MHDC - 2004 MHDC Horizontal Ducted Condensing Unit Models: MHDC 020 A/AR MHDC 025 A/AR MHDC 030 A/AR
Contents Introduction To Horizontal Ducted Condensing Unit ................................................. 1 Specifications .................................................................................................................2 Refrigerant Circuit ........................................................................................................12 Outlines And Dimension .............................................................................................17 Wiring Diagrams..........
Introduction To Horizontal Ducted Condensing Unit Invisible & Evergreen To make your condensing unit invisible by installing it above the ceiling with only the supply and return grille exposed to view. This ceiling concealed ducted condensing type of design has made it an “evergreen” design without sacrificing the precious floor space. Space Saving The physical height of 436mm is offering greatest flexibility in selecting installation locations.
Specifications WALL MOUNTED - MWM F SERIES (COOLING ONLY) MODEL INDOOR UNIT OUTDOOR UNIT COIL FIN TUBE FIN COIL PIPE OUTDOOR UNIT FAN COMPRESSOR INDOOR UNIT TUBE FAN NOMINAL COOLING CAPACITY EFFECTIVE TOTAL POWER NOMINAL TOTAL POWER NOMINAL TOTAL CURRENT POWER SOURCE REFRIGERANT / CONTROL FAN TYPE AIR FLOW FAN MOTOR RATED INPUT POWER RATED RUNNING CURRENT FAN MOTOR PROTECTION MATERIAL TUBE PATTERN DIAMETER THICKNESS MATERIAL THICKNESS ROW FIN PER INCH FACE AREA HEIGHT DIMENSION WIDTH DEPTH WEIGH
CEILING CONVERTIBLE – MCM D SERIES (COOLING ONLY) INDOOR UNIT OUTDOOR UNIT NOMINAL COOLING CAPACITY EFFECTIVE TOTAL POWER NOMINAL TOTAL POWER NOMINAL TOTAL CURRENT POWER SOURCE REFRIGERANT / CONTROL AIR FLOW FAN MOTOR RATED INPUT POWER RATED RUNNING CURRENT MATERIAL DIAMETER THICKNESS MATERIAL THICKNESS ROW FIN PER INCH FACE AREA HEIGHT DIMENSION WIDTH DEPTH WEIGHT SOUND PRESSURE LEVEL ( H / M / L ) ROOM TEMPERATURE CONTROL AIR DISCHARGE OPERATION CONDENSATE DRAIN SIZE AIR FILTER PACKING HEIGHT DIMENSION WI
CEILING CASSETTE – MCK A SERIES (COOLING ONLY) MODEL INDOOR UNIT OUTDOOR UNIT COIL INDOOR UNIT TUBE FIN COIL PIPE OUTDOOR UNIT FAN COMPRESSOR FIN TUBE FAN NOMINAL COOLING CAPACITY EFFECTIVE TOTAL POWER NOMINAL TOTAL POWER NOMINAL TOTAL CURRENT POWER SOURCE REFRIGERANT / CONTROL AIR FLOW FAN MOTOR RATED INPUT POWER RATED RUNNING CURRENT MATERIAL DIAMETER THICKNESS MATERIAL THICKNESS ROW FIN PER INCH FACE AREA DIMENSION HEIGHT ( ) - WITH PANEL WIDTH DEPTH WEIGHT (UNIT + PANEL) SOUND PRESSURE LEVE
CEILING CASSETTE – MCK B SERIES (COOLING ONLY) MODEL INDOOR UNIT OUTDOOR UNIT COIL INDOOR UNIT TUBE FIN COIL PIPE OUTDOOR UNIT FAN COMPRESSOR FIN TUBE FAN NOMINAL COOLING CAPACITY EFFECTIVE TOTAL POWER EFFECTIVE TOTAL CURRENT NOMINAL TOTAL POWER NOMINAL TOTAL CURRENT POWER SOURCE REFRIGERANT / CONTROL AIR FLOW FAN MOTOR RATED INPUT POWER RATED RUNNING CURRENT MATERIAL DIAMETER THICKNESS MATERIAL THICKNESS ROW FIN PER INCH FACE AREA DIMENSION HEIGHT ( ) - WITH PANEL WIDTH DEPTH WEIGHT ( UNIT + PA
