Movincool CLASSIC40 Service Manual

Fig. 1-1 Circuit of Auxiliary Relay

GENERAL DESCRIPTION

1. GENERAL DESCRIPTION

Generally speaking conventional air conditioners cool the entire enclosed environment. They act as “heat exchangers”, requiring an interior and an exterior unit (condenser) to exhaust exchanged heat to the outdoors.

Unlike conventional air conditioners, the SPOT COOL is a cooling system which directs cool air to particular areas or objects.

SPOT COOL has the following features;

1) Compact Design

The innovative design of SPOT COOL has resulted in one compact design, replacing the need for two separate units.

Fig. 1-2 Air Flow of Spot Cool

2) Easy Installation

With the whole cooling system built into one compact unit, SPOT COOL requires no pipe work for refrigerant and installed easily. In this case, cooling air duct work is required.

3) Energy Conservation

SPOT COOL is economical because it cools only the area or objects which need to be cooled, not the entire room.

CONSTRUCTION, SPECIFICATIONS and DATA

2. CONSTRUCTION AND SPECIFICATION

2-1. Construction

Fig. 2-1 Construction of Hermetric Rotary Type Compressor

CONSTRUCTION, SPECIFICATIONS and DATA

1) Basic Construction

The SPOT COOL is compact in construction because the condenser and the evaporator are enclosed in one unit. The interior is divided into two sections. The front face is equipped with the evaporator and control box. The rear section contains the condenser and the compressor.

2) Air Flow (See Fig. 1-2)

1. Air flow for the condenser Air is taken through apertures in the rear face and both sides of unit to cool the condenser and discharged through the exhaust air duct at the top of unit.

2. Air flow for the evaporator Air is taken from the front face of unit, cooled via the evaporator, and blown off from the aperture in the unit top. Using a cooling air duct (option, to be installed on the field), blow cool air against an object to be cooled. All air inlets are provided with air filters.

CONSTRUCTION, SPECIFICATIONS and DATA

2-2 Specifications

Item Model 30HU

[Rating Condition] DB 35˚C WB28.2˚C

95˚F 83˚F

(60%) [Features]

Power frequency ..................................................... (Hz) 60

Line Voltage .......................................................... (Volt) Three phase 220

Power consumption ............................................... (Kw) 4.7

Current consumption .......................................... (Amp) 70

Power factor ........................................................... (%) 88

Starting current ................................................... (Amp) 70

Power wiring .......................................................(AWG) 12 (4-core)

[Cooling Unit]

Cooling capability ............................................. (Kcal/h) 9830

(Btu/h) 39000 Cooling system Direct expansion [Blower] Type of fan Sirroco fan

Air volume ...........................................................(m3/h) 1800

(ft3/min) 1060

Motor output .......................................................... (Kw) 0.75

[Compressor] Type Hermetic

reciprocating type

Output .................................................................... (Kw) 2.2

Refrigerant R-22

(kg) 2.0

Packed amount of refrigerant ................................ (lbs) 4.4)0

[Safety Device] Overcurrent relays (for compressor, evaporator fanwith motor and condenser fan motor) Compressor overload relay with Fan motor protectors (for evaporator and condenser)with High pressure switch with Anti-freezing thermostat with [Dimensions and Weight]

W x D x H .............................................................. (mm) 12100 x 650 x 985

(inch) 43.3 x 25.6 x 38.8

Weight ..................................................................... (kg) 160

(lbs) 353 [Operating Conditions] Inlet air MAX. 45˚C (113˚F), 50%

MIN. 25˚C (77˚F), 50%

Fig. 2-1 Construction of Hermetric Rotary Type Compressor

REFRIGERANT SYSTEM

3. REFRIGERANT SYSTEM

The component parts of the refrigerant system include the followings;

• Compressor • Evaporator

• Condenser • Modulating tank

• Capiliary tub • High pressure switch

These parts are all connected by copper piping. All the connections have been brazed.

