Heating Mode Charge - Carrier 50ZHK Installation Instructions Manual

50ZHK: Installation Instructions
5. Measure indoor air (return air) wet-bulb temperature with a sling
psychrometer or electronic equivalent.
6. Using Superheat Charging Table
and indoor air wet-bulb temperature. At this intersection note
superheat. Where a dash (--) appears on table do not attempt to
charge unit under these conditions or refrigerant slugging may
occur. In this situation refrigerant must be evacuated and weighed
in. See rating plate for charge quantity.
7. Refer to Required Suction Tube Temp. Table
superheat temperature located in Step 6 and suction pressure. At
this intersection note suction line temperature.
8. If unit has a higher suction line temperature than charted
temperature, add refrigerant until charted temperature is reached.
9. If unit has a lower suction line temperature than charted
temperature, reclaim refrigerant until charted temperature is
reached.
10. If outdoor air temperature or pressure at suction port changes,
charge to new suction line temperature indicated on chart.
048-060 Units, Indoor TXV
1. Measure Discharge line pressure by attaching a gauge to the service
port.
2. Measure the Liquid line temperature by attaching a temperature
sensing device to it.
3. Insulate the temperature sensing device so that the Outdoor
Ambient doesn't affect the reading.
4. Refer to the required Subcooling in
and the Outdoor Ambient temperature.
5. Interpolate if the Outdoor ambient temperature lies in between the
table values.
6. Find the Pressure Value in the table corresponding to the measured
Pressure of the Compressor Discharge line.
7. Read across from the Pressure reading to obtain the Liquid line
temperature for a required Subcooling.
8. Add Charge if the measured temperature is higher than the table
value.
9. Remove charge if the measured temperature is lower than the table
value.

Heating Mode Charge

Do not attempt to adjust charge by cooling methods while in heat pump
heating mode. Recover refrigerant and weigh in according to unit data
plate refrigerant data.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
(Table 3) find outdoor temperature
(Table 3). Find
Table 4 based on the model size
10