19-7_Update

docs/section19/Rule19-7.md

@@ -78,7 +78,7 @@ Exceptions included in this RDS:
 
         - **Rule Assertion:** 
         - Case 1: If the modeled baseline and proposed minimum OA cfm values are identical (OA CFM values match all hours of the year) and hvac_system_serves_only_labs == false then pass: `if OA_CFM_schedule_match == true and hvac_system_serves_only_labs == false: outcome = "PASS"`  
-        - Case 2: Elif the modeled baseline and proposed minimum OA cfm values are identical (OA CFM values match all hours of the year) and some space types are labs but not all space types are defined then pass: `elif OA_CFM_schedule_match == true and (hvac_system_serves_only_labs == true and are_any_lighting_space_types_defined == true): outcome = "PASS" and raise_message "<insert hvac.id> passes this check unless it only serves labs. This hvac system serves some labs but it could not be determined from the RMD if it only serves labs. Outcome is UNDETERMINED if the HVAC system only serves lab spaces due to G3.1.2.5 Exception 4."`  
+        - Case 2: Elif the modeled baseline and proposed minimum OA cfm values are identical (OA CFM values match all hours of the year) and some space types are labs but not all space types are defined then undetermined: `elif OA_CFM_schedule_match == true and (hvac_system_serves_only_labs == true and are_any_lighting_space_types_defined == true): outcome = "UNDETERMINED" and raise_message "<insert hvac.id> passes this check unless it only serves labs. This hvac system serves some labs but it could not be determined from the RMD if it only serves labs. Conduct manual check if the HVAC system only serves lab spaces due to G3.1.2.5 Exception 4."`  
         - Case 3: Elif the modeled baseline and proposed minimum OA cfm values are identical (OA CFM values match all hours of the year) and and all space types are undefined then pass: `elif OA_CFM_schedule_match == true and are_any_lighting_space_types_defined == false: outcome = "PASS" and raise_message "<insert hvac.id> passes this check unless it only serves lab spaces (no space types were defined in the RMD so this could not be determined). Outcome is UNDETERMINED if the HVAC system only serves lab spaces due to G3.1.2.5 Exception 4."`  
         - Case 4: Else if the modeled baseline minimum OA cfm are greater than the modeled proposed minimum OA cfm and a zone served by the HVAC in the baseline has demand controlled ventilation modeled in the proposed (Exception 1) and the hvac system does not only serve labs then the outcome is Fail: `elif modeled_baseline_total_zone_min_OA_CFM > modeled_proposed_total_zone_min_OA_CFM and was_DCV_modeled_baseline == false and was_DCV_modeled_proposed == true and zone_air_distribution_effectiveness_greater_than_1 == false and hvac_system_serves_only_labs == false: outome = "FAIL" and raise_message "For <insert hvac.id> the baseline modeled minimum ventilation system outdoor air intake flow CFM is higher than the minimum ventilation system outdoor air intake flow CFM modeled in the proposed design. Demand-controlled ventilation was modeled in the proposed and not the baseline model and demand-controlled ventilation may be double accounted for in the model (per the HVAC controls and via reduced OA CFM rates in the proposed)."`  
         - Case 5: Else if the modeled baseline minimum OA cfm are greater than the modeled proposed minimum OA cfm and a zone served by the HVAC in the baseline has demand controlled ventilation modeled in the proposed (Exception 1) and it is unknown if the hvac system only serve labs then the outcome is Fail: `elif modeled_baseline_total_zone_min_OA_CFM > modeled_proposed_total_zone_min_OA_CFM and was_DCV_modeled_baseline == false and was_DCV_modeled_proposed == true and zone_air_distribution_effectiveness_greater_than_1 == false: outome = "FAIL" and raise_message "For <insert hvac.id> the baseline modeled minimum ventilation system outdoor air intake flow CFM is higher than the minimum ventilation system outdoor air intake flow CFM modeled in the proposed design. Demand-controlled ventilation was modeled in the proposed and not the baseline model and demand-controlled ventilation may be double accounted for in the model (per the HVAC controls and via reduced OA CFM rates in the proposed). Alternatively, the hvac system may only serve labs in which case G3.1.2.5 Exception 4 may be applicable and leading to allowed higher modeled rates in the baseline."`