Fig. 3-1 Refrigerant system of MODEL 30HU

REFRIGERANT SYSTEM

3-1. Compressor

The compressor used for this unit is a reciprocating type. It is a hermetic compressor which incorporates a drive motor and a compression mechanism in an enclosed vessel.

3-1-1. Construction

The reciprocating type compressor consists of a drive section (motor) and a compressin mechanism as shown in Fig. 3-2. When the rotor shaft of motor rotates, the crank shaft causes the piston to reciprocate in the cylinder and absorb and compress the refrigerant. Main components are the motor, crank case, bearing, crank shaft, cylinder, piston, etc. The motor and compression mechanism are supported by a spring inside the outer shell so that vibration of the compressor does not transmit directly to the outside. The out shell is on the low pressure side, in which gas flows from the evaporator. This gas cools the motor and compression mechanism.

Fig. 3-2 Construction of Hermetic Reciprocating Type Compressor

Fig. 3-3 Suction

REFRIGERANT SYSTEM

3-1-2. Operation

1) Suction

When the piston is pushed down, pressure inside the cylinder lowers. When this pressure becomes less than the suction side (low pressure side) pressure, the suction valve at the top of the cylinder is pushed open by the suction side pressure and the refrigerant is sucked into the cylinder. See Fig. 3-3.

2) Compression

The refrigerant in the cylinder is pushed up by the piston. As its capacity reduces, its pressure increases gradually. See Fig. 3-4.

Fig. 3-4 Compression

Fig. 3-5 Discharge

3) Discharge

When the refrigerant pressure in the cylinder becomes higher than the pressure on the delivery side (hight pressure side) of the compressor, the discharge valve opens to deliver the compressed refrigerant to the discharge side. See Fig. 3-5.

3-1-3. Lubrication of Compressor

In the lubrication system, lubricant from the thrust pad hole enters an eccentric hole in the crank shaft. Here, forced by centrifugal force, the lubricant rises the eccentric hole, enters the spiral groove in the shaft, and rises while simultaneously lubricating the bearing and subsequent areas.

Fig. 3-6 Lubrication of Compressor

REFRIGERANT SYSTEM

3-2. Condenser

The condenser, which serves as a heat exchanger, has thin aluminum projections called spine fins fastened toa copper tube. Heat is exchanged by forcing cooler air across the condenser fins.

3-3. Capillary Tube

The following table shows the specifications of the capillary tube.

Model Qty Purpose of Use I.D, (mm) Length (mm)

30HU 4 FOR COOLING Ø1.4±0.02 445

3-4. Evaporator

The evaporator is a heat exchanger using plate-fins and tubes. It is mounted at the front face of the unit, located on the suction side of the blower.

Fig. 3-7 Modulating Tank

REFRIGERANT SYSTEM

3-5. Modulating Tank

The modulating tank consists of a copper pipe and tank sections, each being separated from the other. The pipe connects to the evaporator outlet at one end and to the suction pipe of the compressor at the other; the tank connects to the evaporator inlet.

The modulating tank is covered with a heat insulator that eliminates thermal effects from ambient temperature. It varies the quantitiy of refrigerant in the refrigerating cycle for optimum operating condition: it stores part of refrigerant under light load and delivers additiona refrigerant to the cycle under heavy load.

3-6. High Pressure Switch

The high pressure switch prevents the condenser and compressor from being damaged by an excessively high pressure in the highpressure end of the refrigerating cycle, i.e., the refrigerant condensing pressure.

Fig. 3-8 High Pressure Switch

The switch is normally closed. The diaphragm detects variations in pressure and, as the pressure increases, the snap disk snaps back to pucsh the pin down, causing the internal contacts to open. This generates a signal to open the auxiliary relay.

Possible causes of this trouble include:

1) The condenser air filter is seriously contaminated and clogged.

2) Defective condense blower.

