Hussmann LBN Quick guide

January 2006
HUSSMANN - GLOVERSVILLE
INSTALLATION & SERVICE
INSTRUCTIONS
FOR
LBN MODELS
Low Temperature – Self Contained Merchandiser
For
Pre-Packaged Ice Cream, Ice Cream Novelties and Frozen Foods
P/N OII – LBN
January 2006
First Call for help (US and Canada):
1-800-922-1919
Soporte Tècnico y Asistencia (Mèxico):
01-800-522-1900
For a Service Network Locator and other
Information visit us at
www.hussmann.com
select Worldwide Locations

TABLE OF CONTENTS
Page
Location – Clearance
Initial Set-Up
Skid 4
Leveling – Sealing 5
Access Panel Removal 5
Compressor 5
Electrical Connections 5
Serial Plate Information 6
Start – Up and Loading 6
BTU’s – Electrical – Dimensions 7
General Upkeep and Cleaning 8
Routine Maintenance 8
Operation and Maintenance
Power Switch 10
Temperature Control 10
Thermometer 10
Electrical Box 10
Defrost Time Clock 11
Defrost Thermostat 11
Defrost Heater Replacement 12
Lighting 13
Condensate Heaters 13
End Panel Heaters 13
Front Glass Heater and Replacement Procedure 14
Nose Heater 14
Condensate Heater Limit Thermostat 14
Refrigeration 15
Leak Testing 15
Evacuation 15
Operational Data 16
Refrigerant Control 16
Crankcase Pressure Regulator 16
Trouble Shooting 18
Light Problems and Solutions 20
2

TABLE OF CONTENTS
Con’t
Page
Accessories & Options
Countertop 21
Stainless Steel Top 21
Superstructure w/Lighted Canopy 21
Superstructure w/o Lighted Canopy 21
Product Shelf Kit 21
Bag Rack 21
Dial Thermometer 22
Lid Lock Kit 22
Caster Kit 22
Novelty Basket 22
Warranty
Ordering Replacement Parts 22
Warranty Parts Procedure 22
Compressor Replacement Procedure 23
Internal Leak Warranty Policy 23
Electrical Components Replacement List 25
3

The LBN series are low temperature, self-contained cabinets designed for
pre-packaged ice cream, ice cream novelties, and frozen food at below freezing
temperatures. Design features include non-heated glass lids; efficient foamed
in place non-CFC insulation, interior mirror reflectors, front-air discharge
condensing unit, (except LBN-10) and a balanced refrigeration system for
energy saving performance.
There are also a number of options available for the LBN series. See
ACCESSORIES & OPTIONS section in back of this booklet.
LOCATION – CLEARANCE
AND
INITIAL SET-UP and START-UP
AND
BTU’S – ELECTRICAL – DIMENSIONS
The LBN-10 must also maintain a
two- (2) inch clearance at the rear
of the cabinet because, unlike the
other LBN models, it is not front
air discharge.
Upon receipt of the cabinet,
carefully examine the crating for
damage. If crate is damaged, make
a note on the delivery ticket before
signing. Carefully remove shipping
crate and examine the cabinet for
“concealed” damage. If damage is
found, contact the delivering
carrier immediately and have his
agent prepare an inspection report
for the purpose of filing a claim.
THIS IS YOUR RESPONSIBLILTY.
INITIAL SET-UP
SKID –
The skid should be left on the
cabinet until it is near its final
location. The skid provides
protection for both cabinet and
floor. The skid is removed by
removing the bolts holding the
cabinet to the base, then sliding
the cabinet off the skid. A “mule”
bracket is built in the end of the
cabinet base frame for this
purpose.
LOCATION
Avoid locating the cabinet where
direct sunlight would shine into the
fixture or where drafts from air
conditioning grills, fans, and open
doors could effect it operation.
Because the condensing unit is
located at the bottom of the
cabinet, a two (2) foot clearance
should be allowed in front of the
louvered access panel to provide
free air movement to and from the
condenser for maximum operating
efficiency.
4

