diff --git a/ontology/yaml/resources/HVAC/entity_types/ABSTRACT.yaml b/ontology/yaml/resources/HVAC/entity_types/ABSTRACT.yaml
index 6e981df92..b4221e7b1 100644
--- a/ontology/yaml/resources/HVAC/entity_types/ABSTRACT.yaml
+++ b/ontology/yaml/resources/HVAC/entity_types/ABSTRACT.yaml
@@ -334,6 +334,7 @@ CO2C:
   opt_uses:
   - high_zone_air_co2_concentration_alarm
   - failed_zone_air_co2_concentration_alarm
+  - zone_air_co2_deadband_concentration_setpoint
 
 
 CO2CMAX:
diff --git a/ontology/yaml/resources/HVAC/entity_types/VAV.yaml b/ontology/yaml/resources/HVAC/entity_types/VAV.yaml
index 8f0245e53..f1c033875 100644
--- a/ontology/yaml/resources/HVAC/entity_types/VAV.yaml
+++ b/ontology/yaml/resources/HVAC/entity_types/VAV.yaml
@@ -56,6 +56,16 @@ VAV_SD_HLSAFS:
   - SD
   - HLSAFS
 
+VAV_SD_HLSAFS_CO2C:
+  guid: "d9619dab-e8e8-4703-9d80-16eaad50a75e"
+  description: "Single duct VAV with CO2 concentration control."
+  is_canonical: true
+  implements:
+  - VAV
+  - SD
+  - HLSAFS
+  - CO2C
+
 VAV_SD_CSP_HLSAFS:
   guid: "ea3a576a-08af-40b2-ae0b-59451e0b88a4"
   description: "Simple cooling only VAV with occupancy."
diff --git a/ontology/yaml/resources/fields/telemetry_fields.yaml b/ontology/yaml/resources/fields/telemetry_fields.yaml
index 28b3670da..6fdea9f20 100644
--- a/ontology/yaml/resources/fields/telemetry_fields.yaml
+++ b/ontology/yaml/resources/fields/telemetry_fields.yaml
@@ -517,6 +517,9 @@ literals:
 - zone_air_co2_concentration_setpoint:
     flexible_min: 0.00005
     flexible_max: 0.005
+- zone_air_co2_deadband_concentration_setpoint:
+    flexible_min: 0.00005
+    flexible_max: 0.005
 - max_zone_air_co2_concentration_sensor:
     flexible_min: 0.00005
     flexible_max: 0.005