Drawing No. :- TPC301 Issue :- 1 Date :- 22/12/03
HD93 SERVICE MANUAL MODELS
11487TK-US 11488TK-US HDTeak HDTeak
Ebac Industrial Products, Inc. 700 Thimble Shoals Blvd, Suite 109 Newport News, VA. 23606-2575 Tel: (757) Fax: (757) Website www.ebacusa.com

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DESCRIPTION 1.0 SAFETY NOTES & GENERAL ADVICE 2.0 3.0 4.0 5.0 6.0 DISMANTLING NOTES PART NUMBERS SERIAL NUMBERS SPECIFICATIONS GENERAL INFORMATION 6.1 6.2 6.3 6.4 7.0 Basic Principles Refrigeration System Defrost Water Extraction Rules 9 PAGE No. 6 7
COMPONENT FUNCTION 7.1 7.2 Humidistat Controller
COMPRESSOR 8.1 8.2 Starting Electrical Connections
WIRING INFORMATION 9.1 9.2 9.3 Controller Identification pre 57009802 Controller Identification post 57009802 Wiring information

10.0 11.0 12.0

COMPONENT IDENTIFICATION SPARE PARTS LISTING FAULT DIAGNOSIS

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SAFETY NOTES AND GENERAL ADVICE
1. This manual is NOT intended as a comprehensive repair/maintenance guide to the appliance 2. It is ONLY for use by qualified persons having technical competence, applicable product knowledge and suitable service test tools/equipment. 3. Servicing of electrical equipment must be undertaken with the appliance disconnected (unplugged) from the electrical supply. 4. Servicing must be proceeded by, and followed by, an earth continuity and insulation check. 5. Personal safety precautions must be taken to protect against accidents caused by sharp edges on metal and plastic parts. 6. After servicing, the equipment must be re-checked for electrical safety. 7. It may be dangerous to attempt "DIY" repairs/maintenance, Ebac recommends that in the event of any technical service problems advice be sought from their service department.
8. Ebac customer services may be contacted on (757) during normal office hours.
INSTRUCTIONS FOR THE REMOVAL OF THE UNIT FROM THE CABINET
STEP 1 - Remove The Mains Cable And Connector Open the mains cable connector using a screwdriver to lever open the catches either side. Remove the two central fixing screws located inside and pull the connector clear of the back panel. Disconnect the three wires at the back of the connector, making note of their connected positions. STEP 2 - Remove The Unit Fixing Screws Remove the two screws either side of the controls housing at the top front. Remove the two screws from the back panel. STEP 3 - Slide The Unit Out Of The Cabinet

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PART NUMBERS
From the part number you can determine the Model number using 1st & 2nd digit and adding a zero i.e. 11466TK-GB is a Homedry 660 teak for the UK market

HOMEDRY 114

1ST 2ND

COLOUR

COUNTRY

1st Digit 8 9

= = = = =
Refrigeration capacity. A higher number means a higher capacity. 3.9cc Compressor, 337 Watts Cooling 5.6cc Compressor, 510 Watts Cooling 5.9cc Compressor, 590 Watts Cooling 8.85cc Compressor 700 Watts Cooling

2nd Digit 7

= = = =
Controls/functions series (see controller identification) Humidistat, bucket full LED, power on LED Humidistat, 2 speed fan, bucket full LED, bucket 3/4 full LED, power LED. Humidistat, 3 Speed fan & off position, bucket full LED, bucket 3/4 full LED, power on LED. Humidistat, 3 Speed fan & off position, bucket full LED, bucket 3/4 full LED, power on LED, continuous fan switch.

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4.0 SERIAL NUMBER
The current system of date code and serial number is a continuous 8 digit number, the first two digits form the date code and indicate the month and year of manufacture (see table below) the next six digits give the unit number of the individual machine. SERIAL NUMBER - Is located on a sticker behind the water container.

DATE CODE

68 123456

UNIT NUMBER

DATE CODE Jan Feb Mar Apr May Jun July Aug Sep Oct Nov Dec (This is a 96 digit number sequence which repeats every 8 years) 95 96

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5.0 SPECIFICATIONS
UNIT TYPE HOMEDRY HOMEDRY 11487TK-US Unit Height mm Unit Width mm Unit Depth mm Weight (EMPTY) kg Operating Range Max Water Extraction Rate (32c @ 90% RH) Typical water Extraction Rate (18c @ 55% RH) Power consumption (18c @55% RH) Refrigerant Charge R134a Compressor (Figures quoted are for Tecumseh / Embraco) Capillary Fuse Rating Filter Dryer 18.Litres/day 125ml/hr 305 watts 185g 287 18.Litres/day 125ml/hr 305 watts 185g 13C/55F to 35C/95F 11488TK-US

AZ0413YS AZ0413YS 5.9cc 5.9cc 590 watts 590 watts 0.036 x 0.036 x 1000mm 1000mm 5 amps (After Year 2000) XH7 XH7

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6.0 GENERAL INFORMATION 6.1

BASIC PRINCIPLES

The purpose of a dehumidifier is to extract water from the air, in order that dampness or condensation in the house is reduced. Unlike an air conditioner a dehumidifier does not cool the air. The air being passed through the system is warmed before being recirculated which results in a slight rise in temperature. A dehumidifier is basically a refrigeration system with a fan to provide air circulation. The fan draws air over the evaporator coil which provides a large cold surface area on which the moisture in the air condenses. The system condenser is positioned between the evaporator and the fan in order to warm the cold dry air before blowing it back into the room. The water that condenses runs into a drain tray and is collected in a water container.

