ALCO CONTROLS CPHE Serie Betriebsanleitung

Emerson Electric GmbH & Co
Heerstr.111 – D 71332 Waiblingen
Tel.: 07151 509-0 - Fax.: -200
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:
• Factory Setting:
• Max. operating Pressure PS:
• Operating Temperature Range TS: –40°C to 120°C
• Ambient Temperature Range:
CPHE ACP
• Transport Temperature Range:
!
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.
Use wet rags or chill blocks when brazing to prevent valve damage.
Do not exceed max. body temperature of 120°C.
Direct flame away from valve body (Fig. 3).
Use an inert gas such as nitrogen to pass through the valve to prevent
copper oxide formation.
• The use of appropriate brazing material is required (soft solder is not allowed).
• 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.
• Install the external equalizer line to the compressor suction line always
downstream from evaporator pressure regulators. NEVER join the
equalizer line with another control except of the Liquid Injection Valve.
Setting:
If desired set point differs from factory setting, follow the procedure for
setting before any installation and/or refer to the Adjustment Table below:
The function of the CPHE and ACP series regulators is to prevent the suction
pressure from falling below a predetermined set point, thereby balancing the
system. Therefore, the first step after installation is to determine this set point for
the minimum suction pressure allowable for your application. To do so, follow
this procedure:
• Start the system and determine if it is operating properly. Install a gauge on the
compressor suction line and measure the suction pressure after the system has
stabilized. To make sure, that hot gas is not bypassed de-energize the hot gas
solenoid.
• Remove the seal cap (1) and turn the power assembly adjusting stem (2) full
COUNTERCLOCKWISE.
• Reduce the evaporator load until the suction pressure lowers to the point at
which bypass is desired.
• Energize hot gas solenoid to enable gas flow.
Document Nr.: A6.5.008 / 01
ALCO CONTROLS
CPHE -0,4 to 5 bar,
ACP: 0 to5 bar
CPHE: 1,4 bar
ACP: 2,7 bar
CPHE: 28 bar
ACP
-40 to 50°C
-40 to 70°C
Replacement for A6.5.008 / 00
Operating Instructions
Pressure Regulator CPHE and ACP
• Turn the power assembly adjusting stem on top of the regulator in a
CLOCKWISE direction until bypass occurs and suction pressure does not fall
below the predetermined set point. A CLOCKWISE turn of the adjusting stem
will increase the pressure setting; a COUNTERCLOCKWISE turn will
decrease it. Adjustments should be made in small increments, allowing the
system to stabilize after each turn.
Do not turn adjustment screw on the side of the regulator (only CPHE). This
screw should only be used when working in a vacuum temperature range
• Vary evaporator load to test at various conditions that the suction pressure does
not fall below the predetermined set point.
• CPHE: Replace the seal cap (1) on the adjusting stem (Fig 4).
• ACP: replace plastic cap
31 bar
Adjustment Table (FS= factory setting)
Evaporator
Temp.
°C
10
5
0
-10
-20
-30
NOTES:
• On multiple evaporator systems, do not pipe hot gas to more than one
evaporator. Use separate bypass regulators or consult the ALCO Applications
Engineering Department.
• If the compressor is located above the evaporator, bypass should be piped to the
evaporator to insure proper oil return during low load bypass conditions.
• On a long piping run, bypass to the evaporator, insulate the bypass to prevent
condensate. Condensate can lead to unstable conditions and or flooding of
the compressor.
Solenoid Connections
• If a compressor discharge line thermostat is used, it is recommended that the
solenoid be wired in series with the thermostat.
• Voltage and frequency of the coil must correspond to the power source.
Connect leads to the power source.
(NEVER wire on the load side of the motor starter.)
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 hot gas solenoid valve.
Leakage test:
• After completion of installation, a pressure test must be carried out as follows:
- According to EN378 for systems which must comply with European pressure
equipment 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.
Service:
• Before any service shut down system and disconnect from power source.
• Fully depressurize regulator. After reducing pressure to atmospheric only
CPHE regulator may be opened, internal parts removed, cleaned and replaced,
per Fig.4. Install parts in reverse sequence as removed.
• Replace gaskets 4, 6 and 7 before reassembling the regulator.
• Tighten capscrews evenly to torque specification 35 Nm.
Suction Superheat Table for Liquid Injection Valve Charges (K)
Charge Code
CL
GL
UL
Date: 17.12.2003
CPHE
R134a R22 R407C R404A R134a R22 R407C R404A
R507
6 - -
4 12 14 -
2 9 8 14
-1,5 4 3 7
FS 2,5
-1
R134a R22
- 15
15 30
30 45
DWG Nr.: CPH EZ 005000/PCN 863003...
GB
ACP
R507
0,5 4,5 4
0,3 3 2,5 5
-1 1,8 1,3 3,5
-2,5 FS -0,75 1
-1,8 -0,8
-2,3
R407C R404A
R507
13 22
25 30
40