Hussmann GGSM Quick guide

January 2006

HUSSMANN - GLOVERSVILLE

INSTALLATION & SERVICE

INSTRUCTIONS

FOR

GGSM SPECIALTY MERCHANDISER

Low Temperature

Glass Front and Sides

P/N OII – GGSM

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

Introduction 3

Inspection 3

Location and Clearance 3

Skid 3

Leveling 3

SerialPlate 4

Access Panel Removal 4

ElectricalBox 4

Power Requirements 4

LightedSign 4

Refrigeration System and Circulation 4

GlassHeaters 5

Electric Condensate Pan 5

DefrostTimeClock 5

Temperature Control 6

Temperature Control Replacement 6

Condenser 6

DefrostStatReplacement 6

Glass Heater Wire Replacement 7

Defrost Heater Replacement 7

BulbBallastReplacement 7

Defrost Timer Replacement ` 7

Thermometer 7

Service Specifications 7 & 8

Trouble Shooting Charts 8 – 10

Warranty and Parts Information 11 &12

INTRODUCTION –

The GGSM-3 is for the display of fro-

zen foods and/or ice cream products. The de-

sign of the cabinet allows mostservice op-

erations to be performed from the front of

the cabinet.

The GGSM-3 is designed to operate in

ambient conditions of 75º F / 24ºC, with hu-

midity levels not to exceed 55%. Conditions

not meeting this criteria will adversely effect

the cabinet performance.

INSPECTION –

The equipment has been skidded and

crated pri or to shipment from the factory. It

is the carrier’s responsibility to deliver it to

you in good condition until s uch time as you

sign for it.

Upon receipt of the cabinet, examine

the packaging for damage. If the packaging

is damaged, make specific notation on the de-

livery ticket as to the location and extent of

damage prior to signing for the piece.

Carefully remove packaging and ex-

amine the cabinet for damage. If damage is

found, contact the delivering carrier immedi-

ately and request that his agent prepare an

inspection report for the purpose of filing a

claim. THIS IS YOUR RESP ONSIBILITY,

NO T T HE F ACTORY’S

LOCATION –

Careful consideration should be given

when locating the cabinet in the store. Loca-

tions where direct sunlight would shine into

the cabinet for extended periods of time, and

locations where drafts from open doors,

air conditioning ducts, fans, and grills would

blow into the cabinet should be avoided

A minimum of 24 inches in the front of

the cabinet and 4 inches in the rear of the

cabinet is required when installing. This

clearance is required for proper intake and

discharge of air over the condensing unit.

SKID –

The shipping skid should be left on the

cabinet until it is placed near its location in

the store. The skid provides protection for

both the cabinet and the floor.

The skid is fas tened to the cabinet base

by 4 bolts located on the underside of the skid

protruding up through the cabinet base with

lock w ashers and nuts. Access for the re-

moval of these bolts is gained by removing the

front and side access panels. Once the nuts

have been removed the cabinet may be lifted

off the shipping skid and set in place.

At this time, the condensing unit area

should be checked for loose wires, tubing rub-

bing or broken, and setting of the timer to

correct time of day. Also check for tightness

of the defrost pins, loose connections on the

timer, etc. before repl acing the access panels.

LEVELING –

Once the cabinet is in place, it should

be leveled. Leveling may be accomplis hed by

using the leveling legs provided with the

cabinet. These legs are located on the under-

side of the cabinet base, in the front two cor-

ners of the base. A slight pitch from front to

rear is desirable for proper draining of the wa-

ter created during the defrost cycle. NEVER

HAVE THE REAR OF THE CABINET

HIGHER THAN THE FRONT !!

The cabinet also comes with four cast-

ers, (non-swiveling or locking), and two han-

dles on the back of the cabinet. These are pro-

vided so the cabinet may be easily moved to a

different location in the store if des ired.

SERIAL PLATE -

The cabinet serial plate is located on the

rear exterior wall of the cabinet. The serial

plate contains pertinent information about the

cabinet such as volts, refrigerant charge, re-

frigerant type, etc. The serial plate should

NEVER be removed or altered in any way.

ACCESS PANEL –

The front acces s panel covers the con-

densing unit compartment. To gain access to

the condensing unit, remove the screws holding

the panel in place. The screws are located on

the exterior underside of the cabinet directly

above the access panel. Once the access panel

has been removed, the condensing unit may be

pulled forward for servicing by removing the

hold down bracket.

