© 2012 Mobile Climate Control T-299 Rev. 08/2012
Safety --1
SAFETY SUMMARY
GENERAL SAFETY NOTICES
The following general safety notices supplement the specific warnings and cautions appearing elsewhere in this
manual. They are recommended precautions that must be understood and applied during operation, service,
and maintenance of the equipment covered herein. The general safety notices are presented in the following
three sections labeled: First Aid, Operating Precautions and Maintenance Precautions. A listing of the specific
warnings and cautions appearing elsewhere in the manual follows the general safety notices.
FIRST AID
An injury, no matter how slight, should never go unattended. Always obtain first aid or medical attention
immediately.
OPERATING PRECAUTIONS
Always wear pro tective eye wear (safety glasses or goggles).
Keep hands, clothing and tools clear of the evaporator and condenser fans.
No work should be performed on the system unless battery power is disconnected.
Always work in pairs. Never work on the equipment alone.
In case of severe vibration or unusual noise, stop the system and investigate.
MAINTENANCE PRECAUTIONS
Familiarize yourself with the proper operation of any service equipment you will be using (voltmeter, amp
probe, manifold gauges, etc.). Always read th e owner's manual th at is enclosed with th e equipment
Always follow t he manufacturers instructions for your recovery/recycling equipment. Failure to do so co u ld
cause personal injury or damage to your equipment. Never perform any maintenance or service on your
equipment before consulting with authorized service personnel. Always unplug unit before attempting any
maintenance. Removing internal fittings and filters can release pressurized refrigerant. Slowly release pressure
and always wear appropriate safety wear.
Avoid breathing any refrigerant vapor, lubricant vapor, or mist. Exposure to these, particularly PAG oil mist,
may irritate your eyes, no se, o r throat.
Always use a DOT ( D epartment o f Transportation) appro ved cylinder for storing used and recycled
refrigerant. Approved cylinders will be stamped DOT 4BW or DOT 4BA. MCC recommends a MACS (Mobile
Air Conditioning Society) certification in Recovery/Recycling to gain more information on handling and using
refrigerants.
Never attempt to apply heat or open flame to a refrigerant cylinder. High temperatures can raise the cylinder
pressure to dangerous levels. MCC r ecom men ds using a heat blanket to increase the internal t em perature of the
refrigerant cylinder, greatly increasing the transfer of refrigerant to the bus air conditioning system.
Never use compressed air (shop-air) to leak-test or pressure test a R134a system. Under certain conditions,
pressurized mixtures of R134a and air can be combustible. In addition, shop air will inject moisture into the
system.
Always u se mineral oil to lubricate “O” Rings, hoses, and fittings on R134a systems. PAG oils will absorb
moisture and become very acidic and corrosive. Mineral oil will not absorb moisture and thus prevent
corrosion. Always wear gloves when working with PAG and Ester lubricants to pr event irritation to your skin.
R134a lubricants can also damage vehicles paint, plastic parts, engine drive belts and coolant hoses.
Beware of unannounced starting of the evaporator and condenser fans. Do not remove the evaporator cover or
condenser fan guards without disconnecting the vehicle battery cable.
Be sure power is turned off before working on motors, controllers, and electrical control switches. Tag system
controls and vehicle b attery to prevent accidental energizing of th e system.
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