Electrolux FKCH17F7HW User Manual
REFRIGERATOR/FREEZER SERVICE MANUAL #5995519443 2008 ALL RIGHTS RESERVED
Convertible
Refrigerator / Freezer
Model FKCH17F7HW
Technical Service Manual
ELECTROLUX MAJOR APPLIANCES OF NORTH AMERICA
Basic Information
1-1
Section 1
Basic Information
Basic Information
1-2
Section 1 - Basic Information .............................. 1-1
Table of Contents.................................................... 1-2
Safe Servicing Practices ........................................ 1-3
Product Features .................................................... 1-4
Door Storage .......................................................... 1-5
Adjustable Door Bins .............................................. 1-5
Crisper Drawers ...................................................... 1-5
Adjustable Shelving ................................................ 1-5
Humidity Control ...................................................... 1-5
Serial Plate.............................................................. 1-6
Care and Cleaning .................................................. 1-6
Cleaning The Inside .......................................... 1-6
Cleaning The Outside ........................................ 1-6
Section 2 - Electronic Control
.............................. 2-1
Electronic Temperature Control .............................. 2-2
Switching Between Refrigerator and
Freezer Mode ........................................................ 2-2
Setting Selection .................................................... 2-2
Operation of Electrical Control Components .......... 2-3
Freezer and Refrigerator Modules.......................... 2-3
DPDT Rocker Switch ............................................ 2-3
Ambient Thermostat................................................ 2-3
Fan Relay................................................................ 2-3
Service Diagnostic Mode ........................................ 2-4
Initiate Service Mode .............................................. 2-4
Defrost Cycle Timing .............................................. 2-4
Manual Defrost Mode ............................................ 2-4
Compressor Delay Start.......................................... 2-4
Voltage Range ........................................................ 2-4
Error Indication........................................................ 2-5
Fail Safe Mode........................................................ 2-5
Stuck Key................................................................ 2-5
Exiting Fail Safe Mode............................................ 2-5
Section 3 - Refrigeration System
........................ 3-1
Definitions................................................................ 3-2
Safety Warnings...................................................... 3-2
Charging Sealed Systems ...................................... 3-2
Soldering ................................................................ 3-3
Basic Components.................................................. 3-3
Refrigerant Cycle .................................................... 3-3
Low/High Side Leak or Undercharge...................... 3-4
Testing for Refrigerant Leaks.................................. 3-4
Compressor Replacement ...................................... 3-4
To Flush the System................................................ 3-5
To Use Dry Nitrogen to Flush the System .............. 3-5
To Use Refrigerant to Flush the System ................ 3-5
Installing a New Compressor.................................. 3-6
Condenser Replacement ........................................ 3-7
Filter-Drier Installation ............................................ 3-8
Evaporator and Suction Line Replacement ............ 3-8
Equipment Needed for Evacuation & Recharging .. 3-9
Installing Evacuation and Recharging Equipment .. 3-9
Evacuating System.................................................. 3-10
Charging the System ..............................................3-10
Preparing the Charging Cylinder ............................3-10
Final Leak Test........................................................3-11
Verify Refrigerant Type in the System ....................3-12
Dedicated Equipment ............................................ 3-12
R-134a Refrigeration Systems .............................. 3-12
Miscibility of R-134a and Ester Oil ........................ 3-12
Water in the Refrigeration System ........................ 3-13
Vacuum Pump Maintenance.................................. 3-14
Refrigerant Leaks .................................................. 3-14
Leak Detection ...................................................... 3-15
R-134a Properties .................................................. 3-15
HFC-134a, CFC-12 Pressure Temp. Chart .......... 3-16
Inhalation Toxicity .................................................. 3-17
Cardiac Sensitization ............................................ 3-17
Spills or Leaks........................................................ 3-17
Skin and Eye Contact............................................ 3-17
Combustibility of HFC-134a .................................. 3-18
Leak Testing .......................................................... 3-18
Bulk Delivery and Storage .................................... 3-18
Filling and Charging Operations............................ 3-18