ELECTRICAL BOX

–

The electrical component enclosure is

located behind the lower left access panel. Ac-

cess to the enclosure is accomplished by first

removing the front access panel, and then the

side panel. There are two screws in each end

of this panel. The electrical enclosure contains

the main power switch, defrost timer, temper-

ature control, and terminal boards. IMPOR-

TANT – DISCONNECT AL L PO WER TO

CABINET BEFORE SERVICING. THIS IS

FOR YOUR SAFETY – SERIOUS INJURY

OR DEATH MAY RESULT IF THIS IS NOT

DONE !!

POWER REQUIREMENTS –

The cabinet is designed to operate on

120 volts. It comes equipped with a 5-15A

NEMA plug. THE GR OUNDING PRONG

ON THIS PLUG SHOULD NEVER BE RE-

MOVED FOR ANY REASON. THIS IS FOR

EVERYONE'S PROTECTION!

The cabinet also requires a dedicated

circuit to ensure proper voltage is being sup-

plied to the cabinet. All electrical wiring

should conform to local and national specifi-

cations.

LIGHTED SIGN –

The lighted sign has its own on/off

power switch. The switch is located on the

rear of the fixture. The fixture also contains

the ballast and starter. Access to these com-

ponents is gained by removing the four screws

on the rear of the fixture. (Two on each end)

Slide the assembly straight up. Reassemble in

reverse order. ALWAYS REMEMBER TO

DISCONNE CT THE POWER SUPPLY BE-

FORE SERVICING.

REFRIGERATION SYSTEM and

AIR CIRCULATION –

The refrigeration system of the

GGSM-3 utilizes a capillary tube to feed the

evaporator, and a hermetically sealed com-

pressor. When servicing the evaporator

Section, care s hould be taken so as not to dam-

age the capillary tube.

Air is forced through the evaporator by

the use of two fan motors. These motors run

continuously through both the refrigeration

and defrost cycles. Air is taken in by the front

glass and discharged at the top rear of the cabi-

net interior. Care should be taken when l oad-

ing the cabinet with product, not to block these

areas .

GLASS HEATERS –

The front and side glass pieces are

heated through the use of heaters around the

exterior of the glass. These heaters are replace-

able in case of failure. Each piece of glass has

its own heater. The heaters are on continu-

ously. The glass is triple pane LOW-E coated.

ELECTRIC CONDENSATE PAN –

Evaporation of the condens ate water

created during the defrost cycle is accomplished

through the use of an electrically heated pan lo-

cated in the condensing unit are. The heater in

this pan is 300W and is cycled on and off by a

thermostat built into the heater. The drain car-

rying water to this pan should be trapped to

prevent warm air migrating back to the evapo-

rator.

Defrosting of the evaporator is accom-

plished through the use of five cal-rod type

heaters . Thes e heaters are located on the front

of the case under the front glass, on the front of

the evaporator coil, the top middle of the evapo-

rator coil, and the lower rear of the case behind

the evaporator coil. The heaters under the

front glass and cabinet rear are 150 watts each,

the tw o on the front and the top of the evapora-

tor are 350 watts eac h.

DEFROST TIMER –

The defrost timer is a 48 hour timer.

The de frost is factor y s et at two de frosts per

24 hours – at 10:00 a.m. and 10:00 p.m.,

with a 40 minute failsafe.

As previously mentioned, the timer

needs to be set for the correct time of day at

installation. This is accomplished by turn-

ing the knurled adjustment knob counter-

clockwise until the time indicator corre-

sponds to the correct time. If additional de-

frosts are required, extra pins are provided

with the timer for this purpos e, and should

be inserted in the timer face at the time(s)

desired.

The timer will need to be reset after a fail-

ure of the power supply, or if the power is turned

off for an extended period of time.

The defrost cycle is time initiated-

temperature terminated. The defrost stat is lo-

cated on the left hand side of the evaporator, on a

return bend of the tubing near the rear of the

evaporator. When the stat sens es a temperature

of 58ºF / 14ºC the defrost cycle is terminated. If

the stat should fail, then defrost is terminated by

the failsafe setting on the timer.

TEMPERATURE CONTROL –

The temperature control is located in the

electrical enclosure. The control is factory pre-

set to maintain ice cream storage temperatures.

