• Thoroughly inspect and clean interior and exterior of machine with vacuum cleaner, (remove panels).
• Clean drain pan and note excessive corrosion, prepare metal and paint as necessary.  Consult the Material Safety Data Sheet (MSDS) to ensure that the paint lead level is 0.06% or less.
• Check for refrigerant leaks using a halogen detector or similar testing device.  Repair all leaks before recharging unit.  If leaks are not able to be stopped or corrected, report leak status to supervisor.  Consult the MSDS for disposal requirements. 
• Check refrigerant levels for proper charge and recharge as needed.
• Check condition of cooling and reheat coils.  Use fin comb if needed to straighten fins.
• Clean coils, use coil cleaner detergent solution and high pressure water.
• Check belts for wear, adjust tension or alignment, and replace when necessary.
• Drain and clean humidifier drip pan, if applicable.  Remove corrosion; prime, and paint as needed.
• Lubricate motor and fan bearings, if not sealed.  Check alignment of motor and fan.
• Replace prefilters if needed.
• Replace final filters if needed.
• Check compressor oil level, if compressor has an oil sight glass.
• Run machine, check action of controls, relays, switches, etc., to see that:
o compressor(s) run at proper settings.
o reheat coils activate properly.
o humidistat activates humidifier.
o suction and discharge pressures are proper.
o discharge air pressure is set properly.
• Check and tighten any loose unit electrical terminals, disconnect switches, or connectors.
• Check and adjust vibration eliminators.  Replace if required.
• Clean surrounding area, record results and findings and report any needed repairs or operational adjustments.

• Obtain and review manufacturer's instructions.  Follow manufacturer’s instructions or procedures if different to these instructions or procedures.
• De-energize, lockout, and tag the electrical circuits.
• Comply with the latest provisions of the Clean Air Act and Environmental Protection Agency (EPA) regulations as they apply to protection of stratospheric ozone.
• No intentional venting of refrigerants is permitted.  During the servicing, maintenance, and repair of refrigeration equipment, the refrigerant must be recovered.
• Whenever refrigerant is added or removed from equipment
• Recover, recycle, or reclaim the refrigerant as appropriate
• If disposal of the equipment item is required, follow regulations concerning removal of refrigerants and disposal of the appliance
• If materials containing refrigerants are discarded, comply with EPA regulations as applicable.
• Refrigerant oils to be removed for disposal must be analyzed for hazardous waste and handled accordingly.
• Closely follow all safety procedures described in the Material Safety Data Sheet (MSDS) for the refrigerant and all labels on refrigerant containers.

• Safety goggles
• Gloves
• Standard and Phillips head screw drivers-various sizes
• Pliers-vise grip (2), slipjoint, needlenose, diagonal; cutting pliers, side cutters
• Ball peen hammer
• Hack saw and spare blades
• 3/8' drive socket set and ratchet
• Small set of Allen wrenches
• Assorted center punches
• Drift punches
• Steel chisel
• 12' measuring tape
• Crescent wrenches 4" to 8"
• Open and box end wrenches ¼" to ¾"
• File
• Pipe wrenches to 14"
• Small level and square
• Pocket knife
• Flashlights
• Grease guns and oilers
• Wire brush
• Extension cord and inspection lights
• Various cleaning tools - brushes, scrapers, etc; Emery cloth
• Refrigeration gauges
• Leak detector-electronic or halogen
• Pocket thermometer
• Clamp on meter (volt - ohm - amp meter)
• Flaring tool
• Tubing cutters
• Packing kit and packing
• Crescent wrenches to 14"
• Cleaning tools and materials
• Vacuum wet/dry
• Fin comb
• Grease gun and oil
• Filters and Pre-filters
• Spare belts
• Approved refrigerant.
• Paint and brushes as required.  Consult the MSDS to ensure that the paint lead level is 0.06% or less.
• Self sealing quick disconnect refrigerant hose fittings
• Refrigerant recovery/recycle unit
• Electronic leak detector