Comfort-aire BHD Series Dehumidifier Instruction Manual

Comfort-aire BHD Series Dehumidifier

Product Information

Specifications:

• Brand: Comfort-Aire
• Model: BHD-501
• Type: Dehumidifier
• Number of Models: 129

Product Usage Instructions:

Setup and Installation:
Follow these steps to set up your Comfort-Aire BHD-501 dehumidifier:

1. Choose a location with proper ventilation and at a distance from walls.
2. Plug in the dehumidifier to a power outlet.
3. Adjust the settings according to your preferences using the control panel.

Operating the Dehumidifier
To operate the dehumidifier efficiently, follow these guidelines:

• Set the desired humidity level using the controls.
• Ensure the water collection bucket is properly placed and emptied regularly.
• Clean or replace the air filter as recommended in the manual to maintain optimal performance.

Maintenance and Care
Proper maintenance ensures longevity and performance of your dehumidifier:

• Regularly clean the water collection bucket and the external surfaces.
• Inspect and clean the air filter to prevent blockages.
• Check for any leaks or unusual noises during operation anB address them promptly.

Frequently Asked Questions (FAQ):
Q: How often should I clean the air filter?
A: It is recommended to clean or replace the air filter every 2-3 months depending on usage frequency and air quality.

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PREFACE

This Service Manual provides various service information, including the mechanical and electrical parts. This dehumidifier was manufactured and assembled under the strict quality control procedures.
The refrigerant is charged at the factory. Be sure to read the safety precaution prior to servicing the unit.

SAFETY PRECAUTIONS

• Disconnect the power supply before servicing or replacing any component.
• Do not cut off the grounding prong or alter the plug in any manner.

FEATURES AND DIMENSIONS\

FEATURES

• Quiet operation
• High efficiency
• Adjustable humidistat
• Automatic defrost
• Automatic shut-off
• Bucket-full indicator light
• Easy roll casters
• Removable & large capacity bucket.
• Washable air filter
• Two-speed fan
• Drain hose connection.
• Low temperature operation (BH 0-501 /BHO-651)

DIMENSIONS (mm/in)

SPECIFICATIONS

*NOTE: Specifications are subject to minor change without notice for further improvement.

CONTROL TYPE
Mechanical type

HOW TO OPERATE DEHUMIDIFIER

HOW DOES THE DEHUMIDIFIER WORK?
Moist, humid air is drawn over a cold refrigerated dehumidifying coil. Moisture in the air condenses on this coil and drains into a bucket (or through the bucket into a hose and drain).
Dry, clean air is drawn over the condenser where it is actually heated several degrees and discharged out the rear grill into the room. (See Figure 4)

It is normal tor the surrounding air to become slightly warmer as the dehumidifier operates.
This warming effect further reduces the relative humidity of the surrounding air.

LOCATION FOR THE DEHUMIDIFIER
Allow at least 12 inches of space on all sides of the unit for good air circulation. (See Figure 5)

• The dehumidifier must be operated in an enclosed area to be most effective.
• Close all doors, windows and other outside openings to the room.

Place the dehumidifier in a location that does not restrict air flow into the front grille or out the rear grille.
The operation of dehumidifier in a basement will have little or no effect in drying an adjacent enclosed storage area, such as a closet, unless there is adequate circulation of air in and out of the area.

MICRO SWITCH

The micro switch assembly, which is located on the drain pan of inside unit, automatically shuts off the dehumidifier when the bucket is full (note, the Auto Shut Off lights, to indicate bucket must be emptied). The bucket replaces in its place, the unit again turns itself on.

AUTO DEFROST
When frost builds up on the cooling coils, the unit will automatically cycle off until the frost disappears. The fan continues to run.
NOTE: The unit will not operate satisfactorily if the room temperature is below 65’F(18’C). If the dehumidifier is operated in low temperature conditions frost can form in the evaporator coil and the unit will cycle ON/OFF repeatedly. In this case, please check your room temperature conditions and stop the unit.
NOTE: The low temperature operation feature in the BHD-501 and BHD-651 models will continuously cycle up to a temperature of 42°F(6°C).

