EPA Section 608 Technician Certification (Universal) — Questions and Answers

Question 1: What does the term 'refrigerant reclaim' mean?

Reusing refrigerant without processing
Removing refrigerant from equipment into a recovery cylinder
Reprocessing refrigerant to original purity standards (Correct answer)
Transferring refrigerant between cylinders

Correct answer: Reprocessing refrigerant to original purity standards

Reclaim means reprocessing used refrigerant to the purity standards of ARI 700, essentially restoring it to virgin quality. This is distinct from recover (remove) or recycle (clean on-site).

Question 2: What is the primary cause of microbial contamination in drain pans and coils?

Chemical reactions between refrigerant and coil materials
Metallic corrosion products from the coil fins
Standing water, organic debris, and warm temperatures providing ideal growth conditions (Correct answer)
High refrigerant charge

Correct answer: Standing water, organic debris, and warm temperatures providing ideal growth conditions

Drain pans and coils provide ideal conditions for microbial growth: standing water (moisture), organic debris carried by the airstream (nutrients), and moderate temperatures. Regular cleaning and biocide treatment are essential for indoor air quality.

Question 3: What type of ignition system has largely replaced standing pilot lights in modern gas furnaces?

Glow plug ignition
Electronic spark or hot surface ignition (Correct answer)
Thermocouple ignition
Piezoelectric ignition

Correct answer: Electronic spark or hot surface ignition

Modern furnaces use electronic ignition — either an intermittent spark igniter or a hot surface igniter (a silicon carbide or silicon nitride element that glows red-hot). These systems only activate at call for heat, eliminating the energy waste of a continuously burning pilot flame.

Question 4: Which federal agency regulates the sale and use of refrigerants under Section 608?

DOT
NIOSH
OSHA
EPA (Correct answer)

Correct answer: EPA

The Environmental Protection Agency (EPA) administers and enforces Section 608 of the Clean Air Act, which governs refrigerant handling, recovery, and technician certification.

Question 5: What is 'commissioning' of a BAS and why is it required?

Replacing outdated pneumatic controls with DDC
Annual calibration of all BAS sensors
A systematic process to verify that the BAS is programmed and operating according to the design intent (Correct answer)
The initial purchase and installation of BAS hardware

Correct answer: A systematic process to verify that the BAS is programmed and operating according to the design intent

BAS commissioning is the systematic process of verifying that the installed system matches the design intent — checking that sensors are calibrated, control sequences are programmed correctly, setpoints are met, and the system performs as specified.

Question 6: What is 'line set flushing' and when is it required for mini-split installation?

Flushing the line set with water to check for blockages
Running refrigerant through the line set to pre-condition it
Pressure testing the line set with nitrogen before charging
Removing old oil and contaminants from existing copper line sets when reusing them with a new mini-split system (Correct answer)

Correct answer: Removing old oil and contaminants from existing copper line sets when reusing them with a new mini-split system

Line set flushing uses a dedicated flushing agent (not refrigerant) to remove old oil, moisture, and contaminants from existing copper line sets. Required when reusing old line sets from a previous system, especially when switching refrigerant types or after a compressor burnout.

Question 7: Which commercial HVAC system component is responsible for distributing conditioned air to specific zones based on thermostat demand?

Cooling tower fan
Chilled water pump
VAV terminal box (Correct answer)
Air handling unit (AHU)

Correct answer: VAV terminal box

VAV terminal boxes modulate airflow to individual zones in response to zone thermostat signals, providing precise temperature control.

Question 8: Under EPA Section 608, which entity is solely authorized to reclaim refrigerant back to ARI 700 purity standards for resale?

The original equipment manufacturer (OEM)
Any EPA 608-certified HVAC technician
A facility certified by the EPA as a refrigerant reclaimer (Correct answer)
A state-licensed HVAC contractor with a reclamation endorsement

Correct answer: A facility certified by the EPA as a refrigerant reclaimer

Only facilities that have registered with the EPA as certified refrigerant reclaimers may reclaim refrigerant to ARI 700 standards for resale.

