Carrier 69NT40-541-500 Operation And Service Manual
Also see for 69NT40-541-300: Operation and service
                                                                                                                                                                    | |
Contents
| 
T-363 7–2When the Suction Pressure Valve is open and the Discharge Pressure Valve is shut, the system can be chargedthrough the Utility Connection. Oil can also be added to the system.A R-134a manifold gauge/hose set with self-sealing hoses (see Figure 7.2) is required for service of the modelscovered within this manual. The manifold gauge/hose set is available from Carrier Transicold. (Carrier TransicoldP/N 07-00294-00, which includes items 1 through 6, Figure 7.2).If the manifold gauge/hose set is new or was exposed to the atmosphere, it will need to be evacuated to removecontaminants and air as follows:1. Backseat (turn counterclockwise) both field service couplings (see Figure 7.2) and midseat both handvalves.2. Connect the yellow hose to a vacuum pump and refrigerant 134a cylinder.3. Evacuate to 10 inches of vacuum and then charge with R-134a to a slightly positive pressure of 0.1kg/cm 2(1.0 psig).4. Frontseat both manifold gauge set valves and disconnect from cylinder. The gauge set is now ready for use.Figure 7.2 R-134a Manifold Gauge/Hose Set1. RED Refrigeration and/or EvacuationHose (SAE J2196/R-134a)2. Hose Fitting (0.5-16 Acme)3. YELLOW Refrigeration and/or EvacuationHose (SAE J2196/R-134a)4. Hose Fitting with O-ring (M14 x 1.5)5. High Side Field Service Coupling (Red Knob)6. BLUE Refrigeration and/or Evacuation Hose (SAEJ2196/R-134a)7. Low Side Field Service Coupling (Blue Knob)- - - - -7.3 SERVICE VALVESCompressor suction, compressor discharge, and liquid line service valves (see Figure 7.3) are provided with adouble seat and a gauge connection, which enables servicing of the compressor and refrigerant lines.Turning the valve stem clockwise (all the way forward) will frontseat the valve to close off the suction, discharge orliquid line and open the gauge port to the compressor or low side. Turning the stem counterclockwise (all the wayout) will backseat the valve to open the connections and close off the port.With the valve stem midway between frontseat and backseat, both of the service valve connections are open to theaccess valve path.For example, the valve stem is first fully backseated when connecting a manifold gauge to measure pressure.Then, the valve is opened 1/4 to 1/2-turn to measure the pressure.To Low SideAccess ValveTo High SideAccess Valve123245647 |
Related manuals for Carrier 69NT40-541-300
This manual is suitable for:
manualsdatabase
Your AI-powered manual search engine