Carrier 380B- Manuals

Table 6 — Service Data Refrigerant Charging — The 38QB units contain correct operating charge for complete system when connected to28HQ,VQ,40QB or 40AQ indoor units with 25 ft (7.6 m) of tubing of recommended diam­ eter. Charge adjustment is required on other sys­ tems. Adjust system charge for refr...

6. From intersect point, project vertically down­ ward to chart suction pressure line. Compare chart suction pressure to unit suction pressure (Step 2). 7. If unit suction pressure is lower than chart pres­ sure, add refrigerant to system until chart pressure is reached. If unit suction pressure is ...

connect high- and low-voltage power wiring; and replace louvered casing. 13. Replace top cover by running 4 screws into orifice loosely (2 on each side of unit) and tighten when cover is in place. Replace remain­ ing screws. 14. Evacuate and recharge system. CHARGING AND PRESSURE CHECK CHARTS PSIG (...

With a low-side leak there is always some pressure in the liquid line. However, compressor motor tem­ perature increases because of insufficient suction gas cooling. This causes internal thermostat to actuate and stop compressor. When compressor stops, system pressure equalizes and contacts on press...