Add auto-on when receiver is on for rack3.

rack_3.yaml

@@ -6,6 +6,7 @@ substitutions:
   duct_fan_pwmfreq: 5000Hz
   duct_fan_off_spd: "0.0"
   duct_fan_lo_spd: "1.0"
+  duct_fan_amppwr_on_lo_spd: "20.0"
   duct_fan_hi_spd: "100.0"
   amppwr_pin: GPIO19
   amppwr_name: "Denon Pwr"
@@ -17,13 +18,16 @@ substitutions:
   dallas_update_interval: 30s
 
 globals:
-  - id: duct_fan_off_spd
+  - id: duct_fan_off_spd_id
     type: float
     initial_value: ${duct_fan_off_spd}
-  - id: duct_fan_lo_spd
+  - id: duct_fan_lo_spd_id
     type: float
     initial_value: ${duct_fan_lo_spd}
-  - id: duct_fan_hi_spd
+  - id: duct_fan_amppwr_on_lo_spd_id
+    type: float
+    initial_value: ${duct_fan_amppwr_on_lo_spd}
+  - id: duct_fan_hi_spd_id
     type: float
     initial_value: ${duct_fan_hi_spd}
 
@@ -116,16 +120,22 @@ number:
       lo_temp = id(thermostat_out_id).target_temperature_low;
       hi_temp = id(thermostat_out_id).target_temperature_high;
       curtemp = id(dallas_out_id).state;
-      off_spd = id(duct_fan_off_spd);
-      lo_spd = id(duct_fan_lo_spd);
-      hi_spd = id(duct_fan_hi_spd);
-      if ((curtemp < lo_temp) || (id(thermostat_on_id).state == false)) {
+      off_spd = id(duct_fan_off_spd_id);
+      hi_spd = id(duct_fan_hi_spd_id);
+      lo_spd = id(duct_fan_lo_spd_id);
+      if (id(amppwr_id).state == true) {
+        // Amp is on, use that lo speed.
+        lo_spd = id(duct_fan_amppwr_on_lo_spd_id);
+      } else if ((curtemp < lo_temp) || (id(thermostat_on_id).state == false)) {
+        // Amp is off and temp is lo or thermostat is off. Turn the fan off.
         auto call = id(duct_fan_spd_id).turn_off();
         call.perform();
         return off_spd;
       }
       if (curtemp > hi_temp) {
         newspd = hi_spd;
+      } else if (curtemp < lo_temp) {
+        newspd = lo_spd;
       } else {
         // Set newspd to same linear proportion of spd range as current temp is of temp range
         newspd = lo_spd + ((hi_spd - lo_spd) * (curtemp - lo_temp) / (hi_temp - lo_temp));
@@ -167,6 +177,7 @@ climate:
 # Sense when receiver is turned on
 binary_sensor:
   - platform: gpio
+    id: amppwr_id
     pin: ${amppwr_pin}
     name: ${amppwr_name}
     device_class: power