Technicians who perform sealed system service on small appliances must have;
Type I or Universal certification.
A small appliance is defined by EPA as;
Appliances manufactured, charged, and hermetically sealed in a factory with 5 Lbs or less of refrigerant
Type I Certification is required for;
persons handling refrigerant during maintenance, service, or repair of small appliances
If regulations change after the technician becomes certified;
The technician is responsibility for complying with any future changes in the regulations.
Recovery equipment manufactured after November 15, 1993 must be;
capable of recovering 90% of the refrigerant in the compressor os operating; 80% of refrigerant if its not or 4 inches of vaccum
Which of the following is true of small appliances refrigerant leaks;
EPA does not require repair, but leaks should be repaired whenever possible.
Recovery equipment manufactured after November 15, 1993 must be capable of recovering;
90% refrigerant or or achieving 4 inches of vacuum.
Recovering multiple types of refrigerants in the same cylinder;
will make the reclaimed refrigerants non reclaimable and a charge for disposal may be levied.
Self-contained or active recovery equipment;
Has its own means of recovery.
System-dependant or passive recovery equipment;
Captures refrigerant into a non-pressurized container with assistance of the appliance compressor.
What is defined as a non-condensible?
Air
When using a system-dependent recovery system on an appliance that has an operating compressor, the technician should;
Run the compressor and recover from the high side of the system.
When using a system-dependent recovery system on an appliance that has a non-operating compressor, the technician should;
Place access fitting on both the low and high side of the system.
System-dependant devices may only be used on appliances containing;
15 pounds of refrigerant or less.
Small appliances are equipped with a straight piece of tubing (process stub) used to;
install a piercing type access valve fitting.
If a strong odor is detected while performing the recovery process,
A compressor burnout has likely occurred.
After the refrigerant has been recovered, which of the following can be used to flush the system?
Nitrogen
When filling a charging cylinder with a regulated refrigerant;
The refrigerant vapor that is vented off the top of the cylinder must be recovered.
If after installing a fitting for the purpose of recovering the appliances refrigerant, you find that the system pressure is 0 psig;
Recovery is not required.
Applying heat with a heat gun to the compressor;
can help vaporize any trapped liquid refrigerant during recovery.
Refrigerators in the 1950's and earlier may have used what refrigerants (recovery is not required)?
Methyl Formate, Methyl Chloride, or Sulfur Dioxide.
Small appliances in recreational vehicles may use refrigerants such as Ammonia, Hydrogen, or water, and therefore;
The refrigerant should not be recovered.
Recovery equipment manufactured before November 15, 1993 must be capable of recovering.
80 percent of the refrigerant or achieving 4 inches of vacuum.
When pressurizing a system with nitrogen you should;
charge through a pressure regulator;place a relief valve in the downstream line from the pressure regulator.
After recovering refrigerant, the Nitrogen used to flush the system may be:
legally vented.
The sale of CFCs and HCFC's are
restricted to certified technicians
ARI 740 sets
recovery requirements
All equipment must be equipped with
low loss fittings
Low loss fittings should be able to
close manually or automatically when hoses are disconnected to minimize refidgerant loss
Before beginning a refrigerant recovery procedure, it is necessary
to know the type of refrigerant that is in the system.
self contained (active) recovery equipment stores itself in a
pressurized recovery tank
Before opening a self contained recovery machine make sure the
inlet valve is open, and tank does not contain excessive air (non condensables)
The only way to read refrigerant pressure correctly is at
a stable known temperature
Air in refrigeration systems will cause
higher discharge pressures
When purging non-condensables abide by
operating instruction supplied by equipment manfactuer
All refrigerant recovery equipment should be check for what on a daily basis
oil level and leaks
A system depended has a
special charcoal activated plastic "bag" containers
System dependent equipment captures refrigerant with the assistance of
an applicant compressor, external heat source, or vacuum pump
A standard vacuum pump can only be used in combination with a
non-pressurized container
In order to release trapped refrigerant from the compressor oil
heat and tap the compressor several times and/ or use a vacuum pump
Because appliances with non-operating compressors can not always achieve desired evacuation rates utilizing system dependent equipment
The EPA requires at least one self contained recovery device available at the shop
The exception to the EPA required rule of a self contained device available is technicians
working on small appliances only
System dependent devices may only be used on appliances
containing 15 lbs. of refrigerant or less.
When installing an access fitting onto a sealed system,
the fitting should be leak tested before proceeding with recovery.
It is generally recommended that _____ ____ type valves be used on only copper or aluminum tubing material, these fitting tend to leak over time and should not be left on a permanent service fixture.
Solder-less piercing
After installing a access fitting you the system pressure to be 0 PSIG
do not begin recovery process.
Operating a defrost heater on a domestic frost free refrigerator will help to
vaporize any trapped liquid refrigerant and will speed the recovery process.
When recovering refrigerant from a system that experienced a compressor burn-out,
watch for signs of contamination in the oil.
Small appliances may use such refrigerants as __,___,___ and therefore should not be recovered with current using current recovery equipment.
Ammonia, Hydrogen, Water