REFRIGERANT SYSTEM

3-7. Piping

The parts of the cooling system are connected by copper pipe.

In the unit, the refrigerant cycle is enclosed. Each connection has been brazed. the circled portion in the figure shows the parts which have been brazed.

Fig. 3-9 Refrigerant System Piping for MODEL 30HU

4. ELECTRICAL SYSTEM

The component parts of the electrical system include the following:

• Control box • Overcurrent relays

• Control switch • Relays

• Fan motor • Lamps etc.

• Compressor motor

ELECTRICAL SYSTEM

Fig. 4-1 Electrical System for MODEL 30HU

ELECTRICAL SYSTEM

4-1. Control Box

The interior of the control box is shown in the figure below.

Fig. 4-2 Main Control Box

Fig. 4-3 Sub Control Box

Fig. 1-1 Circuit of Auxiliary Relay

ELECTRICAL SYSTEM

4-1-1. Auxiliary Relay

When the power is supplied to the unit, this relay is energized across terminals 7 and 8 closed across terminals 5 and 3 and across 6 and 4. These states remain unchanged in all operation modes (FAN or COOL). If one of the errors mentioned below has occurred at the unit, the auxiliary relay is deenergized across terminals 7 and 8, and opened across terminals 5 and 3 and across 6 and 4. This shuts off power to the fan motor relay and compressor motor relay and accordingly brings the unit to a stop. Also, the relay is closed across terminals 6 and 2 to turn on the warning lamp.

1. Abnormally large current has flown in the evaporator fan motor.

Specifications

Rated Voltage: AC230 volts

Rated current: 10 Amps

UL Recognized; file E43028

2. Abnormally large current has flown in the condenser fan motor.

3. Abnormally large current has flown in the compressor motor.

4. Compressor motor temperature has risen abnormally.

5. High pressure has risen abnormally.

Fig. 1-1 Circuit of Auxiliary Relay

ELECTRICAL SYSTEM

4-1-2. Fan Motor Relay

This fan motor relay is closed when the unit is in operation of FAN and COOL mode, and supply power to the fan motor of the evaporator. In the following case, the relay opens to cut off power to the fan motor.

When the auxiliary relay is opened by the overcurrent relay OFF, compressor overlaod relay OFF or high pressure switch OFF.

Specifications

Rated Voltage: AC230 Volts

Rated current: 15 amps

UL listed file No.:E43028

Fig. 4-6 Circuit of Fan Motor Relay

4-1-3. Compressor Relay

This compressor relay is closed when the unit is in operation of only COOL mode and supply power to the compressor. In the following case, the relay opens to cut off power to the compressor.

When the auxiliary relay is opened by the high pressure switch OFF, overcurrent relay OFF or compressor overload relay OFF.

When the evaporator is freezed. (Thermostat OFF)

Specifications

Rated Voltage: AC230 Volts

Rated current: 30 amps

UL listed file No.:E43028

Fig. 4-7 Fan Motor Relay

Fig. 4-8 Circuit of Compessor Relay

Fig. 4-9 Compressor Relay

ELECTRICAL SYSTEM

4-1-4. Overcurrent Relay

For three-phase blower motor and compressor motor, an overcurrent relay is usually used as a safety device. The overcurrent relay prevents motor coil from burning if overcurent has flown into the motor due to abnormal load applied to the blower motor or compressor motor, extraordinary change in supply voltage, or loss of current in one phase. If overcurrent flows into the heating coil would around the bimetal strip, the bimetal strip curls, thereby opening the output contact (across terminals 95 and 96). This output contact shuts off the auxiliary relay circuit and brings the unit to a stop.

Fig. 4-10 Internal Construction of Over Current Relay

Fig. 1-1 Circuit of Auxiliary Relay

UL recognized: File E78841

Current Setting

For compressor motor 16A

For evaporator fan motor 2.8A

For condenser fan motor 2.0A

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