ASHRAE Technical Specifications 2 — Questions and Answers
Question 1: A specification requires air filters rated per ASHRAE Standard 52.2. Which rating metric does that standard produce?
- Arrestance percentage only
- HEPA class
- ISO ePM1 rating
- MERV (Minimum Efficiency Reporting Value) (Correct answer)
Correct answer: MERV (Minimum Efficiency Reporting Value)
ASHRAE 52.2 tests particle-size removal efficiency and reports the result as a MERV of 1 to 16.
Question 2: Under the ASHRAE 62.1 Ventilation Rate Procedure, the breathing-zone outdoor airflow (Vbz) combines which two components?
- Supply air temperature and CO2 setpoint
- Exhaust rate and infiltration rate
- A per-person rate (Rp) and a per-floor-area rate (Ra) (Correct answer)
- Air changes per hour and duct leakage
Correct answer: A per-person rate (Rp) and a per-floor-area rate (Ra)
Vbz = Rp × Pz + Ra × Az, so it accounts for both occupant-related and building-related contaminants.
Question 3: Which ASHRAE standard is the Safety Standard for Refrigeration Systems?
- Standard 34
- Standard 62.1
- Standard 55
- Standard 15 (Correct answer)
Correct answer: Standard 15
ASHRAE 15 covers the safe design, construction, installation and operation of refrigeration systems.
Question 4: Under ASHRAE Standard 34, what does refrigerant safety group A2L mean?
- Higher toxicity, no flame propagation
- Lower toxicity, higher flammability
- Lower toxicity, lower flammability (mildly flammable) (Correct answer)
- Higher toxicity, lower flammability
Correct answer: Lower toxicity, lower flammability (mildly flammable)
'A' means lower toxicity, and '2L' is the mildly flammable subclass with a burning velocity of 10 cm/s or less.
Question 5: ASHRAE Standard 55 commonly defines an acceptable thermal environment as one with a predicted percentage dissatisfied (PPD) below what value?
- 5%
- 20%
- 25%
- 10% (Correct answer)
Correct answer: 10%
A PMV between -0.5 and +0.5 corresponds to a PPD under 10%, which is the Standard 55 comfort criterion.
Question 6: A controls specification calls for interoperability per ASHRAE Standard 135. What protocol is that?
- Modbus
- KNX
- LonWorks
- BACnet (Correct answer)
Correct answer: BACnet
ASHRAE 135 defines BACnet, a data communication protocol for building automation and control networks.
Question 7: Which ASHRAE standard sets requirements for managing Legionellosis risk in building water systems?
- Standard 170
- Standard 180
- Standard 188 (Correct answer)
- Standard 189.1
Correct answer: Standard 188
ASHRAE 188 requires a water management program to reduce the risk of Legionella in building water systems.
ASHRAE Technical Specifications 2
A specification requires air filters rated per ASHRAE Standard 52.2.
Which rating metric does that standard produce?