CEILING CONCEALED – MCC C SERIES (COOLING ONLY) MODEL INDOOR UNIT OUTDOOR UNIT COIL FIN TUBE FIN COIL PIPE OUTDOOR UNIT FAN COMPRESSOR INDOOR UNIT TUBE FAN NOMINAL COOLING CAPACITY EFFECTIVE TOTAL POWER NOMINAL TOTAL POWER NOMINAL TOTAL CURRENT POWER SOURCE REFRIGERANT / CONTROL AIR FLOW STATIC PRESSURE FAN MOTOR RATED INPUT POWER RATED RUNNING CURRENT MATERIAL DIAMETER THICKNESS MATERIAL THICKNESS ROW FIN PER INCH FACE AREA HEIGHT DIMENSION WIDTH DEPTH WEIGHT SOUND PRESSURE LEVEL ( SH* / H /
WALL MOOUNTED – MWM F SERIES (HEATPUMP) COIL FIN TUBE FIN COIL PIPE OUTDOOR UNIT FAN COMPRESSOR INDOOR UNIT TUBE FAN MODEL INDOOR UNIT OUTDOOR UNIT NOMINAL COOLING CAPACITY NOMINAL HEATING CAPACITY EFFECTIVE TOTAL POWER (COOLING) EFFECTIVE TOTAL POWER (HEATING) NOMINAL TOTAL POWER (COOLING) NOMINAL TOTAL POWER (HEATING) NOMINAL TOTAL CURRENT (COOLING) NOMINAL TOTAL CURRENT (HEATING) POWER SOURCE REFRIGERANT / CONTROL FAN TYPE AIR FLOW FAN MOTOR RATED INPUT POWER RATED RUNNING CURRENT FAN MOTOR P
CEILING CONVERTIBLE – MCM D SERIES (HEATPUMP) MODEL INDOOR UNIT OUTDOOR UNIT COIL INDOOR UNIT TUBE FIN COIL PIPE OUTDOOR UNIT FAN COMPRESSOR FIN TUBE FAN NOMINAL COOLING CAPACITY NOMINAL HEATING CAPACITY EFFECTIVE TOTAL POWER (COOLING) EFFECTIVE TOTAL POWER (HEATING) NOMINAL TOTAL POWER (COOLING) NOMINAL TOTAL POWER (HEATING) NOMINAL TOTAL CURRENT (COOLING) NOMINAL TOTAL CURRENT (HEATING) POWER SOURCE REFRIGERANT / CONTROL AIR FLOW FAN MOTOR RATED INPUT POWER RATED RUNNING CURRENT MATERIAL DIAM
CEILING CASSETTE – MCK A SERIES (HEATPUMP) MODEL INDOOR UNIT OUTDOOR UNIT COIL INDOOR UNIT TUBE FIN COIL PIPE OUTDOOR UNIT FAN COMPRESSOR FIN TUBE FAN NOMINAL COOLING CAPACITY NOMINAL HEATING CAPACITY EFFECTIVE TOTAL POWER (COOLING) EFFECTIVE TOTAL POWER (HEATING) NOMINAL TOTAL POWER (COOLING) NOMINAL TOTAL POWER (HEATING) NOMINAL TOTAL CURRENT (COOLING) NOMINAL TOTAL CURRENT (HEATING) POWER SOURCE REFRIGERANT / CONTROL AIR FLOW FAN MOTOR RATED INPUT POWER RATED RUNNING CURRENT MATERIAL DIAMETE
CEILING CASSETTE – MCK B SERIES (HEATPUMP) MODEL INDOOR UNIT OUTDOOR UNIT COIL INDOOR UNIT TUBE FIN COIL PIPE OUTDOOR UNIT FAN COMPRESSOR FIN TUBE FAN NOMINAL COOLING CAPACITY NOMINAL HEATING CAPACITY EFFECTIVE TOTAL POWER (COOLING) EFFECTIVE TOTAL POWER (HEATING) NOMINAL TOTAL POWER (COOLING) NOMINAL TOTAL POWER (HEATING) NOMINAL TOTAL CURRENT (COOLING) NOMINAL TOTAL CURRENT (HEATING) POWER SOURCE REFRIGERANT / CONTROL AIR FLOW FAN MOTOR RATED INPUT POWER RATED RUNNING CURRENT MATERIAL DIAMETER
CEILING CONCEALED – MCC C SERIES (HEATPUMP) MODEL INDOOR UNIT OUTDOOR UNIT COIL FIN TUBE FIN COIL PIPE OUTDOOR UNIT FAN COMPRESSOR INDOOR UNIT TUBE FAN NOMINAL COOLING CAPACITY NOMINAL HEATING CAPACITY EFFECTIVE TOTAL POWER (COOLING) EFFECTIVE TOTAL POWER (HEATING) NOMINAL TOTAL POWER (COOLING) NOMINAL TOTAL POWER (HEATING) NOMINAL TOTAL CURRENT (COOLING) NOMINAL TOTAL CURRENT (HEATING) POWER SOURCE REFRIGERANT / CONTROL AIR FLOW STATIC PRESSURE FAN MOTOR RATED INPUT POWER RATED RUNNING CURRENT
MODEL : MHDC020A Refrigerant Circuit 12
13 MODEL : MHDC025 / 030A
14 MODEL : MHDC030A (NCT)
15 MODEL : MHDC020AR
16 MODEL : MHDC025 / 030AR
Outlines And Dimension MODEL : MHDC 020 / 025 / 030 A/AR 17
Wiring Diagrams Wall Mounted Indoor Unit Model : MWM 020 / 025F Outdoor Unit Model : MHDC 020 / 025A 18
Wall Mounted Indoor Unit Model : MWM 031F Outdoor Unit Model : MHDC 030A 19
