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WeatherMaster® Single-Packaged Rooftop Units 48P: Periodical Maintenance (bi-monthly)

This procedure if for the periodical (bi-monthly) cleaning of your equipment. Periodical cleaning assures proper airflow and heating efficiency.
MaintainX
10/24/2021

WeatherMaster® Single-Packaged Rooftop Units 48P: Periodical Maintenance (bi-monthly)

6 steps
This procedure if for the periodical (bi-monthly) cleaning of your equipment. Periodical cleaning assures proper airflow and heating efficiency.
  • COMBUSTION-AIR BLOWERS (48P ONLY)

  • Clean periodically to assure proper airflow and heating efficiency. Inspect blower wheel every fall and periodically during heating season. For the first heating season, inspect blower wheel bi-monthly to determine proper cleaning frequency.

  • To inspect blower wheel:

    Screenshot2021-01-19at2.33.28PM.png
  • SUPPLY FAN AND POWER EXHAUST MOTOR PLATE

  • Adjust using a 15/16-in. wrench on the adjusting bolts:

    Screenshot2021-01-19at2.38.25PM.png
  • IMPORTANT: When installing or replacing belts, always use a complete set of new, matched belts to prevent potential vibration problems. Mixing belts often results in premature breakage of the new belts.

  • BELT INSTALLATION AND TENSIONING:

  • NOTE: Check the tension at least twice during the first day of operation, as there is normally a rapid decrease in tension until the belts have run in. Check tension periodically thereafter and keep it at the recommended tension.

  • With the correct belt tension, belts may slip and squeal momentarily on start-up. This slippage is normal and disappears after wheel reaches operating speed. Excessive belt tension shortens belt life and may cause bearing and shaft damage.

  • PULLEY ALIGNMENT

  • For proper belt life, the motor and fan pulleys must be properly aligned. To check, first turn off unit power. Place a straightedge against the motor and fan pulleys. See Fig. 52. If the pulleys are properly aligned, the straightedge should be parallel to the belts.

  • If they are not parallel, check that the motor shaft and fan shaft are parallel. If they are not, adjust the motor plate adjusting bolts until they are.

  • After verifying that the shafts are parallel:

  • INSTALLING REPLACEMENT MOTOR PULLEY (SUPPLY FAN ONLY)

  • To install a field-supplied replacement pulley:

  • CONDENSER FAN ADJUSTMENT (ALL UNITS EXCEPT SIZE 035)

    Screenshot2021-01-19at2.53.33PM.png

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