Carrier 50BV020-064 A - Hot Water Pressure Drop, 50BVC,E,J,K,Q Units, B - Hot Water Pressure Drop

Page 23
Table 6A — Hot Water Pressure Drop

Table 6A — Hot Water Pressure Drop

50BVC,E,J,K,Q Units

FLOW RATE

SIZE 020

SIZE 024

SIZE 028

SIZE 034

(gpm)

 

Pressure

Drop (ft wg)

 

10

0.7

0.7

0.7

15

1.5

1.5

1.5

20

2.6

2.6

2.6

25

4.0

4.0

4.0

30

5.8

5.8

5.8

0.1

35

7.8

7.8

7.8

0.1

40

10.2

10.2

10.2

0.1

45

12.9

12.9

12.9

0.2

50

15.8

15.8

15.8

0.2

55

0.3

60

0.3

65

0.4

LEGEND

GPM — Flow Rate

PD — Pressure Drop (ft wg)

Table 6B — Hot Water Pressure Drop

50BVT,U,V,W,X Units

FLOW RATE

SIZE 034

SIZE 044

SIZE 054

SIZE 064

(gpm)

 

Pressure

Drop (ft wg)

 

45

2.4

50

3.0

55

3.6

60

4.3

65

5.0

70

5.7

75

6.6

80

7.4

85

8.4

90

9.3

2.5

2.5

2.5

100

3.1

3.1

3.1

110

3.7

3.7

3.7

120

4.4

4.4

4.4

130

5.1

5.1

5.1

140

5.9

5.9

5.9

150

6.7

6.7

6.7

160

7.6

7.6

7.6

170

8.6

8.6

8.6

180

9.6

9.6

9.6

LEGEND

GPM — Flow Rate

PD — Pressure Drop (ft wg)

Pipe sizes should be selected based on the head pressure available from the pump. Water velocity should not exceed 8 fps. Design the piping system for approximately 3 ft of loss per 100 equivalent ft of pipe. The piping system should allow for expansion and minimize vibration between the unit and piping system.

WATER ECONOMIZER (Optional) — The optional waterside economizer (pre-cooling coil) is factory-installed and piped inter- nally, in series with the condenser water circuit (Fig. 21). A divert- ing valve and factory controls are included with the option. Only one set of field connections needs to be made for condenser water and economizer water. In addition, when the unit is shipped with the economizer option, the economizer drain must be connected to a separate trap. Follow the same steps for the economizer drain as described for the evaporator condensate drain. An Aquastat is used to modulate water flow through the economizer. The control- ler is mounted to the low voltage control box. Electrical connec- tions are factory installed and wired. The remote bulb is shipped internal to the unit and requires field mounting. Care should be taken not to dent the bulb or miscalibration may occur. The Aquastat has a temperature range adjustment (–30 F to 100 F) and is field set. See Fig. 2-14 for connection locations and sizes. See Tables 7A and 7B for economizer waterside pressure drop data.

The waterside economizer can also be ordered without factory-installed piping or controls. This offers additional flexibility for specific applications. In this case, the coil is factory mounted, but all supply and return piping and controls are field supplied.

Table 7A — Economizer Pressure Drop Curve

(ft wg), 50BVC,E,J,K,Q Units

FLOW RATE

SIZE 020

SIZE 024

SIZE 028

SIZE 034

(gpm)

 

Pressure

Drop (ft wg)

 

35

8.9

40

11.5

11.0

45

14.4

13.8

50

17.6

16.9

16.9

55

21.1

20.4

20.4

60

24.9

24.1

24.1

3.5

65

29.0

28.1

28.2

4.1

70

34.4

32.5

32.5

4.7

75

37.1

37.2

5.4

80

42.1

42.1

6.1

85

47.4

6.9

90

52.9

7.7

95

58.7

8.5

100

64.9

9.4

105

10.3

110

11.3

115

12.3

120

13.4

LEGEND

GPM — Flow Rate

PD — Pressure Drop (ft wg)

3-WAY MOTORIZED

BALL VALVE

a50-7269ef

 

WATERSIDE

ECONOMIZER

N.C.COIL

N.O.

AQUASTAT

MBV

N.O.

