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High Pressure Cutout ManifoldCondenser Fan and Evaporator Fan Rotation Electric Heaters Evaporator Fans Condenser Fan... Operate the unit in Cool by performing a REFRG/FC HI full coo

TR ƯỜNG ĐẠI HỌC SƯ PHẠM KỸ THUẬT TP.HCM NG ĐẠI HỌC SƯ PHẠM KỸ THUẬT TP.HCM I H C S PH M K THU T TP.HCM ỌC SƯ PHẠM KỸ THUẬT TP.HCM Ư ẠI HỌC SƯ PHẠM KỸ THUẬT TP.HCM Ỹ THUẬT TP.HCM ẬT TP.HCM

KHOA: C KHÍ Ơ KHÍ ĐỘNG LỰC ĐỘNG LỰC NG L C ỰC

B MOÂN: COÂNG NGH NHI T - I N L NH ỘNG LỰC Ệ NHIỆT - ĐIỆN LẠNH Ệ NHIỆT - ĐIỆN LẠNH Đ Ệ NHIỆT - ĐIỆN LẠNH ẠI HỌC SƯ PHẠM KỸ THUẬT TP.HCM



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 P-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

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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.P-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.P-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 controller.P-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:

• If the connections appear correct and secure,

isolate and check the resistance of each individual heater element by disconnecting it from the circuit

• Check resistance with an ohmmeter

NOTE: When repairing heater connections, protect the new connections from the ingress of moisture

with heat shrink tubing All heaters should be

secured to prevent contact with sharp metal edges

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