Hussmann DDS Kurzanleitung

January 2006

HUSSMANN - GLOVERSVILLE

INSTALLATION & SERVICE

INSTRUCTIONS

FOR

DDS – DDSS SELF-CONTAINED AND REMOTE

Multi-deck, Spot display

Refrigerator Merchandisers

P/N OII – DDS, DDSS Merchandisers

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

SECTION 1 General Information Page 3

SECTION2 Installation Page4

SECTION3 Refrigeration Page5

Self Contained Models

SECTION4 Refrigeration Page6

Remote Models

SECTION 5 Electrical Page 12

SECTION 6 Replacement Parts List Page 14

SECTION 7 User Instructions Page 20

SECTION 8 Service Tips and Wiring Diagrams Page 22

Page 3

SECTION 1

GENERAL INFORMATION

MODEL DESCRIPTION

The DDS model series are multi-deck, spot merchandisers designed for medium temperature

applications such as: deli/dairy/beverage/floral. They are available as either remote type

models, which require separate condensing unit connections, or self-contained models. Each

self-contained model will have it’s own condensing unit, factory installed beneath the display

area of the case ready for operation when electrical service is connected.

The following table lists the standard models with a brief description of each, including the

electrical requirements of the self-contained model. Unless otherwise specified, the electrical

requirements for the remote model will be 120 volt, 60 hertz (Hz).

MODEL ELECTRICAL DESCRIPTION

MODEL

DESCRIPTION

ELECTRICAL SERVICE

DDS/DDF-4B Self-Contained 4’ Merchandiser 115 / 60 Hz / 1

∅

DDS/DDF-4D/G Self-Contained 4’ Merchandiser 230v - 208v / 60 Hz / 1

∅

DDS/DDF-6D/G Self-Contained 6’ Merchandiser 230v - 208v / 60 Hz / 1

∅

DDS/DDF-8D/G Self-Contained 8’ Merchandiser 230v - 208v / 60 Hz / 1

∅

DDS/DDF-4R Remote Type 4’ Merchandiser 115 / 60 Hz / 1

∅

DDS/DDF-6R Remote Type 4’ Merchandiser 115 / 60 Hz / 1

∅

DDS/DDF-8R Remote Type 4’ Merchandiser 115 / 60 Hz / 1

∅

DDSS-4D/G Self-Contained 4’ Merchandiser 230v- 208v / 60 Hz / 1

∅

Symbol

∅

denotes

PHASE

APPLICATION

These models are designed for use only in air-conditioned stores where temperature is 75

F or

less and relative humidity does not exceed 55%.

HUSSMANN - GLOVERSVILLE

03 Page4

SECTION 2

INSTALLATION

SHIPPING DAMAGE

All equipment should be examined for shipping damage before and during unloading. If there is

any damage, the carrier should be notified immediately and an inspection requested. The

delivery receipt must be noted that equipment was received damaged. If damage is of a

concealed nature, we suggest the carrier be contacted immediately, or no later than (3) days

following delivery. The consignee for all damages must file a claim with the carrier.

SHIPPING BRACES

Move the fixture as close as possible to its permanent location then remove all packaging and

shipping braces. Remove all separately packed accessories such as kits, shelves, etc.

EXTERIOR LOADING

These cases are not structurally designed to support excessive external loading such as the

weight of a person, therefore, do not walk on the top of these refrigerators or damage to the

refrigerator and serious personal injury could occur.

LOCATION

These refrigerators, like other open refrigerators, are sensitive to air disturbances. Air currents

passing around them will seriously impair their operation. Do not allow air-conditioning,

electric fans, open doors or windows, etc. to create air currents around these cases.

DO NOT INSTALL THE VENTED PANELS OF THE SELF-CONTAINED MODELS

AGAINST A WALL OR OTHER STORE FIXTURE.

Located in the lower front and rear of the self-contained models are vented panels. These panels

allow air circulation to the condensing unit. Blocking or restricting air circulation through these

panels can cause poor performance and damage the refrigeration system.

INSTALL THE REFRIGERATOR NO CLOSER THAN (4) FOUR INCHES FROM A WALL OR OTHER

STORE FIXTURES.

