Standards.AirLoopHVAC.rb in openstudio-standards-0.2.9

- old
+ new

@@ -3078,31 +3078,14 @@
     end
 
     return sp_reset_required
   end
 
-  # Determine if a system's fans must shut off when
-  # not required.
-  #
+  # Determine if a system's fans must shut off when not required.
+  # Per ASHRAE 90.1 section 6.4.3.3, HVAC systems are required to have off-hour controls
   # @return [Bool] true if required, false if not
   def air_loop_hvac_unoccupied_fan_shutoff_required?(air_loop_hvac)
     shutoff_required = true
-
-    # Per 90.1 6.4.3.4.5, systems less than 0.75 HP
-    # must turn off when unoccupied.
-    minimum_fan_hp = 0.75
-
-    # Determine the system fan horsepower
-    total_hp = 0.0
-    air_loop_hvac_supply_return_exhaust_relief_fans(air_loop_hvac).each do |fan|
-      total_hp += fan_motor_horsepower(fan)
-    end
-
-    # Check the HP exception
-    if total_hp < minimum_fan_hp
-      shutoff_required = false
-      OpenStudio.logFree(OpenStudio::Info, 'openstudio.standards.AirLoopHVAC', "For #{air_loop_hvac.name}: Unoccupied fan shutoff not required because system fan HP of #{total_hp.round(2)} HP is less than the minimum threshold of #{minimum_fan_hp} HP.")
-    end
 
     return shutoff_required
   end
 
   # Shut off the system during unoccupied periods.