+ * and 37-byte status frames (frame check = sum of bytes). Periodically
+ * polls the AC unit and applies control commands.
+ *
+ * JSON config (itemArg): [portNum(0-3), callbacksObj]
+ *  - portNum: 0 = default port (Serial3, or USB-CDC Serial), 1..3 = Serial1..Serial3;
+ *  - callbacksObj (optional): object with keys "fan", "set", "cmd", "temp"
+ *    holding execution objects invoked on every polled status update.
+ *
+ * Ctrl commands:
+ *  - /set 16-40 - set temperature;
+ *  - /cmd - AUTO / HEAT / COOL / FAN_ONLY / DRY, plus ON / OFF;
+ *  - /fan - LOW / MEDIUM / HIGH / AUTO / OFF, or a 0-255 value;
+ *  - /mode <number> - raw mode code;
+  *  - subitems: "lock" ON/OFF, "swing" ON/OFF, "quiet" ON/OFF (legacy
+  *    "queit" accepted for backward compatibility), "raw".
+ *
+ * Published status topics: /set, /temp, /mode, /cmd, /fan, /fresh, /lock,
+ * /quiet, /compressor, /swing.
+ */
 class out_AC : public abstractOut {
 public:
 
+    /** @brief Default constructor; binds nothing until link() is called. */
     out_AC():store(NULL),portNum(0),ACSerial(NULL){};
+    /** @brief Links the channel item, attaches persistent storage and reads the config. */
     void link(Item * _item){abstractOut::link(_item); if (_item) {store = (acPersistent *) item->getPersistent(); getConfig();} else store = NULL;};
+    /** @brief Reads itemArg and selects the UART port (0-3) for the AC line. */
     void getConfig();
+    /** @brief Initializes persistent storage and starts the UART at 9600 baud. */
     int Setup() override;
+    /** @brief Polls the AC every 5 s, parses the 37-byte status frame and publishes the status topics. */
     int Poll(short cause) override;
+    /** @brief Releases the persistent storage and marks the channel as unknown. */
     int Stop() override;
+    /** @brief Returns 1 if the AC power bit is set, 0 otherwise. */
     int isActive() override;
+    /** @brief Returns CH_THERMO (5). */
     int getChanType() override;
    // int getDefaultStorageType(){return ST_FLOAT_CELSIUS;};
+    /** @brief Applies a control command: /set, /cmd, /fan, /mode, and lock/swing/quiet/raw subitems (see class doc). */
     int Ctrl(itemCmd cmd,  char* subItem=NULL, bool toExecute=true, bool authorized = false) override;
+    /** @brief Invokes the named callback object ("fan"/"set"/"cmd"/"temp") from itemArg with a polled value. */
     void SubmitParameters(const char * name, itemCmd value);
     
 protected: