Carrier bryant Multi-Zone 38MARBQ09 18AA3 Series Service Manual page 5

1 Steps for DLS Troubleshooting
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If system has no error but still not preforming well, remove the
refrigerant charge (weighing it out) and recharge the system.
Make sure to check the additional charge calculation if one is
needed.
If the end user's complaint is related to over or under shooting
temperature of the space, the sizing of the equipment to the
application should be checked. Keeping in mind the below.
• Minimum BTU output of the equipment
• Size of the head and the BTU requirements
of the space it is located within.
In some cases the Heating or Cooling Compensation setting can
be adjusted to help off set the temperature over or under
shooting. Explanation and instructions are in this guide.
For Defrost issues the following should be checked first.
• Refrigerant charge
• Equipment sizing to the application
For Defrost issues on systems with a 24-Volt Interface installed
Any outdoor unit made prior to 2.01.2021 may need a main
PCB upgrade. If your unit's serial number starts 0421V or lower
an upgrade may be needed. Check with CE Tech Support.
(cont.)