Dinex MOC20 Service Manual
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Cleaning Instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Electrical & Refrigeration Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Accessing & Cleaning of Compressor Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Simplicool Refrigeration Unit Change Out. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Replacement of Danfoss Cold Thermistor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Danfoss Control Location & setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Return Air Vents (Hot & Cold) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Removal of the Hot Box Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Replacement Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Electrical Wiring Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Dinex® Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
MOC20
H OT / COLD CA R T Se r v i c e Ma n u a l
DINEX INTERNATIONAL, INC. • 628-2 HEBRON AVENUE, GLASTONBURY CT 06033 • WWW.DINEX.COM
For Service Information, call 1-888-673-4639
Please provide following information:
• Model number
• Serial number
• Part Description and number as shown in parts list.
Manual No. MOCMANUAL Rev-06/07Printed in the USA
SET UP
Carefully uncrate the unit.Re m o ve all loose packing
m a te r i a l , m a k ing sure that no small parts or acce s s o ries
a re lost. I n s pe c t the unit for co n cealed damage be fo re
d i s c a rding the packing mate ri a l .
NOTE: It is the responsibility of the installer to comply with
all local codes.
IMPORTANT: The hot and cold controls are factory set.
Never attempt to change these settings. All control setting
changes must be performed by a qualified technician.
The unit is now re a dy for use. It is impo rt a n t that at
l e a s t
1 2 ” of open airspace be maintained at the louve red panels.
I m p r o per air flow thru
the re f ri g e ration co m p res sor ca n
lead to inadequate coo l i n g , ove rh e a ting and damage to the
co m p re s s o r. Such a condition will void the wa rra nty.
The basic operation of the MOC20 is a dual compartment
cart that holds pre-plated meals on hot and cold trays.
This unit is designed for hospital/health care food service
operations that use cook-serve meal preparation. The
MOC20 is independently powered, meaning that it is not a
static cart and plugs in to any 120vac single phase, 20 amp
(NEMA 5-20R) dedicated receptacle. The MOC20 uses separate sides to maintain hot and cold food temperatures via
gentle convection heating and a built in refrigeration system. It accomplishes this by using heated forced air via a
blower/heated coil system and forced cool air via the
Simplicool/Danfoss refrigeration system.
1. To start the unit, simply plug it into a 120 VAC 20 amp
dedicated receptacle. Since the unit draws 15.5 amps at
startup, a dedicated receptacle is required.
2. Close the doors and allow the unit to precool and
preheat for 20 minutes. Next,load the trays of food into
the cart. Keep the doors closed as much as possible.
Door(s) left open for extended periods of time will
greatly affect food temperatures.
3 . The refrigeration system is design to operate for 30
minutes and then automatically go into a 5 minute
defrost. During the 5 minute defrost cycle, the compressor
shuts down. Thus when looking at the thermometers
located on the side of the unit, temperatures will rise to
approximately 210/215 degrees F. on the hot side and
up to approximately 55 degrees F. on the cold side. Once
the defrost ends, the temperatures will level out in
approximately 10 minutes.This fluctuation does not
affect food temperatures.
You have just purchased the new Dinex Equipment. Please
read this manual for helpful guidelines on how to use your
Equipment. Should you have any questions concerning
the Equipment, please call the Dinex Hotline at 1-888-6734639 (Monday through Friday from 8 am to 5 pm, Eastern
Standard Time).
IMPORTANT: For your safety,read and follow all cautions,
information and warnings
FREIGHT DAMAGE CLAIMS
Your Dinex Equipment was carefully inspected and packed
before leaving our plant.The transportation company
assumes full responsibility for the safe delivery of the
Equipment. Dinex does not assume any responsibility for
damage or loss incurred in transit. Please note any visible
damage or loss on the freight bill and have delivery personnel sign.
A freight claim should be filed immediately with the transportation company.If concealed damage is discovered
after unpacking the Equipment, please file a concealed
damage claim with the transport company within 10 days
after receipt of the goods.
IMPORTANT: All packing materials should be retained for
return shipment.
SAFETY
The instructions contained in this manual provide important guidelines for the Equipment user regarding a correct
and safe installation. Particular attention should be paid to
the warnings given in various parts of this manual. Never
dismantle and/or repair the appliance with the power supply in place. Service work must be performed by qualified
personal.