HUMIDITY CONTROLLER
Mechanical Type
The humidity control can be set anywhere between Off and Max for normal operation.
If you need more dehumidification, turn the Humidity Control toward Max. If you need less dehumidification, turn the Humidity Control toward Off.
The relative humidity range is from 20% to 80%. (See Figure 6)
Turn the Humidity Control to Off to stop the unit manually.

Electronic Type
The humidity control can be set ‘on’ or 35%-70%
RH(Relative Humidity) for normal operation. (See Figure 7) If you need drier air, press the v> Humidity Control button. If you need moister air, press the o Humidity Control button.
Press the Power button to stop the unit manually.

DRYER (BHD-301)
Dryer is used to prevent capillary blockage from moisture in the refrigerant system and H/E, condenser and evaporator.
Also, dryer is used to remove corrosion of the components.
NOTE: When dryer is replaced, proper injection to capillary is needed. On opening the dryer, it should be welded instantly. The oxidization of dryer inside and all tubes inside after welding can be prevented.

CIRCUIT DIAGRAM

MODEL : BHD-301

MODEL : BHD-501/BHD-651

DISASSEMBLY INSTRUCTIONS

MECHANICAL PARTS
BUCKET AND AIR FILTER

1. Turn the Humidity Control off(Mechanical type) or press the power button off. (Electronic type)
2. Disconnect the power supply.
3. Remove the bucket. (See Figure 9)
4. Pull out the air filter. (See Figure 10)

FRONT CASE AND REAR GRILLE

1. Remove 2 screws which fasten the front grille.
2. Pull the front grille forward and upward. (See Figure 11)
3. Remove 6 screws that secure the rear grille.
4. Remove the rear grille. (See Figure 12)

CABINET AND CONTROL BOX

1. Remove the Bucket, the Air filter and Front grille according to the procedure above.
2. Remove 1 screws that fasten Control box. (See Figure 13)
3. Remove 9 screws on all sides of the cabinet.
4. Lift the Cabinet from the base.(See Figure 13)
5. Remove a screw fasten the earth wire on the inside of control box.
6. Remove 1 screw that fasten control box and unhook control box from hook on the shroud. (See Figure 14)

CONTROL PARTS
POWER CORD ASSEMBLY

1. After opening the control box, remove the screw that holds the ground wire. (See Figure 15)
2. Disconnect the remaining leads of the power cord from the PWB(PCB) ASSEMBLY, MAIN, then remove it from the control box.

SENSOR ASSEMBLY

1. Disconnect the sensor assembly from the PWB(PCB) ASSEMBLY, MAIN.
2. Remove the screw which fastens the humidity sensor. (See Figure 16)
3. Remove the thermistor from the holder. (See Figure 16)
4. Disconnect the switch wires from the micro switch assembly. (See Figure 16)

PWB(PCB) ASSEMBLY, MAIN

1. Disconnect all leads of the motor and the compressor from PWB(PCB) ASSEMBLY, MAIN.
2. Remove the screw which fastens the PWB(PCB) ASSEMBLY, MAIN and pull it out after unhooking from 2 rectangular holes of the control box (lower). (See Figure 17)

CAPACITOR (Except BHD-301)

1. Remove the screw that fastens the capacitor. (See Figure 17)
2. Disconnect all leads from the capacitor and then remove it from control box.

MICRO SWITCH ASSEMBLY

1. Turn the nut counterclockwise and pull out the micro switch from the drain pan. (See Figure 18)

COIL ASSEMBLY, SOLENOID (BHD-501, BHD-651)

1. Disconnect the housing of the COIL ASSEMBLY, SOLENOID from the PCB(PWB) ASSEMBLY, MAIN.
2. Remove the screw that fastens the COIL ASSEMBLY, SOLENOID. (See Figure 19)
3. Pull it out upwards.