Turning the control clockwise will derive colder

temperatures . The sensing tube for the control is

mounted on the cabinet interior rear wall. Access

to the tube is gained by removing the interior

rear wall panel .

CONDENSER –

The fin and tube condenser requires peri-

odic cleaning. To clean the condenser, remove

the front access panel. Using a soft brush, re-

move the dirt and lint off the fins. A vacuum or

compressed air may also be used. NEVER USE

A HARD OBJECT TO CLEAN THE FINS AS

DAMAGE TO THE CONDENSER MAY OC-

CUR!!

A regular schedule should be established

for the cleaning of the condenser. Failure to keep

the condenser clean will result in premature com-

pressor failure and/ or efficiency loss. Location of

the cabinet in the store and store traffic should be

considered when setting up this s chedule.

TEMPERATURE CONTROL

REPLACEMENT -

If there is product in the cabinet, it

must be placed in a storage freezer. Discon-

nect power to the cabinet. Remove the front

and left side access panels. Remove electri-

cal enclosure cover. Remove the knob on the

control and the two screws holding the plate

and control body in place. Remove the flag

connections from the control. Remove the

interior bottom pans and the rear interior

wall.

The wall has two screws, one in each

uppe r c orner, holding it i n pl ace. The sens -

ing bulb for the control is clamped to the

rear wall. Remove the clamp and replace the

control. Assemble in reverse order, reset

timer, and reconnect the power supply. Al-

low the cabinet to pull down to proper tem-

perature before reloading.

DEFROST STA T RE P LACEMENT -

Remove product from cabinet and place in

another freezer. Disconnect power to the

cabinet. Remove front and left side access

panels. Remove electrical enclosure cover.

Remove proper wires from stat connected to

terminal board. Remove interior bottom

pans. Remove stat from return bend on

evaporator coil and install ne w stat making

s ure retaining clip holds stat to tubing

tightly. Cut wires from old stat and tape

wires to new stat wires. Gently pull old

wires guiding wires through hole penetra-

tion in bottom of case. Connect new wires to

corres ponding numbers on terminal board.

Reset timer and reconnect power to cabinet.

Allow cabinet to pull down to proper tem-

perature before loading.

GLASS HEATER WIRE REPLACEMENT –

Disconnect power to cabinet. Remove

front and left side access panels. Remove electri-

cal enclosure cover. There are four individual

heaters hooked in series. One around each piece

of glass, and one located across the rear top of

the cabinet interior under the light fixture. Con-

nections for these heaters are in each of the four

corners of the cabinet.

To gain acces s to these heaters, remove

the light fixture and lift off the plastic top. Each

heater will have to be tested to find the defective

one. Lift out glass and replace defective heater

with new one exactly as the defective one was in-

stalled. Once heater has been replaced, reas sem-

ble cabinet in reverse order, reset timer and re-

connect power.

DEF ROST HEATER REP LACEMENT –

Remove product from cabinet and place

in storage freezer. Disconnect power to cabinet.

Remove front and left side access panels. Re-

move electrical enclosure cover. Remove bottom

interior pans. After locating defective heater, re-

move from location and install new heater in

place.

If replacing heater on the evaporator coil,

make sure new heater is in direct contact with

coil to ensure proper defrost. Cut wires from old

heater and tape new wires to old wires. Gently

pull wires through hole penetration in bottom of

cabinet and connect to proper terminals on ter-

minal board. Reset timer, and reassemble cabi-

net in reverse order.

BULB / BALLAST REPLACEMENT -

Disconnect power to cabinet. Remove

four screws from rear of fixture and slide as-

sembly straight up. Bulb, ballast and lam-

pholders are now exposed. Replace defective

component and reassemble cabinet. Turn

power to cabinet back on.

DEFROST TIMER REPLACEMENT –

Disconnect power to cabinet. Remove

front and left side access panels. Remove

electrical compartment cover. Remove

screws holding timer in place and install new

timer. Disconnect wires from old timer, one

screw at a time and install on new timer. Set

timer for correct time of day and install de-

frost pins in timer at proper time of day. Re-

assemble in reverse order and turn power

back on.

