Why risk fines up to $27,500.00 per violation per day for not having the
proper certifications?
Recent EPA Enforcement Actions
Have questions about the EPA'S Rules and Regulation?
Use the Link Below.
Link to EPA Rules & Regulations
Let us Train and Certify your staff.
These tidbits and the many others that we have provided our customers over the past eighteen years are a small token of our appreciation to the most important people in the world. Our Customers!
Our office is open from 8am to 4pm Mountain Standard Time Monday thru Thursday
Contact Us
Phone: 623-934-0909
E-mail to: Contact Us
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.
Recent EPA Enforcement Actions
Have questions about the EPA'S Rules and Regulation?
Use the Link Below.
Link to EPA Rules & Regulations
Let us Train and Certify your staff.
These tidbits and the many others that we have provided our customers over the past eighteen years are a small token of our appreciation to the most important people in the world. Our Customers!
Our office is open from 8am to 4pm Mountain Standard Time Monday thru Thursday
Contact Us
Phone: 623-934-0909
E-mail to: Contact Us
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.
Bus Maintenance News
Maintenance Topics
Back to Bus
Maintenance Topics
Preparing for
Certification Tests
608 Core Exam Study
Topics
608 Type I Exam
Study Topics
608 Type II Exam
Study Topics
TYPE III LOW PRESSURE SYSTEMS EXAM
Leak Detection
- Order of preference of leak test pressurization methods for low-pressure systems (first: hot water method or built-in system heating/pressurization device such Prevac; second: nitrogen)
- Signs of leakage into a low-pressure system (e.g., excessive purging)
- Maximum leak test pressure for low-pressure centrifugal chillers
Leak repair requirements
- 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 130F 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 Requirements
- Evacuation requirements for low-pressure appliances in each of the following situations:
-
- Disposal
- Major vs. non-major repairs
- Leaky vs. non-leaky appliances
- Appliance (or component) containing less vs. more than 200 lbs
- Recovery/recycling equipment built before vs. after November 15, 1993
- Definitions of "major" and "non-major" repairs
- Allowable methods for pressurizing a low-pressure system for a non-major repair (controlled hot water and system heating/pressurization device such as Prevac)
- 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