Refrigerant Recovery Systems.............................. 3-18
Thermal Decomposition ........................................ 3-18
Section 4 - Component T
eardown
Warnings and Cautions.......................................... 4-2
Exterior Components ............................................ 4-3
Door Handle...................................................... 4-3
Kickplate............................................................ 4-3
Door Hinge and Door Assembly ...................... 4-3
Door Stop.......................................................... 4-4
Door Gasket and Inner Panel .......................... 4-4
Gallon Door Bin ................................................ 4-5
Two Liter Door Bins .......................................... 4-5
Dairy Door ........................................................ 4-5
Door Switch ...................................................... 4-6
Interior Components .............................................. 4-6
Glass Shelf Assembly ...................................... 4-6
Crisper Drawer.................................................. 4-6
Crisper Cover Assembly .................................. 4-7
Light Shield ...................................................... 4-7
Light Fixture ...................................................... 4-7
Baffle Plate ........................................................ 4-8
Evaporator Cover.............................................. 4-8
Control Switch .................................................. 4-8
Electronic Control .............................................. 4-9
Evaporator Fan Assembly ................................ 4-9
Defrost Thermostat .......................................... 4-10
Defrost Heater .................................................. 4-10
Evaporator ........................................................ 4-10
Compressor Area Components.............................. 4-11
Power Cord ...................................................... 4-11
Filter-Drier ........................................................ 4-11
Compressor ...................................................... 4-12
Drain Pan and Drain Pan Heater Loop ............ 4-13
Condenser Service............................................ 4-14
Safe Servicing Practices
Avoid personal injury and/or property damage by
observing important Safe Servicing Practices.
Following are some limited examples of safe
practices:
1. DO NOT attempt a product repair if you have any
doubts as to your ability to complete the repair in a
safe and satisfactory manner.
2. Always Use The Correct Replacement Parts as indicated in the parts documentation. Substitutions may
defeat compliance with Safety Standards Set For
Home Appliances. Do not exceed maximum
recommended wattage on halogen bulb replacements. Doing so could blow fuses and/or damage
transformers.
3. Before servicing or moving an appliance:
• Remove power cord from the electrical outlet, trip
circuit breaker to the OFF position, or remove fuse.
• Turn off water supply if necessary.
4. Never interfere with the proper operation of any
safety device.
5. Use ONLY REPLACEMENT PARTS CATALOGED
FOR THIS APPLIANCE. Substitutions may defeat
compliance with Safety Standards Set For Home
Appliances.
6. GROUNDING: The standard color coding for safety
ground wires is GREEN, or GREEN with YELLOW
STRIPES. Ground leads are not to be used as
current carrying conductors. It is EXTREMELY
important that the service technician reestablish all
safety grounds prior to completion of service.
Failure to do so will create a hazard.
7. Prior to returning the product to service, ensure that:
• All electrical connections are correct and secure.
• All electrical leads are properly dressed and
secured away from sharp edges, high-temperature
components, and moving parts.
• All non-insulated electrical terminals, connectors,
heaters, etc. are adequately spaced away from all
metal parts and panels.
• All safety grounds (both internal and external) are
correctly and securely connected.
• All panels are properly and securely reassembled
Basic Information
1-3
Section 5 - Troubleshooting .............................. 5-1
Troubleshooting Chart .......................................... 5-2
Electronic Control Troubleshooting Chart ............ 5-4
Section 6 - W
ire Diagrams .................................. 6-1
Wiring Diagram .................................................... 6-2
Thermistor Resistance Chart ................................ 6-3
Section 7 - Inst
allation Information .................... 7-1
Important Safety Instructions .................................. 7-2
Location .................................................................. 7-4
Leveling .................................................................. 7-4
To Level Unit .......................................................... 7-4
Electrical Information .............................................. 7-5
Door Removal ........................................................ 7-6
Door Handle Mounting Instructions ........................ 7-6
Model FKCH17F7HWA Unit Dimensions................ 7-7
Basic Information
1-4
Product Features
Frigidaire refrigerator/freezers are designed for optimal convenience and storage flexibility. Use the illustration below
to familiarize yourself with product features and terminology.