LEVELING - SEALING
Proper drainage of the evaporator
condensate water requires the
cabinet to be properly leveled. This
means left to right as well as front
to back.
Shimming under the cabinet base
frame may level the cabinet. A
slight pitch from front to back is
desirable. The cabinet back should
never be higher than the front.
Once level the cabinet should be
approved material such as General
Electric RTV-102 silicone sealer or
an equivalent.
ACCESS PANEL REMOVAL
The louvered panel on the lower
right front of the cabinet provides
access to the condensing unit and
electrical box.
There is also a back panel that
covers the rear of the condensing
unit compartment that can be
removed to again access to the back
of the compartment. The drain
trap should be filled with water.
This prevents warm air from
migrating back through the drain
to the evaporator coil. Failure to
fill the trap with water, could
result in excessive frosting of the
evaporator coil.
Access to the trap is achieved by
removing the back panel that
covers the rear of the compressor
compartment .
On the LBN-10 this back panel is
a wire grill that allows the
discharge air to flow through the
condensing unit compartment.
Before removing this panel, make
sure the power supply to cabinet is
disconnected.
Silicone Sealant
Floor
COMPRESSOR
The compressor is banded for
shipping. Remove the two bolts
holding the compressor bar in
place, then you can pull out the
condensing unit.
Cut the steel band, which holds
down the compressor during
shipping. The compressor should
now float freely on the mounting
springs. DO NOT LOOSEN NUTS.
ELECTRICAL CONNECTIONS
The LBN-4, 5, 6, 7 and 8 models
have a power cord attached to the
unit with a ground prong. Do not
remove the grounding prong under
any circumstances. The cord is
rated 115v/15 amp. The LBN-7,
5

and –8 also require a circuit
breaker or a time delay fuse rated
at 15 amps for the circuit being run
to them.
NOTE: Connecting this unit to
any electrical supply other than
specified on the serial plate will
void the warranty and may result
in serious damage to the unit. The
cabinet should be supplied with its
OWN service.
The LBN-10 requires conduit
connections of both 115v and 208-
230v with an amperage rating of 15
amps for each circuit. Marked
leads are provided for these
connections in the field.
SERIAL PLATE INFO.
The serial plate is located on the
left-hand end of the case interior,
If wiring the LBN-10 to a “3-wire”
system is preferred, a 20amp, 208-
230 v circuit needs to be provided. and a second one in the condensing
unit compartment. It has all the
pertinent information needed for
proper electrical installation. The
serial plate should not be removed
for any reason.
See the diagram below concerning
a “3-wire” system.
INITIAL START UP AND
LOADING
♦Set the defrost timer for the
correct time of day, making sure
the defrost pins are secure in
the face of the clock. The LBN-
4 through –8 models are
factory set for one (1) defrost
period in 48 hrs. @ 12 a.m. and
LBN-10 is factory set for one (1)
defrost period in 24 hrs. @ 12
a.m.
All of these models are 60hz, 1ph.
If another voltage, hertz, or phase
is required, please consult the
factory.
♦Check the cabinet thoroughly
for loose nuts and bolts and
electrical connections. Inspect
the refrigeration lines for any
visible damage or chafing.
IT IS VERY IMPORTANT TO
YOU AND YOUR CUSTOMERS
TO HAVE THE CABINET
PROPERLY GROUNDED. A
qualified electrician in accordance
with the National Electrical Code
and/or local codes should do the
electrical installation.
♦Replace the louvered access
panel.
6

♦Start the cabinet and allow to
pull down to operating
temperature before loading.
BTU CAPACITIES
RATINT TEMPS oF
BTU/HR EVAP COND AMB
LBN-4 2380 -25 110 90
LBN-5 2830 -25 110 90
LBN-6 3325 -25 110 90
LBN-7 3990 -25 110 90
LBN-8 4600 -25 110 90
LBN-10 5410 -25 110 90
ELECTRICAL
UNIT RUN FUSE SHIP
H.P. HZ/PH VOLTS AMPS SIZE WT.
LBN-4 ½ 60/1 115* 10.2 15 515
LBN-5 ½ 60/1 115* 10.2 15 585
LBN-6 ½ 60/1 115* 10.2 15 663
LBN-7 ¾ 60/1 115* 11/5 11+ 745
LBN-8 ¾ 60/1 115* 12.0 15+ 815
LBN-10 1 60/1 115 2.7 15 967
208-230 7.0 15
* 115V/15amp grounded power cord included
+ 15 amp time delay fuse or circuit breaker required
DIMENSIONS
Cu. Exterior Interior
Ft.
Cap. L W H L H W
LBN-4 9.5 48 1.2 31 ½ 39 ¾ 44 ¼ 21 26
LBN-5 13.2 60 31 ½ 39 ¾ 55 7/8 21 26
LBN-6 16.8 72 31 ½ 39 ¾ 67 7/8 21 26
LBN-7 20.5 84 31 ½ 39 ¾ 79 7/8 21 26
LBN-8 24.9 95 5/8 31 ½ 39 ¾ 91 ½ 21 26
LBN-10 31.8 118 7/8 31 ½ 39 ¾ 114 ¾ 21 26
7

