Type II Certification

Question 1

What does Type II Certification handle

Answer 1

This Certification is for Technicians working with medium, high, Or Very High pressure refrigerants.

Question 2

What do Filter Driers do

Answer 2

They remove any acid, moisture, or particulates before having the pressure drop through small passages of the expansion valve.

Question 3

What should you not do when the system is a vacuum with a hermetic compressor

Answer 3

Never operate the compressor during this stage. If you do, the motor windings rapidly overheat and damage the compressor by burning the electrical windings.

Question 4

Open drive compressor leaks

Answer 4

When a large system with an open-drive compressor has a substantial leak, check the compressor shaft seal first.

Question 5

What happens during the off Cycle in the compressor crank case?

Answer 5

When the refrigerant system shuts off, the oil in the compressor crankcase absorbs refrigerant.

Question 6

What does heating the oil in the compressor help reduce?

Answer 6

Heating the oil reduces the amount of refrigerant in the lubricating oil by reducing the solubility of the compressor of the compressor oil for refrigerant. Keeping the compressor oil warm also keeps refrigerant from migrating to the compressor.

Question 7

Recovery equipment Tested or not tested?

Answer 7

Recycling equipment must be tested by an EPA - approved third party, be certified for use with the refrigerant being recovered, and be equipped with low loss fittings.

Question 8

Should you use a system dependent recovery equipment when the charge is more than 15 pounds of refrigerant?

Answer 8

No - You cant use system- dependent recovery equipment when the normal charge of the appliance is more than 15 pounds of refrigerant.

Question 9

What should you do before transferring refrigerant into an empty recovery cylinder?

Answer 9

You should evacuate the cylinder.

Before transferring refrigerant into an empty recovery cylinder, you should evacuate the cylinder.

Question 10

Where do Non- condensable gases tend to collect?

Answer 10

They collect in the condenser.

If any non-condensable gasses get into the refrigerant system, these non-condensable tend to collect in the condenser and raise the discharge pressure ( High-side pressure) of the system.

Question 11

What are the following routine maintenance tasks on you refrigerant recovery or recycling machine?

Answer 11

Replace the filter drier if your system has one ( typically recycling machine has at least one)

Empty waste oil separator

Change the compressor oil

Question 12

What is the filter drier designed to do?

Answer 12

The Filter drier is designed to trap acid and particulates and to remove the water from the refrigerant.

Question 13

If the system has a leak, what don’t you have to do in regards to atmospheric pressure?

Answer 13

If the system has a leak, you don’t have to recover to below atmospheric pressure. Evacuating to below atmospheric pressure could cause air and moisture to be ingested into the recovered refrigerant.

Question 14

What involves major maintenance, service or repair?

Answer 14

Major maintenance, service, or repair involves:

Compressor
Condenser
Evaporator
Auxiliary Heat Exchange Coil

Question 15

What should you do after reaching the required recovery vacuum on an appliance?

Answer 15

After reaching after reaching the required recovery vacuum on an appliance, you should isolate the system and wait for at least a few minutes to see if the system pressure rises, which would indicate there is still refrigerant in the liquid form or refrigerant in the oil.

Question 16

Why should you recover refrigerant in a liquid phase?

Answer 16

You can save time recovering the refrigerant from a system by first removing the refrigerant in the liquid phase.

Recovering vapor refrigerant doesn’t remove the oil from the system.

Question 17

What other steps can you do to make the recovery a faster processes?

Answer 17

You can cool the recovery cylinder, which lowers the pressure in the recovery cylinder. This can be done by packing the cylinder in ice.

Question 18

What should you do before recharging the system?

Answer 18

You always dehydrate or dry out the system completely. To make sure there is no water or water vapor in the system.

Question 19

How many microns is a triple evacuation of the system?

Answer 19

500 microns

Question 20

What happens if you use too large of a vacuum pump?

Answer 20

The pressure could drop too fast, potentially causing the evaporating water in the system to cool and freeze, making further water removal more difficult.