Basic Information
1-5
Door Storage
Door bins, shelves, and racks are provided for
convenient storage of jars, bottles, and cans. Frequently
used items can be quickly selected. The dairy
compartment, which is warmer than the general food
storage section, is intended for short term storage of
cheese,spreads or butter.
Adjustable Door Bins
Some models have adjustable door bins that can be
moved to suit individual needs. (See Figure 1-1)
To move door bins
1. Lift bin straight up.
2. Remove bin.
3. Place bin in desired position.
4. Lower bin onto supports until locked in place.
Crisper Drawers
The crisper drawers, located under the bottom
refrigerator shelf, are designed for storing fruits,
vegetables, and other fresh produce. Wash items in
clear water and remove excess water before placing
them in the crisper drawers. Items with strong odors or
high moisture content should be wrapped before storing.
(See Figure 1-2)
Adjustable Shelving
Multi-position adjustable interior shelves can be moved
to any position for larger or smaller packages. The
shipping spacers that stabilize the shelves for shipping
may be removed and discarded. (See Figure 1-3)
Humidity Control
The Humidity Control, present on some models with
crisper drawers, allows you to adjust the humidity within
the crisper. This can extend the life of fresh vegetables
that keep best in high humidity. (See Figure 1-4)
Figure 1-1. Door Bins
Figure 1-2. Crisper
Figure 1-3. Adjustable Glass Shelves
Figure 1-4. Crisper Humidity Control
Locating Holes
Crisper
Humidity Control
Basic Information
1-6
Serial Plate
The serial plate is located inside the cabinet on the left
sidewall. The technician should always refer to the
serial plate to assure refrigerant type and quantity, as
well as electrical ratings and operating pressures.
(See Figures 1-5 and 1-6)
Care and Cleaning
• Damp objects stick to cold metal surfaces. DO NOT
touch interior metal surfaces with wet or damp
hands.
• The freezer must be unplugged (to avoid electrical
hazard) from power source when defrosting the unit.
Convertible model is frost free and will defrost
automatically, but should be cleaned occasionally.
Cleaning The Inside
After defrosting, wash inside surfaces of the freezer with
a solution of two (2) tablespoons of baking soda in one
(1) quart (1.136 liters) warm water. Rinse and dry.
Wring excess water out of the sponge or cloth when
cleaning in the area of the controls, or any electrical
parts.
Wash the removable parts with the baking soda solution
mentioned above, or mild detergent and warm water.
Rinse and dry. NEVER use metallic scouring pads,
brushes, abrasive cleaners or alkaline solutions on any
surface. DO NOT wash removable parts in a
dishwasher.
Cleaning The Outside
Wash the cabinet with warm water and mild liquid
detergent. Rinse well and wipe dry with a clean soft
cloth. Replace parts and food. Do not use razor blades
or other sharp instruments, which can scratch the
freezer surface when removing adhesive labels. Any
glue left from the tape can be removed with a mixture of
warm water and mild detergent, or touch the residue
with the sticky side of the tape already removed.
DO NOT REMOVE THE SERIAL PLATE.
Figure 1-5. Serial Plate
Figure 1-6. Serial Plate Location
Electronic Control
2-1
Section 2
Electronic Control
2-2
Electronic Control
Electronic Temperature Control
The electronic temperature controls are located on the
evaporator cover in the upper right hand corner.
(See Figure 3-1) The rocker switch controlling the mode
of operation is mounted to the top of the evaporator
cover. (See Figure 3-2) Temperature is factory preset
to provide satisfactory food storage temperatures.
The initial temperature setting "4" is displayed when
power is applied the very first time. After the initial
power up, the control will read the last saved setting.
Switching Between Refrigerator and Freezer Mode
The unit can be switched between operating as a
refrigerator or a freezer by pressing either the “R” for
refrigerator mode, or “F” for freezer mode. Positioning
the DPDT rocker switch in the middle position will
disable all cooling functions. (See Figure 3-2)
Setting Selection
For settings 1 though 7 when the UP button is pushed
(to increase temperature), the setting number will
decrease by one and when the DOWN button is pushed
(to decrease temperature), the setting number will
increase by one.