GENERAL UPKEEP, CLEANING
AND
ROUTINE MAINTENANCE
CARE AND CLEANING
To insure good sanitation,
appearance, and minimum
maintenance, the cabinet should be
cleaned and washed regularly as
use demands. Clean with mild
detergent and warm water. DO
NOT USE AN ABRASIVE
CLEANER OR STEEL WOOL, AS
THEY WILL MAR THE FINISH.
ROUTINE MAINTENANCE
♦Under normal conditions, after
the cabinet is installed and
running, very little
maintenance should be
required. However, the
following list of housekeeping
practices will assure trouble-
free operation.
♦Check operation of condenser
fan motor. Fan blade must turn
freely.
♦The condenser is of bare-tube
construction on the LBN-4
through –8 to reduce the
amount of maintenance
required, and fin-and-tube
construction on the LBN-10. To
keep the cabinet at top
efficiency, periodic cleaning is
required. To ease in the
cleaning of the bare-tube
condenser, the top of the
condenser shroud is removable.
Slit the upper corners of the
gasket on the front of the
condenser, remove the screws
holding the shroud top into the
shroud ends, and remove the
top to gain full access to the
condenser.
♦The glass lids are made of
tempered, non-heated glass.
The lids slide up to open and
can be locked open for product
loading. The lids are not self-
closing. The lids will close
easily by hand and with the
assistance of gravity. There is
a nylon glide on the edge of the
glass to assist in closing. The
lid tracks must be cleaned
periodically to allow the lids to
close freely.
♦Manually defrost cabinet as
usage dictates. The LBN series
8

are gravity-cooled cabinets. The
sidewalls have refrigeration
tubing in them to cool the lower
portion of the interior and there
is an upper evaporator that
drops cold air down onto the
product. The upper coil is
equipped with defrost heaters
that defrost the coil. THE
SIDE WALLS OF THE
CABINET WLL BUILD UP
FROST AND ICE ON THEM
OVER TIME AND DO NEED
TO BE MANUALLY
DEFROSTED AS USAGE
AND BUILD UP DEMANDS.
♦The interior of the cabinet has
load line markings showing how
high product can be loaded.
Loading product above these
lines is above the refrigerated
area in the case and will
adversely affect the product in
this area.
♦Clean the cabinet with mild
detergent. This will insure good
sanitation, and minimize
maintenance. Never use an
abrasive as this could mar the
finish.
9

OPERATION
AND
MAINTENANCE
POWER SWITCH
The power switch is located at the
electrical box that is behind the
front, louvered access panel. A slot
in one of the louvers allows access
to the switch. The switch will shut
off all power to the cabinet on the
LBN-4 through –8 and shut off the
208-230 circuit on the LBN-10.
TEMPERATURE CONTROL
♦The temperature control is
located between the electrical
box and condenser behind the
bottom louvered access panel.
The temperature control does
not have an “OFF” position.
Turn the adjustment knob on
the face of the control to make
adjustments. Turning it
clockwise will give colder
temperatures while counter-
clockwise will give warmer
temperatures. It is not good
practice to operate the case with
the temperature control at the
coldest position, as it will
shorten compressor life.
♦The control is factory set for
approximately –15oF. The
temperature should be checked
with a thermometer other than
the cabinet thermometer after it
is running to insure that the
cabinet is running at the proper
temperature for the product.
Ice cream should be kept at –
10oF to –15oF. Frozen food
should be kept at 0F to –5oF.
♦If it should become necessary to
replace the temperature control,
the sensing control capillary
will need to be pulled out of the
control well. When doing this,
mark the length of capillary
pulled out of the control well so
that the same amount can be
replaced (approx. 19 – 19 ½”),
otherwise the temperature
control will not react properly
and cabinet temperature will be
adversely affected.
THERMOMETER
The cabinet has a thermometer
located on the left-hand end of the
nose screen that is just below the
upper mirror reflector and light
fixture. The thermometer is a
“pencil” type and reads from –40oF
to +80oF on 2oincrements. To
replace, remove the two screws and
install the replacement.
ELECTRICAL BOX
The electrical box contains the
defrost time clock, terminal boards,
and power switch. The box is
capable of sliding out for servicing
convenience and access is gained
by removing the cover. THE
CABINET SUPPLY BREAKERS
10

