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WeatherMaster® Single-Packaged Rooftop Units 48P: Quarterly Maintenance

This procedure is for the quarterly maintenance of your unit. It focuses on main burners, moisture and liquid indicator.
MaintainX
05/03/2021

WeatherMaster® Single-Packaged Rooftop Units 48P: Quarterly Maintenance

3 steps
This procedure is for the quarterly maintenance of your unit. It focuses on main burners, moisture and liquid indicator.
  • MAIN BURNERS (48P ONLY)

  • At the beginning of each heating season, inspect for deterioration due to corrosion or other causes. The main burner assembly is shown in Fig. 46 for 2-stage heat and staged gas heat. For modulating gas heat, see Fig. 47. Refer to Main Burners Removal and Replacement section on page 186 for burner remov- al sequence. Observe the main burner flames and adjust if nec- essary. See Gas System Adjustment section on page 186.

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  • MAIN BURNERS

  • For all applications, main burners are factory set and should require no adjustment.

  • MAIN BURNER REMOVAL AND REPLACEMENT:

  • Moisture/Liquid Indicator

  • A clear flow of liquid refrigerant indicates sufficient charge in the system. Bubbles indicate undercharged system or the pres- ence of noncondensables. Moisture in the system measured in parts per million (ppm) changes the color of the indicator.

  • Green — moisture below 45 ppm (dry) Chartreuse — 45 to 130 ppm (caution!) Yellow — moisture above 130 ppm (wet)

  • Change filter driers at the first sign of moisture in the system. See Carrier Charging Handbook for more information.

  • IMPORTANT: Unit must be in operation at least 12 hours before moisture indicator can give an accurate reading. With unit running, indicating element must be in contact with liquid refrigerant to give a true reading.

  • Filter Drier

  • Replace whenever the moisture/liquid indicator shows moisture in the system.

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