EdgeStar OR320SS User manual

EdgeStar, 8606 Wall St, Suite 1800, Austin, TX 78754
support.edgestar.com • [email protected] • edgestar.com
Document Type: Service Manual
Version: V1.0 01242018

CONTENTS
CONTENTS.................................................................................................................................... 1
SAFETY PRECAUTIONS............................................................................................................. 1
SPECIFICATIONS......................................................................................................................... 4
PARTS BREAKDOWN................................................................................................................. 5
TECHNICAL INFORMATION..................................................................................................... 7
WIRING DIAGRAM...................................................................................................................... 8
CONTROL SYSTEM..................................................................................................................... 9
SERVICE DIAGNOSIS OVERVIEW......................................................................................... 10
SERVICE AND DISASSEMBLY STEPS................................................................................... 10
SAFETY PRECAUTIONS
WARNING: This manual and the information contained herein is intended for use
by certified technicians. The manufacturer or seller is not responsible for the
interpretation or misuse of the information provided, nor does it assume any
liability in connection with its use.
The safeguards and warnings indicated in this manual do not cover all possible
conditions which may occur. Common sense, caution, and care must be
exercised.
To prevent electric shock, always unplug an appliance from the power supply before attempting
any service.
Disconnect the power cord by grasping the plug, not the cord.
Do not bypass, cut, or remove the grounding plug.
Prevent water from spilling onto electric elements or the machine parts.
Always refer to the rating label on the appliance for rated current and voltage.
Always check line voltage and amperage.
Always use exact replacement parts.
Any attempt to repair a major appliance may result in personal injury and property damage.

Electrical Safety
Do not exceed the power outlet ratings.
It is recommended that the unit be connected to its own circuit.
A standard electrical supply (120V, 60Hz), that is properly grounded in accordance with the National
Electrical Code and all state and local codes and ordinances is required.
Do not use outlets that can be turned off by a switch or pull chain.
Always turn the unit off and unplug it from the outlet when cleaning.
Unplug the unit if it is not going to be used for an extended period of time.
Do not operate the unit with a power plug missing the ground plug, a damaged cord, or a loose socket.
Be sure the appliance is properly grounded.
Do not bypass, cut, or remove the grounding plug.
If the power cord is damaged, it must be replaced by the manufacturer or a qualified technician.
Do not use extension cords or power strips with this unit. You may need to contact an electrician if it is
necessary to use a longer cord or if you do not have a properly grounded outlet. Do not modify the power
cord’s length or share the outlet with other appliances.
Do not start or stop the unit by switching the electrical circuit’s power on and off.
Immediately unplug the unit if it makes strange sounds, emits an odor or smoke and contact customer
service.
Do not remove any part of the casing unless instructed by an authorized technician.
Before the appliance is removed from service or discarded, remove the door and cut off the power cord.

General Safety
Always unplug an appliance from the power supply before attempting any service. Disconnect the
power cord by grasping the plug, not the cord.
Do not allow children or pets to play on or in the appliance.
This machine is not intended for use by persons (including children) with reduced physical, sensory or
mental capabilities, or lack of experience and knowledge, unless they have been given supervision or
instruction concerning use of the machine by a person responsible for their safety.
Do not install or store this appliance where it will be exposed to the weather.
Disconnect from the power socket before cleaning or maintenance.
If the plug (power cord) is damaged, it must be replaced by the manufacturer or an authorized service
representative.
This machine shall be repaired only by an authorized service representative. Only genuine
replacement parts should be used.
If connected to a circuit protected by fuses, use time-delay fuses with this appliance.
Do not lean items against the glass door.
Please do not close the door with excessive force. If it is found difficult to close the door, please check
for obstruction.
When you plan to dispose of this unit in the future, please comply with the local waste disposal
regulations. Remove the door so that children and pets will not be trapped in the unit.

Specifications
OR320SS
Rated Voltage
115V AC
Rated Frequency
60 Hz
Rated Current
2 A
Power consumption
140 W
Net Weight
69 lbs
Refrigerant Type
R134a
Refrigerant Amount
1.94 Oz.
Design Pressure
90~190 Psi
Door Type
Stainless Steel
Frame
Stainless Steel
Lamp
9W Fluorescent Light
Controller system
Mechanical Thermostat
LCD display
N/A
Error Alart
N/A
Control Part
Pressure Type Thermostat ×1
Metal Expansion Type Thermostat ×2
Heater
PTC Heater 75W
Compressor
Model: OF789D
115V, 1PH, 60Hz, FLA1.6A, LRA9A
Flow Capacity of
Capillary
6.8±0.2L/min @1Mpa
Dryer filter
15g XH-9 molecular sieve
Evaperator Fan
SA1225A1
Condenser Fan
SA1225A1