SHOULD BE DISCONNECTED
BEFORE REMOVING THE
ENCLOSURE COVER. ♦The defrost pins should be
checked for tightness. The
timer will require re-adjusting
after a power failure or the
cabinet supply is turned off for
extended periods of time. If an
additional defrost is required
due to ambient or cabinet usage
conditions, do not put a
defrost during the middle of
the day. Put any additional
defrosts during the night or at a
time when the cabinet has the
lowest usage.
DEFROST TIME CLOCK
♦The timer is factory pre-set for
one (1) defrost cycle per 48
hours on the LBN-4 through –8
and for one (1) defrost cycle per
24 hours on the LBN-10 at
12:00 a.m. with a 40 minute
failsafe.
♦The timer must be adjusted to
the proper time of day when the
cabinet is started. The timer is
adjusted by turning the knurled
adjustment knob in the center
of the dial face counter-
clockwise until the time
indicator corresponds with the
correct time of day.
♦Defrost is time initiated and
temperature terminated.
♦If the thermostat should fail,
the timer is equipped with a
failsafe set at 40 minutes that
will allow defrost to terminate
on time.
DEFROST THERMOSTAT
♦The defrost thermostat is
located on its mounting plate
which is located on the right
hand end of the evaporator coil
attached to the air scoop which
is a right angle piece of metal
running in front of the
evaporator behind the nose
screen. The thermostat is a bi-
metal thermostat that is tied in
series with the defrost time
clock solenoid to end defrost
when the temperature has been
satisfied which is 85oF.
11

♦To remove the thermostat if it
needs replacing, disconnect
power. Remove the nose screen
from in front of the evaporator.
♦Remove the stainless steel
reflector. Remove the nose
screen in front of the evaporator
area.
♦Remove the stainless steel
mirror reflector over the light
fixture.
♦The heaters are held up against
the evaporator by spring clips.
♦Consult the wiring diagram for
the wiring terminations for the
thermostat and disconnect. ♦Press the heaters down and pull
up on the front edge of the
heater clips. The heaters can be
pulled forward.
♦Remove the air scoop which is
in front of the evaporator coil
and has the defrost Thermostat
mounting plate attached to it.
Remove the thermostat and
disconnect wires.
♦When replacing be sure the
back pass of the rear defrost
heater goes into the retaining
clip at the back of the drain
pan. This is necessary to
prevent ice build up in the drain
pan.
♦Reverse the procedure to
reinstall the new thermostat.
DEFROST HEATER
REPLACEMENT
♦The cabinet is equipped with
two (2) defrost heaters which
are wired in parallel, except for
the LBN-4 through –8, 220 volt
which are wired in series.
Wiring them this way allows for
lower wattage which increases
the life of the heater. The
drain pan does not have to
be removed to replace the
heaters.
♦The heaters are equipped with
plug-in connections that plug
into the underside of the light
fixture. Disconnect the power
supply
12

CONDENSATE HEATERS
LIGHTING
There are condensate heaters
behind the stainless steel end
panels, around the front glass, and
behind the nose screen. These
heaters are thermostatically
controlled in case the cabinet
malfunctions and the thermostat
senses above 101oF at which time
the heaters will shut off. At
normal ambients and cabinet
operation the heaters will remain
on.
♦Cool white fluorescent bulbs
located on the underside of the
stainless steel mirror reflector
provide interior lighting. The
bulbs are sleeved to maintain
proper heat around the bulb for
maximum light intensity and to
protect the product in case of
breakage.
♦The tubes can be replaced
without removing the doors. To
replace, twist the bulb and slide
the prongs clear of the
lampholder. When reinstalling
this type of bulb be sure the
prongs on the bulb twist and
lock into place.
END PANEL HEATERS
The end panel heaters are located
behind the end panel stainless
steel reflectors. They can be
removed by removing the screws on
the bottom edge of the panel and
pulling down on the bottom edge.
♦There is a convenient ON/OFF
switch located on the right hand
end, inside the cabinet, behind
the mirror reflector. This
switch only controls the lights.
The 115-volt power must be
shut off at the main power
supply source located within the
store prior to starting any
service or maintenance work.
The lights should always be left
on to prevent moisture from
forming on the mirror reflector,
which is especially possible in
high humidity applications.
The heater is on adhesive foil on
the backside of the panel.
♦The light ballast is located in
the light fixture. To gain access
remove the mirror reflector.
13