To turn the control off, go to temperature setting "1".
Then press the UP key three times within five seconds.
The display will show "0".
To turn the control on, press the DOWN key three times
within five seconds. The display will show "1".
When the temperature setting is changed to "0", the
compressor and defrost system will be turned off.
Figure 3-1. Electronic Controls
Figure 3-2. DPDT Rocker Switch
Freezer Control Refrigerator Control
Operation of Electrical Control Components
Freezer and Refrigerator Modules
The modules, when selected by the rocker switch, control the temperature of the unit by an internal thermistor
mounted on the circuit board. Each module has an individual service mode.
Each module has the following connections to the rear of the circuit board:
1= Neutral
2= Not Used
3= L1
4= Compressor
5= Defrost Thermostat
DPDT Rocker Switch
The DPDT Switch is connected to the household power
supply with L1 connecting to terminal 2, and the Neutral
line to terminal 5. (See Figure 3-3)
In refrigerator mode, The DPDT switch will have the a
closed condition between terminals 5&4, and 2&1.
In freezer mode, The DPDT switch will have the a
closed condition between terminals 5&6 and 2&3.
Ambient Thermostat
The ambient thermostat will close at 35°F (1.6°C) and
will then supply power to terminal 6 of the fan relay.
(See Figure 3-4)
Fan Relay
The purpose of the fan relay is to direct power to the
auxiliary heater and fan motor when ambient temperatures
go below 35°F (1.6°C) and the DPDT switch has
refrigeration selected.
Use an ohmmeter to test the fan relay. The following
conditions should result with the fan relay in the OFF state:
Between terminals 7 & 8 should read 4.4k Ohms.
Between terminals 6 & 2 and 5 & 1 - closed condition.
Between terminals 4 & 6 and 3 & 5 - open condition.
When voltage is supplied to terminal 6 through the
ambient thermistor, voltage will come out terminal 2
and connect with terminal 1.
Terminal 1 is connected to terminal 5 which feeds power to the evaporator fan motor.
The following conditions should result with the fan relay in the ON state:
Line voltage is supplied to terminals 7&8.
Between terminals 4 & 6 - closed condition.
Between terminals 6 & 2 - open condition ( cutting power to the auxiliary heater).
Between terminals 3 & 5 - closed condition (supplying line voltage to the fan).
Between terminals 5 & 1 - open condition
2-3
Electronic Control
Figure 3-4. Fan Relay Terminal Arrangement
Figure 3-3. DPDT Switch Arrangement
L1
DPDT
Switch
Nuetral
1
3
5
2
4
6
7
8
2-4
Electronic Control
Service Diagnostic Mode
Initiate Service Mode
The refrigerator and freezer controls have individual service modes. Each control assembly has a thermistor
embedded on the electronic control assembly circuit board.
To initiate service mode for the refrigerator or freezer control, set the control to “4” then press and hold the UP and
DOWN buttons for 3 seconds until the display changes to "8".
When the diagnostics mode is entered, the number "8" is displayed for three seconds indicating diagnostic mode.
After three seconds the numbered information below will be displayed in 3 second intervals and then the system will
then exit the diagnostic mode, automatically assuming the default temperature setting.
Changing the model number will cause the control to operate within parameters defined for other models.
1. “8” (7 segment display test)
2. Model ID (1)
3. SW Version (0)
4. Thermistor status
"C" for short
"O" for open
"-" for good thermistor
Defrost Cycle Timing
After each 12 hours of accumulated compressor runtime, a defrost cycle will be entered and last for thirty minutes.
The heater will be active until the defrost thermostat opens at 47° F, turning off the defrost heater. The defrost
thermostat closes at 37° F.
Manual Defrost Mode
When pressing both UP and DOWN keys for 3 seconds while on setting "2", the control will enter Manual defrost
mode. The display will show a "d". Manual defrost can be cancelled by again holding both UP and DOWN keys for
3 seconds. Manual defrost mode will terminate after the defrost cycle has completed. The control will resume normal
operation on setting "2".
