Marvel 30WCM User manual

MARVEL MICROSENTRY™ REFRIGERATION MONITOR
Service Manual
MicroSentry™ Refrigeration Monitor
For Models:
30WCM & 61WCM Wine Cellars
3BARM & 6BARM Beverage Centers

MICROSENTRY™ REFRIGERATION MONITOR
Table of Contents
Section Page
Section 1: Introduction
1.1 Unit Specifications 1
1.2 Serial Nameplate 1
1.3 Before Servicing 1
1.4 Basic Refrigeration Tools 2
1.5 Installation 2
1.6 Electrical Requirements 2
Section 2: Sealed System
2.1 Introduction 3
2.2 Low Side Leaks 3
2.3 High Side Leaks 3
2.4 Restricted Capillary Tube 3
2.5 Access Valves 3
2.6 Evaporator Frost Pattern 4
2.7 Pressure and Temperature 4
2.8 Re-charging 5
Section 3: Sealed System Components
3.1 Access to Mechanical Baseplate 6
3.2 Compressor 7
3.3 Condenser 9
3.4 Evaporator 10
Section 4: System Components
4.1 Condenser Fan 11
4.2 Sensors 12
Section 5: User Interface and MicroSentry™ Refrigeration Monitor
5.1 Introduction 14
5.2 Starting the Unit 14
5.3 Adjusting the Temperature Mode 14
5.4 Interior Light and Switch
5.5 Warning Alarms 15
5.6 Audible Alarm Mute 15
5.7 Error Code Detection
Section 6: Interior Components
6.1 Lights 18
6.2 Racks 18
Section 7: Wiring 20
Section 8: Ordering Parts 24
Section 9: Service Parts 25
Section 10: Troubleshooting Guide 26

MICROSENTRY™ REFRIGERATION MONITOR
Section 1: Introduction
1.1 Unit Specifications
The unit specifications will vary among the models listed in this service manual. Refer to Table A below for unit
specifications related to the model that you are servicing.
Table A: Wine Cellar & Beverage Center Unit Specifications
Cabinet Dimensions (in)
Weight
(lbs)
Electrical
Require-
ments
Power
Cord
Length
(ft)
Com-
pressor
Refrig-
erant
Charge
(oz)
System
Refrig-
erant
Control
Temperature
Control
Con-
denser
Fan
Motor
Evapo-
rator
Fan
Motor
Height Width Depth
30WCM 34 1/4 14 7/8 21 1/4 100
115VAC/
60 Hz 7Piston type
2.8
Capillary
tube
Electronic
Control with LED
display, thermis-
tor input, and
MicroSentry™
System
2.3 W/
1300
RPM
12VDC
3BARM
61WCM
34 23 7/8 22 130 3.6
6BARM
1.2 Serial Nameplate
The serial nameplate is located inside of the unit on the upper left hand wall. The serial number will need to be
given when inquiring about the unit or ordering parts. See Figure 1.1 below for a sample serial tag with manufac-
turing date code logic.
Figure 1.1
1.3 Before Servicing
Always disconnect power to any Marvel product before attempting to service it. Always verify that power has•
been disconnected.
If the unit has been running, use caution around the condenser and copper tubing. These areas may be very•
hot.
Use caution around the condenser fins and baseplate edges. These areas are sharp.•
Refrigerant is under high pressure. Always evacuate any system before attempting to open it.•
Reasonable care and safe work methods should be practiced when working on any Marvel product. Never•
work with energized electrical equipment in wet or damp areas.
Use an appropriate work area and location when performing repairs. You will find that it is easier to repair•
undercounter units if they are set on a raised platform or workbench.
Always wear protective safety glasses and gloves when working on any Marvel product.•
Any refrigerant, whether CFC, HCFC, or HFC (R-12, R-22, or R-134a), must be recovered. Federal regulations•
prohibit the intentional venting or release of refrigerants during the service repair or disposal of an appliance.
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MICROSENTRY™ REFRIGERATION MONITOR
1.4 Basic Refrigeration Tools
The following list contains some of the tools required for basic refrigeration repairs:
Hoses with R-134a couplers (must meet standards for handling R-134a refrigerant)1.
Approved and certified recovery system for R-134a2.
Manifold gage set for R-134a3.
Charging cylinder with R-134a4.
Weight scale (preferably in ounces to the nearest tenth of an ounce)5.
Access valves6.
