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TR NG I H C S PH M K THU T TP.HCMƯỜ ĐẠ Ọ Ư Ạ Ỹ Ậ KHOA: C KHÍ NG L CƠ ĐỘ Ự B MOÂN: COÂNG NGH NHI T - I N L NHỘ Ệ Ệ Đ Ệ Ạ  GVHD : TS. LÊ XUÂN HÒA SVTH : Chương Cún Sáng Phan Phú Quí Ngô Minh Tân Lê Hoàng Phúc CHUYÊN ĐỀ LẠNH High Pressure Cutout Manifold Condenser Fan and Evaporator Fan Rotation Electric Heaters Evaporator Fans Condenser Fan High Pressure Cutout Manifold 1. Connect the manifold gauge to the compressor discharge service valve with a heavy duty, black jacketed thick wall #HCA 144 hose with 6024 kPa, 60.24 bar, 900 psig working pressure rating. 3. Raise the discharge pressure of the compressor by blocking the condenser coil airflow. Temporarily cover the compressor compartment, control box and power cord storage compartment with cardboard to reduce condenser coil airflow. This should increase the discharge pressure enough to cause the switch to open. When the switch opens: 2. Operate the unit in Cool by performing a REFRG/FC HI (full cool with high speed evaporator fan) test from the Test menu of the μP-D controller. • The Alarm LED should turn On. • The compressor and evaporator fans should STOP immediately. • The condenser fan should continue to operate. NOTE: The discharge pressure should never be allowed to exceed 2,760 kPa, 27.6 bar, 400psig. 4. Be sure to remove the cardboard installed in step 3. WARNING: When alarm codes are cleared by pressing the ENTER key, the unit will start automatically. If the HPCO switch fails to stop compressor operation, replace the switch and repeat steps 1 through 4. NOTE: To clear the HPCO alarm, press the ALARM key on the controller. Press the DOWN key until ENTER flashes in the left display. Then press the ENTER key. The Alarm LED should turn Off and the unit restart. Condenser Fan and Evaporator Fan Rotation Condenser Fan Check for proper condenser fan rotation by placing a small cloth or sheet of paper against the condenser fan grille on the front of the unit. Proper rotation will blow the cloth or paper away from the grille. Improper rotation will hold the cloth or paper against the grille.  NOTE: If unit operating conditions do not require condenser fan operation, check the condenser fan rotation by performing an AMPS/CFH (high speed condenser fan) test from the Test menu of the μP-D controller. If the condenser fan is rotating backwards, refer to the unit wiring diagram to correct fan motor wiring at the fan motor junction box or condenser fan contactor. To correct improper fan rotation, reverse any two fan power cord leads at the condenser fan contactor (disconnect power supply before reversing leads). Do not move the CH ground wire. Evaporator Fans Visually inspect the evaporator fan blades for proper rotation. Arrows located on the underside of the fan deck indicate the correct direction of rotation. NOTE: Check both High and Low Speed evaporator fan rotation by performing an AMPS/EFH (high speed evaporator fan) test and AMPS/EFL (low speed evaporator fan) test from the Test menu of the μP-D controller. If an evaporator fans rotate backwards on one or both speeds, refer to the unit wiring diagram to correct motor wiring at the fan motor junction box or evaporator fan contactor (disconnect power supply before reversing leads). (Do not move the ground wire which is labeled CH.) NOTE: Evaporator fan motor wires EF1, EF2 and EF3 are used on LOW SPEED fan operation. Wires EF11, EF12 and EF13 are used on HIGH SPEED fan operation. [...]...NOTE: To diagnose the controller phase selection system if both the condenser fan and evaporator fans are rotating backwards, see the Diagnosis Manual for ThermoGuard μP-D Microprocessor Controller đảo dây nối đất CH Electric Heaters Six electric heater elements are located underneath the evaporator coil If a heater element is suspected of malfunctioning, inspect the connections: . Visually inspect the evaporator fan blades for proper rotation. Arrows located on the underside of the fan deck indicate the correct direction of rotation conditions do not require condenser fan operation, check the condenser fan rotation by performing an AMPS/CFH (high speed condenser fan) test from the Test