FLUID IN

“BULB STRAPPED TO FLUID” IN LINE (FIELD INSTALLED)

FLUID TO REFRIGERANT

HEAT EXCHANGER

POSITIVE SHUT-OFF SOLENOID VALVE FOR VARIABLE SPEED PUMPING SYSTEM

(FIELD INSTALLED)

Fig. 21 — Optional Water Economizer

23

Image 23
Contents SAFETY CONSIDERATIONS Installation, Start-Upand Service InstructionsCONTENTS GENERAL MAJOR SYSTEM COMPONENTS Constant Volume CV Unitsa50-7257ef INSTALLATIONStep 1 - Complete Pre-InstallationChecks Table 2 - Modular Unit Shipping TableFig. 2 - 50BVC,J,Q020-034Dimensions Fig. 3 - 50BVE,K020-034Dimensions a50-8201 Fig. 4 - 50BVT,V,W034 High-BoyDimensionsFig. 5 - 50BVT,V,W034 Low-BoyDimensions Fig. 6 - 50BVT,V,W044-064 High-BoyDimensions Fig. 7 - 50BVT,V,W044-064 Low-BoyDimensions Fig. 8 - 50BVU,X034 High-BoyDimensions Fig. 9 - 50BVU,X034 Low-BoyDimensions Fig. 10 - 50BVU,X044-064 High-BoyDimensions Fig. 11 - 50BVU,X044-064 Low-BoyDimensions a50-7306ef NOTES 1.Dimensions in inches mma50-7307ef NOTES 1.Dimensions in inches mmSize 034 Units Size 044-064Units Shipping Weights lba50-8235 Table 3A - Physical Data - 50BVC,E,J,K,Q Table 3B - Physical Data - 50BVT,U,V,W,X Multiple Fan Units Fig. 15 - Typical Fan Discharge Connections fora50-7267ef a50-7138efFig. 16 - Duct Static Pressure Probe P/N 39EK20462Fig. 18 - DHS Pressure Limit Location Fig. 19 - DHS Limit Switch P/NStep 4 - Make Piping Connections a50-825350BVT,V,W Units Table 5A - Condenser Pressure Drop50BVC,J,Q Units Table 5B - Condenser Pressure Drop50BVT,U,V,W,X Units Table 6A - Hot Water Pressure Drop50BVC,E,J,K,Q Units Table 6B - Hot Water Pressure Dropa50-7270ef Step 5 - Complete Electrical ConnectionsTable 7B - Economizer Pressure Drop Curve ft wg, 50BVT,U,V,W,X UnitsTable 9A - Electrical Data - 50BVC,E,J,K,Q Table 9B - Electrical Data - 50BVT,U,V,W,X Two-StageCooling Units Fig. 24 - Typical Wiring 18 to 30 Ton Unitsa50-7272ef Fig. 26 - Field Terminal Block a50-7273efTable 10 - Recommended Cables a50-7164tfa39-1867t Installation Unit Discharge Locationa50-7275ef Fig. 27 - Modular Unit VAV Control Panel10 Kilo- ohm START-UPTable 11 - Thermistor Resistance vs Temperature Values for Supply-AirTemperature SensorTable 13 - Fan Performance - 50BVC,E,Q020 CV Unit Start-UpTable 14 - Fan Performance - 50BVC,E,Q024 Table 15 - Fan Performance - 50BVC,E,Q028 Table 16 - Fan Performance - 50BVC,E,Q034 Table 17 - Fan Performance - 50BVT,U,V034 Table 17 - Fan Performance - 50BVT,U,V034 cont Table 18 - Fan Performance - 50BVT,U,V044 Table 19 - Fan Performance - 50BVT,U,V054 Table 19 - Fan Performance - 50BVT,U,V054 cont Table 20 - Fan Performance - 50BVT,U,V064 Table 20 - Fan Performance - 50BVT,U,V064 cont VAV Unit Start-Up a50-7425ef OMNIZONE VPAC02-06-04 Fig. 32 - LIDFig. 33 - 50BV VFD Display The LID display will show Year Table 23 - Software Points Table 21 - Controller Set PointsTable 22 - Controller Hardware Points Table 24 - Configuration Parameters Unoccupied space or return air temperature demand MAINTENANCE SERVICEFig. 35 - Forced Circulation Method a50-186tfFig. 34 - Gravity Flow Method a50-187tfa50-7135tf Evaporator Fan Performance AdjustmentTROUBLESHOOTING Charging the SystemPOSSIBLE CAUSE PROBLEMPOSSIBLE CAUSE Table 28 - Unit TroubleshootingPROBLEM CORRECTION PROCEDURETable 31 - Clearing a Forced Input or Output Table 29 - CV Units LED Diagnostic CodesTable 30 - Forcing an Input or Output Page Page Page Page UNIT WIRING FIELD WIRINGPage TRANS-1 FIELD WIRINGWIRE LEGEND a50-7282efPCB2 J1 FIELD WIRINGPCB1 FIELD WIRINGUNIT WIRING PCB1 FIELD WIRINGLEGEND AND NOTES FOR FIG 10-08 Copyright 2008 Carrier CorporationCatalog No Form 50BV-3SICONTROLS START-UPCHECKLISTI. PRELIMINARY INFORMATION II. PRE-START-UPIII.START-UP