Emerson PRE Serie Instrucciones De Funcionamiento

Evaporator- and Crankcase
Pressure Regulators PRE/PRC
General information and technical data:
PRE/PRC are controlling Evaporator Pressure- or
Crankcase Pressure depending on the specific setting
of the Regulator.
• Max. Operating Pressure Ps: 25 bar
• Max. Test Pressure: 30 bar
• Operating Temperature Range Ts: –30°C to 80°C
• Max. body temperature 130°C
• Compatibility: CFC, HCFC, HFC, Mineral- and
Ester Lubricants
• Marking:
!
Safety instructions:
• Read
installation instructions
Failure to comply can result in device failure,
system damage or personal injury.
• It is intended for use by persons having the
appropriate knowledge and
attempting to install the regulator make sure
pressure in system is brought to and remains at
atmospheric pressure.
• Do not release any refrigerant into the
atmosphere.
• Do not use any other fluid media without prior
approval of Alco Controls. Use of fluid not
listed could result in chemical deterioration of
internal material.
• In a severely contaminated system, avoid
breathing acid vapours and avoid contact with
skin from contaminated
lubricants. Failure to do so could result in skin
injury.
• PRC/PRE valves are completely hermetic and
cannot be dissassembled for inspection or
cleaning.
PRCE_65043__R05
Operating Instructions
• WARNING: Install Schraeder-Valve before
pressurizing the system. Failure to install valve
can result in loss of refrigerant or personal
injury.
• PRC/PRE are not released for use with
flammable refrigerants such as hydrocarbon
refrigerants and ammonia.
Setting:
Factory setting (FS) can be changed by the
according spindle turns (see Fig. 1) mentioned in the
Table below. Follow the procedure for setting before
any installation. After the system is running setting
must be cross-checked with a gauge.
thoroughly. Capacity Size
Evapor./Crankcase
Temperature °C
15
10
5
skill. Before
0
-5
-10
-15
-20
-25
-30
Mounting location:
• PRE should be installed as close as possible at the
Evaporator
Expansion Valves bulb/external equalizer. PRC
should be located as close as possible to the
Compressor but upstream of any vibration
eliminator that might be present (Fig. 4 and 5).
refrigerant /
• Allow sufficient clearance above the valve for
adjustment of pressure.
Installation:
• Before brazing remove top cap and brass cap of
the 7/16" Schraeder-Valve connection. Be sure
that Schraeder-Valve is removed from the
Regulator (see Fig. 2).
Replacement for R04
Emerson Climate Technologies GmbH
GB
Holzhauser Str. 180 - D-13509 Berlin
Number of turns
for change of factory setting (FS)
R 134a R22 R 407C R404A/R507
1 2 1 2 1 2 1
3 4,7 8 12 7,5 11
1,9 2,8 6-1/4 9,5 5,5 8,5 8
0,8 1-1/4 4,5 7 4 6 6,5
FS FS 3-1/4 5 2,6 4 5
-1 -1,4 2 3 1,4 2 3,5
-1,6 -2,5 1 1,4 FS FS 2,2
FS FS 1
-1 -1,4 FS
-1,7 -2,5 -0,8
-2,25 -3,5 -1,75 -2,25
outlet but downstream of
Germany
www.emersonclimate.eu
• Direction of flow must match arrow on body.
• Use an inert gas such as nitrogen to pass through
the lines to prevent copper oxide formation.
• The use of
appropriate brazing material is
recommended. (soft solder is not allowed). During
brazing process the cooling of the valve-body is
necessary to avoid any internal damage. Do not
exceed max. body temperature of 130°C.
• Direct flame away from valve body. (Fig. 3)
• Never use oxygen or flammable gases.
• Internal parts must be protected from foreign
material and moisture. ALCO filter-drier use in
liquid line and ALCO filter use in suction line is
recommended.
Testing:
• After cool down period install Schraeder-Valve
2
using Torque from 0,29 to 0,34 Nm.
• Start system. Check for correkt pressure setting on
PRE/PRC. Screw top cap and brass cap tightly on
12
10
Regulator (Fig. 2).
7,5
Leakage test:
5-1/4
3,5
• After completion of installation, a pressure test
2
must be carried out as follows:
FS
-1
- According to EN378 for systems which must
comply with European
directive 97/23/EC
- To maximum working pressure of system for other
the
applications
Warning:
1. Failure to do so could result in loss of
refrigerant and person injury.
2. The pressure test must be conducted by skilled
persons with due respect regarding the danger
related to pressure.
PCN 862930
pressure equipment
10.07.2013