Carrier 50K - Manual

Carrier
INSTALLATION
50K
SUPPLEMENTARY INSTRUCTION
FOR 50K CONOENSERLESS UNITS
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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 filter-
drier 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.
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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