CPHE_65008__R05
Replacement for 04
Date: 20.06.2013
DWG Nr.: CPH EZ 005000/PCN 863003
Operating Instructions
Pressure Regulator
CPHE and ACP
GB
Emerson Climate Technologies GmbH
Holzhauser Str. 180 - D-13509 Berlin
Germany
www.emersonclimate.eu
Adjustment Table (FS= factory setting)
Evaporator
CPHE
ACP
Temp.
°C
R134a R22 R407C R404A
R507
R134a R22 R407C R404A
R507
10
3,25
-
-
0,5
4,5
4
5
2
6,5
8
-
0,3
3
2,5
5
0
1
4,75
6,25
7,25
-1
1,8
1,3
3,5
-10
-0,75 2,25
3,25
4
-2,5
FS
-0,75
1
-20
FS
1,5
-1,8
-0,8
-30
-0,5
-2,3
Suction Superheat Table for Liquid Injection Valve Charges (K)
Charge Code
R134a
R22
R407C
R404A
R507
CL
-
15 K
13 K
22 K
GL
15 K
30 K
25 K
35 K
UL
30 K
45 K
40 K
Service Hints
Complaint
Possible Cause
Corrective Action
Regulator Leakage
Dirt in Regulator
Clean Regulator
Regulator hunting (chattering) – wide
fluctuation in controlled pressure
Regulator oversized
Refer to the selection table in Catalogue
Regulator and Evaporating Pressure Regulator have control
interaction
Move external equalizer line downstream from the
Evaporating Pressure Regulator
Regulator and Liquid Injection Valve have control
interaction
Increase superheat setting. Dampen bulb response by
repositioning
Regulator and cylinder unloaders have control interaction
Differential should be increased between the controls by
lowering the regulator’s set point
Regulator will not provide pressure
control
Pressure adjusting stem is set at a point so high that suction
pressure never reaches the set point
Re-adjust the regulator acc. to operating instructions
External equalizer line upstream of evaporating pressure
regulator
Move external equalizer line downstream from evaporating
pressure regulator
Strainer clogged at the regulator inlet
Replace strainer
MOPD exceeded across the solenoid or loss of supply
voltage
Replace solenoid or trouble-shoot the electrical problem
Solenoid coil burned out
Determine cause and replace coil
seat damaged due to foreign material
Change valve or orifice
Wrong type distributor for hot gas bypass to the evaporator
Install proper distributor for low pressure drop
Regulator fails to close
Dirt under seat of the regulator
Locate and remove dirt. Install strainer.
Pressure adjusting stem is set at a point so high that suction
pressure never reaches set point
Re-adjust the regulator acc. operating instructions
Blocked external equalizer
Locate and remove stoppage
Regulator is sized correctly but rated
capacity is not attained
Improper line sizing
Increase line size or increase size of regulator
