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Motorcoach 608 Certification is EPA Approved and valid for all classes of HVAC and refrigeration work.
RESIDENTIAL
COMMERCIAL
INDUSTRIAL PROCESS
CHILLERS
SMALL APPLIANCES
R-22 & R-500 BUSES
609 Certification is valid for Motor Vehicle Air Conditioners including R-12 & R-134a Buses.
Certification Topics
TYPE III LOW PRESSURE SYSTEMS EXAM
The test topics that you should expect on the Type III Exam are:
Order of preference of leak test pressurization methods for low-pressure systems; first: hot water method or built-in system heating/pressurization device such as Prevac; second: nitrogen.
Signs of leakage into a low-pressure system, such as, excessive purging.
Maximum leak test pressure for low-pressure centrifugal chillers.
Allowable annual leak rate for commercial and industrial process refrigeration.
Allowable annual leak rate for other appliances containing more than 50 lbs of refrigerant.
RECOVERY TECHNIQUES
Recovering liquid at beginning of recovery process speeds up process.
Need to recover vapor in addition to liquid.
Need to heat oil to 130 degrees F before removing it to minimize refrigerant release.
Need to circulate or remove water from chiller during refrigerant evacuation to prevent freezing.
High-pressure cut-out level of recovery devices used with low-pressure appliances.
RECHARGING TECHNIQUES
Need to introduce vapor before liquid to prevent freezing of water in the tubes.
Need to charge centrifugals through evaporator charging valve.
RECOVERY AND EVACUATION REQUIREMENTS FOR:
Disposal.
Major or Minor repairs.
Size of system, over or under 200 pounds of refrigerant.
Recovery equipment, based on manufacture date.
Definitions of major and non-major repairs.
Allowable methods for pressurizing a low-pressure system for a non-major repair.
Need to wait a few minutes after reaching required recovery vacuum to see if system pressure rises, indicating that there is still liquid refrigerant in the system or in the oil.
REFRIGERATION
Purpose of purge unit in low-pressure systems.
Pressure-temperature relationships of low-pressure refrigerants.
SAFETY
Equipment room requirements under ASHRAE Standard 15, oxygen deprivation sensor with all refrigerants.
Under ASHRAE Standard 15, need to have equipment room refrigerant sensor for 123.