FRONT GLASS HEATER
♦Remove the plastic arm trim
breakers in the end aluminum
trim pieces to expose the screws
in them. Remove screws and
remove end trim.
The front glass heater surrounds
the perimeter of the front glass.
The purpose of the heater is to
keep the aluminum trim
surrounding the glass free of
condensation. If the cabinet is
located in a high humidity
environment, the center of the
glass may have a trace of
condensation across it.
♦Remove the trim from the top of
the front glass.
♦Pull the front glass up and out
exposing the wires at the right
hand end of the glass and
disconnect.
TO REPLACE THE HEATER
♦Disconnect power to cabinet.
Remove the cabinet top by
removing the screws that hold it
into the back of the cabinet, and
on each end.
♦Take note of the heater layout
on the glass with reference to
where the connectors are, and
then replace heater.
♦Reverse procedure to
reassemble.
♦Lift the top off the cabinet.
♦Remove the lids. NOSE HEATER
♦Remove the screws holding the
backs of the lid tracks to the
galvanized sub-top and the
screws holding the center tracks
to the aluminum rail on top of
the front glass.
The nose heater is located behind
the nose screen that is in front of
the evaporator. Remove the nose
screen and replace heater.
CONDENSATE HEATER LIMIT
THERMOSTAT
♦The condensate heater limit
thermostat is a safety feature
that will shut off the condensate
heaters just discussed when the
thermostat senses 101oF.
♦The thermostat is located on the
defrost thermostat mounting
bracket which is on the air
scoop behind the nose screen in
front of the evaporator. To
14

replace see the procedure
described under “Defrost
Thermostat”.
LEAK TESTING
♦The test gas cylinder must be
equipped with a pressure gauge
and regulator so that system
test pressures do not exceed
maximum allowable limits. Do
not ever use anything other
than an R- 22 / Nitrogen
mixture for leaks testing.
REFRIGERATION
♦As stated previously, the LBN
series are self-contained. They
feature semi-hermetic
compressors, a bare tube, front-
air discharge condenser,
combination cold wall tubing
with upper evaporator coil, and
capillary tube.
♦Attach a refrigerant test gas
cylinder to your service
manifold and connect the
manifold to the charging port on
the liquid line valve. Charge an
R-22 / Nitrogen mixture into the
system, raising the pressure to
the unit’s nameplate for the low
side and high side pressures.
Using an electronic detector,
carefully check the entire
system for leaks. Take special
care to inspect all brazed and
flare connections.
♦The exception is the LBN-10,
which has a fin-and-tube
condenser and horizontal,
straight through air discharge.
♦If it should become necessary to
leak test the system, please
adhere to the following notice:
NOTICE:
Because of the CFC atmospheric
considerations being taken
today, we ask that leak testing
be done with refrigerant 22
mixture with nitrogen. If the
condensing unit nameplate
designates a refrigerant other
than R-22 remove all R-22 from
the immediate area to avoid
confusion after leak testing and
evacuating the unit. Recharge
the unit with proper
refrigerant.
EVACUATION
After the system is proven leak
tight, thoroughly evacuate the
system according to the following
procedure:
♦Discharge the refrigerant-
nitrogen mixture, allowing it to
blow from the system as rapidly
as possible, into an empty
cylinder. Be sure that all service
valves and solenoid valves are
open to allow all of the mixture
to be discharged.
♦Connect a deep-drain vacuum
pump to both the high and low
side of the system. Pull a
15

Because the suction line capillary
tube assembly, sometimes referred
to as heat exchanger or pullout coil,
has no moving parts, it very rarely
if ever needs servicing.
vacuum on the system to at
least 1500 microns.
♦Break the vacuum by adding
refrigerant into the system until
the pressure is above 0 PSIG.
Always charge the refrigerant
line into the system through a
new drier in the charging
manifold line. A 16 cubic inch
drier is sufficient for this
purpose.
However, should a leak occur in the
system, it is possible that dirt,
dust, or moisture may collect in the
capillary tube causing the system
to go into a vacuum. Should this
occur, it is recommended that dry
nitrogen or a dry refrigerant be
forced through the system to clear
the blockage.
♦Repeat steps 2 and 3 two more
times, the third time evacuating
the system to 500 microns.
If attempts to clear the restriction
by this method are unsuccessful,
the ENTIRE ASSEMBLY, NOT
THE CAPILLARY TUBE ONLY,
should be replaced with a new
factory ordered replacement.
OPERATIONAL DATA
The following is typical data for the
LBN series based on lab tests, and
may vary under field operating
conditions.
CRANKCASE PRESSURE
REGULATOR
Amb. Temp. 75oF
Head Press 230-250 psi ♦The LBN series employ a
crankcase pressure regulator in
the suction line and is
considered part of the heat
exchanger. The CPR is set for
10 psi. The purpose of the valve
is to maintain a low suction
pressure on start-up so that the
compressor will start properly.
Suct. Press 6-8 psi
*Discharge Temp. -25oF
*Discharge temperature is the
temperature taken off the lower
half of the nose screen.
REFRIGERANT CONTROL
Refrigerant flow to the evaporator
is controlled through the use of a
capillary tube. The capillary tube
is soldered for a specified length to
the suction line, forming one
♦On start-up, the valve will hold
the suction pressure at the
desired setting until the suction
pressure has dropped below the
setting, then the valve will
open.
integral piece to assure proper heat
exchange.
16

