Emerson CPHE Operating Instructions Manual

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Description and Technical Data:
Regulators are used to avoid permanent on/off
cycling of compressor or to keep evaporating
temperatures above certain levels
• Can be installed in any position.
• Intended for use with CFC, HCFC, HFC
• Adjustable from: CPHE -0,4 to 5 bar
• ACP: 0 to 5 bar
• Factory setting: CPHE: 1,4 bar
• ACP: 2,7 bar
• Max. allowable pressure PS:
• ACP 31 bar
• Medium temperature range TS: -40°C to 120°C
• Ambient temperature range:
• Transport temperature range:
• Marking:
•
!
Safety Instructions:
• Read installation instructions thoroughly.
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 skill. Before
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 change of Hazard
Category of the product and consequently
change of conformity assessment requirement
for product in accordance with European
Pressure Equipement Directive 97/23/EC.
• In a severely contaminated system, avoid
breathing acid vapours and avoid contact with
skin from contaminated refrigerant / lubricants.
Failure to do so could result in skin injury.
• CPHE and ACP are not released for use with
flammable refrigerants such as hydrocarbon
refrigerants and ammonia.
• The CPH(E) regulator's power assembly and
cage assembly must be removed before
soldering.
Installation and Mounting:
Two typical installation applications are possible:
Hot Gas Bypass to the evaporator inlet (with up to
100% of capacity control) per Fig. 1
Hot Gas Bypass to the suction line (max. 40% of
capacity control because of oil return
capability) per Fig. 2
• Pressure regulators can be installed in any position.
• Direction of flow must match arrow on body.
• Before brazing clean tubing.
• CPHE: Remove power assembly and cage before
brazing.
• ACP: Do not disassemble valve before brazing.
CPHE_65008__R05
Operating Instructions Operating Instructions
Pressure Regulator Pressure Regulator
CPHE and ACP CPHE and ACP
• Use wet rags or chill blocks when brazing to Use wet rags or chill blocks when brazing to
prevent valve damage. prevent valve damage.
Do not exceed max. body temperature of 120°C. Do not
Direct flame away from valve body (Fig. 3). Direct flame away from valve body (Fig. 3).
Use an inert gas such as nitrogen to pass through Use an inert gas such as nitrogen to pass through
the valve to prevent copper oxide formation. the valve to prevent
• The use of appropriate brazing material is required The use of appropriate brazing material is required
(soft solder is not allowed). (soft solder is not allowed).
• Never use Never use oxygen or flammable gases.
• Internal parts must be protected from foreign Internal parts must be protected from foreign
material and moisture. ALCO filter-drier use in material and moisture. ALCO filter
CPHE: 35 bar
liquid line and ALCO filter use in suction line is liquid line and ALCO filter use in suction line is
recommended. recommended.
• Install the external equalizer line to the compressor Install the external equalizer line to the compressor
-40 to 50°C
suction line alw suction line always downstream from evaporator
-40 to 70°C
pressure regulators. NEVER join the equalizer line pressure regulators. NEVER join the equalizer line
with another control except of the Liquid Injection with another control except of the Liquid Injection
Valve. Valve.
Setting: Setting:
If desired set point differs from factory setting, If desired set point differs from factory setting,
follow the procedure for setting before any follow the procedure for setting before any
installation and/or refer to the Adjustment Table installatio
below: below
The function of the CPHE and ACP series regulators The function of the CPHE and ACP series regulators
is to prevent the suction pressure from falling below is to prevent the suction pressure from falling below
a predetermined set point, thereby balancing the a predetermined set point, thereby balancing the
system. Therefore, the first step after installation is system. Therefore, the first step after installation is
to determine this set point for the minimum suction to determine this set point for the minimum suction
pressure allowable for your application. To do so, pressure allowable for your application. To do so,
follow this procedure: follow this procedure:
• Start the system and determine if it is operating Start the system and determine if it is operating
properly. Install a gauge on the compressor suction properly. Install a gauge on the compressor suction
line and measure the suction pressure after the line and measure the suction
system has stabilized. To make sure, that hot gas is system has stabilized. To make sure, that hot gas is
not bypassed de not bypassed de-energize the hot gas solenoid.
• Remove the seal cap (1) and turn the power Remove the seal cap (1) and turn the power
assembly adjusting stem (2) full assembly adjusting stem (2) full
COUNTERCLOCKWISE. COUNTERCLOCKWISE.
• Reduce the evaporator load until the sucti Reduce the evaporator load until the suction
pressure lowers to the point at which bypass is pressure lowers to the point at which bypass is
desired. desired.
• Energize hot gas solenoid to enable gas flow. Energize hot gas solenoid to enable gas flow.
