Technical Trade SchoolBAS-300 service-series
BAS-310
Concept reading and source route

BAS-310 Reading Guide

How to use this reading guide

This is the concept-review layer for a 100% online course. Read each module before its lesson, complete the retrieval prompts without looking, then use the linked authoritative sources to verify project-specific editions, requirements, and manufacturer procedures.

Online evidence is not OJL: browser simulations, document cases, and isolated remote equipment build reasoning and documentation skill; supervised field performance is recorded separately.

Module 1

IAQ complaint contract and urgent escalation

Why it matters: The BAS technician organizes evidence and system response; the technician does not diagnose illness or certify safety.

Vocabulary and working scope

Occupants; symptoms/odor description; locations; timing; activities; weather; recent work; emergency signs; medical/industrial-hygiene/environmental/fire/facility roles.

Source-to-result trace

  1. Locate the controlling requirement and establish authority.
  2. Identify the physical and digital boundaries.
  3. Preserve as-found state and timestamps.
  4. Trace the initiating condition through logic, interfaces, equipment, and process response.
  5. Compare expected and actual evidence.
  6. Calculate with units and stated tolerance.
  7. Record action, result, restoration, uncertainty, and owner.

Worked thinking prompt

Several occupants report dizziness after a chemical spill odor appears near an air intake.

Calculation: Count affected locations/times only as descriptive evidence; do not convert reports into exposure dose or medical conclusions.

Retrieval prompts

Module 2

Source, pathway, receptor, and IAQ limits

Why it matters: No single BAS sensor is an IAQ meter, and acceptable temperature does not prove acceptable IAQ.

Vocabulary and working scope

Particles; gases; odors; moisture; biological-growth conditions; source strength; pathway; pressure; receptor; concentration/exposure concepts; comfort versus health; uncertainty.

Source-to-result trace

  1. Locate the controlling requirement and establish authority.
  2. Identify the physical and digital boundaries.
  3. Preserve as-found state and timestamps.
  4. Trace the initiating condition through logic, interfaces, equipment, and process response.
  5. Compare expected and actual evidence.
  6. Calculate with units and stated tolerance.
  7. Record action, result, restoration, uncertainty, and owner.

Worked thinking prompt

An odor appears only when a nearby exhaust fan and certain wind direction coincide.

Calculation: Build a source-pathway-time matrix and compare coincident events without claiming causation beyond evidence.

Retrieval prompts

Module 3

Ventilation path and governing authority

Why it matters: Ventilation quantity comes from applicable project/adopted criteria and verified system evidence, not a guessed universal value.

Vocabulary and working scope

Intake; louver; damper; filter; coil; fan; mixing; distribution; terminal; relief/return/exhaust; occupied/emergency modes; design criteria; adopted edition; project sequence.

Source-to-result trace

  1. Locate the controlling requirement and establish authority.
  2. Identify the physical and digital boundaries.
  3. Preserve as-found state and timestamps.
  4. Trace the initiating condition through logic, interfaces, equipment, and process response.
  5. Compare expected and actual evidence.
  6. Calculate with units and stated tolerance.
  7. Record action, result, restoration, uncertainty, and owner.

Worked thinking prompt

The outdoor-air damper command is open but the intake is blocked by construction material.

Calculation: Reconcile design, scheduled, TAB, controller, and current evidence values with units and source identity.

Retrieval prompts

Module 4

Outdoor airflow, occupancy, and DCV

Why it matters: DCV may reset ventilation within its approved method; it does not permit ventilation below applicable minimum or replace source control.

Vocabulary and working scope

Zone/system outdoor airflow; occupancy category/density; diversity; ventilation efficiency awareness; schedules; DCV sensor; minimum; reset; limits; air-cleaning assumptions.

Source-to-result trace

  1. Locate the controlling requirement and establish authority.
  2. Identify the physical and digital boundaries.
  3. Preserve as-found state and timestamps.
  4. Trace the initiating condition through logic, interfaces, equipment, and process response.
  5. Compare expected and actual evidence.
  6. Calculate with units and stated tolerance.
  7. Record action, result, restoration, uncertainty, and owner.

Worked thinking prompt

A conference room CO2 rises during use, but the system outdoor-air flow station is stale.

Calculation: Calculate supplied zone/system outdoor airflow and compare scheduled, design, TAB, and controller values; state uncertainty.

Retrieval prompts

Module 5

CO2 evidence and limitations

Why it matters: CO2 can support a ventilation investigation when occupancy, outdoor reference, sensor quality, and system mode are known.

Vocabulary and working scope

Generation/dilution concept; indoor/outdoor differential; occupancy; lag; placement; calibration; outdoor reference; trend; DCV; proxy limitations; no health threshold claims.

Source-to-result trace

  1. Locate the controlling requirement and establish authority.
  2. Identify the physical and digital boundaries.
  3. Preserve as-found state and timestamps.
  4. Trace the initiating condition through logic, interfaces, equipment, and process response.
  5. Compare expected and actual evidence.
  6. Calculate with units and stated tolerance.
  7. Record action, result, restoration, uncertainty, and owner.

Worked thinking prompt

CO2 is high in one room while adjacent rooms with the same air system remain normal.