HUSSMANN - GLOVERSVILLE

07/02/03

Page 5

SECTION

REFRIGERATION

SELF CONTAINED MODELS

Each self-contained model is equipped with its own condensing unit located beneath the display

area. The unit will be charged per nameplate refrigerant and shipped fromthe factory with all

service valves open, completely ready for operation when electrical power has been connected.

REFRIGERANT

CHARGE

MODEL REFRIGERANT POUNDS OUNCES

DDS/DDF-4B R - 22 5 8

DDS/DDF-4D/G R - 22 5 8

DDS/DDF-6D/G R - 22 7 11

DDS/DDF-8D/G

R – 404A

DDS – 4D/G c/w

Condensing

Unit

R - 22

DDSS – 4D/G

R-22

CONTROLS and ADJUSTMENTS

REFRIGERATION

CONTROLS

DISCHARGE AIR

TEMPERATURE

DEFROST

FREQUENCY

DEFROST CONTROLS

PRESSURE

TERMINATION

FAILSAFE

to 34

Every

6 Hours

90 psig (R-22)

105 psig (R-404A)

Minutes

A refrigeration thermostat controls refrigeration temperature. The control is factory

installed in the control panel. Adjust this thermostat to maintain the discharge air

temperature shown. Measure discharge air temperatures at the center of the discharge

honeycomb.

Defrosts are time-initiated and pressure terminated. The defrost timer is factory set a

shown. Check that the above settings are implemented and correct, and that the cloc

indicated the correct time of day.

Defrost must be terminated by defrost termination setting.

HUSSMANN - GLOVERSVILLE

07/02/03 Page 6

SECTION 4

REFRIGERATION - REMOTE MODELS

REFRIGERANT PIPING

Refrigerant line connection sizes: All models LIQUID LINE 3/8” OD

SUCTION LINE 5/8” OD for 4’ & 6’ Models; 1 1/8” for all other models

These connections are made at the right hand end of the cases (facing front) beneath the

refrigerated display area. Refrigerant lines should be sized as shown on the refrigeration legend

(furnished by the owner). If a legend has not been furnished, refer to Section 12 of the

Hussmann Application Engineering Manual for guidance.

OUTLET LOCATION

The refrigerant line outlet is located at the right hand end of the refrigerator beneath the display

pans. After connections have been made, seal this outlet thoroughly both on the inside and the

outside. An aerosol dispensed urethane type of insulation is recommended.

LINE SIZING

Refrigerant lines should be sized as shown on the refrigeration legend prepared for the store and

as (furnished by the owner). If a legend has not been furnished, refer to Section 12 of the

Hussmann Application Engineering Manual for guidance.

OIL TRAPS

P-traps (oil traps) must be installed at the base of all suction line vertical risers.

PRESSURE DROP

Pressure drop reduces capacity of the refrigeration system. To minimize pressure drop, use

proper size tubing, keep the refrigerant line runs as short as possible and use a minimum number

of elbows. Where elbows are needed, use long radius elbows only.

PIPING INSULATION

For refrigerators with other than KOOLGAS defrost, the suction and liquid lines should be

clamped and/or taped together and insulated for a minimum of 30 feet from the refrigerator.

Refrigerators with KOOLGAS defrost should not have their liquid and suction lines in contact

with each other but are to be separately insulated for a minimum of 30 feet from the refrigerator.

Additional insulation for the balance of the refrigerant lines is recommended and required

wherever condensation and dripping would be objectionable.

HUSSMANN - GLOVERSVILLE

07/02/03 Page 7

EXPANSION VALVE ADJUSTMENT

Expansion valves must be adjusted to fully feed the evaporator. Before attempting to adjust

valves, make sure the evaporator is either clear of / or only lightly covered with frost, and that

the fixture is within 10°F of it’s expected operating temperature.

Adjust the valve as follows:

A. Attach a probe to the suction line near the expansion valve bulb.

B. Obtain a pressure reading from the factory installed Schraeder valve. Convert

the pressure reading to a saturated temperature for the appropriate refrigerant

Temperature B minus Temperature A = Superheat

Some “hunting” of the expansion valve is normal. The valve should be adjusted so that during

the hunting the greatest difference between the two temperatures is 3°F to 5°F.

With this adjustment, during a portion of the hunting the temperature difference between the

probes will be less than 3°F (at times as low as 0°F).