Compressor Delay Start
When the compressor is turned off it will not start again for 13 minutes.
Voltage Range
The control operates normally down to a line voltage of 92 volts. Below this voltage, the compressor is turned off
and an "E" will flash for one second intervals on the display of the active electronic control assembly. Alow voltage
check should be done at the power supply outlet. The unit must have a minimum of 92 volts to operate.
Once the voltage rises above 92 volts, the control resumes normal operation.
2-5
Electronic Control
Error Indication
The following error conditions are monitored by each electronic control assembly:
1. Thermistor open or shorted. A defective thermistor will require that the affected electronic control assembly
be replaced.
2. Stuck Key (the key appears to be pressed for longer than 30 seconds).
3. Low Voltage (AC line voltage has dropped below 90 volts).
If any of these errors occur, the display will flash an "E" at one second intervals and the control will go into Fail Safe
Mode.
Fail Safe Mode
While in Fail Safe mode, the compressor will run constantly with a 30 minute defrost cycle every 12 hours.
Stuck Key
If either key is held in for more than 30 seconds the control enters fail safe operation.
Exiting Fail Safe Mode
Once a failure is resolved (thermistor, stuck key or low voltage), the control resumes its normal operating mode
under the setting it was at before the error occurred.
2-6
Electronic Control
Notes
3-1
Refrigeration System
Section 3
Refrigeration System
3-2
Refrigeration System
Instructions given here are furnished as a guide.
Persons attempting to use these instructions to
make repairs to the sealed refrigeration system
should have a working knowledge of
refrigeration and previous training on sealed
system repair, and an EPA certification for
servicing refrigeration systems.
The use of recovered refrigerant in the servicing
of products for in-warranty and out-of-warranty
repairs or for products covered by service
contracts is not permitted. Therefore, only new
refrigerant or refrigerant that has been reclaimed
back to new specifications by a
refrigerant manufacturer is to be used.
Effective July 1, 1992, the United States clean air
act governs the disposal of refrigerants such as
R-134a. Therefore, when discharging or purging
the sealed system use an EPA approved
refrigerant recovery system as outlined in the
final rule on the protection of stratospheric ozone
and refrigerant recycling, which was published in
the Federal Register May 14, 1993.
Definitions
Recovery:
To remove refrigerant in any condition from a system
and store it in an external container without necessarily
testing or processing it in any way.
Recycling:
To clean refrigerant for reuse by oil separation and
single or multiple passes through devices, such as
replaceable core filter-driers, which reduce moisture,
acidity and particulate matter. This term usually applies
to procedures implemented at the field job site or at a
local service shop.
Reclaim:
To reprocess refrigerant to new product specifications
by means which may include distillation, will require
chemical analysis of the refrigerant to determine that
appropriate product specifications are met. This term
usually implies the use of processes or procedures
available only at a reprocessing or manufacturing
facility.
Safety Warnings
Compressor Testing
Whenever testing a compressor, extreme caution should
be used to prevent damaging the terminals. A
compressor with a damaged terminal or a grounded
winding can expel a terminal from its insulated housing
when the compressor is energized. If this happens, a
mixture of refrigerant and oil will be released that could
be ignited by an external heat source (open flame,
heater, etc.). Also, if there is air in the system when this
happens, a spark at the compressor shell could ignite
the refrigerant and oil mixture.
Charging Sealed Systems
Overcharging a refrigeration system with refrigerant can
be dangerous. If the overcharge is sufficient to immerse
the major parts of the motor and compressor in liquid
refrigerant, a situation has been created which, when
followed by a sequence of circumstances can lead to
the compressor shell seam separating.
A hydraulic block occurs, preventing the compressor
from starting. This condition is known as locked rotor.
Electric current continues to flow through the
compressor motor windings which become, in effect,
electric resistance heaters. The heat produced begins to
vaporize the excess refrigerant liquid causing a rapid
increase in system pressure. If the compressor
protective devices fail, the pressure within the system
may rise to extremes far in excess of the design limits.