CONTROL PANEL
CONTROL PANEL – Mechanical Type (BHD-301)

1. Disconnect housing and all leads of the rocker switch, SWITCH ASSEMBLY, ROTARY and PWB(PCB) ASSEMBLY, DISPLAY from PWB(PCB) ASSEMBLY, MAIN (3.1.3)
2. Pull out the knob assembly.
3. Remove the nut which fastens the SWITCH ASSEMBLY, ROTARY.
4. Remove the knob of the rotary switch by pulling it upward.
5. Pull out the rocker switch by pushing the hooks on the both sides of rocker switch.
6. Pull out the PWB(PCB) ASSEMBLY, DISPLAY alter turning over both hooks of the display cover.

CONTROL PANEL- Electronic Type (BH D-501, BHD-651)

1. Disconnect the housing of the PWB(PCB) ASSEMBLY, DISPLAY from PWB(PCB) ASSEMBLY, MAIN (3.1.3).
2. Remove 6 screws that secure the PWB(PCB) ASSEMBLY, DISPLAY to the display cover.

FAN AND MOTOR

1. Turn the nut left and full out the Fan by hands carefully.
2. Remove 2 screws that fasten Heat Exchange.
3. Lift the H/E and open the H/E around 45 degree clockwise carefully. (See Figure 22)
4. Unfasten 3 screws that secure the Motor and earth wire. (See Figure 23)
5. Remove the Motor.

SHROUD AND DRAIN PAN

1. Discharge the refrigerant by using a refrigerant Recovery System.
2. After purging the unit completely, unbrace the Discharge and the Suction tube connected compressor carefully.
3. Remove 2 screws that fasten the H/E.
4. Unfasten 2 screws that secure the shroud on the sides and then lift shroud from the drain pan. (See Figure 24)
5. Unfasten 2 screws that secure the drain pan to base pan. (See Figure 25)
6. Pull the drain pan backward then take it up from the base. (See Figure 25)

REFRIGERATING CYCLE
CONDENSER, EVAPORATOR AND CAPILLARY TUBE

1. Remove the insulation on the Heater/Evaporator (H/E) assembly
2. Pierce the pinch-off tube to discharge the refrigerant, using a refrigerant recovery system.
3. After discharging the refrigerant completely, remove 2 screws between the housing assembly and the H/E. (See Figure 26)
4. Lift the H/E and open the H/E around 45 degree counterclockwise carefully.
5. Unbraze each of interconnecting tubes of the evaporator and condenser carefully.
6. Remove the H/E assembly from the orifice. (See Figure 27)
7. Unbraze the capillary tube at the connections of the condenser and evaporator. (See Figure 28)
8. Remove 4 screws between the condenser and evaporator. (See Figure 28)

PTC OR OVERLOAD PROTECTOR (OLP) FOR RECIPROCATING COMPRESSOR (BHD-301)

1. Discharge the refrigerant by using a refrigerant  Recovery System.
2. After purging the unit completely, unbraze the suction and discharge tubes at the compressor connections.
3. Remove the screw or nut which fastens the terminal cover
4. Disconnect the lead wire from the overload protector or PTC assembly.
5. Remove the overload protector(OLP) or PTC assembly. (See Figure 29)

COMPRESSOR

1. Discharge the refrigerant by using a refrigerant  Recovery System.
2. After purging the unit completely, unbraze the suction and discharge tubes at the compressor connections.
3. Remove the nuts and washers which fasten the compressor. (See Figure 30)
4. Remove the compressor. (See Figure 30)

3.4 HOW TO REPLACE THE REFRIGERATION SYSTEM

1. When replacing a refrigeration component, be sure to discharge the refrigerant system by using a refrigerant recovery system.