Small and large tubing cutter7.
Brazing torch8.
Swaging tools9.
Multimeter10.
Leak detection equipment for detection of R-134a11.
Standard hand tools (assorted Phillips and standard screwdrivers, sockets, allen wrenches, adjustable wrenches,12.
etc.)
Rivet gun and assorted rivets13.
Drill motor and assorted metal drills14.
1.5 Installation
Unit can be installed freestanding or built-in. The front of the unit must be unobstructed for proper air circula-•
tion and operation at all times.
Area should be ventilated and without extreme temperatures.•
Unit must be installed indoors and away from the elements of nature. The unit is not U.L. approved for outdoor•
use and doing so may void any warranties.
Unit must be on a LEVEL surface capable of supporting the loaded weight of the unit.•
1.6 Electrical Requirements
WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow these requirements could result in personal injury, electrical shock, or fire.
115 VAC, 60 Hz., single phase power is needed•
Use an outlet with a 15 amp delayed action fuse or circuit breaker. DO NOT PUT A FUSE ON THE NEUTRAL•
OR GROUND OF THE CIRCUIT.
Properly grounded outlet is required for this unit.•
It is recommended that a single circuit receptacle be used for this unit only. DO NOT USE AN EXTENSION•
CORD.
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MICROSENTRY™ REFRIGERATION MONITOR
Section 2: Sealed System
2.1 Introduction
The following should always be practiced with any sealed system that has been opened. ONLY OPEN THE SEALED
SYSTEM AS A LAST RESORT AND AS A FINAL DIAGNOSIS. Always check other areas of operation such as wiring,
airflow, thermostat, etc. before opening up the sealed system. Many times these areas can resemble sealed system
problems. The diagnosis of a sealed system can be determined by accurate pressure and temperature measure-
ments. Also, checking the evaporator frost pattern is a great way to tell if a charge is adequate within a system.
Use a leak detection system that will detect R-134a refrigerant. Leaks need to be found on any leaking system1.
BEFORE the repair takes place.
The drier must be replaced anytime the sealed system is opened. Always use a MARVEL drier. Failure to do so2.
may cause repeated system failure in the future.
Limit time the system is opened. DO NOT EXPOSE THE OPEN SYSTEM FOR MORE THAN 15 MINUTES. This3.
will result in sealed system failure. Leave replacement parts sealed and/or pressurized until ready to install.
The compressor must be replaced if there is a low side leak. Moisture has been drawn into the system if the4.
unit has been running for an extended period of time. Be sure to flush the system with dry nitrogen gas and
evacuate to 50 microns before re-charging (see Section 2.2, Low Side Leaks).
A new evaporator assembly must be ordered if the capillary tube is found to be plugged or severely restricted.5.
Restrictions cannot be flushed out.
Be sure to purge the system after final brazing. This will flush out any air or moisture that may have entered the6.
system before being absorbed into the ester oil.
2.2 Low Side leaks
Low side leaks consist of a break in the system at the evaporator, low side (suction) return line, or accumulator. If a
leak is found in any of these areas, moisture has probably entered the system. The compressor and drier will have
to be replaced and the system will need to be flushed thoroughly with nitrogen gas and evacuated to 50 microns
before re-charging.
2.3 High Side Leaks
High side leaks consist of a break in the system at the condenser, high side tubing, drier, or capillary tube. If a
leak is found in any of these areas, the system can be flushed with nitrogen gas, evacuated to 50 microns, and re-
charged.
2.4 Restricted Capillary Tube
Moisture or other contaminants that enter the system can cause deposits in the system. These deposits will usually
collect in the capillary tube and form a restriction that cannot be completely removed by flushing. If the capillary
tube is found to be restricted, the evaporator, compressor, condenser, and drier should all be replaced.
2.5 Access Valves
A temporary access valve can be used to service or evaluate the system. From these access valves, you can evacu-
ate, charge, and recover the system. The access valve can be installed on the compressor’s process tube (this will
also be a low pressure side). Be sure to cap off access valve while servicing. This will prevent contamination of
the sytem and/or refrigerant from leaking. After servicing, the access valve should be removed. A pinch-off tool
can be used to close the system to remove the access valve and then braze the hole for the access valve to seal the
system. Be sure to leak check after brazing. 3

MICROSENTRY™ REFRIGERATION MONITOR
2.6 Evaporator Frost Pattern
Checking the evaporator frost pattern is a good way to quickly diagnose simple sealed system problems. This can
be done by allowing the unit to run (at least 10 minutes) with the door open for at least 5 minutes. This will help
speed up the normal frosting of the evaporator plate. By visually inspecting the evaporator and feeling it with your
hands, you will see and feel frost across the plate. It is absolutely necessary for the frost to cover the entire evapo-
rator plate. This will ensure the system has been charged to its specified amount or does not have a leak. A partial
frost pattern may lead to excessive run times or even 100% run mode. This is because the frost does not reach the
area of the evaporator thermistor thus it does not sense the temperature required to cycle the unit off.