Make adjustments of no more than (1/2) turn of the valve stem at a time and wait for at

least fifteen minutes before rechecking the probe temperature and making further

adjustments.

HUSSMANN - GLOVERSVILLE

07/02/03 Page 8

REFRIGERATION & DEFROST CONTROLS FOR

CONVENTIONAL OPERATION (Single Compressor System)

Refrigeration temperature may be controlled by either the condensing unit’s low-pressure

control or by refrigeration thermostat (optional / one per condensing unit). Thermostatic control

is preferred since it will provide a more constant year-round control of temperature. The

thermostat may be field or factory installed, must have a differential of 3°F to 6°F and have its

sensing bulb located to monitor the air leaving the evaporator. One thermostat per condensing

unit is required and should be wired into the compressor motor contactor control circuit.

A pump down system is recommended for outdoor condensing units.

DEFROST:

DDS models have defrost cycles that are time initiated and time terminated.

REFRIGERATION CONTROLS DEFROST CONTROLSf

LOW PRESSURE CONTROL SETTINGS DEFROST TIMER

If used to control

dtemperature

If thermostat controls

etemperature

Discharge

Air

Temp

(Cut-out) (Cut-out) (Cut-in) (Cut-out) (Cut-in)

Defrost

Frequency

Failsafe

Length

Termination

Pressure

28°Fc

Convert

Temperatures

to Pressures for

type of

Refrigerant

Used

12°F 30°F -7°F 26°F

Every

6 Hours

45 Min

90 psig

cMeasure discharge air temperatures at the center of the honeycomb. If thermostat is

used to control temperature, set thermostat to open contacts at the discharge air

temperature given in the table.

dAdjust the cutout on the low-pressure control to stop the compressor at the discharge

temperature given in the table. Final adjustment should be made after refrigerator is

stocked with product. If cycle frequency is more than 4 times per hour, cycling should

produce an average discharge air temperature as shown above.

eThese settings are acceptable for outdoor unit applications when the coldest expected

ambient does not go below 0°F. If colder ambient temperatures are expected, set

control accordingly per “Hussmann Condensing Unit Installation Instructions.

fIf these spot display refrigerators are to be multiplexed with a different type refrigerator,

compare these defrost settings with those specified for the other refrigerator. If the

settings are not compatible, refer to page 15 (Controls & adjustments – Mixed

Multiplexing).

HUSSMANN - GLOVERSVILLE

07/02/03 Page 9

REFRIGERATION & DEFROST CONTROLS FOR

CONVENTIONAL OPERATION - Mixed Multiplexing (Parallel Racks)

Refrigeration temperature may be controlled by a refrigeration thermostat sensing discharge air

temperature. The thermostat controls a liquid line solenoid (optional) or a suction line solenoid

(optional). The use of an evaporator pressure regulator (EPR) is recommended to allow fixture

to refrigerate at steady levels.

DEFROST:

DDS models have defrost cycles that are time initiated and time terminated.

REFRIGERATION

CONTROLS

DEFROST CONTROLS d

DEFROST TIMER

Length of Defrost

MODEL

DISCHARGE

AIR TEMP c

(Cut-out)

DEFROST

Frequency Off-Time/Electric KOOLGAS

ALL 28°F Every 6 Hours 45 Min e14 Min

cDischarge air temperature is to be measured by attaching a service thermometer to the

discharge honeycomb at the centre of the case.

dAdjust the refrigeration thermostat or EPR valve to maintain the discharge air

temperature shown above.

eIf these spot display refrigerators are to be multiplexed with a different type refrigerator,

compare these defrost settings with those specified for the other refrigerator. If these

settings are not compatible, refer to the following page.

fKOOLGAS defrost is time initiated and time terminated. The defrost lengths listed

above are based upon laboratory testing but operation under actual store conditions may

require that they be lengthened to accomplish a thorough defrost. Some of the store

conditions that can contribute to a longer defrost are: low head pressure, long runs of

refrigerant lines, store ambient, fixture temperature operating lower than that

recommended, seasonal ambient changes etc.

Each system shown on the “store legend” must have staggered defrosts to maintain stable

compressor loading and a sufficient supply of defrost gas.

HUSSMANN - GLOVERSVILLE

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