INFO: Please note that this appliance is for commercial
use only and must be used exclusively for the purposes
prescribed.
Page 2
Introduction
Operation
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CLEANING INSTRUCTIONS
WARNING: Never spray or pressure wash this equipment.
Such action can cause damage to the electrical component, could cause serious electrical shock and will
completely void the equipment warranty.
WARNING: Cleansers,detergents,sanitizers or bleaching
agents that contain chlorides or phosphates will cause
permanent damage to stainless steel and aluminum
products.The damage can appear as pits, severe discoloration, dulling of the finish and rust on stainless steel.This
damage is permanent and will void the equipment warranty.
Prior to cleaning, unplug the cabinet from the electrical
power source. Using a mild soap and water,or other
cleaners or sanitizers approved for stainless steel, wipe
down the interior and exterior of the unit.This mild
solution can be used as well on the center wall silicone
rubber air dams/wipers. Do not use excessive water.
Once clean, wipe dry with a soft cloth.
IMPORTANT: There are hot and cold air discharge open-
ings located in the center of the inter compartments.There
are also return air holes located on each side of the inter
compartment. Never allow water and cleaning solutions
to enter these openings. If this occurs, the moisture will
damage the internal electrical components and void
the warranty.
ELECTRICAL AND REFRIGERATION SPECIFICATIONS
Electrical: 120 VAC 1 phase 15.5 amps. Dedicated receptacle
required. Refrigeration: R134A Freon, charge is 10.5 ounces,
high side pressure is 197 psig & low side pressure is 104 psig.
Mo nt h l y , check the condition of the co m p res sor filter and
clean as needed.No te that a dirty filter will affe c t the pe rfo rm a n ce of the re f ri g e r ation sys te m , cause damage to the
co m p ressor and may void the equipment wa rra nty. For
f i l ter access and cleaning instru c t i o n s , re f er to the
“Ac cessing and cleaning of the Fi l te r”s e ction in this manual.
IMPORTANT:
This procedure is not covered under warranty
and is the responsibility of the facilities maintenance/
engineering department. Such procedure must be
performed by a qualified technician.
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1. General Safety and trouble shooting tips:
a. Safety: When troubleshooting unit, make sure to
disconnect the unit from the electrical power
source. Do this by unplugging the unit from the 120
Volts, AC power source. Once the panels have been
removed,a qualified & trained technician can electrically energize the unit for troubleshooting purposes.
b. Also, at the terminal block, check for intermittent
contact that occurs when a wire of a thicker gauge
contacts an adjoining wire that is on a different
circuit. Check for integrity of electrical wiring and
connections. Check to see that all fork or ring terminals are tight on terminal board, heater and relay.
Also check for intermittent contact made if a wire of
thicker gauge is next to the wire in question. Check
for tightness of wire nuts and all other electrical connections. Check electrical wiring for chafing and
insulation tears.
2. Unit is not Heating:
NOTE: If the unit is heating, but not at its maximum
performance level, check the return vent holes located
on the inside side panels. The five (5) return holes located
toward the center of the cabinet must be plugged. See
“RETURN AIR VENTS (HOT & COLD)” on page 7 of
this manual.
a. If unit is not heating and all wiring is determined to
be in good order: First,note whether the unit is
heating up to 160° F. This should take about 30
minutes and can be verified by placing a thermocouple or thermometer in the bottom of the heated
compartment. The thermometer or thermocouples
should read 140° F -160° F. If not:
b.
Check to see if the 3300 Cal controller is reading 160° F
.
If not, reprogram the controller. This controller is
located inside a lower access panel. Note that when
the controller is operating properly, the temperature
display will read 157° to 167° F. Also, there will be a
flashing LED apparent on the left hand corner of the
controller. If programmed properly:
c. Check to see if relay is energized. If so, go to next
step. Check for mechanical binding or chattering
(usually repetitive). If so then replace relay. Please
note that the controller circuitry has a certain amount
of capacitance, meaning that there is enough charge
to hold the NO (normally open) set of contacts on the
relay closed until such time that the controller
de-energizes (approximately 160° F).Thus, if checking
the relay with an ohm meter, the contacts should
show continuity,or if checking while electrically
energized,there should be 120 volts across the
terminals.This will hold true until the Cal 3300
controller senses a temperature of approximately
160° F. However, since the unit has a heating issue, at
this point in the troubleshooting process, the Cal
3300 controller should not be showing this reading.
