ASHRAE 170 Table 7-1

ASHRAE 135-2016 / Crestline BAS Specification

Crestline specifications require all building automation systems to comply with ASHRAE Standard 135-2016 (BACnet). Proprietary, closed-protocol systems lock the owner into a single vendor and prevent competitive service and integration. Open-protocol BACnet is mandatory for all new installations.

ASHRAE 15

ASHRAE 15 requires a refrigerating machinery room to be separated from the rest of the building with tight-fitting, self-closing doors. The room is designed to contain a refrigerant release and exhaust it to the outdoors. Wedging the doors open defeats the containment and lets a release migrate into occupied space.

ASHRAE 15 §9.9 (Pressure-Limiting Devices)

Head pressure of 165 psig is 40 psig above design, directly caused by the reversed condenser water piping. Watch the authority: the high-pressure cutout setting comes from ASHRAE 15 §9.9 and is referenced to the vessel design pressure, NOT to a universal number — there is no "trips at 175 psig" rule in any standard, and AHRI 550/590 is a performance-rating standard containing no safety-control provisions at all. Running this far above design costs compressor power and pushes the machine toward a nuisance high-pressure trip.

ASHRAE 170 Table 7-1 / FGI Guidelines

This passes all code requirements. ASHRAE 170 Table 7-1 specifies an OR temperature range of 68-75°F and a relative humidity range of 20-60%. The facility's 72°F and 45% RH are well within both ranges. The visible display allows the surgical team to verify conditions during procedures. The alarm capability ensures staff are notified if conditions drift out of range. The dedicated AHU with cooling, reheat, and humidification provides the three-stage control needed to simultaneously manage temperature and humidity — essential because cooling the air also removes moisture, requiring separate reheat and humidification stages.

ASHRAE 170 Table 7-1 / FGI Guidelines 2.1-3.2

This fails on multiple counts. First, ASHRAE 170 Table 7-1 requires a minimum of 12 total ACH in AII rooms — the 10 ACH provided is below the minimum. Second, AII rooms must maintain negative pressure (minimum -0.01 inches w.g.) relative to adjacent spaces, which requires the exhaust rate to exceed the supply rate — not equal it. Neutral pressure provides no directional airflow control and allows infectious aerosols to escape when doors open. Third, while HEPA filtration on the exhaust is good practice, it does not compensate for inadequate air changes or incorrect pressure relationships. The room as designed would not contain airborne pathogens.

ASHRAE 189.1 §6.3.2 (drift eliminators: 0.002% counterflow / 0.005% crossflow of recirculating water flow); CTI ATC-140 Isokinetic Drift Test Code

Damaged drift eliminators allow excessive water loss through carryover of water droplets into the discharge airstream. This wastes water and chemical treatment, and can create safety hazards from ice formation on nearby surfaces in winter. Drift loss should be limited to 0.001-0.005% of circulating flow per ASHRAE.