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Carrier |
INSTALLATION |
50K |
SUPPLEMENTARY INSTRUCTION
FOR 50K CONOENSERLESS UNITS
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.
CRANKCASE HEATERS |
PRESSURE RELIEF PROTECTION |
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.
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 |
INSTALLATION |
Carrier
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TABLE 1 |
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Evaporator Coil |
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Compressor |
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Liquid Line |
R-22 |
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Unit |
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Circuit No |
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Connection |
Pounds |
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Model |
Location |
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50K8 |
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(1 Circuit) |
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6D48 |
- |
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- |
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10 |
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50K12 |
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(1 Circuit) |
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6D68 |
- |
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- |
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10 |
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Single Compressor |
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50K16 |
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(1 Circuit) |
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_ |
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- |
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15 |
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Single Compressor |
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6D75 |
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50K16 |
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No. 1 |
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6D48 |
Left Side |
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Right End |
10 |
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2 Compressor |
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No. 2 |
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6D48 |
Right Side |
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Left End |
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10 |
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TABLE 2 |
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Recommended Line Sizes |
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Linear Feet Piping |
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Discharge Line |
Liquid Line |
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20 |
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40 |
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60 |
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Liquid |
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Hot |
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Liquid |
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Hot |
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Liquid |
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Hot |
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Unit |
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Connection |
Connection |
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Line |
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Gas |
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Line |
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Gas |
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Line |
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Gas |
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50K8 |
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7/8 |
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1/2 |
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1/2 |
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7/8 |
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1/2 |
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7/8 |
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1/2 |
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7/8 |
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50K12 |
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7/8 |
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7/8 |
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Single Compressor |
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5/8 |
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5/8 |
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5/8 |
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1-1/8 |
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3/4 |
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1-1/8 |
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50K16 |
(Ea. Circuit) |
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2 Compressor |
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7/8 |
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1/2 |
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1/2 |
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7/8 |
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1/2 |
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7/8 |
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1/2 |
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7/8 |
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50K16 |
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Single Compressor |
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1-1/8 |
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5/8 |
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5/8 |
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1-1/8 |
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3/4 |
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1-1/8 |
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3/4 |
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1-3/8 |
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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.
TABLE 3 - VALVES FOR R-500 SERVICE
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Unit |
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Sporlaii Valve |
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50K8 |
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PDE6G |
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50K12 |
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PDE9G |
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Single Compressor |
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50K16 |
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PDE13G |
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Single Compressor |
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50K16 |
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PDE6G |
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2 Compressor |
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(2) required |
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DUAL PRESSURESTATS |
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Adjust the pressurestats |
according to pressure shown |
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in Table 4. |
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Carrier
INSTALLATION |
50K |
TABLE 4
Refrig. |
High Press. Switch |
Low Press. Switch |
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Cut-In |
Cut-Out |
Cut-In |
Cut-Out |
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22 |
284 |
364 |
83 |
46 |
500 |
218 |
265 |
67 |
30 |
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SPORLAN SEE-ALL MOISTURE AND
LIQUID INDICATOR
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.
CHARGING PROCEDURE
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 rerefrigerant 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. *
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 |
FRONT ELEVATION |
NOTE. ALL DIMENSIONS ARE TO 1 OUTSIDE OF CASING, NOT I TO OUTSIDE OF PANEL.
EXPANSION VALVE
COMPRESSOR
DISCHARGE VALVE
48
FIG. 1 - LOCATION OF COMPRESSOR DISCHARGE AND LIQUID CONNECTIONS 50K8
TABLE 5 - ELECTRICAL DATA
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Wire |
Max. Wire |
Wire |
Max. Wire |
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Wire |
Max. Wire |
Wire |
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Max. Wire |
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Locked Rotor Current |
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Full Load Current |
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Size |
Length |
Size |
Length |
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Size |
Length |
Size |
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Length |
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Dual Element Fuse Size |
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Amps. |
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Amps. |
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Awg. No. |
Ft. |
Awg. No |
Ft. |
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Awg. No. |
Ft. |
Awg. No. |
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Ft. |
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Amps. |
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Current |
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50K |
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50K |
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50 K |
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50K |
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Characteristics |
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8 |
12 |
16 |
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16 |
8 |
12 |
16 |
16 |
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8 |
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12 |
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16 |
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16 |
8 |
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12 |
16 |
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16 |
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(1 Com.p.) |
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(2 Comp.) |
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(1 Comp.) |
(2 Comp.) |
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(i Comp.) |
(2 Comp.) |
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(1 Comp.) |
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(2 Comp.) |
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8 |
65 |
6 |
100 |
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4 |
98 |
8 |
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80 |
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208/220-3-60 |
120 |
180 |
250 |
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120 |
24.9 |
35.7 |
55. 6 |
24.9 |
6 |
100 |
4 |
160 |
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2 |
145 |
6 |
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125 |
35 |
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60 |
SO |
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35 |
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4 |
155 |
2 |
235 |
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1 |
185 |
4 |
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195 |
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12 |
135 |
10 |
170 |
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8 |
160 |
12 |
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135 |
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440-3-60 |
60 |
90 |
125 |
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60 |
11.9 |
17.5 |
27.2 |
11.9 |
10 |
210 |
8 |
260 |
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6 |
250 |
10 |
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210 |
17-1/2 |
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25 |
40 |
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17-1/2 |
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8 |
325 |
6 |
400 |
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4 |
390 |
8 |
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325 |
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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.
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.
z
(/»
>
>
oz
Carrier
INSTALLATION |
50K |
SIDE ELEVATION |
FRONT 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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