2.7 Pressure and Temperature
There are a couple of ways to measure temperature of the evaporator plate:
Use a thermocouple to measure the temperature of the evaporator plate. The thermocouple must be secured1.
to the evaporator when taking the measurement.
If it has been determined that there is proper contact between the sensor and evaporator plate, the sensor resis-2.
tance value can be corresponded to the temperature (see Table C in Section 4.2, Sensors for values).
NOTE: The temperature and pressure reading must be taken while the unit is on and running. Use gage pressure
readings from the compressor’s process tube (low side) access valve.
Table B: Refrigeration Temperature-Pressure Chart for R-134a
Degrees F Pressure (psi) R-134a Degrees F Pressure (psi) R-134a
-12 1.1 36 31.3
-8 2.8 38 33.2
-4 4.5 40 35.1
0 6.5 42 37.0
2 7.5 44 39.1
4 8.5 46 41.1
6 9.6 48 43.3
8 10.8 50 45.5
10 12.0 52 47.7
12 13.1 56 52.3
14 14.4 60 57.5
16 15.7 64 62.7
18 17.0 68 68.3
20 18.4 72 74.2
22 19.9 76 80.3
24 21.4 80 86.8
26 22.9 84 93.6
28 24.5 88 100.7
30 26.1 92 108.2
32 27.8 96 116.1
34 29.5 100 124.3
Pressure will vary depending upon the ambient temperature and current stage of operation for the unit. For ex-
ample, the unit will have pressure between 0 and 5 psi just before entering the off cycle. Normal running pressures
on the low side will average 5 to 10 lbs.
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MICROSENTRY™ REFRIGERATION MONITOR
If low side pressure is below pressure in Table B, check for the following:
A system leak1.
Capillary tube is restricted2.
Insufficient compressor (does not pump properly)3.
If low side pressure is above pressure in Table B, check for the following:
Restricted air flow1.
Dirty condenser coil2.
Overcharged system3.
Low side leak4.
2.8 Re-charging
Re-charging of the unit should be done only after diagnosing and repairing the system. Be sure to flush the system
with dry nitrogen gas and evacuate to 50 microns before re-charging.
The method for re-charging the unit is by weight using vapor refrigerant. Using manifold gage set-up, hook up
charge hoses to the access valve on the compressor’s process tube. If any access valve is attached to the high side
process tube, remove it and then seal the tube by brazing before charging. Charge the unit to specified amount
(see Section 1.1, Unit Specifications for charge specifications per model).
After re-charging the system, check pressures and refer to Table B for corresponding temperatures and pressures.
If pressures are incorrect, check the sealed system, recover the charge, repair, evacuate, and then re-charge.
It is normal to have some condensation or slight frost on the suction line. Typically this will occur towards the end of
a run cycle. If the frost continues down the suction line to the compressor, the system is overcharged. It is impor-
tant that the insulation remains on the suction line and the capillary tube together after any repair and that it is
sealed on both ends. Be sure to replace the refrigeration putty in the hole of the foam where the refrigerant lines
go through the back of the unit. Spread the putty out evenly filling in the cracks to prevent air from leaking in and
out.
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MICROSENTRY™ REFRIGERATION MONITOR
Section 3: Sealed System Components
3.1 Gaining Access to Mechanical Baseplate
The mechanical baseplate is located in the rear of the unit. Most major mechanical and electrical components on
the unit mount directly to the baseplate. This creates easy access for servicing of the sealed system and mechani-
cal/electrical components. To gain access to the mechanical baseplate, remove the screws that hold the lower
shroud in place and then remove the shroud (see Figure 3.1). To facilitate working on any component mounted
to the mechanical base, remove the screws that hold the baseplate to the chair frame and slide out the baseplate
enough to allow working room required (see Figures 3.2 and 3.3).