2. After discharging the unit completely, remove the desired component, and unbraze the pinch-off tubes.

3. Solder service valves into the pinch-off tube ports, leaving the valves open.

4. Solder the pinch-off tubes with service valves.

5. After doing the above procedures, the valve must be closed and left in place on the system for any subsequent procedures.

6. Evacuate as follows.

7. Connect the vacuum pump, as illustrated in Figure 31A.

8. Start the vacuum pump, slowly open manifold valves A and B two full turns counterclockwise and leave the valves open.
   The vacuum pump is now pulling through valves A and B to valve C by means of the manifold and entire system.
   If high vacuum equipment is used, just crack valves A and B for a few minutes, then open slowly with the two full turns counterclockwise. This will keep oil from foaming and being drawn into the vacuum pump.

9. Operate the vacuum pump for 20 to 30 minutes, until 600 microns of vacuum are obtained. Close valves A and B, and observe vacuum gauge for a few minutes. A rise in pressure would
   indicate a possible leak or moisture remaining in the system. With valves A and B closed, stop the vacuum pump.

10. Remove the hose from the vacuum pump and place it on the charging cylinder. See Figure 31 B. Open valve C.

11. Discharge the line at the manifold connection.

12. The system is now ready for final charging.

13. Recharge as follows:

14. Refrigeration cycle systems are charged from the High-side. If the total charge cannot be put in the High-side, the balance will be put in the suction line through the access valve which you installed as the system was opened.

15. Connect the charging cylinder as shown in Figure 31B. With valve C open, discharge the hose at the manifold connection.

16. Open valve A and allow the proper charge to enter the system. Valve B is still closed.

17. If more charge is required, the high-side will not take it. Close valve A.

18. With the unit running, open valve B and add the balance of the charge.

    * Do not add the liquid refrigerant to the Low­side.
    * Watch the Low-side gauge; allow pressure to rise to 30 lbs.
    * Turn off valve Band allow pressure to drop.
    *  Repeat steps B and C until the balance of the charge is in the system.
  6. When satisfied the unit is operating correctly, use the pinch-off tool with the unit still running and clamp on to the pinch-off tube. Using a tube cutter, cut the pinch-off tube about 2 inches from the pinch-off tool. Use sil-fos solder and solder pinch-off tube closed. Turn off the unit, allow it to set for a while, and then test the leakage of the pinch-off connection.

NOTE: REFRIGERANT R134a IS USED IN SOME MODELS.
CHECK THE SPECIFICATION LABEL ON THE CABINET.

• When discharging refrigerant R134a, purging instrument should be used only for R134a, without mixing that of refrigerant R22.
• When checking the leakage of refrigerant R134a, leakage test tool should be used only for R134a.
• The pump for discharging should be high efficiency. Final discharging value must be managed below 0.5 Torr.
• Maximum water should be less than 150mg in the cycle­all tubes and H/E assembly-system.
• If water quantity is over 150mg, it causes acid or corrosion in the cycle system and the capillary tube to be clogged by water and harmful materials.
• Models charged with refrigerant R 134a should be used dryer to prevent water from overflowing.

Equipment needed: Vacuum pump, charging cylinder, manifold gauge, brazing equipment. pinch-off tool capable of making a vapor-proof seal, leak detector, tubing cutter, hand tools to remove components, service valve.

TROUBLESHOOTING GUIDE

EXPLODED VIEWS

MODEL: BHD-301

MODEL: BHD-501

MODEL: BHD-651

REPLACEMENT PARTS LIST

MODEL: BHD-301

MODEL: BHD-501

MODEL: BHD-651

Specifications and performance data subject to change without notice.
HEAT CONTROLLER, INC.
1900 WELLWORTH AVENUE• JACKSON, MICHIGAN 49203 THE QUALITY LEADER IN CONDITIONING AIR

References

• Repair Your Grill: Shop Replacement Parts for 24,880 Models

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