313D Safety and Regulations Questions and Answers 1 — Questions and Answers
Question 1: A technician servicing a residential split system needs to replace a leaking Schrader core on the suction line. They briefly vent a small amount of R-410A refrigerant to the atmosphere before replacing the core. According to Canadian federal and provincial regulations, what is the status of this action?
- It is permissible as a 'de minimis' release necessary for service.
- It is a violation of regulations, as any intentional venting of HFC refrigerants is prohibited. (Correct answer)
- It is allowed only for certified technicians during emergency repairs.
- It is acceptable as long as it is documented in the service log and is under 50 grams.
Correct answer: It is a violation of regulations, as any intentional venting of HFC refrigerants is prohibited.
Federal Halocarbon Regulations and provincial rules, such as Ontario's O. Reg. 463/10, strictly prohibit the intentional release of HFC refrigerants like R-410A into the environment. There is no provision that allows for 'de minimis' or small intentional releases during service; proper recovery procedures must always be used.
Question 2: Before replacing a faulty blower motor in a residential air handler, which of the following represents the most critical and complete safety procedure?
- Turn off the thermostat and pull the outdoor disconnect.
- Wear insulated gloves and use non-conductive tools.
- Turn off the circuit breaker for the air handler at the main electrical panel.
- Isolate, lock out, and tag the circuit breaker controlling the air handler. (Correct answer)
Correct answer: Isolate, lock out, and tag the circuit breaker controlling the air handler.
The most critical safety procedure is to de-energize the equipment and ensure it cannot be accidentally re-energized. This is accomplished by turning off the correct circuit breaker, applying a personal lock (lockout), and attaching a tag (tagout) to inform others that the circuit is being serviced. This prevents accidental startup and electrical shock.
Question 3: While preparing to use a new coil cleaning chemical, a technician observes a WHMIS 2015 pictogram on the label that features a skull and crossbones. What specific hazard does this symbol represent?
- Biohazardous infectious material
- Corrosive damage to skin or metals
- Acute toxicity (fatal or toxic with short exposure) (Correct answer)
- Flammable or combustible material
Correct answer: Acute toxicity (fatal or toxic with short exposure)
The skull and crossbones pictogram in WHMIS 2015 is used to indicate that a substance can cause death or acute toxicity with short exposure to small amounts, whether ingested, inhaled, or through skin contact. Technicians must recognize this symbol and consult the Safety Data Sheet (SDS) for specific handling precautions.
Question 4: A technician is transporting a 30 lb cylinder of R-410A and a recovery cylinder in their work van. According to Canada's Transportation of Dangerous Goods (TDG) Regulations, which of the following is a mandatory requirement?
- The cylinders must be secured in an upright position. (Correct answer)
- The vehicle must display a Class 2.2 placard for any amount.
- A full shipping document is required for a single cylinder.
- The cylinders must be kept in a climate-controlled compartment.
Correct answer: The cylinders must be secured in an upright position.
TDG regulations require that compressed gas cylinders, classified as Class 2 gases, must be secured against movement in an upright position during transport to prevent damage or rupture. While exemptions for placarding and full documentation often apply to the quantities carried by service technicians, the requirement to secure the load is fundamental for safety.
Question 5: When connecting refrigerant gauges to a pressurized residential air conditioning system, what is the minimum Personal Protective Equipment (PPE) a technician must wear to protect against the most immediate hazards?
- A hard hat and steel-toed boots
- Safety glasses with side shields and gloves (Correct answer)
- A respirator with organic vapor cartridges
- A long-sleeved cotton shirt and hearing protection
Correct answer: Safety glasses with side shields and gloves
The primary hazards when connecting gauges are high-pressure spray and contact with liquid refrigerant, which can cause severe eye injury and frostbite. Therefore, safety glasses with side shields (or goggles) and insulated or leather gloves are the minimum required PPE to protect against these immediate risks.
Question 6: In which of the following installation locations is a secondary drain pan with a float switch or separate drain line required by the Ontario Building Code?
- In a basement, if the floor is unfinished concrete.
- For all horizontal air handler installations.
- When the condensing unit is installed on a flat roof.
- In an attic or above a finished ceiling where overflow could cause damage. (Correct answer)
Correct answer: In an attic or above a finished ceiling where overflow could cause damage.
Building codes mandate that when an air handler or evaporator coil is installed in a location where condensate overflow could cause damage to the building structure or finishes (like an attic or above a ceiling), a secondary drain pan is required. This pan must either have its own drain line to a conspicuous location or a water-level detection device (float switch) that shuts down the equipment to prevent water damage.
313D Safety and Regulations Questions and Answers 1
A technician servicing a residential split system needs to replace a leaking Schrader core on the suction line.
They briefly vent a small amount of R-410A refrigerant to the atmosphere before replacing the core.
According to Canadian federal and provincial regulations, what is the status of this action?