Question 21

What does the EPA allow you to add during an evacuation to help get rid frozen moisture?

Answer 21

The use of nitrogen in the triple evacuation procedure increases the pressure in the system, mixes with any residual refrigerant and moisture and it helps to warm the frozen moisture in the system.

Question 22

What do you look for when inspecting for leaks in a system?

Answer 22

First look for traces of oil residue and dirt on the system.

Question 23

If the system is evacuated what can you use to check for leaks?

Answer 23

You can use pressurized nitrogen gas to search for the leak. && You can put small traces of refrigerant in the system.

Note: You don’t need to recover this mixture of nitrogen and the trace amount of refrigerant that was used to perform the leak check.

Question 24

According to the EPA what is a simple method to pinpoint refrigerant leaks?

Answer 24

The soap bubble test.

Question 25

When must you repair the leak in a system?

Answer 25

With systems 50 pounds or more of refrigerant in a single independent refrigerant circuit, you are required by law to fix the leakage rate if it is “substantial”.

Question 26

How long do you have to fix a leak with 50 pounds or more?

Answer 26

You only have 30 days (or 120 days where in an industrial process shutdown is required) to fix the leak and verify it’s repaired, as described in the following sections. If the leakage rate isn’t substantial.

Question 27

Define Refrigeration Appliances

Answer 27

The EPA defines refrigeration appliances used in the retail food and cold storage warehouse sectors as commercial refrigeration equipment. Retail food appliances include refrigerant equipment found in supermarkets, convenience stores, restaurants, and other food service establishments.

Cold storage includes the refrigeration equipment used to store meat, produce, diary products, and other perishable goods.

Question 28

Define Industrial Refrigeration Appliances

Answer 28

Any refrigeration appliance that is directly linked to the process used in, for example, the chemical pharmaceutical petrochemical, and manufacturing Industries. This sector also includes industrial ice machines, appliances used directly in the generation of electricity and ice rinks.

Question 29

When both appliances are used industrial and Commercial, what does the EPA consider the appliance?

Answer 29

It is considered industrial process refrigeration equipment if 50% or more of its operating capacity is used.

Question 30

When must you repair leaks in commercial and industrial refrigeration equipment?

Answer 30

You must repair leaks that normally contain more than 50 pounds of refrigerant if you calculate the currently projected leak rate to be more than 35% of the total charge per year.

Question 31

What is the minimum annual leak rate after repairing the equipment ?

Answer 31

The annual leak rate has to be less than 35%. You only have 30 days to repair the leak for commercial.

Question 32

What is the maximum leak rate for industrial refrigeration equipment?

Answer 32

The max leak rate for industrial equipment is 50 pounds or more at 30% of the total charge per year.

Question 33

What is the maximum leak rate for commercial refrigeration systems?

Answer 33

The max leak rate for commercial is 50 pounds or more at 20% of the total charge per year.

Question 34

What is the easiest way to find the type of refrigerant and charge in a system?

Answer 34

The manufactures nameplate. Some customized equipment does not have nameplates.
The EPA allows calculations based on component and pipe size to determine the full system charge and if it exceeds more than 50 pounds and the to determine the leakage rate.

Question 35

What else should you do when repairing a leak with a normal charge of 50 pounds or more?

Answer 35

Notify the EPA, unless the leak amounts to an actual leakage of 125% of the normal charge in a calendar year. You must still keep accurate records that include all leak rate calculations that were performed, when any quantity of refrigerant was added and anytime the owner/operator was informed of a substantial leak rate.

Question 36

What if you cant fix a leak in the EPA’s allotted time?

Answer 36

If you cant bring a leak rate below the required leak rate in the allotted time, you must document all repair efforts and notify EPA of the reason you couldn’t fix the leak.

Question 37

What else should you do if you cant fix the leak in the allotted time?