♦If it becomes necessary to check
or reset the setting, the cabinet
must be warm such as after a
defrost cycle or from an initial
warm cabinet condition.
♦Put a suction compound gauge
on the compressor suction valve,
start the compressor. If the
pressure needs to be reduced
turn the adjustment screw
clockwise or, counterclockwise
to raise the pressure.
♦DO NOT SET THE VALVE
BASED ON THE NAMEPLATE
AMPERAGE RATING AS THE
PRESSURE SETTING WILL
BE TOO HIGH AND THE
COMPRESSOR WILL NOT
START PROPERLY.
17

TROUBLE SHOOTING
SYMPTON
PROBABLE CAUSE (S) POSSIBLE SOLUTION
Compressor runs
continuously product too
warm
1. Short of refrigerant 1. Leak check, change
drier, evacuate, and
recharge
2. Inefficient compressor 2. Replace
3. Dirty condenser 3. Clean
4. Evaporator oil logged 4. Blow oil out of
evaporator
High Head Pressure 1. Cabinet location too
warm
1. Relocate cabinet
2. Restricted condenser
air flow
2. Clean condenser to
remove air flow
restriction
3. Defective condenser
fan motor
3. Replace
4. Air or non-
condensable gases in
system
4. Leak check, change
drier, evacuate, and
recharge
Warm storage
temperatures
1. Temperature control
not set properly
1. Reset control
2. Short of refrigerant 2. Leak check, change
drier, evacuate, and
recharge
3. Cabinet location too
warm
3. Relocate
4. Too much refrigerant 4. Change drier,
evacuate, and recharge
5. Low voltage.
Compressor cycling on
overload
5. Check power
6. Condenser dirty 6. Clean
18

SYMPTON PROBABLE CAUSE (S) POSSIBLE SOLUTION
Compressor runs
continuously product too
cold
1. Defective control 1. Replace
2. Control feeler not in
tube properly
2. Assure proper length
in tube
3. Short on refrigerant 3. Leak check change
drier, evacuate, and
recharge
Compressor will not
start no noise
1. Blown fuse or breaker 1. Replace fuse or reset
breaker
2. Defective or broken
wiring
2. Repair or replace
3. Defective overload 3. Replace
4. Defective
temperature control
4. Replace
5. Power disconnected 5. Check service cord or
wiring connections
Compressor will not
start cuts out on
overload
1. Low voltage 1. Contact electrician
2. Defective compressor 2. Replace
3. Defective relay 3. Replace
4. Restriction or
moisture
4. Leak check, replace
drier, evacuate and
recharge
5. Inadequate air over
condenser
5. Clean condenser
6. Defective condenser
fan motor
6. Replace
7. CRO not set properly Reset to 10 psi.
19

SYMPTON PROBABLE CAUSE (S) POSSIBLE SOLUTION
Icing condition in drain
pan under evaporator
1. Low voltage 1. Check voltage at
compressor
2. Cabinet not level 2. Check front to rear
leveling
3. Defective defrost
heater
3. Replace
4. Drain trap does not
have water in it
4. Pour water down
drain
Low suction pressure
Low head pressure
1. CPR not set properly 1. Reset to 10 psi
2. Defective CPR 2. Replace
3. Cap tube blocked due
to moisture or dirt
3. Change drier,
evacuate, and recharge
4. Short of refrigerant 4. Leak check, change
drier, evacuate, and
recharge
Pressures normal -
cabinet warm
1. Top coil blocked with
frost
1. Check defrost system
2. Evaporator oil logged 2. Blow oil out of
evaporator
LIGHT PROBLEMS / SOLUTIONS
Lights won’t work 1. Check light switch
2. Check continuity to ballast
3. Check to see if bulbs inserted
properly in sockets
4. Check voltage
20