Section 14. System Charge Adjustment - Trane 5TTX5018 Installation And Operation Manual

Section 14. System Charge Adjustment

14.1 Temperature Measurements (Systems can be rated with TXV, EEV or Piston. Ensure charging method
is correct).
Important: Installer must mark/write the total refrigerant charge on the OD unit label after adjusting for indoor
coil and lineset. Technicians must have their refrigerant cylinder on a scale during the charging procedure and
measure how much additional refrigerant is put in the system (additional over the factory charge). The additional
charge must be recorded on the label provided on the outdoor unit as well as the resulting total system charge.
Important: Standard service trucks and vans may not carry more than six 25# cylinders (< 220 lb of A2L refriger-
ant total)
Important: A2L approved equipment required for leak detection, charge and recovery.
Important: Ensure that contamination of different refrigerants does not occur when using charging equipment.
Important: A set of calibrated weighing scales shall be available and in good working order. Hoses shall be com-
plete with leak-free disconnect couplings and in good condition. Ensure any associated electrical components
are sealed.
STEP 1 - Check the outdoor temperatures.
Subcooling (in cooling mode) is the only recommended* method of charging above 55º F ambient outdoor tem-
perature.
Note: For Superheat (In Cooling Mode), refer to the Superheat Charging Table on page 18.
*Weigh-In Method can be used for initial installation, or system replacement when power is not available or
when the desired temperatures for the standard charging method are outside normal bounds. See Section 14.3.
For best results the indoor temperature should be kept between 70º F to 80º F.
Note: It is important to return in the spring or summer to accurately charge the system in the cooling mode when
outdoor ambient temperature is above 55º F.
14.2 Subcooling Charging in Cooling (Above 55º F Outdoor Temp.)
STEP 1 - Use the refrigerant line total length
and lift measurements from Section 5.3.
Total Line Length = __________ Ft.
Vertical Change (Lift) = __________ Ft.
12
LIFT
18-AC130D1-1B-EN