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Horizon™ Dedicated Outdoor Air Systems: Monthly Maintenance

This procedure is the recommended monthly maintenance procedure for your equipment. Performing all maintenance procedures and inspection at the recommended intervals will prolong the life of your chiller and minimize the possibility of malfunctions.
MaintainX
10/24/2021

Horizon™ Dedicated Outdoor Air Systems: Monthly Maintenance

5 steps
This procedure is the recommended monthly maintenance procedure for your equipment. Performing all maintenance procedures and inspection at the recommended intervals will prolong the life of your chiller and minimize the possibility of malfunctions.
  • Monthly Maintenance

  • Before completing the following checks, turn the unit OFF and lock the main power disconnect switch open.

  • ! WARNING

  • Hazardous Voltage!

  • Failure to disconnect power before servicing could result in death or serious injury. Disconnect all electric power, including remote disconnects before servicing. Follow proper lockout/tagout procedures to ensure the power can not be inadvertently energized. Verify that no power is present with a voltmeter.

  • Filters

  • Inspect the return air filters. Clean or replace them if necessary. Refer to the unit Service Facts for filter information.

  • Return Air Smoke Detector Maintenance

  • Airflow through the unit is affected by the amount of dirt and debris accumulated on the indoor coil and filters.

  • To insure that airflow through the unit is adequate for proper sampling by the return air smoke detector, complete adherence to the maintenance procedures, including recommended intervals between filter changes, and coil cleaning is required.

  • For detailed instructions concerning these checks and procedures, refer to the appropriate section(s) of the smoke detector Installation and Maintenance Instructions provided with the literature package for this unit.

  • Periodic checks and maintenance procedures must be performed on the smoke detector to insure that it will function properly

  • Condensate Overflow Switch

  • During maintenance, the switch float (black ring) must be checked to ensure free movement up and down.

  • Cooling Season

  • With the unit running, check and record the following:

  • Record this data on an “operator’s maintenance log” like the one shown in Sample maintenance log table in Final Process Section. If the operating pressures indicate a refrigerant shortage, measure the system superheat and system subcooling. For guidelines, refer to “Compressor Start-Up,” p. 34.

  • Important: Do not release refrigerant to the atmosphere! If adding or removing refrigerant is required, the service technician must comply with all federal, state and local laws. Refer to general service bulletin MSCU-SB-1 (latest edition).

  • Heating Season

  • Coil Cleaning

  • Regular coil maintenance, including annual cleaning enhances the unit’s operating efficiency by minimizing the following:

  • Microchannel (MCHE) Coils

  • ! NOTICE

  • Coil Damage!

  • Failure to follow instructions below could result in coil damage. DO NOT use any detergents with microchannel condenser coils. Use pressurized water or air ONLY, with pressure no greater than 600psi.

  • The recommended cleaning method for microchannel condenser coils is pressurized water or air with a nonpinpoint nozzle and an ECU of at least 180 with pressure no greater than 600 psi. To minimize the risk of coil damage, approach the cleaning of the coil with the pressure washer aimed perpendicular to the face of the coil during cleaning.

  • Round Tube Plate Fin (RTPF) Coils

  • To clean refrigerant coils, use a soft brush and a sprayer (either a garden pump-up type or a high-pressure sprayer). A high-quality detergent is also required; suggested brands include “SPREX A.C.”, “OAKITE 161”, “OAKITE 166” and “COILOX”. If the detergent selected is strongly alkaline (ph value exceeds 8.5), add an inhibitor.

  • For evaporator coil cleaners, contact the local Trane Parts Center for appropriate detergents.

  • Final Process

  • For future reference, you may find it helpful to record the unit data requested below in the blanks provided.

  • For future reference, you may find it helpful to record the unit data requested below in the blanks provided.

  • Table 9. Sample maintenance log

Please note that any procedure, checklist, or other document available in the MaintainX Global Procedure Library is provided for general education and information only and does not constitute legal, medical, or financial advice. MaintainX makes the materials available AS IS and AS PROVIDED, without warranties of any kind. By downloading or using any such materials, you assume the risk that they may not be appropriate for your specific situation and agree that you are solely responsible for any such use, including compliance with applicable law and with meeting any conditions of product warranties.