add NAC AP470 Air Purifier

custom_components/tuya_local/devices/nac_ap470_purifier.yaml

@@ -127,13 +127,13 @@ secondary_entities:
         mapping:
           - dps_val: cancle
             value: "Off"
-          - dps_val: 2h
-            value: "2"
-          - dps_val: 4h
-            value: "4"
-          - dps_val: 6h
+          - dps_val: 2
+            value: "2 hours"
+          - dps_val: 4
+            value: "4 hours"
+          - dps_val: 6
             value: "6 hours"
-          - dps_val: 8h
+          - dps_val: 8
             value: "8 hours"
   - entity: sensor
     name: Timer time left