Figure 3.1
Remove screws.
Figure 3.2
Remove screws securing the
mechanical baseplate.
Figure 3.3
Slide out the mechanical
baseplate.
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MICROSENTRY™ REFRIGERATION MONITOR
3.2 Compressor
The compressor is the heart of the refrigeration system (see Figure 3.4). However, it relies on other parts of the
system to function. Make certain that the other parts of the system are functioning correctly before determining that
the compressor is faulty.
Figure 3.4
Compressor
Drier
The following should be observed before concluding the compressor is faulty:
Low high side pressures, warm evaporator plate, cool condenser coil, or little or very low current draw from the1.
unit will indicate a faulty compressor.
Check for continuity between the compressor terminals and the shell of the compressor. If continuity is found,2.
the compressor is faulty and will need to be replaced.
Check for resistance between all compressor terminals. The resistance will vary from terminal to terminal and3.
from compressor to compressor due to age and use. If no resistance is found, the compressor is faulty and will
need to be replaced.
Removing the Compressor:
Disconnect power to the unit.1.
Remove the back panel and lower shroud (see Figure 3.1).2.
Remove the screws that hold the baseplate to the chair frame of the unit and slide out the mechanical baseplate3.
(see Figures 3.2 and 3.3).
Install sealed system access valve(s) and recover refrigerant. After recovering, be sure to cap off the access4.
valve(s) to prevent contamination of the system.
Remove the cap from the rear of the compressor to expose the starter and overload (see Figures 3.5 and 3.6).5.
Disconnect the PTC starter and overload from the compressor by pulling off. Disconnect the wires from the6.
starter and overload.
Un-braze and remove capillary tube from drier assembly (see Figure 3.4).7.
Un-braze and remove suction line at compressor (see Figure 3.7).8.
Un-braze high side line from the compressor going to the condenser (see Figure 3.7).9.
Remove compressor by removing the three lock nuts on the mounting plate of the compressor (see Figure 3.7).10.
Lift the compressor off of the carriage bolts.
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MICROSENTRY™ REFRIGERATION MONITOR
Installing the Compressor:
Install the four rubber grommets in the bottom of the new compressor and install the three sleeves where the1.
carriage bolts will be located. Mount the new compressor and install the three washers and lock nuts and
tighten to 45 in-lbs. DO NOT REMOVE THE RUBBER PLUGS AT THE TUBE STUBS ON THE COMPRESSOR AT
THIS TIME.
Install and braze new drier assembly to condenser. Then install and braze capillary tube to drier. Remove the2.
plug for the high side line to condenser. Install and braze the line to the compressor.
Remove the plug for the process tube on the compressor. Install and braze process tube. Be sure to cap off3.
end to prevent any contamination.
Remove the plug for the suction line on the compressor. Install and braze the suction line from the evaporator.4.
BE SURE TO ALSO REINSTALL THE SUCTION LINE AND TUBING HARNESS INSULATION TUBES.
Reinstall the PTC starter and overload and wire according to the wiring diagram (see Section 7, Wiring).5.
Reinstall the compressor cap.6.
Reinstall the screws that secure the baseplate to the chair frame of the unit. Be sure to fasten down the ground7.
wire to the baseplate.
Charge the unit (see Section 2.8, Re-charging).8.
Reinstall back panel and lower shroud to complete installation.9.
Figure 3.5 Figure 3.6
Figure 3.7
Process tube
High side tubing going to
the condenser.
Suction line tubing going to
the evaporator.
Compressor lock-nut
8

MICROSENTRY™ REFRIGERATION MONITOR
3.3 Condenser
The condenser is a steel tube serpentine with copper alloy fins that removes heat from hot, high pressure vapor
from the compressor (see Figure 3.8). The most common trouble is lack of airflow from either a restricted intake or
exhaust opening in the front of the unit. Lint, dust, hair, and dirt build-up needs to be removed from the condenser
periodically to allow the unit to perform properly.
Figure 3.8
It is possible that the condenser might need replaced because of an unrepairable leak or a restriction that cannot
be flushed out. System high side pressures and temperatures will verify if this is the case.
Removing the Condenser:
Disconnect power to the unit.1.
Remove back panel and lower shroud (see Figure 3.1).2.
Remove the screws that hold the baseplate to the chair frame of the unit and slide out the mechanical baseplate3.
(see Figures 3.2 and 3.3).