Under these conditions, the weld seam around the
compressor shell can separate with explosive force,
spewing oil and refrigerant vapor which could ignite.
To eliminate this exceedingly rare but potential hazard,
never add refrigerant to a sealed system. If refrigerant is
required, evacuate the existing charge and recharge
with the correct measured amount of the refrigerant
specified for the system.
1. All joints to be soldered must have proper fit.
Clearance between tubes to be soldered should be
from .001” to .006”. It is not practical to actually
measure this; however, you do not want a dry fit or
loose fit. Tubing joints should overlap about the
distance of their diameter except for restrictor tubes,
which should be inserted 1.25”.
2. Clean all joint areas with fine steel wool or
preferably an abrasive cloth, such as grit cloth
No. 23 or Scotch-Brite.
3. Apply a thin film of liquid flux recommended for
silver soldering to surfaces to be joined and to
surfaces immediately adjacent to joint.
4. Align tubing so no stress is on joint. Do not move
tubing while solder is solidifying or leaks will result.
5. Use a torch of adequate capacity so joint can be
quickly heated with a minimum of heat travel to
other points. Use a good grade of silver solder.
6. Solder connections. If tubing is properly cleaned
and fluxed, solder will flow readily. Use only enough
solder to make a good bond.
7. Allow joint to cool, then wash exterior with water to
remove flux.
Basic Components
The basic components of a refrigerator/freezer are a
compressor, condenser, evaporator, heat exchanger
(capillary tube and suction line) and drier.
Refrigerant Cycle
The refrigerant cycle is a continuous cycle that occurs
whenever the compressor is in operation. Liquid
refrigerant is evaporated in the evaporator by the heat
that enters the cabinet through the insulated walls and
by the heat from product load and door openings. The
refrigerant vapor is then drawn from the evaporator,
through the suction line to the compressor.
Compression raises the pressure and temperature of
the vapor in the compressor and the vapor is then
forced through the discharge valve into the discharge
line and into the condenser. Air passing over the
condenser surface removes heat from the high pressure
vapor which then condenses to a liquid. The liquid
refrigerant then flows from the condenser to the
evaporator through the small diameter liquid line
(capillary tube). Before it enters the evaporator, the
liquid refrigerant is sub-cooled in the heat exchanger by
the low temperature suction vapor in the suction line.
When refrigerant is added, the frost pattern will
improve, the suction and discharge pressures will rise,
the condenser will become hot and the wattage will
increase.
3-3
Refrigeration System
WEAR APPROVED SAFETY GLASSES WHEN
WORKING WITH OR ON ANY PRESSURIZED
SYSTEM OR EQUIPMENT. HAVE AN APPROVED
DRY TYPE FIRE EXTINGUISHER HANDY WHEN
USING ANY TYPE OF GAS OPERATED TORCH.
During application of heat, use wet cloths to
prevent heat from conducting to areas other than
the soldered joint. Use a sheet of metal or torch
guard pad as a heat deflector to keep flame away
from inflammable materials and painted
surfaces.
3-4
Refrigeration System
Low/High Side Leak or Undercharge
A loss of refrigerant can result in any of the
following:
1. Excessive or continuous compressor operation.
2. Above normal refrigerator/freezer compartment
temperature.
3. Apartially frosted evaporator (depending on amount
of refrigerant loss).
4. Below normal refrigerator/freezer compartment
temperature.
5. Low suction pressure (vacuum).
6. Low wattage.
The condenser will be “warm to cool”, depending on the
amount of refrigerant lost.
In the case of a low side refrigerant leak resulting in
complete loss of refrigerant, the compressor will run but
will not refrigerate. Suction pressure will drop below
atmospheric pressure and air and moisture will be
drawn into the system saturating the filter drier.
If there is reason to believe the system has operated for
a considerable length of time with no refrigerant and the
leak occurred in the low side of the system, excessive
amounts of moisture may have entered the system. In
such cases the two stage service Dryer Filter part
number 5303918288 and vacuum procedure listed
under Refrigerant Leaks need to be followed to prevent
repetitive service.