Question 9: What is the purpose of a disconnect switch near an outdoor HVAC unit?

To manually switch the system between heating and cooling modes
To connect the thermostat wiring to the outdoor unit
To protect the unit from voltage spikes and surges
To provide a local means of de-energizing the unit for safe service work (Correct answer)

Correct answer: To provide a local means of de-energizing the unit for safe service work

The disconnect switch allows service technicians to safely de-energize the outdoor unit locally without going to the main electrical panel, as required by OSHA and NEC.

Question 10: What is the purpose of a modulating gas valve in a high-efficiency furnace?

To shut off gas flow immediately if a flame failure is detected
To allow the furnace to switch between natural gas and propane fuels
To regulate gas pressure from the utility supply to burner pressure
To vary the gas flow rate so the furnace can operate at partial capacity to match heating demand (Correct answer)

Correct answer: To vary the gas flow rate so the furnace can operate at partial capacity to match heating demand

A modulating valve allows the furnace to fire at varying percentages of its rated capacity (e.g., 40–100%) rather than only full-on or full-off. This closely matches heat output to actual demand, improving comfort, efficiency, and reducing temperature swings.

Question 11: In HVAC, what does the term 'throw' refer to when selecting supply air diffusers?

The pressure drop across the diffuser
The horizontal distance the supply air travels before its velocity drops to 50 FPM (Correct answer)
The angular spread of the air pattern from the diffuser
The volume of air delivered by the diffuser

Correct answer: The horizontal distance the supply air travels before its velocity drops to 50 FPM

Throw is the horizontal distance that the primary air stream from a diffuser travels to reach a terminal velocity (typically 50 FPM) before mixing with room air.

Question 12: What type of motor is most commonly used for HVAC variable-speed blowers in high-efficiency systems?

Single-phase induction motor
Universal motor
DC shunt motor
ECM (Electronically Commutated Motor) (Correct answer)

Correct answer: ECM (Electronically Commutated Motor)

ECM (Electronically Commutated Motor) blowers are brushless DC motors that can vary speed precisely and are 60-70% more efficient than standard PSC motors.

Question 13: What is the required clearance above and around a mini-split outdoor unit for proper airflow?

No clearance required if the fan is rated for restricted conditions
Manufacturer-specified clearances (typically 6-12 inches on sides, 12-24 inches in front for discharge, and clear above) (Correct answer)
Only front clearance is important — sides can be enclosed
2 inches on all sides is sufficient

Correct answer: Manufacturer-specified clearances (typically 6-12 inches on sides, 12-24 inches in front for discharge, and clear above)

Mini-split outdoor units require manufacturer-specified clearances for proper airflow and serviceability. Typical requirements: 6-12 inches on sides and rear, 12-24+ inches in front of the discharge (or above for vertical discharge), and unobstructed overhead. Restricted airflow raises head pressure and reduces efficiency.

Question 14: What communication standard is used by most modern BAS for Ethernet-based communication?

Modbus TCP
BACnet/IP over Ethernet (Correct answer)
LonWorks FT-10
BACnet MS/TP over RS-485

Correct answer: BACnet/IP over Ethernet

BACnet/IP (BACnet over Internet Protocol) uses standard Ethernet networking infrastructure, allowing BAS devices to communicate over the building's IT network. This enables remote access, integration with enterprise systems, and use of standard network infrastructure.

Question 15: ASHRAE Standard 90.1 applies primarily to:

HVAC equipment manufacturing tolerances
Indoor air quality in healthcare facilities
Residential buildings under three stories
Commercial buildings and high-rise residential energy efficiency (Correct answer)

Correct answer: Commercial buildings and high-rise residential energy efficiency

ASHRAE 90.1 sets minimum energy efficiency requirements for commercial buildings and serves as the basis for most commercial building energy codes.