Install sealed system access valve(s) and recover refrigerant. After recovering, be sure to cap off the access4.
valve(s) to prevent contamination of the system.
Remove the condenser fan by removing the four screws on the fan mounting bracket at the baseplate. The fan5.
wire leads can be left connected. Set the fan assembly to the side out of the mechanical.
Remove the condenser fan shroud.6.
Un-braze capillary tube from drier assembly.7.
Un-braze high side tubing from the compressor.8.
Remove the condenser and drier assembly.9.
Installing the Condenser:
Reverse the removal procedure for installation (see above). Always install a new drier after opening the sealed sys-
tem. Be sure to flush the system and evacuate to 50 microns before weight charging. If contamination was found
or determined, the evaporator should also be replaced at this time.
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MICROSENTRY™ REFRIGERATION MONITOR
3.4 Evaporator
The evaporator uses evaporating refrigerant to remove heat from the inside of the unit ultimately making the inte-
rior cold. The shape and size of the evaporator may vary among the models covered by this service manual but the
fundamentals are the same (see Figures 3.9, and 3.10). The 3SWCE and 3SBARE use a vertical right angle evapo-
rator plate. The 61WCM and 6BARM use a U-shaped plate.
It is normal for the evaporator to frost up during its run cycle. This frost will dissipate once the unit reaches its “cut
out” temperature and the compressor and fan stop. This condensate water will flow to the rear of the machine in a
condensate pan where it will be evaporated from compressor and fan heat. It is very important that the evaporator
frosts in a uniform pattern across the plate (see Section 2.6, Evaporator Frost Pattern). A partial frost pattern can
lead to excessive run times and cooling issues.
Figure 3.10:
U-shaped evaporator plate used in the 61WCM and
6BARM
Typical low charge or system leak on this evaporator
style will have a frost pattern that is only on the left
hand side of the plate, not full across the plate.
Figure 3.9:
Vertical right angle evaporator plate used in the
30WCM & 3BARM
10

MICROSENTRY™ REFRIGERATION MONITOR
Section 4: System Components
4.1 Condenser Fan
The condenser fan is used to force air over the condenser coil. The fan will cycle on and off with the compressor
which means that when the compressor is running so is the fan and when the compressor is not running neither is
the fan (see Figure 4.1).
Figure 4.1
To check the condenser fan:
Make sure the motor shaft turns freely. This can be done by rotating the fan blade by hand and observing any•
excessive resistance.
Check for resistance between terminals. If no resistance is found, replace the condenser fan.•
Check for continuity between terminals and fan casing. If continuity is found, replace the condenser fan.•
Check current draw. Typical current draw will be 0.15 amp without fan resistance. If current draw is 0.19 amp•
or more, check for resistance in air movement or objects touching the fan blade. If this is not found, replace
the condenser fan.
Removing the Condenser Fan:
Disconnect power to the unit.1.
Remove access panel and rear panel.2.
Remove the grille by removing the screws and disconnecting the wires to the rocker switch. Be sure to mark3.
where these wires go for reassembly.
Remove the screws that secure the baseplate to the cabinet on the bottom of the unit.4.
Gently slide the mechanical out the back of the unit to gain access to the condenser fan.5.
Disconnect the neutral white wire lead (black ribbed wire) and hot wire lead (black smooth wire) from the wire6.
harness.
Remove the condenser fan.7.
Installing the Condenser Fan:
Reverse the removal procedure for installation (see above).
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MICROSENTRY™ REFRIGERATION MONITOR
4.2 Sensors
The wine cellars and beverage centers utilize one (1) sensor, known as the control sensor. The control sensor (part
number 41050117) senses the interior temperature allowing the control to adjust and properly display the interior
temperature.
The following will happen in the event the sensor fails:
The display panel will flash “E1” for a sensor fault, indicating a problem with the sensor.1.
The sensor can be checked by use of a multimeter with the ability to read resistance. To check the sensor:
Disconnect and remove sensor from unit.1.
Use a reference temperature point that is know (such as an ice bath) and measure the resistance across the2.
wire leads.
Compare the recorded resistance with Table C.3.
If measured resistance falls outside the resistance given in Table C within 4% of the value, the sensor is bad and will
need to be replaced.