If a slight undercharge of refrigerant is indicated and no
leak can be found after a thorough leak test, the charge
can be corrected without changing the compressor.
If a high side leak is located and some refrigerant
remains in the system it is not necessary to change the
compressor.
Testing for Refrigerant Leaks
If the system is diagnosed as short of refrigerant and
the system has not been recently opened, there is
probably a leak in the system. Adding refrigerant
without first locating and repairing the leak or replacing
the component will not permanently correct the difficulty.
The leak must be found. Sufficient refrigerant may have
escaped to make it impossible to leak test effectively. In
such cases, add a ¼” line piercing valve to the
compressor process tube. Add sufficient refrigerant
vapor to increase the pressure to 40 to 50 lb. per sq. in.
Check the low side for leaks. Run the compressor 2 or
3 minutes and check the high side for leaks. Recover
refrigerant using an EPA approved recovery system.
Compressor Replacement
To check for contamination, obtain oil sample from old
compressor.
1. If the oil has burned odor, but no color change or
residue, then follow instructions on page 4-6
“Installing A New Compressor”.
2. If oil has a burned odor and a sugar or gritty feel as
well as showing signs of contamination (dark color),
follow instructions in next section, To Flush The
System. Remove as much of contamination as
possible from system before installing new
compressor and filter-drier.
The line piercing valve (clamp-on type) should be
used for test purposes only. It must be removed
from system after it has served its purpose.
It is recommended that system be flushed with
dry Nitrogen. However, if refrigerant is used to
flush the system you must look at the serial
plate to see what type of refrigerant is used in
the system. This is the only refrigerant that can
be used to flush the system and it must be
recovered.
NEVER install a new compressor without first
checking for possible system contamination.
3-5
Refrigeration System
To Flush The System
To Use Dry Nitrogen To Flush The System:
1. Remove compressor and filter-drier. Connect
process coupling to outlet tube of condenser.
2. Fasten cloth over other end of coil to prevent old oil
from spraying over room.
3. Connect hand shut-off valve on flushing hose to
process coupling.
4. Slowly open hand shut-off valve and allow nitrogen
to flow through condenser until discharge is clear.
5. Disconnect cap tube from evaporator. Flush
evaporator in same manner as condenser.
6. Flush cap tube. This is only possible if you have
proper service valve adapter.
7. Reassemble system.
DO NOT exceed 300 PSIG.
Use extreme care when using Dry Nitrogen to
flush systems. Pressure in nitrogen cylinder
could be as high as 2000 psi. Nitrogen cylinder
must be equipped with approved pressure
regulator and pressure relief valve. Ensure that
your hoses have adequate ratings for pressure
involved and that all of your equipment is in good
condition. The end of the flushing hose on this
tank regulator must be equipped with a hand
shut-off valve (Robinair No. 40380). Close hand
shut-off valve and adjust nitrogen regulator to
correct pressure before proceeding with flushing
procedure.
To Use Refrigerant To Flush The System:
1. Disconnect the suction and discharge lines from the
compressor and remove the filter-drier. Connect
process coupling to outlet and inlet tube of
condenser.
2. Connect hose to outlet process coupling and
charging cylinder. Connect another hose to inlet
coupling and recovery system.
3. Open charging cylinder and allow refrigerant to flow
through condenser until discharge into bag is clear.
4. Disconnect capillary tube from evaporator. Flush
evaporator in same manner as condenser.
5. Flush cap tube. This is only possible if you have a
proper service valve adapter.
6. Reassemble system.
The line piercing valve (clamp-on type) should be
used for test purposes only. It must be removed
from system after it has served its purpose.
DO NOT exceed 150 PSIG.
DO NOT exceed 300 PSIG.
Refrigerant used for flushing must be recovered
into a recovery system. Meter amount of
refrigerant used for flushing with your charging
cylinder. DO NOT OVERFILL THE BAG.
Loading...