Carrier 50K User Manual

Carrier

INSTALLATION

SUPPLEMENTARY INSTRUCTION

FOR 50K CONOENSERLESS UNITS

50K

8) CJ

O M

tì

The following items are included in the base unit for field installation:

a. Discharge Line Assembly

b. Moisture and Liquid Indicator

c. Filter-drier

d. Crankcase Heater Relay Assembly

e . Condenser Fan Relay Assembly

NOTE: One each of the above items is used on

all units, except the 50K16-2 compres sor model which has two each.

Install this unit in accordance with the instructions in the Unit Installation Instruction Book (50K8-1005 Rev. ) except for the following items .

AIR-COOLED CONDENSER LOCATION

The air-cooled condenser should not be located more than 60 feet above, or 15 feet below the base unit.

Cneck the installation booklet with the condenser for

installation details.

In order to prevent condensed liquid refrigerant or oil from causing damage to the compressor, install a trap in the vertical discharge line near the com

pressor. The trap may be installed within or ad jacent to the base unit chassis. The height of the trap (or loop) should be 6 inches for every 10 feet

of vertical discharge line. If the height of the ver tical discharge line is such as to make a single trap

impractical, the loop can be replaced by a check valve or several traps.

When installing refrigerant piping make certain it

is well supported. Install piping with sufficient flex ibility to make sure line vibrations are not trans

mitted to the building.

The openings in the chassis normally used for the water-cooled condenser water piping may be used to

bring the lines into the unit.

Install the discharge line assembly, filter-drier and

the moisture and liquid indicator in each circuit

within the chassis of the base unit. Locate the filterdrier and the moisture and liquid indicator in the liquid line just before the liquid line enters the expansion valve. The moisture and liquid indicator goes between the filter-drier and the expansion valve.

U d

CRANKCASE HEATERS

One crankcase heater (230 volt, 1 phase, 60 cycle) will be factory installed on the outside of the bottom plate of each compressor. The crankcase heater elements replace the need for the liquid lines sole noid valves. Each crankcase heater has 36 inch leads for wiring in the field.

REFRIGERANT PIPING

Install the hot gas and liquid line between the base unit and the external condenser for each system be ing careful to connect the correct components in

each system. Fig. 1 through 4 shows the location

of the connections at the base unit. Fig. 5 through 7 shows the schematic piping layout for the various units when connected with the 9AB Air-Cooled Con

denser. Table 2 shows the connection sizes at the

base unit and recommends line sizes for various

refrigerant line lengths . Consult the Installation Instructions of the condenser used and Part 3 of the System Design Manual for piping details and line sizes when greater lengths are used.

PRESSURE RELIEF PROTECTION

Refrigerant pressure relief protection must be pro

vided for each system at the time of installation of

the unit. A suitable fusible union, a liquid line soft

solder joint within the base unit, or a rupture disc

(Chicago Code) may be used depending on local

codes, etc.

The 9AB6 receiver is provided with a 3/8" FPT fitting

for the installation of a fusible union or rupture disc.

The Cerro De Pasco Co. fusible union No. 5160-1

or No. 5250-1 (melting point 197 F or 203 F), Carrier Part No. EK41JN200 is suitable; check local codes.

HEAD PRESSURE CONTROL

A condensing pressure (head pressure) control acces sory package is available for use with the 9AB conden sers . Consult the 9AB Instruction Sheets for details.

Carrier Corporation 1960

Litho in U.S. A. 12-60

50K8-1415

50K

Unit

INSTALLATION

TABLE 1

Compressor

Circuit No

Model

Location

Evaporator Coil Liquid Line Connection

Carrier

R-22

Pounds

50K8

50K12 Single Compressor

50K16 Single Compressor

50K16

2 Compressor

Discharge Line

Unit Connection

50K8

50K12 Single Compressor

50K16 (Ea. Circuit)

2 Compressor

7/8

(1 Circuit) 6D48

(1 Circuit)

No. 1 No. 2

Liquid Line Connection Line

6D68 -

6D75

6D48 6D48

TABLE 2

1/2

5/8

1/2

Left Side Right Side

Recommended Line Sizes

20 40

Liquid

Hot Gas

1/2 7/8

5/8

1/2

7/8

- 15

Right End 10

Left End

Linear Feet Piping

Liquid Line

Hot Liquid Hot Gas

1/2

5/8 1-1/8

1/2

7/8

Line

1/2

3/4

Gas

7/8

1-1/8

7/8

50K16

Single Compressor 1-1/8

REFRIGERANT CHARGE

The unit will be shipped with a 2 lb. holding charge

of Refrigerant 22. In the standard installation,

Refrigerant 22 will be used. However, on special

applications. Refrigerant 500 may be used. Con sult your Application Engineering Data for informa tion concerning the use of Refrigerant 500. When Refrigerant 500 is used, change the expansion valve to the one shown in Table 3.

REFRIGERANT CHARGE QUANTITY

During operation on Refrigerant 22 the base unit alone requires the number of pounds shown in Table 1. To this, add the needs for the refrigerant lines, con densers, and receivers (if used). Stamp the number

of pounds used in the blank space provided on the

nameplate.

5/8 5/8 1-1/8 3/4 1-1/8 3/4 1-3/8

TABLE 3 - VALVES FOR R-500 SERVICE

Unit

50K8

50K12

Single Compressor

50K16

Single Compressor

50K16 2 Compressor (2) required

DUAL PRESSURESTATS

Adjust the pressurestats according to pressure shown in Table 4.

