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Emerson Climate Technologies
46
Oil Controls
Emerson Climate Technologies
OMB
Common Suction
To
Co
ndenser
Filter-Drier
Compressor
Discharge
OMBOMB
OMB
Oil Separator
Reservoir
Oil Controls
Any time that compressors are operated in a paral-
lel operation (Suction and Discharge lines manifolded
together), an oil control system in needed to ensure that
each compressor has enough oil to operate properly.
Oil control systems are sometimes as basic as a
common line connected between compressors to allow
oil and gas equalization. This is usually referred to as a
“passive” oil system. Although this may sufce on two-
compressor systems, compressor racks of three or more
compressors almost always have an “active” system
since even small differences in crankcase pressures can
cause oil starving. This system uses an oil separator to
capture most of the oil from the compressor discharge
gas since some oil is carried out of the compressor
with the refrigerant. Several types of oil separators are
commonly used in these applications. The older style is
called an impingement type while newer, more efcient
types are the centrifugal and coalescing types.
After the oil is separated from the refrigerant, it col-
lects in the bottom of the oil separator where it is fed
directly to the crankcase in a high-pressure oil system
using oil controls on the compressor crankcases.
OMB
Low-Pressure Oil System
High-Pressure Oil System
A low-pressure oil system incorporates a separate oil
reservoir which is downstream of the separator. Oil separators
in low-pressure oil systems have a oat valve in the bottom to
allow excess oil to pass to the reservoir whenever the level is
high enough in the separator to open the valve. The pressure
in the oil reservoir is usually held 20-30 psi above the crank-
case pressure through a differential check valve. This lower
pressure allows mechanical oil oats, which use a oat valve
which opens when the crankcase oil level falls below 1/sight
glass, to be used to feed oil into the compressor crankcases.
The mechanical oats cannot be used on high-pressure oil
systems because the oil pressure entering them would be too
high and cause them to not be able to control the oil level.
On all oil systems, it is important to install an oil lter
downstream of the oil separator to ensure a supply of
clean oil to the compressors.
Emerson Oil Controls
A high-pressure oil system can use an Emerson OMB
oil control mounted on the compressor crankcase. The
OMB is a device which uses a reverse Hall-effect mag-
netic oat to activate a solenoid to allow oil to ow into
the crankcase whenever the level falls below 1/2sight
glass level. It is designed to operate at oil pressures up
to 350 psid.
OMB
OMB
Common Suction
To
C
ondenser
Oil
Separator
Filter-Drier
Reservoir
Differential
Pressure Valve
OMB
Compressor
Discharge
- Technical 1
- Help Guide 1
- Introduction 3
- Table of Contents 4
- Thermal Expansion 5
- Thermal Expansion Valves 6
- Internal Equalizer 6
- Factory Settings of TXVs 7
- External Equalizer 7
- Superheat 9
- Approximate Methods 9
- Superheat Adjustment 9
- TXV Selection 10
- Application Tips 11
- Remote Bulb Well 11
- Remote Bulb Location 11
- Operation at Reduced Capacity 12
- Gas & Gas Cross-Charges 14
- Which Charge to Use? 14
- Adsorption Charges 14
- Liquid Cross-Charges 14
- Other TXV Considerations 15
- Refrigerant Code Names 16
- Emerson MOP 16
- TXV Charge Code Selector 17
- Electronic Valves 18
- & Controls 18
- Electronic Valve Applications 19
- Emerson Climate Technologies 20
- EC3-32 and EC3-33 Systems 20
- Temperature Sensor ECN-N60 20
- Pressure Transmitter – PT4 21
- TXV Controller – EC3-X32 21
- TXV Controller – EC3-X33 22
- Universal Driver – EXD-U00 22
- XEV22 Superheat Controller 22
- Electrical Control Valve – EX 23
- Third Party Controller 23
- Electronic Valves Programming 24
- Solenoid Valves 25
- What Are Solenoid Valves? 26
- 2. Pilot Operated Valve 27
- Types of Solenoids 27
- 2-Way Valves 27
- Solenoid Valve Selection 28
- Application Overview 29
- System Protectors 30
- Absorption vs. Adsorption 32
- Types of Filter driers 32
- Dirt, Waxes, Acid 32
- Sightglass 33
- Suction Filter Driers 34
- Internal Design 35
- Compressor Burnout 36
- Filter Driers for Heat Pumps 37
- Removing Contaminants 37
- One-Way Flow, Both Directions 37
- Simplifying While Servicing 38
- Emerson System Protectors 38
- Regulators 39
- EVAPORATOR 40
- INTERMEDIATE 40
- Figure 3: EPRB(S) Brass Body 41
- (Emerson EPRB) 42
- HeadMaster HP Operation 43
- solenoid VAlVe 46
- Figure 8 47
- Adjusting the Set Point 48
- Oil Controls 49
- Emerson Oil Controls 50
- Temperature 51
- Pressure Controls 51
- Temperature Pressure Controls 52
- TS1 Introduction 52
- Housing Variants 52
- Temperature Sensing 52
- Setpoints 53
- Electrical Contacts 53
- Contact Function 53
- PSC Pressure Switch 56
- PSC Introduction 56
- FSX Introduction 57
- Basic Rules of 58
- Good Practice 58
- Basic Rules of Good Practice 59
- Troubleshooting 61
- SYSTEM TROUBLESHOOTING GUIDE 62
- No Superheat At Start Up Only 63
- Superheat Is Erratic Or Hunts 63
- Troubleshooting Ball Valves 68
- Troubleshooting Regulators 69
- R404A/R507A 70
- Wholesaler/Contractor Support 72
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