Parts Breakdown
Exploded View of OR320SS

Parts List
Number
Description
1
Door handle
2
Stainless steel door
3
Magnetic rubber gasket
5
Evaporator fan
6&31&32&37
Shelves
7
Lamp cover
8
Lamp
11
Evaporator
13
Temperature Control Knob
14
Thermostat (Pressure type)
15
PTC heater
16&24
Thermostat (Metal expansion type)
17
Top hinge
18
Top hinge cover
20
Adjustable foot
22
Water pan
23
Compressor
26
Power cord
27
Condenser fan
28
Bottom hinge
29
Filter Dryer
34
Condenser
36
Ballast
38
Filter
39
Louver
41
Light switch

Technical Information
Refrigerant Cycle

Wiring Diagram

Control System
This model has three thermostats: one pressure type thermostat and PTC heater for the
compressor and evaporator fan, and two metal expansion types (one in the base plate and the
other in the cabinet.)
Pressure type Thermostat
Hi-point close temperature: 14±2℃
Hi-point open temperature: 8±2℃
Lo-point close temperature: 5±1.5℃
Lo-point close temperature: -1±1.5℃
Metal expansion type Thermostat
Control Type: S.P.S.T
Open Temperature range: 6±2℃
Close Temperature range: 2±2℃
Locating the Thermostats
Evaporator fan plate Base plate
Lamp control: Ensure light on and evaporator fan off when door is open. Please see wiring
diagram.

Service Diagnosis Overview
Malfunction Category
Check Point
Unit Does Not Run
Unit plug and wall socket
Compressor Delay
Control Board and Transformer
Compressor Starter Relay and Overload Protector
Wiring Connections
Compressor
Unit Does Not Cool
Low Refrigerant Charge or Leak
Detecting and Repairing Leaks
Pulling Vacuum and Recharging
Unit Does Not Have Refrigerant
Issue but Still Does Not Cool
Environmental Conditions
Door and Door Seal
Fans
Unit Too Noisy
Level Unit
Refrigeration Lines
Screws, Bolts and Fasteners
Light Does Not Work
Tightening Bulb
Replacing Bulb
Service and Disassembly Steps
Tools Required
Phillips Head Screwdriver
Flat Head Screwdriver
Pliers
Multimeter

Unit Does Not Run
Troubleshooting Overview
STEP
Possible Cause
Correction
Remark
1
The Unit is unplugged.
Plug in.
If problem continues go to step 2
2
Socket not correct voltage or
is damaged.
Check and repair or replace.
If problem continues go to step 3
3
Compressor protected by
internal delay timer.
Wait 5-10 minutes for compressor
to start.
If problem continues go to step 4
4
Control board and/or
transformer defective.
Replace board and transformer.
If problem continues go to step 5
5
Compressor relay and/or
overload protector defective.
Replace the relay and overload
protector.
If problem continues go to step 6
6
Wire connection loose
Check and re-connect according
to wiring diagram
If problem continues go to step 7
7
Compressor defective
Replace compressor
Service Instructions
1.0
Ensure the power plug is installed
properly.
If not, connect to an appropriate 120V
power supply.
2.0
Check the voltage of the socket. The
voltage should read around 120V.
3.0
The compressor is protected by an internal delay timer to protect it. After plugging the unit in it may
take 5 minutes or more for the compressor to start. After giving it time to power up touch the
compressor with your hand. If you feel vibration the compressor is running normally. If not, continue
to step 4 and replace the control board and transformer.

4.0
Accessing Components for Testing / Replacement
To remove the back cover of the unit.
Remove the five (5) screws.
Remove the back cover and set aside for later use.
4.1
Disconnect the power cord from the outlet,
Remove the screws on the control board cover.
4.2
Remove the cover
4.3
Remove the terminals and replace the main control
board and transformer.
4.4
Reinstall the control box cover. Plug the unit into the wall outlet and confirm the compressor is
working correctly. If unit is running, replace the back cover. If not, continue to step 5 and replace the
starter relay and overload protector.
5.0
Replace the starter relay and overload protector on the compressor.