Table C: Resistance versus Temperature Chart
Temperature (C) Temperature (F) Resistance (K-OHMS)
-40 -40 19.565
-35 -31 14.817
-30 -22 11.335
-25 -13 8.756
-20 -4 6.824
-15 5 5.365
-10 14 4.251
-5 23 3.389
0 32 2.722
5 41 2.202
10 50 1.793
15 59 1.467
20 68 1.208
25 77 1.000
30 86 .8315
35 95 .6948
40 104 .5834
45 113 .4917
50 122 .4161
If the sensor has been tested and is found to be good, check the temperature of the evaporator plate and the resis-
tance of the sensor. If the temperature of the evaporator plate does not correspond to a proper resistance from the
sensor, check for a proper and secure connection of the sensor to the evaporator plate bracket.
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MICROSENTRY™ REFRIGERATION MONITOR
Removing the Sensor:
Disconnect power to the unit.1.
Loosen the screws to the display housing and pull it forward. It will hang down in front of the unit.2.
Open the wire conduit.3.
Loosen the “p” clamp that holds the sensor to the wall.4.
Unhook the sensor at the electronic controller. The controller is found in the display housing.5.
Pull the sensor out of the unit.6.
Installing the Sensor:
Reverse the removal procedure for installation (see above).
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MICROSENTRY™ REFRIGERATION MONITOR
Section 5: MicroSentry™ Refrigeration Monitor and User Panel
5.1 Introduction
Marvel’s MicroSentry™ refrigeration monitor oversees the refrigeration system’s performance to help maintain a
selected temperature. An audible alarm is sounded if the temperature goes 10 degrees F above or below the set
point for more than one hour or if the door is left ajar for more than five minutes. A discreet amber LED display
shows cabinet temperature. The digital touch controls are easy to set for a temperature of 40 to 65 degrees F. See
Figure 5.1 below for an example user panel.
14
Figure 5.1
Door Switch
Light Switch
Control
5.2 Starting the Unit
To start the unit, plug it into a power supply. The unit should start automatically as the factory default should be on.
If the unit does not start, push and hold for three (3) seconds the “ON/OFF” button located on the display panel.
5.3 Adjusting the Temperature Control
The temperature control is fully adjustable from the low 40s to the mid 60s in the wine cellars and beverage cen-
ters. The setpoint out of the factory is approximately 55 degrees F. The temperature range, whether it be for wine
cellars or beverage centers, allows flexibility of temperature preferences and provides the ideal wine aging or food
storing temperatures. The temperature can be lowered or raised by pressing and holding the “SET” button on the
display panel until the set point temperature is displayed. While continuing to hold the “SET” key, push either the
“WARMER” or “COLDER” key to raise or lower the set temperature by one (1) degree F. NOTE: As with any refrig-
eration product, there is a slight temperature variance at different locations within the cabinet.
5.4 Interior Light and Switch
The light will automatically turn on when the door is opened and off when the door is closed. To engage the
display light feature, press the round light switch on the user panel. The display light will remain on regardless of
door position until the light switch is turned off.
5.5 Information/Lockout Key
Each momentary press of the “SET” key activates the Information and Lockout selection menu. Additional presses
sequentially scroll through the Information selection menu and allow the enabling and disabling of the Lockout
feature.
Display “Current” Sensor Temperature (tl): Press and hold the “SET” key to display the current sensor temp.1.
Maximum Stored Temperature (thL): Press and hold the “SET” key to display the maximum temperature stored.2.
The data can be cleared by pressing the “SET” and “ON/OFF” keys simultaneously while the value is displayed.
Minimum Stored Temperature (tLo): Press and hold the “SET” key to display the minimum temperature stored.3.
The date can be cleared by pressing the “SET” and “ON/OFF” keys simultaneously while the value is displayed.
Total Operating Time of the Condenser Since the Last Cleaning (cnd): Press and hold the “SET” key to display4.
F
Alarm
Press and Hold Press and Hold
Set Colder Warmer ON/OFF

MICROSENTRY™ REFRIGERATION MONITOR
the total operating hours of the compressor since the last cleaning. This number is displayed in weeks. A
reminder is displayed when a cleaning is recommended (see Alarm/Error Codes). The data can be cleared by
pressing the “SET” and “ON/OFF” keys simultaneously while the value is displayed.