Indoor Unit Model : MWM 020 / 025FR Outdoor Unit Model : MHDC 020 / 025AR 20
Indoor Unit Model : MWM 030FR Outdoor Unit Model : MHDC 030AR 21
Ceiling Convertible Indoor Unit Model : MCM 020 / 025D Outdoor Unit Model : MHDC 020 / 025A 22
Indoor Unit Model : MCM 030D Outdoor Unit Model : MHDC 030A 23
Indoor Unit Model : MCM 020 / 025DR Outdoor Unit Model : MHDC 020 / 025AR 24
Indoor Unit Model : MCM 030DR PCB NEUTRAL Outdoor Unit Model : MHDC 030AR 25
Ceiling Cassette A Series Indoor Unit Model : MCK 020 / 025A Outdoor Unit Model : MHDC 020 / 025A 26
Indoor Unit Model : MCK 030A Outdoor Unit Model : MHDC 030A 27
Indoor Unit Model : MCK 020 / 025AR Outdoor Unit Model : MHDC 020 / 025AR 28
Indoor Unit Model : MCK 030AR PCB NEUTRAL Outdoor Unit Model : MHDC 030AR 29
Ceiling Cassette B Series Indoor Unit Model : MCK 020 / 025 / 030B Outdoor Unit Model : MHDC 020 / 025 / 030A 30
Indoor Unit Model : MCK 020 / 025BR Outdoor Unit Model : MHDC 020 / 025AR 31
Indoor Unit Model : MCK 030BR PCB NEUTRAL Outdoor Unit Model : MHDC 030AR 32
Ceiling Concealed Indoor Unit Model : MCC 020 / 025C Outdoor Unit Model : MHDC 020 / 025A 33
Indoor Unit Model : MCC 030C (For export spec. With SLM control U1.
Indoor Unit Model : MCC 020 / 025CR Outdoor Unit Model : MHDC 020 / 025AR 35
Indoor Unit Model : MCC 030CR PCB NEUTRAL Outdoor Unit Model : MHDC 030AR 36
Installation Caution Sharp edges and coil surfaces are potential injury hazard. Avoid from contact with them. (1) Installation Of Indoor Unit For installation of indoor unit, please refer to the indoor unit technical manual. (2) Installation Of Outdoor Unit The outdoor unit has to be installed as per recommended installation clearance (Diagram A) Make sure that the location is suitable for piping and drainage. Precaution steps as below : i) Use the hanging bracket supplied with the unit.
(3) Refrigerant Piping Maximum Pipe Length And Maximum Number Of Bends • When the pipe length becomes too long, both the capacity and reliability drop. As the number of bends increases, system piping resistance to the refrigerant flow increases, thus lowering the cooling capacity, and as the result the compressor may become defective. Always choose the shortest path and follow the recommendation as tabulated below: MODEL DATA Max. Length, L Max. Elevation, H Max. No.
(4) Wiring Wiring Electrical Connections • Wiring regulations on wire diameters differ from country to country. Please refer to your LOCAL ELECTRICAL CODES for field wiring rules. Be sure that installation comply with such rules and regulations. General Precautions • Ensure that the rated voltage of the unit corresponds to the name plate before carrying out proper wiring according to the wiring diagram. • Provide a power outlet to be used exclusively for each unit.
(6) Additional Charge • The refrigerant gas has already charged into the outdoor unit. For the piping length of 5m. Additional refrigerant charge after vacuuming is not necessary. • When the piping length is more than 5m, please use the table below (unit in gram). MODEL 7m 10m 15m MHDC020A/AR 40 100 200 MHDC025A/AR 80 200 400 MHDC030A/AR 90 225 450 (7) Overall Checking • Ensure the following, in particular : 1) The unit is mounted solidly and rigid in position.
