Emerson HP Serie Manual De Usario

Head Pressure Control Valves, Series
General information and technical data:
HP Regulators are used to maintain adequate
condensing pressure during low ambient conditions.
Thereby maintaining liquid
sufficient pressure drop through Thermo Expansion
Valve.
• Max. Operating Pressure PS: HP5/8: 31 bar
• Max. Test Pressure PT:
• Operating Temperature Range TS: -40°C to 150°C
• Max. Ambient Temperature:
• Max. Transport Temperature: -40 to 70°C
• Max. body temperature:
• Compatibility: CFC, HCFC, HFC, Mineral- and
Ester Lubricants
• Marking:
!
Safety instructions:
• Read Operationg 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 HP 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:
Change of Hazard Category of the product and
consequently change of conformity assessment
requirement for product in accordance with
European Pressure Equipment
97/23/EC.
• 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.
• HP Regulators are not released for use with
flammable refrigerants such as hydrocarbon
refrigerants and ammonia.
Mounting location:
• HP Regulators should be installed according to Fig.
1. For heat-reclaim purpose and parallel piping see
Fig. 2-6 and 7.
• Regulators may be mounted in horizontal or
vertical lines Up-side down position is not
recommended and can cause mal-function (Fig. 9).
HP___65059__R03.doc Replacement for __R02
Operating Instructions
HP
Installation of Regulator:
• Connect Tubing according to Fig. 1 (Port C, B,
and R) .
subcooling and • Before brazing clean tubing.
• Direct flame away from valve body (Fig. 8).
During brazing process the cooling of the regulator
body is necessary to avoid any internal damage
HP14: 28 bar (i.e. wet cloths). Do not exceed max. body
HP5/8: 34,5 bar
temperature of 150°C.
HP14: 31 bar • Use an inert gas such as nitrogen to pass through
the valve to prevent copper oxide formation.
-40 to 50°C • The use of appropriate brazing material is required
(soft solder is not allowed). Never use oxygen or
150°C 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.
• A pressure drop through the condenser (between
port B and C) of 1.4 bar and more will lead to
mal-function (hot gas is permanently feeded into
thoroughly.
the receiver even at high ambient temperatures
leading to high pressure alarm).
Leakage test:
• After completion of installation, a pressure test
skill. Before
must be carried out as follows:
- According to EN378 for systems which must
comply with
directive 97/23/EC.
- To maximum working pressure of system for
other applications.
Warning:
Failure to do so could result in loss of refrigerant
and personal injury.
The pressure test must be conducted by skilled
persons with due respect regarding the danger
related to pressure.
Directive
Application:
With this type of pressure control additional liquid
receiver capacity is required.
refrigerant /
WARNING: Do not use HP Regulators in
systems without Receiver.
To prevent compressor damage due to liquid
accumulation on the compressor head, good piping
practice suggests a trap in the discharge line and an
inverted trap at the condenser inlet.
In general, head pressure control systems of this type
are used on refrigeration systems which are
temperature operated.
Emerson Electric GmbH & Co. OHG
GB
Heerstr.111 – D-71332 Waiblingen
Tel.: 07151 509-0 - Fax.: -200
European pressure equipment
Date: 20.07.2009
www.emersonclimate.eu
This means that the compressor is started by a
thermostat or the system operates on a pump down
cycle where the thermostat controls the liquid line
solenoid valve and the compressor starts on a rise in
suction pressure with a low pressure switch.
On systems which are pressure operated, provision
should be made to prevent migration of the
refrigerant to the cold condenser on the "off" cycle.
If the system does not operate on a pump down
cycle, migration can take place through some
compressors, from the suction line to the condenser.
The use of crankcase heaters will prevent liquid
from condensing in the crankcase but will not
eliminate migration to the cold condenser. If the
system is properly charged, the filled condenser will
permit the excess to remain in the receiver.
Under certain conditions where the receiver is
located in a warm ambient, a check valve in the
liquid drain line between the HP control and the
receiver may be required to prevent the liquid
receiver pressure from equalizing to that of the
condenser during the "off" cycle, thus enabling the
system to start on a pressure switch. Some systems
may require a time delay on the low pressure switch.
Condenser fans should not be cycled when using the
HP control. The sudden changes in high side
pressure caused by fan cycling will result in erratic
thermostatic expansion valve performance and
shortened head pressure control life.
Service:
• Before any service shut down system and
disconnect from power source.
• After reducing pressure to atmospheric the
regulator may be replaced (cannot be repaired). In
case of mal-function the regulator can be set to
summer conditions by releasing the pressure in the
dome of the regulator(cut off the cap. Tube). In
that case there is full flow from port C to port R.
WARNING: When cutting off the cap tube liquid
refrigerant could blow out.
Code for min. Condensing Temperature
(°C):
(HP are factory set. Readjustment is not possible.)
Code R134a R22 R407C
95 30
135 40 25
165 47 30
225 43
R507 / R404A
25 26
35 37
PCN 861 376