Calculation: Calculate indoor-outdoor differential, rate of rise/decay, lag, and data age without inferring total IAQ or health safety.

Retrieval prompts

Module 6

Humidity, dew point, and moisture pathways

Why it matters: RH changes with temperature; dew point and humidity ratio help separate moisture content from temperature effect.

Vocabulary and working scope

RH; humidity ratio; dew point; surface temperature; infiltration; latent load; humidification/dehumidification; drain/condensation; seasonal operation; building materials.

Source-to-result trace

  1. Locate the controlling requirement and establish authority.
  2. Identify the physical and digital boundaries.
  3. Preserve as-found state and timestamps.
  4. Trace the initiating condition through logic, interfaces, equipment, and process response.
  5. Compare expected and actual evidence.
  6. Calculate with units and stated tolerance.
  7. Record action, result, restoration, uncertainty, and owner.

Worked thinking prompt

A cold supply diffuser sweats during humid weather while space RH appears moderate.

Calculation: Calculate dew point, humidity ratio, and margin between surface temperature and dew point using approved tools/data.

Retrieval prompts

Module 7

Building pressure, exhaust, and smoke-control boundary

Why it matters: A normal HVAC pressure strategy must not be used to test, override, or reinterpret smoke-control or regulated-space requirements.

Vocabulary and working scope

Supply/return/exhaust/transfer balance; stack; wind; doors; negative/positive spaces; makeup air; lab/healthcare awareness; smoke-control priority; no manipulation.

Source-to-result trace

  1. Locate the controlling requirement and establish authority.
  2. Identify the physical and digital boundaries.
  3. Preserve as-found state and timestamps.
  4. Trace the initiating condition through logic, interfaces, equipment, and process response.
  5. Compare expected and actual evidence.
  6. Calculate with units and stated tolerance.
  7. Record action, result, restoration, uncertainty, and owner.

Worked thinking prompt

A lobby door is difficult to open when multiple exhaust systems run on a cold windy day.

Calculation: Calculate supplied air-balance difference and interpret differential-pressure sign/reference with wind and door context.

Retrieval prompts

Module 8

Filtration and air cleaning

Why it matters: Filter class, installation seal, airflow, loading, system capacity, and application all affect actual performance.

Vocabulary and working scope

Filter purpose; MERV classification; loading; pressure drop; bypass/seal; fan response; gas-phase; UV/application-specific technologies; Standard 241 mode awareness; manufacturer criteria.

Source-to-result trace

  1. Locate the controlling requirement and establish authority.
  2. Identify the physical and digital boundaries.
  3. Preserve as-found state and timestamps.
  4. Trace the initiating condition through logic, interfaces, equipment, and process response.
  5. Compare expected and actual evidence.
  6. Calculate with units and stated tolerance.
  7. Record action, result, restoration, uncertainty, and owner.

Worked thinking prompt

A higher-efficiency filter is installed and supply airflow drops while bypass gaps remain visible.

Calculation: Calculate filter pressure-drop change and compare to exact manufacturer/project criteria and fan/system response.

Retrieval prompts

Module 9

TAB awareness and evidence reconciliation

Why it matters: Controller airflow and calculations are not certified TAB; instrument/method, conditions, uncertainty, and qualified report authority matter.

Vocabulary and working scope

Design airflow; scheduled min/max; hood/traverse/flow station/controller; standard versus actual air; density; uncertainty; report status; deficiencies; responsible role; no certification.

Source-to-result trace

  1. Locate the controlling requirement and establish authority.
  2. Identify the physical and digital boundaries.
  3. Preserve as-found state and timestamps.
  4. Trace the initiating condition through logic, interfaces, equipment, and process response.
  5. Compare expected and actual evidence.
  6. Calculate with units and stated tolerance.
  7. Record action, result, restoration, uncertainty, and owner.

Worked thinking prompt

The TAB report lists 600 cfm, the controller maximum is 800 cfm, and the point name matches a different box.

Calculation: Compare design, TAB, controller, and current values by identity, units, density basis, uncertainty, and percent difference.

Retrieval prompts

Module 10

Trend-quality, findings, referral, and capstone

Why it matters: Responsible IAQ communication is precise about evidence and uncertainty and never upgrades a BAS inference into a health or safety certification.

Vocabulary and working scope

Sampling; calibration; placement; weather; occupancy; activity; missing/stale data; findings; limitations; immediate action; source control; specialist referral; monitoring; recurrence prevention.

Source-to-result trace

  1. Locate the controlling requirement and establish authority.
  2. Identify the physical and digital boundaries.
  3. Preserve as-found state and timestamps.
  4. Trace the initiating condition through logic, interfaces, equipment, and process response.
  5. Compare expected and actual evidence.
  6. Calculate with units and stated tolerance.
  7. Record action, result, restoration, uncertainty, and owner.

Worked thinking prompt

The immediate ventilation fault is corrected, but odor source and occupant health concerns remain outside BAS scope.

Calculation: Reconcile complaint windows, valid data windows, actions, verified outcomes, unresolved questions, owners, and follow-up dates.

Retrieval prompts

Required and deeper reading

Adoption note: Standards, codes, project requirements, owner criteria, manufacturer instructions, and employer safety programs control. Confirm the adopted edition and authority before applying a numeric requirement.