Question 16: What is the maximum allowable leak rate for refrigerant systems with a charge over 50 lbs in comfort cooling applications under EPA Section 608?

5% per year
10% per year
20% per year
15% per year (Correct answer)

Correct answer: 15% per year

EPA Section 608 sets the leak rate trigger at 15% of the total charge per year for comfort cooling equipment with charges over 50 lbs.

Question 17: What is a heat pump's Heating Seasonal Performance Factor (HSPF) used to measure?

The refrigerant charge level in a heat pump
The seasonal heating efficiency of a heat pump (Correct answer)
The airflow capacity of a heat pump system
The efficiency of heat pump cooling in summer

Correct answer: The seasonal heating efficiency of a heat pump

HSPF measures the total heating output of a heat pump divided by the total electrical energy it consumes over a heating season.

Question 18: What is the primary function of an air handler unit (AHU) in an HVAC system?

Measure and control building humidity only
Condition and circulate air throughout the building (Correct answer)
Control refrigerant flow to the outdoor unit
Generate refrigeration by compressing refrigerant

Correct answer: Condition and circulate air throughout the building

An air handler unit (AHU) conditions and circulates air. It typically contains a blower, heating/cooling coils, filters, dampers, and controls to deliver conditioned air to occupied spaces.

Question 19: Which standard governs cybersecurity requirements for building automation and control network systems?

UL 864
NFPA 72
ASHRAE 90.1
NIST SP 800-82 and ASHRAE Guideline 13 (Correct answer)

Correct answer: NIST SP 800-82 and ASHRAE Guideline 13

NIST SP 800-82 and ASHRAE Guideline 13 address cybersecurity best practices for industrial and building control network systems.

Question 20: What is 'constant volume' versus 'variable volume' air distribution in commercial HVAC?

The difference only applies to exhaust air systems, not supply air
CAV uses multiple speed fans; VAV uses fixed-speed fans with dampers
Constant volume (CAV) maintains fixed airflow; Variable volume (VAV) modulates airflow to match zone loads (Correct answer)
CAV systems are newer technology; VAV systems are older

Correct answer: Constant volume (CAV) maintains fixed airflow; Variable volume (VAV) modulates airflow to match zone loads

CAV (Constant Air Volume) systems supply a fixed airflow to zones and control temperature by changing supply air temperature. VAV (Variable Air Volume) systems maintain a fixed supply air temperature but vary the airflow to each zone to match its load — significantly more energy efficient at part load.

Question 21: Which refrigerant blend requires special 'push-pull' recovery techniques due to its zeotropic behavior causing fractionation?

R-22
R-404A (Correct answer)
R-134a
R-410A

Correct answer: R-404A

R-404A is a zeotropic blend whose components can separate (fractionate) during recovery, making push-pull or liquid-phase recovery preferable.

Question 22: When should a refrigerant recovery cylinder be condemned and removed from service?

After 5 years of use
When the DOT-rated pressure is exceeded or physical damage is visible (Correct answer)
When the weight exceeds the tare weight by 20%
After being filled and emptied 10 times

Correct answer: When the DOT-rated pressure is exceeded or physical damage is visible

Recovery cylinders must be condemned when they show physical damage (dents, corrosion, leaks), when the DOT retest date has expired, or when pressure ratings have been exceeded. Safety comes first.

Question 23: What is the difference between a 'hardwired' point and a 'network' point in a BAS?

Hardwired points are analog; network points are digital
Hardwired points are permanent; network points can be added remotely
Hardwired points are physically wired to the controller; network points communicate via a digital network protocol (Correct answer)
Hardwired points control equipment; network points only monitor

Correct answer: Hardwired points are physically wired to the controller; network points communicate via a digital network protocol

Hardwired (or physical) points are sensors/actuators directly wired to controller I/O terminals. Network points are communicated digitally via protocols like BACnet MS/TP, allowing remote devices to share data across the network without individual wiring.