• Turn the power assembly adjusting stem on top of Turn the power assembly adjusting stem on top of
the regulator in a CLOCKWISE direction until the regulator in a CLOCKWISE direction until
bypass occurs and suction pressure does not fall bypass occurs and suction pressure does not fall
below t below the predetermined set point. A
CLOCKWISE turn of the adjusting stem will CLOCKWISE turn of the adjusting stem will
increase the pressure setting; a increase the pressure setting; a
COUNTERCLOCKWISE turn will decrease it. COUNTERCLOCKWISE turn will decrease it.
Adjustments should be made in small increments, Adjustments should be made in small increments,
allowing the system to stabilize after each turn. allowing the system to stabilize after each turn.
Do not Do not turn adjustment screw on the side of the
regulator (only CPHE). This screw should only be regulator (only CPHE). This screw should only be
used when working in a vacuum temperature range used when working in a vacuum temperature range
• Vary evaporator load to test at various conditions Vary evaporator load to test at various conditions
that the suction pressure does not fall below the that the suction pressure does not fall below the
predetermined set point. predetermined set point
• CPHE: Replace the seal cap (1) on the adjusting CPHE: Replace the seal cap (1) on the adjusting
stem (Fig 4). stem (Fig 4).
• ACP: replace plastic cap ACP: replace plastic cap
Replacement for 04 Replacement for 04
Emerson Climate Technologies GmbH Emerson Climate Technologies GmbH
GB
Holzhauser Str. 180 - D-13509 Berlin
Germany
www.emersonclimate.eu
NOTES:
• On multiple evaporator systems, do not pipe hot On multiple evaporator systems, do not pipe hot
gas to more than one evaporator. Use separate gas to more than one evaporator. Use separate
bypass regulators or consult the ALCO bypass regulators or consult the ALCO
Applications Engineering De Applications Engineering Department.
• If the compressor is located above the evaporator, If the compressor is located above the evaporator,
bypass should be piped to the evaporator to insure bypass should be piped to the evaporator to insure
proper oil return during low load bypass proper oil return during low load bypass
conditions.
• On a long piping run, bypass to the evaporator, On a long piping run, bypass to the evaporator,
insulate the bypass to prevent condensate. insulate the bypass to prevent condensate.
Condensate can lead to unstable conditions and Condensate can lead to unstable conditions and
or flooding of the compressor. or flooding of the compressor.
Solenoid Connections Solenoid Connections
• If a compressor discharge line thermostat is used, If a compressor discharge line thermostat is used,
it is recommended that the solenoid it is recommended that the solenoid is wired in
series with the thermostat. series with the thermostat.
• Voltage and frequency of the c Voltage and frequency of the coil must correspond
to the power source. Connect leads to the power to the power source. Connect leads to the power
source.
(NEVER wire on the load side of the motor (NEVER wire on the load side of the motor
starter.)
Note 1: For installation of a Liquid Injection Valve Note 1: For installation of a Liquid Injection Valve
(e.g. L-series), refer to ALCO's catalog for selection
and see the Superheat Table below.
Note 2: If a liquid-injection solenoid valve is used,
the electrical connections should be in parallel with the electrical connections should be in parallel with
the hot gas solenoid valve. the hot gas solenoid valve.
Leakage test:
• After completion of installation, a pressure test After completion of installation, a pressure test
must be carried out as follows: must be carried out as follows:
• - According to EN378 for systems which must According to EN378 for systems which must
comply with European pressure equipment comply with European pressure equipment
directive 97/23/EC.
• - To maximum working pressure of system for To maximum working pressure of system for
other applications. other applications.
Warning:
• Failure to do so could result in loss of refrigerant Failure to do so could result in loss of refrigerant
and personal injury. and personal injury.
• The pressure test must be conducted by skilled
persons with due respect regarding the danger persons with due respect regarding the danger
related to pressure. related to pressure.
Service:
• Before any service shut down system and Before any service shut down system and
disconnect from power source. disconnect from power source.
• Fully depressurize regulator. After reducing Fully depressurize regulator. After reducing
pressure to atmospheric pressure to atmospheric only CPHE regulator may
be opened, internal parts removed, cleaned and be opened, internal parts removed, cleaned and
replaced, per Fig.4. Install parts in reverse replaced, per Fig.4. Install parts in reverse
sequence as removed. sequence as removed.
• Replace gaskets 4, 6 and 7 before reassembling the Replace gaskets 4, 6 and 7 before reassembling the
regulator.
• Tighten capscrews evenly to torque specification Tighten capscrews evenly to torque specification
35 Nm.
Date: 20.06.2013
13509 Berlin
series), refer to ALCO's catalog for selection
eat Table below.
injection solenoid valve is used,
97/23/EC.
ressure test must be conducted by skilled
DWG Nr.: CPH EZ 005000/PCN 863003 DWG Nr.: CPH EZ 005000/PCN 863003