5.1
Using a flat head screw driver, remove the cover
on the side of the compressor that houses the
relay and overload protector.
5.2
Remove the wiring bracket screw and the
ground wire screw.
5.3
Remove and replace relay and overload
protector and reconnect them to the compressor.
5.4
Reinstall the wiring screws and component cover. Plug the unit into the wall outlet and confirm the
compressor is working correctly. If unit is running, replace the back cover. If not continue to step 6
and check unit for loose wires.
6.0
Using the wiring diagram check all wiring connections and make sure all connections are secure.
Repair any loose or broken connections. Plug the unit into the wall outlet and confirm the
compressor is working correctly. If unit is running, replace the back cover. If not, continue to step 7.
7.0
If all the above steps have been performed correctly and the compressor will still not run the
compressor is defective and needs to be replaced.

Unit Does Not Cool
Troubleshooting Overview
STEP
Possible Cause
Correction
Remark
1
Low refrigerant charge or
leak in system.
Check discharge and suction pipes
from compressor.
Continue to step 2
2
Discharge pipe not hot and
suction pipe not cool.
Check system for leak(s) and repair.
Continue to step 3
3
Unit needs to be recharged
with refrigerant.
Attach vacuum pump and pull
vacuum on system.
Continue to step 4
4
Recharge with proper
amount of refrigerant.
Weigh in charge or use watt meter to
charge to appropriate level.
Continue to step 5
5
Seal system and test unit
Service Instructions
1.0
If after the compressor has been on for some time the temperature in the cabinet remains
unchanged, check whether or not there is a low charge or leak in the refrigeration system.
1.1
If the compressor is vibrating when you touch it by hand it shows compressor is working.
Steps 1.2/ 1.3 are key symptoms of low refrigerant or a refrigerant leak.
1.2
If the discharge pipe isn’t hot when you touch it by
hand after the compressor has been running for a
period of time continue to 1.3.
1.3
The suction pipe isn’t cool when you touch it by hand
even after the compressor has been running for a
period of time continue to 1.4.
1.4
If both 1.2 & 1.3 are true then we can assume the unit has a leak or low charge.
Follow the steps below on how to repair.

2.0
Attach a Piercing Valve to the Suction Pipe on the
Compressor and Skip to 2.5. If no piercing valve is
available continue to 2.1.
2.1
Cut off the process tube.
2.2
Remove the process tube.
2.3
Replace process tube preferably with a built in
gauge/vacuum connector (below.) Braze in the new
process tube with a bead of brazing solder.

2.4
If the new process tube does not come with a
gauge/vacuum connector, attach a connector to the
end of the process tube.
2.5
Charge the Unit with Nitrogen.
Connect the Nitrogen to the Piercing Valve or
Process Tube and Fill unit to a Pressure of 145PSI or
1Mpa.
2.6
Check ALL brazing points for leaks.
Cover each brazing point with Soapsuds. A Spray Bottle, Towel and/or Brush are good methods of
applying suds. If there are Bubbles it means there is a Leak!
2.7
Re-braze the areas where there are leaks.
2.8
Repeat steps 2.6 and 2.7 until there are no leaks.

3.0
Once ALL leaks have been repaired release any remaining nitrogen. Connect the unit to a vacuum
pump and apply vacuum for no less than 20 minutes to remove the nitrogen and other objects from
the refrigeration system.
4.0
Charge the unit with refrigerant until the watt meter indicates a proper charge. You may weigh in the
appropriate charge if no watt meter is available.
5.0
Close the Piercing Valve or clamp the process tube, make it flat and seal after ensuring there is no
leakage.
5.1
Connect the unit to the power supply and check for any problems.
Install the back panel.

Unit Does Not Have Leak or Refrigerant Issue but Still Does Not Cool
Enough
Troubleshooting Overview
STEP
Possible Cause
Correction
Remark
1
Environmental conditions or
faulty door seal.
Check for heat sources around unit
and make sure door seals correctly.
If unit still does not cool
continue to step 2
2
Defective fan.
Replace fan.
Service Instructions
1.0
Avoid installing the unit where it is exposed to direct sunlight, where there is an ambient
temperature of more than 90 degrees F or adjacent to a heat source.
1.1
Check whether the door is firmly closed or if the door has been left open for too long.
1.2
Check and ensure the door gasket is not
damaged.
1.3
If the door shuts firmly and the door gasket is not damaged you will need to check the fan motor.
2.0
Remove the back panel by removing the (4) four screws. (As shown previously)
2.1
If the fan motor is not running while the compressor is working, please repair / replace it following
these steps.
2.2
Check the Fan Motor.
2.3
Remove the screws from the fan motor housing.

2.4
Remove the fan motor.
2.5
Disconnect the fan motor from the control board.
2.6
Connect the new fan motor.
2.7
Install the new fan motor.
2.8
Reinstall the back panel as previously shown.