Question 24: What is the function of a 'passive' or 'system-dependent' recovery device?

It monitors system pressure and triggers recovery automatically
It uses the system's own compressor to push refrigerant into the recovery cylinder (Correct answer)
It automatically stops recovery when the cylinder reaches 80% capacity
It uses gravity to drain refrigerant from elevated systems

Correct answer: It uses the system's own compressor to push refrigerant into the recovery cylinder

A passive (system-dependent) recovery device uses the system's own compressor to assist moving refrigerant into the recovery cylinder, requiring no separate recovery machine motor.

Question 25: What is the function of a TXV (thermostatic expansion valve) in relation to the evaporator coil?

It controls airflow through the coil
It regulates the blower motor speed
It controls condensate drainage
It meters refrigerant flow into the coil based on superheat (Correct answer)

Correct answer: It meters refrigerant flow into the coil based on superheat

The TXV meters refrigerant flow into the evaporator coil by sensing superheat, ensuring the coil operates efficiently without liquid refrigerant returning to the compressor.

Question 26: Which code or standard establishes minimum efficiency requirements for residential central air conditioners in the United States?

DOE minimum efficiency standards (SEER ratings) (Correct answer)
OSHA 29 CFR 1910
NFPA 90A
ASHRAE 90.1

Correct answer: DOE minimum efficiency standards (SEER ratings)

The U.S. Department of Energy sets minimum SEER (Seasonal Energy Efficiency Ratio) ratings for residential central air conditioners, which vary by climate region.

Question 27: What does a high-pressure lockout on a condensing unit protect against?

Low ambient temperature operation
Low refrigerant charge
Excessively high discharge pressure that could damage the compressor (Correct answer)
Inadequate airflow across the evaporator coil

Correct answer: Excessively high discharge pressure that could damage the compressor

A high-pressure lockout switch shuts down the unit when discharge pressure exceeds safe limits, preventing compressor damage from excessive head pressure.

Question 28: What does 'ductless' mini-split installation typically require for drainage of condensate?

A P-trap and drain connected to the building's plumbing system only
No drainage is required — condensate evaporates in the indoor unit
Gravity drain to the exterior or condensate pump if gravity drain is not feasible, with proper pitch on the drain line (Correct answer)
Only a drain pan below the indoor unit — no drain line needed

Correct answer: Gravity drain to the exterior or condensate pump if gravity drain is not feasible, with proper pitch on the drain line

Mini-split indoor units produce condensate during cooling mode that must be drained. Gravity drainage to the exterior (with minimum 1/4 inch per foot pitch) is preferred. If the unit cannot gravity drain (e.g., basement installation), a condensate pump must be used to lift the condensate to a drain.

Question 29: What does the SEER2 rating measure for a ductless mini-split system?

Cooling efficiency over a cooling season (Correct answer)
Heating efficiency over a season
Maximum BTU output at peak load
Noise level at rated capacity

Correct answer: Cooling efficiency over a cooling season

SEER2 (Seasonal Energy Efficiency Ratio 2) measures the cooling output divided by electrical energy input over a typical cooling season.

Question 30: What is the boiling point of R-410A at atmospheric pressure?

-41.5°F (-40.8°C)
-51.4°F (-46.3°C) (Correct answer)
-12.0°F (-24.4°C)
2.5°F (-16.4°C)

Correct answer: -51.4°F (-46.3°C)

R-410A has a boiling point of approximately -51.4°F (-46.3°C) at atmospheric pressure (14.7 psia). This very low boiling point means it vaporizes rapidly if released, and systems operate at significantly higher pressures than R-22.

EPA Section 608 Technician Certification (Universal)

The EPA Section 608 exam certifies HVAC technicians to legally purchase and handle refrigerants under federal environmental regulations. Universal certification covers all four sections: Core regulations, Type I small appliances, Type II medium/high-pressure systems, and Type III low-pressure systems.

Questions

35 min

Time Limit

70%

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