REFRIGERATION SYSTEM

The evaporator (tubes visible through the air filter) are cooled by a refrigeration system which utilises a compressor to pump refrigerant around a hermetically sealed circuit. The exact amount of refrigerant is carefully metered into the unit during manufacture. This is vital for effective operation. When the unit is correctly charged the evaporator temperature will typically be at O`C when the air temperature is between 24`C and 28`C. The evaporator temperature varies with air temperature and humidity. The higher the air temperature and humidity the higher the evaporating temperature. When correctly charged the evaporator will be wet/frosted between 3/4 and all the way along its visible section. Note: The dehumidifier does not reach working temperature until approximately 30 minutes after switch on.

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DEFROSTING
At low air temperatures the evaporator operates below 0'C and hence the moisture extracted from the air freezes on the evaporator coils. This frost is periodically removed by an automatic defrost system known as IDS:- Defrost mode is, compressor off, fan on, The warm air melts the frost. The defrost duration and time between defrost cycles vary according to air temperature. Above 35'C IC no defrost occurs.
WATER EXTRACTION GENERAL RULES
The amount of water extracted will depend on the amount of water in the air. As a general rule, the colder the outside temperature, the less water will be in the air. Do not position the dehumidifier near a radiator or outside door as this will reduce the effectiveness. Water extraction varies with the following parameters: Air temperature Air humidity Unit positioning Unit fan speed setting (higher fan speed, higher extraction) Loss of refrigeration charge (gives low extraction, note less than half the evaporator will be wet or frosted). See technical specification for typical water extraction information.

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7.0 COMPONENT FUNCTION
7.1 Humidistat -Will switch the unit on/off in response to changing humidity. The humidistat is effectively a nylon membrane and micro switch. The nylon membrane shortens as it dries, and the shortening effect switches a micro-switch, which turns the fan and the compressor off. If the humidistat is ever examined it is vital that all the sealing around the controls compartment is replaced else the humidistat will not see room air. Control Module - Is located on top of the fan housing (clam shell). The latest module is microprocessor controlled and performs 4 basic functions:-
a). Fan speed/continuous Fan speeds are determined by switching power resistors into the fan supply circuit in high speed, two power resistors re working in parallel. b).Timed Defrost See general operation earlier. The temperature sensor that determines the defrost/run cycle is located on the same PCB as the power and bucket LED'S. If the sensor is ever examined it is vital that all sealing around the controls compartment is replaced, else the sensor will not see the correct ambient temperature.
c).Bucket Level Switches A float and lever system at the rear of the water container activates 2 NC micro-switches (1 in 400 models). the LHS micro-switch is the bucket full switch. The RHS switch being the bucket 3/4 full. If the water container is not in position, the switches are NC and the unit cannot be started. When the empty container is in position and the door closed, both switches are open and the unit can be started. When the container is 3/4 full, the RHS micro-switch closes and the red LED flashes. When the container is full the LHS micro-switch closes, the red LED is full on and the unit stops running. d).Compressor 4 Minute Delay When a refrigeration compressor is switched off manufacturers advise against switching straight back on in order to allow the refrigerant pressures to equalise. If the dehumidifier is switched off by any means, except at the mains, the compressor will automatically stay off for 4 minutes.

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8.0 COMPRESSOR
8.1 Starting The compressor is hermetically sealed and is not serviceable except for the electrical components located inside the plastic cover. When the compressor starts up it starts on two sets of windings called, start windings and run windings. After a fraction of a second the start relay drops the start windings out of the circuit and the compressor runs on run windings only.

If the start windings are not dropped out then the overload protector will trip the power after 5 to 10 seconds. The overload protector resets itself after a few minutes.

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8.2 Electrical Connections
Brazing The 1/4" suction and process connections on the compressor are copper. The recommended braze rods on these connections are Phos 2. The 3/16" discharge connection is steel. The recommended braze rods on these connections are 30% silver solder. On 900 Series all connections on the compressor are copper. Re-Charge When re-charging the compressor the system should be vacuum dehydrated down to a pressure of 1 mbar. Also the capillary tube and filter drier must be changed. The charge should be accurately metered into the quantity specified on the rating label. The rating label is located behind the water container.

