Indoor Environmental Quality HVAC Assessment of Dayton Oaks Elementary School: November 29th, 2022 (HXDOES20220000AC)

Assessor
Hummy Khan
Date
Outdoor Temperature
42°F
Relative Humidity
74%
Outdoor Dew Point
34°F

Air Handling Unit (Assess representative sample of RTU/AHU, including Portables)

Unit
Check OK Comments
Tag Number
Displayed
Yes
Status
Running
Yes
Outdoor Air Intake and Outdoor Air Dampers
Check OK Comments
Outdoor Pollution
Free from pollution sources w/i 25 ft. (e.g. dumpster, chimney, etc.)
Yes
Louvers and Access Doors
Operating properly
Yes
Deflectors & Screens
Present
Yes
No debris
Yes
Dampers
Outside air damper: no obstructions
Yes
Work Order Closed by Building Maintenance
Inconsistency on the position of the outside air dampers (OADs) from one unit to the other. On some units, the OADs appear to be 100% open and on others 100% closed; while on others they are partially open. For example, RTU-3 and RTU-4, OADs are 100% open, while RTU-2 is less open and RTU-1 almost 100% closed. OADs on all unit should be at minimum position based on the current outdoor air temperature. RTU-3 and RTU-4 - The OADs stay 100% open even after the units are shut down. This could cause coil freeze up. Notified HVAC controls' personnel of this concern, while on site.
Return air damper: no obstructions
Yes
Work Order Closed by Building Maintenance
RTU-3 and RTU-4 - The return air dampers (RADs) are 100% closed.
Mixing Plenum
Check OK Comments
Clean
No excess dirt, not used for storage
Yes
Work Order Closed by Building Maintenance
ERU-1 - Cardboard box with material stored inside the unit.
Insulation
Secure and Clean
Yes
P-Trap (if present)
Charged with liquid
Yes
Filters and Coils
Check OK Comments
Filters
Free of any bypassing
Yes
Correct size
Yes
Free from excessive loading, dampness or odor
Yes
Work Order Closed by Building Maintenance
On all energy recovery units (ERUs), one set of filters are installed outside the unit casing with hood on top, exposed to outdoor weather elements (humidity, moisture and sun) and no bird screen. Building Maintenance should get custom screens made and install them to protect the filters. Also, recommend to replace these set of filters every three months. On all ERUs filters installed outside the unit casing are very dirty.
Not collapsed/not fallen off
Yes
Work Order Closed by Building Maintenance
Energy recovery unit (ERU-4) - One filter had fallen off, reinstalled it back while on site.
Present (not missing)
Yes
Work Order Closed by Building Maintenance
ERU-3- One filter missing.
Date and initials written
Yes
Heating Coils
Clean, no noticeable leaks, or obstructions
Yes
Cooling Coils
Clean, no noticeable leaks, or obstructions
Yes
Access: Free of any obstructions in area that may affect access
Yes
Condensation: No excess condensation problems
Yes
Blowoff: Free of water from coil blowoff
Yes
Condensate Pan and Drain Line
No visible bacterial or fungal growth
Yes
Clean, no residue, no standing water
Yes
No Overflow, leakage, blockage, or damage
Yes
Proper slope, drain line ok, drainage acceptable, discharge okay
Yes
Work Order Closed by Building Maintenance
McQuay Rooftop Units - Condensate drain improperly terminated, repeat finding.
Fans and Motors
Check OK Comments
Condition
Operational
Yes
No unusual odors, noise, or vibration
Yes
Work Order Closed by Building Maintenance
Exhaust fan (EF-8) - Rattling, repeat finding.
Central Plant
Check OK Comments
Heating Central Plant
Boiler operational
Yes
Work Order Number(s)
264514
Issues found durring this assessment have been assigned to the above work order(s).