THERMOMETER –

The thermometer readings are in both

Centigrade and Fahrenheit. The sensing

bulb for the thermometer is located in the

right front of the cabinet near the evaporator

coil. The bulb is in the return air going to

the evaporator. The thermometer may be re-

placed by first removing the light fixture,

then the plastic top, and removing the bot-

tom pans covering the evaporator. Once the

thermometer has been replaced, reassemble

the cabinet in reverse order.

SERVICE SPECIFICATIONS –

Condensing Unit - M4CL-0060CFA

Compressor - Aspera

AFT26CIE-CFA

Relay Ass’y - 514C017-01

Cap Tube - .042 ID x .020 Wall Thick

x 83"

Min. Fuse Size - 15 amps

Refrig. Charge - 23 ounces R 404

652.05 grams

Operating Pressure 75F/24C 90F/32C

Head 215 235

Suction 10 10.5

TROUBLESHOOTING CHART

TROUBLE POSSIBLE CAUSE REMEDY

Compressor starts but

immediately cuts out on

overload.

1. Low voltage 1. Check voltage at cabinet.

Should be within 5% of serial

plate rating

2. Relay defective 2. Replace

Compressor will not start, no

hum.

1. Power disconnected 1. Reconnect power

2. Power switch off 2. Reposition switch to ON

3. Blown or tripped breaker 3. Reset breaker

4. Defective wiring 4. Repair or replace

5. Defective temp control 5. Replace

6. Defective overload 6. Replace

Compressor will not start, hums

but cycles on overload

1. Low Voltage 1. Check voltage at cabinet.

Should not be more than 5%

below serial plate rating.

2. Defective compressor 2. Replace

3. Defective relay 3. Replace

4. Restriction (pinched cap

tube)

4. Replace cap tube

5. Restriction (moisture) 5. Evacuate, replace drier,

recharge

6. Dirty condenser 6. Clean

7. Defective condenser fan

motor

7. Replace

Compressor runs continuously 1. Defective control 1. Replace

2. Short of refrigerant 2. Leak check, change drier,

evacuate, recharge

High head and suction

pressures

1. Air in system 1. Evacuate and recharge

2. Dirty condenser 2. Clean

3. Condenser fan motor not

working

3. Replace

4. Condenser discharge air

blocked

4. Remove obstruction

5. Defrost heater on during

refrigeration (possible defrost

heater joints grounded or time

clock defective)

5. Repair / replace

Low head and suction pressure 1. Short of refrigerant 1. Leak check, change drier

evacuate and recharge

2. Restricted cap tube 2. Replace

3. Coil iced up 3. De-ice and check defrost

cycle

Normal pressures, warm

cabinet

Refrigerant undercharge – Due to the fact that it takes a

considerale amount of undercharge before it has any great effect

on pressures and inaccuracy of gauges it is possible to have an

undercharge of refrigerant. This undercharge will “starve” the

coil and seriously affect the cabinet temperature.

Evaporator coil oil logged. Blow oil out of evaporator with high

pressure, (250-275 pounds), with dry nitrogen

Evaporator coil blocked with

ice

1. Defective time clock 1. Replace

2. Cabinet location in store 2. Move cabinet away from

door or other source of draft

3. Defective defrost heater 3. Replace

4. Defective defrost thermostat 4. Replace

The defrost thermostat should have the defrost circuit in the

closed position when the cabinet goes into defrost. It is set to

open that circuit at 58ºF/14ºC, at which time it also energizes the

solenoid in the time clock which trips the time clock off defrost

and back into the refrigeration cycle. It must be remembered

that when checking the time clock and defrost circuit, that the

time clock can be put into the defrost cycle manually by turning

the time clock dial, but the defrost heater will not come on until

the defrost thermostat temperature has been reduced below

32ºF/ 0ºC.

Defrost cycle too long 1. Terminating on timer

failsafe. (factory set 40 mins)

1. Replace defrost thermostat

The defrost termination thermostat should terminate the defrost

when it senses 58F/-10C.

Time clock mechanism not tripping off defrost due to bad

solenoid in the time clock. If there is an open circuit in the coil

of this solenoid, it will not trip the time clock mechanism off

defrost after the defrost termination thermostat has operated.

To determine if the solenoid is good, turn the clock into defrost.

Place a jumper across X and N at the clock. If the soldnoid is

good this will trip the clock off defrost indicating that it is

working.

Adverse conditions require a longer than normal defrost. Air

currents over and into the cabinet, or a great amount of usage

during conditions of high humidity could create excessive frost.

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