FORM 145.32-IOM1 (908)

START-UP AND OPERATION

Prior to starting unit for the first time, turn the thermostat system switch to OFF - or raise the cooling setpoint to the highest temperature, to prevent the unit from starting. Close the electrical disconnect switch. This will energize the compressor crankcase heater(s). WAIT A MINIMUM OF FOUR HOURS BEFORE STARTING THE SYSTEM. This period will allow the crankcase heater to vaporize any liquid refrigerant in the compressor crankcase.

Start unit and check rotation of fans and compressors.

Scroll compressors will only compress in one rotational direction. Three phase compressors will rotate in either direction depending upon phasing of the power. Since there is a 50-50 chance of connecting power in such a way as to cause rotation in the reverse direction, it is important to ensure proper rotation direction is achieved when the system is installed and operated.

Verification of proper direction is made by observing that suction pressure drops and discharge pressure rises when the compressor is energized. Reverse rota- tion also results in an elevated sound level as well as substantially reduced current draw.

If opposite rotation is needed, disconnect and reverse any two leads of the three phase supply. Reconnect power and observe for correct rotation.

Observe unit operation and check for unusual noise or vibration.

REFRIGERANT CHARGES

Ref. Charge

2 TON

3 TON

4 TON

5 TON

No. of Circuits

1

1

1

1

Per Circuit (lb)

7.625

8.125

11.188

10.938

The Air Conditioning section of this equipment is charged with R-410A; a hi- pressure refrigerant. Only qualified techni- cians, using appropriately pressure-rated test instruments, should perform trouble- shooting or service on this equipment.

PRESSURE SWITCH SETTINGS

 

 

 

 

 

ALL MODELS

 

 

High

Low

Cut Out (PSIG)

600

55

Cut In (PSIG)

450

75

There is no negative impacts on durability caused by operating three phase Scroll compressors in the re- versed direction for a short period of time (less than one hour). However, after several minutes of operation the compressors internal protector will trip.

RECCOMENEDED REFRIGERANT LINE SIZES

UNIT SIZE

LESS THAN 60 LINEAR FEET

60 - 150 LINEAR FEET

LIQUID LINE

SUCTION LINE

LIQUID LINE

SUCTION LINE

 

2 TON

5/16

5/8

3/8

3/4

3 TON

3/8

3/4

3/8

7/8

4 TON

3/8

7/8

1/2

1-1/8

5 TON

3/8

1-1/8

1/2

1-1/8

8 TON

2 X 3/8

2 X 7/8

2 X 3/8

2 X 1-1/8

10 TON

2 X 3/8

2 X 1-1/8

2 X 1/2

2 X 1-1/8

12 TON

2 X 1/2

2 X 1-1/8

2 X 1/2

2 X 1-3/8

15 TON

2 X 1/2

2 X 1-1/8

2 X 5/8

2 X 1-3/8

NOTES: - Maximum Suction Lift 60 FT

-Maximum Liquid Line Rise 40 FT (measured from condensing unit level).

-Liquid Line Solenoid Valve required on systems over 100 linear feet.

-Suction Accumulator(s) required on systems over 125 linear feet.

Johnson Controls

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Energy Tech Laboratories DSH START-UP and Operation, Refrigerant Charges, Pressure Switch Settings
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DSH specifications

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