maintenance
Maintenance procedures
Maintenance Procedures
This section describes specific maintenance procedures that must be preformed as a part of the normal maintenance program. Always disconnect electrical power to the unit before performing these procedures and heed all warnings and cautions.
WARNING
Live Electrical Components!
During installation, testing, servicing, and troubleshooting this equipment, it may be necessary to work with live electrical components. Have a qualified licensed electrician or other individual who is properly trained in handling live electrical components perform these tasks. Failure to follow all electrical components could result in death or serious injury.
WARNING
Hazardous Voltage!
Disconnect all electrical power including remote disconnects before servicing unit. Follow proper lockout/tagout procedures to ensure power cannot be inadvertently energized. Failure to disconnect power before servicing can result in death or serious injury.
Periodic Maintenance Checklist
Inspect coil surface for cleanliness. Clean as required, referring to the “Coil Cleaning” section.
Annual Maintenance Checklist
Perform all monthly maintenance inspections.
Perform seasonal startup checks.
Leak test refrigerant circuits. Inspect contacts of fan motor contactors and relays. Replace all worn contacts.
Clean and repaint any corroded surface.
Note: the following coil cleaning proce- dures apply only to the outdoor condens- ers. Do not use these procedures for the reheat or evaporator coils.
Cleaning the Condenser Coils
Clean the coil at least once each year or more frequently if located in a dirty environment, to help maintain proper unit operating efficiency. High discharge pressures are a good indication that the coil needs cleaning. Follow the detergent manufacturer instructions as closely as possible to avoid potential coil damage.
WARNING
Hazardous Chemicals!
Coil cleaning agents can be either acidic or highly alkaline.Handle chemical carefully. Proper handling should include goggles or face shield, chemical resistant gloves, boots, apron, or protective suit as required. For personal safety, refer to the cleaning agent manufacturer’s materials safety data sheet and follow all recommended safe handling practices. Failure to follow all safety instructions could result in death or serious injury.
To clean the refrigerant coil, use a soft brush and sprayer, such as a garden pump up or high pressure type . In addition, use a quality detergent; like “SPREX AC’, “ OAKITE 161” or “OAKITE 166” and “COILOX.”
Note: If detergent is strongly alkaline (i.e. has a pH value greater that 8.5 ) after mixing, you must add an aluminum corrosion inhibitor.
WARNING
Hazardous Voltage!
Disconnect all electrical power including remote disconnects before servicing unit. Follow proper lockout/tagout procedures to ensure power cannot be inadvertently energized. Failure to disconnect power before servicing can result in death or serious injury.
Coil Cleaning Procedure
1.Disconnect power to the unit.
2.Remove panels from the unit to gain access to the coil.
3.Use a soft brush to remove loose dirt and debris form both sides of the coil.
4.Straighten coil fins with fin comb as required.
5.Mix the detergent with water according to the manufacturers instructions.
Observe all recommendations of the cleanser manufacturer. The coil cleanser manufacturer’s recommendations, warnings and cautions will at all times take precedence to these instructions.
1.Place solution in the sprayer. Be sure to follow these guidelines if using a high- pressure sprayer:
a)Keep minimum nozzle spray angle 15°.
b)Spray solution at a 90° angle to the coil face.
c)Keep sprayer nozzle at least six inches from the coil.
d)Sprayer pressure must not exceed
600 psi.
2.Spray leaving air side of the coil first then spray the entering air side of the coil. Allow the detergent and water solution to stand on the coil for five minutes.
3.Rinse both sides of the coil with cool, clean water.
4.Inspect the coil. If it still appears dirty, repeat the cleaning procedure.
5.Reinstall all unit components and panels, and restore electrical power and gas supply to the unit.
CAUTION
Freezing Temperatures!
Do not allow liquid refrigerant to come into contact with the skin. If it does, treat the injury similar to frostbite. Slowly warm the ffected area with lukewarm water and seek immediate medical attention. Direct contact with liquid refrigerant may cause minor or moderate injury.
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