# Instance: 2.4 + 3.5.1 — BMS HVAC Field Devices

Module: [bms/field-devices-hvac](../../../_playbook/modules/bms/field-devices-hvac.md)
WBS leaves: 2.4 (supply), 3.5.1 (installation)

## Project-specific values

- **HVAC equipment instances served (per A2):** 41 instances — chillers (2), CHW pumps (3), CW pumps (3), CHW headers + bypass + CW header (4), BTU meter (1), cooling towers (2 + common), AHUs (7), DOAS (3), PAHU (3), exhaust fans (9), ozone (1) and casino-spec AHUs (2).
- **Field instrumentation owned by BMS Contractor (per C1):**
  - **Temperature sensors:** ~45 (chiller water entering/leaving, header T, BTU supply/return, AHU/DOAS supply/mixed/return, exhaust)
  - **Humidity sensors:** ~10 (DOAS/AHU mixed + supply)
  - **Pressure sensors:** ~6 (CHW supply + steam supply)
  - **Differential-pressure sensors:** 1 (CHW bypass)
  - **Flow sensors:** ~6 (CHW supply/return, CW supply, DOAS/PAHU outdoor flow)
  - **CO₂ / CO sensors:** ~5 (AHU return air)
  - **Level sensors / electrodes:** 2 (CT basin)
  - **VOC sensor:** 1 (Casino ozone)
  - **Oxygen sensor:** 2 (boiler fluegas — note: some on BMS-01 are BMS-supplied, some Equipment Supplier)
- **Equipment Supplier-supplied:** aux contacts for status/HOA/trip on all motorized equipment, VFD parameters, chiller-native BACnet HLI gateway, DOAS native BACnet/IP controller (per C/O column).
- **ME-supplied:** dampers, valve actuators (CHWS/COW isolation, blowdown valves), power feeds.

## Quantities driving BOQ

- BMS-side sensor counts per A2 takeoff (`primary_co=BMS Contractor`).
- Cable per A3 to each HVAC equipment instance.
- Manhours per B4 — ~310 hr field-device installation.