Servicing And Maintenance Warning Disconnect from Main Supply before Servicing the air conditioner The unit is designed to give a long life operation with minimum maintenance required. However, it should be regularly checked and the following items should be given due attention. Components Air Filters Maintenance Procedure 1. Clean with a vacuum cleaner, or by tapping lightly and then washing in lukewarm water (below 40°C) With neutral soap. Recommended Schedule Every 2 weeks.
Pre-Start Up Maintenance (After Extended Shutdown) - Inspect thoroughly and clean indoor and outdoor units. Clean or replace air filters. Clean condensate drain line. Clean clogged indoor and outdoor coils. Check fan imbalance before operation. Tighten all wiring connections and panels. Check for refrigerant leakage. Most of the parts are accessible by removal of bottom & side panel.
Troubleshooting When any air-conditioner malfunction is noted, immediately switch off the power supply to the unit, and contact the local dealer, if necessary. Some simple troubleshooting tips are given below : FAULT CAUSE 1. Fan does not work 3 minutes after starting • Protection against the frequent starting. Wait 3 or 4 minutes. 2. The air conditioning unit does not work • Power failure or need to replace the fuse. • The power plug is disconnected.
For Cooling Only Models Or Heat Pump Models (Cooling Cycle) Diagnosis By Flow Chart The following chart are efficient checking procedures for troubleshooting when these fan-coil units, are coupled with the condensing units using standard wiring. For dual circuited models, perform the procedures for each circuit.
Insufficient Cooling Insufficient Cooling Compressor Cycling Cycling On Dual Pressure Switch Tripping High Discharge Pressure or Low Suction Pressure Clogged Capillary or Pressure Switch Switch Faulty Running Overcurrent Relay For Compressor Tripping High Voltage or Low Voltage Single-Phase High Discharge Pressure And High Suction Pressure Loose Connections Discharge Gas Thermostat or Internal Thermostat Tripping High Discharge Pressure And Low Suction Pressure Refrigerant Short Charge or Refrig
High Suction Pressure High Suction Pressure Low Evaporator Air Inlet Temperature Excessive Fresh Air Intake Reduce The Fresh Air Intake Insufficient Duct Insulation Reinforce The Duct Insulation Defective Compressor Valve Overcharged Refrigerant Change Or Repair The Compressor Purge The Refrigerant Low Suction Pressure Low Suction Pressure Evaporator Air Flow Restricted Evaporator Air Inlet Temperature Clogged Air Filter Low Clean The Air Filter Restricted Duct Remove The Restriction Low F
For Heat Pump Models By means of pressure readings : Too High A Little High Circuit PROBABLE CAUSE Normal Too Low Data A Little Low PRESSURE High Side Low Side 1. Overcharged with refrigerant. 2. Non-condensable gases in refrigerant circuit (e.g. oil). 3. Obstructed air-intake/discharge. 4. Short circuiting of hot air outdoor unit. 1. Poor compression/no compression (compressor defective.) 2. Check valve stick in open position. 3. Reversing valve leaking. 1. Undercharged with refrigerant. 2.
The most common causes of air conditioner failure to “start" are: a) Voltage not within ±10% of rated voltage. b) Power supply interrupted. c) Control settings improper. d) Air conditioner is disconnected from main power source. e) Fuse blown or circuit breaker off. ii) Diagnosis Of Refrigerant Circuit / Application There might be some cases where the unit starts running but does not perform satisfactory, i.e. insufficient cooling.
Parts List Model : MHDC020AR No 1 2 3 4 5 6 7 8 9 10 11 Description Front panel Drain pan assy. Base panel Valve plate Back panel Coil assy. Compressor 3-way valve (5/8”) 2-way valve (1/4”) Accumulator 4-way valve No 12 13 14 15 16 17 18 19 20 21 22 49 Description Tube (Comp. Suct. To acc. Out ) Check valve assy.
Model : MHDC025AR No 1 2 3 4 5 6 7 8 9 10 11 Description Front panel Drain pan assy. Base panel Valve plate Back panel Coil assy. Compressor 3-way valve (5/8”) 3-way valve (3/8”) Accumulator 4-way valve No 12 13 14 15 16 17 18 19 20 21 22 50 Description Tube (Comp. Suct. To acc. Out ) Cap. tube assy.
Model : MHDC030AR No 1 2 3 4 5 6 7 8 9 10 11 Description Front panel Drain pan assy. Base panel Valve plate Back panel Coil assy. Compressor 3-way valve (5/8”) 3-way valve (3/8”) Accumulator 4-way valve No 12 13 14 15 16 17 18 19 20 21 22 51 Description Tube (Comp. Suct. To acc. Out ) Cap. tube assy.
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