Sporlaii Valve

PDE6G

PDE9G

PDE13G

PDE6G

Carrier

INSTALLATION

50K

TABLE 4

High Press. Switch

Refrig.

22 284 364

500

The moisture and liquid indicator must be full of liquid refrigerant to properly indicate the moisture content of the refrigerant. Operate the system at least 30 minutes before attempting to determine the moisture reading.

The compiete refrigerant system should be evacuated with a good vacuum pump before charging with refrig erant. When charging, connect a cylinder of refrig erant through a tee to a gauge and to the gauge port

on the compressor service valve. Have the cylinder in the upright position to admit vapor only. Admit re-

refrigerant to break the vacuum in the system. Start the compressor and modulate the valve on the cylinder to keep the suction pressure slightly under 50 psig.

Charge the system until liquid refrigerant will bleed

from the liquid level check port on the receiver and

also until the sight glass is clear. *

Cut-In

218 265

SPORLAN SEE-ALL MOISTURE AND

CHARGING PROCEDURE

Cut-Out Cut-In Cut-Out

LIQUID INDICATOR

Low Press. Switch

83 67

46 30

NOTE* If the liquid refrigerant bleeds from the

liquid level check port on the receiver but there is stUl flashing at the sight glass, there is an indication that there is a re

striction in the liquid line or filter-drier.

Let the system operate for 20 minutes to balance

out and recheck the refrigerant and oil levels.

The receiver has a bleeder port at the top to bleed non-condensables from the system. There has to

be sufficient refrigerant in the system to make a

liquid seal at the outlet of the receiver to trap the

non-condensables in the top of the receiver before

the bleeder port can be effective.

WIRING

The crankcase heater elements, heater relays, and the condenser fan relays are to be field wired. See Wiring Diagrams.

The crankcase heater relays are single pole, single throw, normally closed, relays . Each crankcase heater element is to be energized when its respec tive compressor is "OFF.”

The condenser fan relays (S.P.S.T. Normally open) are to be mounted per the condenser Installation In structions . The control voltage is supplied by the

base unit. Follow the right wiring diagram so the condenser fans wUl continue to run if the compres sor is shut down by one of its protective devices and the thermostat is stUl calling for cooling.

SIDE ELEVATION

FIG. 1 - LOCATION OF COMPRESSOR DISCHARGE AND LIQUID CONNECTIONS 50K8

FRONT ELEVATION

NOTE. ALL DIMENSIONS ARE TO 1 OUTSIDE OF CASING, NOT I TO OUTSIDE OF PANEL.

EXPANSION VALVEEXPANSI

COMPRESSOR

DISCHARGE VALVE

TABLE 5 - ELECTRICAL DATA

11.9

Wire Size Awg. No.

Locked Rotor Current

Amps.

Current Characteristics

208/220-3-60

440-3-60 60 90

KOTES; 1. Wire sizes, lengths, fuse sizes, and dual element fuse sizes snown are for the branch circuit between the disconnect switch and the unit.

120 180

2. The branch circuit wire sizes and the corresponding maximum wire lengths tabulated will result in a 1% voltage drop at the nameplate full load amperage. The ware size listed and the maximum fuse sizes are

m accordance with the National Electric Code.

3. Dual element fuses can be sized much closer to the actual running current than one-time link type fuses because of the built-in lag. Thus, dual element fuses give additional motor protection against both single phasing and locked rotor failure, should starter contacts fuse. Use dual element fuses for compressor protection on all installations. With properly selected fused disconnect switches, fuse reducers may be required.

50K

12 16

(1 Com.p.)

250

125

(2 Comp.)

120

Full Load Current

Amps.

50K

8 12 16

24.9

11.9

(1 Comp.)16(2 Comp.)

35.7

17.5 27.2

55. 6 24.9 6

Max. Wire Length Ft.

8 12

8 65 6

12 10

8 325 6 400

Wire Size Awg. No

100 4 155

135 10 210 8

Max. Wire Length Ft.

Wire

Size

Awg. No.

50 K 50K

100 160 235

170 260

Max. Wire

Length

Ft.

(i Comp.)

4 98 2 1

8 6

145 185

160 250 390

Wire Size Awg. No.

8 6 4

12 10

(2 Comp.)

Max. Wire Length Ft.

80 125 195

135 210 325

Dual Element Fuse Size

17-1/2

Amps.

(1 Comp.)16(2 Comp.)

17-1/2

(/»

Carrier

INSTALLATION

50K

SIDE ELEVATION

FIG. 2 - LOCATION OF COMPRESSOR DISCHARGE AND LIQUID CONNECTIONS 50KI2

SIDE ELEVATION

FRONT ELEVATION

FIG. 3 - LOCATION OF COMPRESSOR DISCHARGE AND LIQUID CONNECTIONS

50K16 SINGLE COMPRESSOR MODEL

SIDE ELEVATION

FRONT ELEVATION

FIG. 4 - LOCATION OF COMPRESSOR DISCHARGE AND LIQUID CONNECTIONS

50K16 - 2 COMPRESSOR MODEL

FIG. 5 - SCHEMATIC PIPING FOR 50K8 AND 50K12 WITH ONE (1) 9AB CONDENSER

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