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9.0 9.1
WIRING INFORMATION CONTROLLER IDENTIFICATION PRE SERIAL No: 57009802

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9.2 PCB IDENTIFICATION FROM SERIAL No: 57009802
This core PCB is now a standard fitting to all HD93 models after serial number 57009802. It is accompanied by a different array of switches depending on the model. Defrost cycles are also common to all models.
Indicator board Wires to H/stat Temp sensor Power indicator (green) 9-way ribbon cable
Bucket -full indicator (red)
Fan / switch (COM) Continuous fan switch Bucket full (NC) Fan switch Bucket full (NO)
T1 T2 T3 T4 T5 Not used on 114X4 Not used on 114X4,114X6,114X7
full (NO) Bucket full (COM) Continuous fan switch Compressor live (OHP) Compressor neutral (relay) Fan neutral

T6 T7 T8 T9 T10 T11

Not used on 114X4
Not used on 114X4,114X6,114X7

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9.3 WIRING INFORMATION
Wiring information(after serial 57009802) for models:- 11444 (440), 11464 (640)

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Wiring information (after serial 57009802) for models:- 11446 (460), 11466 (660)

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Wiring information (after serial 57009802) for models:- 11447 (470), 11467 (670), 11487 (870), 11497 (970)

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Wiring information (after serial 57009802) for models:- 11448 (480), 11488 (880), 11498 (980)

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10.0 COMPONENT IDENTIFICATION

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6&7

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SPARES LIST

NO Part Number Description HUMIDISTAT HUMIDISTAT KNOB CONDENSER COIL CAPILLIARY COMPRESSOR BOX COVER OHP RELAY COMPRESSOR MOTOR AXIAL FAN PCB (870 MODEL ONLY) PCB (880 MODEL ONLY) LEVER, MICROSWITCH FLOAT MICROSWITCH MAINS POWER CABLE 2m EVAPORATOR 600 GREEN INDICATOR LENS RED INDICATOR LENS BLACK CABLE CLIP FAN MOTOR BRACKET CABINET / GRILLE BRACKET POLYSTYRENE BAFFLE FRONT GRILLE BUCKET DOOR BUTTON CONTROLS HOUSING TINTED CONTROL COVER FLAP BLANK / DUMMY BUTTON FAN SPEED KNOB FILTER DRYER BUCKET DOOR CATCH

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FAULT DIAGNOSIS
SAFETY NOTE: Do not remove the cabinet unless the unit is removed from the power supply.
SYMPTOM Unit Dead, Indicators OFF Unit Dead, Indicators ON Fan Running & Compressor Dead Faulty Fan Speeds Undercharge/Blockages Defrost Poor Performance
POSSIBLE CAUSES Faulty/loose mains lead Loose wiring Faulty PCB Loose wiring Faulty PCB Loose wiring Faulty PCB Compressor Fault Faulty Switch Faulty PCB Ribbon Cables Loose Leakage in fridge circuit Faulty PCB Polystyrene baffle missing Sealing around controls missing Positioning of unit Low/High refrigerant charge Dirty/blocked air filter

REMARKS

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LIMITED WARRANTY

Our products carry a one-year unconditional warranty against any defects in workmanship or material. This warranty will cover all parts and labor required to repair your Ebac product. This warranty is invalid if the unit has been abused, damaged, whether intentional or accidental, or if any modifications have been made to the unit. THE FOREGOING WARRANTY IS EXCLUSIVE AND IS ISSUED IN LIEU OF ALL OTHER WARRANTIES (WHETHER WRITTEN, ORAL, OR IMPLIED) INCLUDING THE WARRANTY OF MERCHANTABILITY AND THE WARRANTY OF FITNESS FOR A PARTICULAR PURPOSE. EBAC INDUSTRIAL PRODUCTS, INC. DISCLAIMS ANY LIABILITY FOR CONSEQUENTIAL DAMAGES, LOST PROFITS, OR INCIDENTAL DAMAGES FOR BREACH OF ANY WRITTEN OR IMPLIED WARRANTY WITH RESPECT TO THE FOREGOING DESCRIBED MERCHANDISE. For Your Records: Model: ____________________ S/N: ______________________ Date Received: ______________
SAVE THIS SECTION FOR YOUR RECORDS CLIP AND RETURN THIS CARD

PLEASE NOTE

WARRANTY REGISTRATION
DATE MODEL ___________ S/N ________________ RECEIVED ________________ OWNER __________________________________________________________ ADDRESS ________________________________________________________ CITY __________________________ STATE ________ ZIP _______________ COMMENTS ______________________________________________________ _________________________________________________________________ Ebac Industrial Products. 700 Thimble Shoals Boulevard, Suite 109, Newport News, Virginia. 23606-2575
To ensure that your Ebac Dehumidifier is accorded the full coverage provided by this warranty, please complete and mail this card at your earliest convenience.

Thank You

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