Heatcraft Refrigeration Products none Discharge Lines, Electrical Wiring, Tons of Refrigeration

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Discharge Lines

The proper design of discharge lines involves two objectives:

1. . To minimize refrigerant pressure drop, since high pressure losses cause increased compressor horsepower per ton of refrigerant..

2. . To maintain sufficiently high gas velocity to carry oil through to the condenser coil and receiver at all loading conditions..

Table 1. Tons of Refrigeration

Line Size

Type L Copper

OD

 

 

Discharge Line

 

 

 

Drain Line

R-22 Sat. Suction Temp (°F)

R-404A/R-507 Sat. Suction Temp (°F)

Velocity 100 FPM Refrigerant

 

 

-40

0

40

-40

0

40

R-22

R-404A

1/2

0..75

0..8

0..85

0..56

0..63

0..7

2..3

1..5

 

 

 

 

 

 

 

 

 

5/8

1..4

1..5

1..6

1..0

1..2

1..3

3..7

2..3

 

 

 

 

 

 

 

 

 

7/8

3..7

4..0

4..2

2..7

3..1

3..4

7..8

4..9

1-1/8

7..5

8..0

8..5

5..5

6..3

7..0

13..2

8..3

 

 

 

 

 

 

 

 

 

1-3/8

13..1

14..0

14..8

9..6

10..9

12..1

20..2

12..6

 

 

 

 

 

 

 

 

 

1-5/8

20..7

22..0

23..4

15..2

17..2

19..1

28..5

17..9

2-1/8

42..8

45..7

48..5

31..4

35..6

39..5

49..6

31..1

 

 

 

 

 

 

 

 

 

2-5/8

75..4

80..4

85..4

55..3

62..8

69..5

76..5

48..0

 

 

 

 

 

 

 

 

 

3-1/8

120..2

128..2

136..2

87..9

99..8

110..5

109..2

68..4

3-5/8

178..4

190..3

202..1

130..5

148..1

164..0

147..8

92..6

 

 

 

 

 

 

 

 

 

4-1/8

251..1

267..8

284..4

183..7

208..4

230..9

192..1

120..3

 

 

 

 

 

 

 

 

 

Source: ASHRAE Refrigeration Handbook:

1. .Line sizes based on pressure drop equivalent to 1°F per 100 equivalent feet..

2. .Values in Table are based on 105°F condensing temperature. .MultiplyTable capacities by the factors in Table 2 for other condensing temperatures..

3. .If subcooling is substantial or the line is short, a smaller line size may be used. .Applications with very little subcooling or very long lines may require larger sizes

Table 2. Condensing Temperature Correction Factor

Condensing Temperature

Discharge Line

R-22

R-502

R-404A

R-507

R-407C

R-410A

R-134A

90

0..88

0..91

0..922

0..924

0..872

0..889

0..882

 

 

 

 

 

 

 

 

100

0..95

0..97

0..974

0..975

0..957

0..963

0..961

 

 

 

 

 

 

 

 

110

1..04

1..02

1..009

1..005

1..036

1..032

1..026

 

 

 

 

 

 

 

 

120

1..10

1..08

1..026

1..014

1..009

1..096

1..078

 

 

 

 

 

 

 

 

130

1..18

1..16

1..043

1..024

1..182

1..160

1..156

 

 

 

 

 

 

 

 

Electrical Wiring

The electrical installation should be in accordance with National Electrical Code, local codes and regulations. .Proper overcurrent protection should be provided for the fan motors...

.

All standard motors have internal inherent overload protectors. . Therefore, contactors can be used instead of starters requiring thermal protectors, eliminating the problem of furnishing the proper heating elements...

.

All air-cooled condensers are furnished with either single-phase or three-phase fan motors which are identified by the unit dataplate...

.

Electrical leads from each motor terminate at the unit junction box. .Field connections must be made from these leads in accordance with local, state and national codes...

.

Three-phase motors must be connected to three-phase power of voltage to agree with motor and unit dataplate...

.

The motors are wired into a common junction box. .Where fan cycling is furnished and factory installed, the motors are completely wired through the control and to the contactors. .The motors must be checked for proper rotation. .Be sure to check that motor voltage and control connection agree with electric services furnished..

WARNING: There may be more than one source of electrical current in this unit. .Do not service before disconnecting all power supplies..

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Contents Air-Cooled Condensers Installation Operation Guide Inspection System WarrantyInstallation Sound VibrationDrawing 1. Rigging Instructions Multiple Units Space and Location RequirementsWalls or Obstructions Units in PitsInstallation, Refrigerant Piping Typical ArrangementsDischarge Lines Electrical WiringCondensing Temperature Correction Factor Tons of RefrigerationPage Fan Cycling Discharge Gas PulsationWinter Operation Head Pressure Control Variable Speed Fan Cycling Head Pressure ControlsFlooding Head Pressure Controls Splitting ControlsMechanical Fan Cycling Thermostat Settings Minimum Ambient for Fan CyclingElectronic Fan Cycling Thermostat Settings Pressure ChartRefrigerant Charge. Lbs. R-22 for Flooded Condenser Model Summer ChargeFlooded Charge Temperature Difference Factor MaintenanceCleaning Instructions Model Cross ReferenceParts by InterLink InterLink Condenser Parts ListIn-Warranty Return Material Procedure Fan Motor PartSeries Motors with Integrated Variable Speed Speed Adjustment CharacteristicsExternal Control Signal Be sure that the unit is isolatedMinimum Output Reverse acting or direct acting mode of operationHead Pressure Setpoint Throttling rangePhase failure Master/Slave ConfigurationProtective Features EC Motor WiringFAN 1 Header FAN FAN Motor Identification Installation Check List

none specifications

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