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Page 3
Maintenance
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Troubleshooting
c. Determine if unit is performing the proper 30 minutes
cool cycle, followed by a 5 minutes defrost cycle. After
every 30 minutes, the unit will go into an automatic 5
minute defrost. During the 5 minute defrost cycle, the
compressor shuts down. Thus, during this period,
when looking at the thermometers located on the
side of the unit, the hot temperature will rise to
approximately 210/215 degrees F. During this period,
the cold thermometer will rise to approximately 55° F.
Once the defrost cycle ends, the hot & cold temperatures will level out in approximately 10 minutes. If
cycling properly:
d. Check the continuity of the cold Side Thermistor at the
Danfoss control. If no continuity, replace the
Thermistor. To do this, the complete Simplicool
refrigeration unit will have to be removed from the
cabinet. See: Simplicool Refrigeration Unit Change
Our Instructions” on page 5 of this manual. Once the
Simplicool system has been removed, see section
“Replacemant of Danfoss Cold Thermistor” on Page 7
of this manual. If O.K.:
e. Check the Danfoss control to make sure that it is at
the proper setting. See “Danfoss Control Location
and Setting” section on page 7 of this manual. To
properly set the Danfoss control, turn the stem
clockwise as far as it will go. If O.K.:
f. Check the seal between the Simplicool refrigeration
unit and the cabinet. There must be a good seal
between the Simplicool unit and the cabinet bottom.
First make sure that the Simplicool refrigeration unit
is sitting properly on the support pedestals with Split
Washers and that the Rear Retainer bracket is in
place. See section “Simplicool Refrigeration Unit
Change Out Instructions” on page 5 and refer
specifically to figures 1, 2 & 5.
g. Check the operation of the Simplicool refrigeration
unit. If faulty, it can not be repaired. Contact Dinex for
a replacement unit. If under warranty,the faulty unit
can be exchanged for a new one. For out of warranty
units, a new unit can be purchased and a partial
credit given for the return of the failed unit.To
replace the unit, refer to the “Simplicool Refrigeration
Unit Change Out Instructions” on page 5 of this manual.
IMPORTANT:
The following troubleshooting steps may
require the removal of the “Hot Box Assembly”.
NOTE:
The Hi-Limit Thermostat, Hot Side Thermocouple and
the Blower Assembly are all located in this box.
See section “Removal of the Hot Box Assembly” on page 8
of this manual.
d. Next, check the heating element:First, energize the
unit and check the voltage across the heater terminals.
If no voltage reading, check internal electrical wiring to
the element. If there is 120 volts across the heater
terminals, clamp an amp meter around one of the
heating element lead wires. The heating element is
rated 120 VAC, 1100 watts, thus, the amp meter should
read approximately 9 amps. If not,replace the heating
element. If so,the heating element is O.K.:
e. Perform a continuity check on the hot side thermo-
couple.This thermocouple can be accessed at the Cal
3300 controller.If no continuity, replace the thermocouple. If O.K.
f. Check the hi-limit thermostat for continuity.Since the
unit is not heating, the hi-limit thermostat should be
closed. If not, replace it. Please note that this hi-limit
thermostat is set to open at 300 F. Its sole purpose is
to act as a safety device. If hi-limit is O.K.:
g. Check blower assembly.See if motor is running. There
should be some motor/blower wheel vibration. Also,
an air flow should be felt from inside the heated compartment. If not, check for 120 volts at the motor. If
there is not 120 volts, check internal wiring. If so, and
the air flow does not seem to be adequate, if available,
use an Anemometer to measure the air flow. To do
this, remove the air plentum from inside the cabinet
and check the air flow. The air flow should be from
700 to 900 FPM. If not, replace the blower assembly.
3. Unit Not Cooling:
a. Make sure that all of the electrical wiring is in order;
next make sure that there is approximately 12”of
open air space at the louvered panels located in the
lower portion of the cabinet. Improper air flow thru
the louvered panels can cause improper cooling. This
condition can also cause overheating of the compressor and void the equipment warranty. If there is proper
air space:
b. Check to see if the filter located behind one of the
louvered panels is dirty. To access the filter see section
“Accessing and Cleaning of the Compressor Filter”on
page 5 of this manual. Please note that the cleaning of
the air filter is not covered under warranty.
If filter is clean:
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Page 4
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