Answer 37

You must retrofit or replace the equipment. If you cant get the parts you need to repair the system, you can apply for an extension, but you are only given of time it takes to receive the necessary parts.

Note: The EPA wont extend the appliance repair deadline because the owner/operator is unable schedule a service repair technician in time to perform the repair.

Question 38

When should you follow up on the leak test for verification?

Answer 38

You must perform a follow up verification test within 10 days of the successful initial verification test or 10 days after the appliance reaches normal operating characteristics and conditions.

Question 39

How often should you conduct leak inspections for charges of 500 or more pounds in commercial refrigeration?

Answer 39

For commercial refrigeration and industrial process refrigeration appliances with a full charge of 500 or more pounds, you must conduct leak inspections once every three months until you demonstrate that the appliance has not leaked in excess of the applicable leak rate for four quarters in a row.

Question 40

How often should you conduct leak inspections for charges of 50- 500 or more pounds in commercial refrigeration?

Answer 40

For commercial refrigeration and industrial process refrigeration appliances with a full charge of 50 or more pounds but less than 500 pounds, you must conduct a leak inspection once per calendar year until you demonstrate that the appliance has not leaked in excess of the applicable leak rate for one year.

Question 41

How often should you conduct leak inspections for charges of 50 or more pounds in commercial refrigeration?

Answer 41

If comfort cooling or other appliance containing more than 50 pounds of refrigerant had a leak that exceeded the allowable leak rate, you must conduct leak inspections once per calendar year until you demonstrate that the appliance has not leaked in excess of the applicable leak rate for one year.

Question 42

Mothballing means?

Answer 42

Mothballing means the evacuate refrigerant from an appliance, to at least atmospheric pressure and to temporarily shut down that appliance.

Question 43

with appliances that is 50 or more pounds of refrigerant should you give the owner?

Answer 43

You should give the owner an invoice that indicates the amount of refrigerant added to the appliance. Also, keep accurate records to prove the existence or non-existence of a substantial leak, as well as records to prove that you properly notified the owner/ operator of any substantial leaks.

Question 44

After notifying the owner, what should you do when appliances that have 50 pounds or more of refrigerant leaking?

Answer 44

The owner/operator must take further action by repairing, retiring, mothballing, or retrofitting the appliance.

Question 45

How long does the owner have to either retrofit or retire the unit?

Answer 45

The owner/operator has 18 month to Retire or Retrofit the equipment if the replacement refrigerant (or unit) is an exempt refrigerant or 12 months if the replacement refrigerant is subject to the venting prohibition.

Question 46

With appliances of 50 pounds or more, how long should you keep records?

Answer 46

Up to 3 years. You must keep records of leak inspections, initial leak verification test for 3 years and you should plan to keep you records for at least the same period.

Question 47

What should you do if there is water in the Heat exchanger, when evacuating a system?

Answer 47

You must be careful that the water doesn’t freeze if the liquid refrigerant is being charged into the evacuated system evaporates. Turn on any water pumps if possible.

The evaporating refrigerant can’t freeze the water if the evaporation temperature is above freezing. Therefore, initially charge the system as a vapor until the saturation pressure is above the freezing point of water to avoid the risk of freezing the water.

Question 48

When can you charge the refrigerant back into the system if the following conditions are met?

Answer 48

Refrigerant has been recovered from an air conditioning system and held refillable cylinder so a mechanically damaged condenser or evaporator coil could be replaced.

There are no signs of moisture.

And a quick acid test is conducted.

Question 49

What do you do if you smell a pungent odor in the oil recovered from the system?

Answer 49

the refrigerant has become acidic and the compressor has probably burnt out. Although you don’t need to have the oil analyzed to verify this burnout, taking an oil sample and having it tested will verify the system has had a burnout.

Question 50

What does ASHRAE Standard 15 require in regards to release of refrigerant into the air?

Answer 50

It requires an equipment room refrigerant monitor to detect when refrigerant has displaced the breathing air in the room to prevent asphyxia.