5. Keypad Lockout Feature (Loc): This feature is useful in preventing changes in the temperature set point or
accidentally turning the unit off. Press and hold the “SET” key to display the current “Loc” setting. If “No” is
displayed, Lockout is OFF and all keys are enabled. If “Yes” is displayed, Lockout is ON and the “ON/OFF”,
“WARMER”, and “COLDER” keys are disabled. However, the key tones remain enabled. While holding the
“SET” key, press the “WARMER” or “COLDER” key to select the desired state. Release the “SET” key to confirm
the selection. NOTE: The Information/Lockout Key, “SET”, remains enabled regardless of the “Loc” setting.
5.6 Warning Alarms
The MicroSentry™ refrigeration monitor will inform you if the unit is not functioning properly. It provides both
visual and audible alerts if the door is left ajar or the temperature rises above or falls below the set temperature.
Door Ajar: If the door is left open for more than five (5) minutes, an audible alarm will sound in one (1) sec-•
ond intervals and the LED light will be a steady amber color. This will stop as soon as the door is closed.
High and Low Temperature: If the unit reaches a temperature either 10 degrees F above or below the set point•
temperature for more than one (1) hour, an audible alarm will sound in one (1) second intervals and the LED
will be a steady amber color. This will continue until the condition is corrected. NOTE: The alarm may occur
during initial start-up, when changing set-points in excess of 10 degrees F, and/or high usage which is normal.
5.7 Audible Alarm Mute
Press any key to mute the audible portion of an alarm condition. Alarm sound is only muted, not disabled. If the
condition(s) that caused the alarm(s) continue, visual indication will continue and alarm sound will periodically con-
tinue for 20 seconds every 60 minutes.
5.8 Error Code Detection
The microprocessor in the control continually monitors critical refrigeration system components for proper opera-
tion. If component parameters exceed normal operating specifications, an audible alarm will sound six times every
minute and the display will automatically flash the respective error code. If multiple errors are noted with the unit,
the error codes will be displayed sequentially. See Table D: Error Code Detection Reference for respective error
codes descriptions and the potential solutions.
Table D: Error Code Detection Reference
Error Code Error Code Description Possible Solution / Comment
do Door Ajar Close the door.
hi High Temp
The temperature of the unit exceeded the set point by 10 degrees
F for more than one hour. The error code and alarm will remain
active until the condition is corrected.
Lo Low Temp
The temperature of the unit fell 10 degrees F below the set point
for more than one hour. The error code and alarm will remain
active until the condition is corrected.
E1 Sensor Fault The monitor detected a sensor fault. Call Marvel Customer Ser-
vice or your dealer if this code is displayed.
cL Condenser Needs Cleaning Vacuum the condenser.
NOTE: The alarm and error code will remain active until the condition is corrected. The display will continue to
flash even after alarm correction until manually acknowledged by pressing any key.
15

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Section 6: Interior Components
6.1 Lights
The wine cellars and beverage centers are equipped with one (1) light, which is located behind the display housing
on the inside top of the cabinet.
Replacing the Light Bulb:
Disconnect power to the unit.1.
Unscrew the old light bulb located behind the display housing at the top of the unit.2.
Set the old light bulb aside.3.
Screw the new light bulb into place.4.
Reconnect power to the unit.5.
Check to see if the light bulb operates properly to complete installation.6.
6.2 Racks
The units utilize peg supports to hold the sliding racks. The sliding racks can be removed from the unit without
removing the support pegs. To remove the sliding racks, line up the support pegs with the notches in the retainer
wire. Then lift the racks up over the pegs and remove.
The fixed top rack can be removed from the unit by removing the four (4) screws holding the rack in place.
The glass shelves can be removed by simply pulling the shelves forward out of the unit.
DO NOT LEAN ON OR PRESS DOWN HEAVILY ON THE WINE SHELVES. Doing so may damage the shelves•
and the wine bottles stored on them.
Pull the wine racks out gently and carefully to minimize unsettling of the wine collection.•
Avoid pulling out more than one rack at any time to maintain stability.•

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Section 7: Wiring
Figure 7.1: Wiring Diagram for 30WCM, 61WCM, 3BARM & 6BARM

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Section 8: Ordering Parts
The following information will need to be given when inquiring about service parts:
Model and serial number located on the serial nameplate (see Section 1.2, Serial Nameplate)1.
Color of the model2.
Metal or plastic grille3.
Type of door4.
To order parts, call or write:
Northland-Marvel
P.O. Box 400
1260 E. Van Deinse St.
Greenville MI 48838
Phone: [phone]
Website: www.marvelrefrigeration.com