Broan B120DHV Installation & Operation Instructions Download Page 16

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Installation & Operation Instructions

800.558.1711

SERVICE

Symptom

Possible Reason

Troubleshooting Procedure

CAUTION!

TROUBLESHOOTING SHOULD BE PERFORMED BY A QUALIFIED HVAC TECHNICIAN.

Troubleshooting

Troubleshooting Procedure for Control

Related Issues
This method of diagnosis will test the 3 main

components of the control circuit individually to

indicate any potential problems. This is to be used

when the control will not activate the main unit.
1. Detach field control wiring connections from

the terminals on the main unit.

2. Connect the 24V and FAN terminals

together; only the fan should run. Disconnect

the terminals.

3. Connect the 24V and DEHU terminals

together; fan and compressor should run.

Disconnect the terminals.

4. If this test works, the main unit is working

correctly from a control standpoint.

5. Reconnect field control wiring to the terminals

on the main unit.

6. Remove the control panel cover and detach

the field wiring from the control connections.

7. Connect the 24V and FAN terminals together;

only the fan should run. Disconnect the terminals.

8. Connect the 24V and DEHU terminals together;

fan and compressor should run. Disconnect the

terminals.

9. If this test works, then the field control wiring

is ok.

10. If the problem persists, then the control is

most likely faulty.

WARNING!

ELECTRICAL SHOCK HAZARD:

ELECTRICAL POWER MUST BE PRESENT

TO PERFORM SOME TESTS. THESE TESTS

SHOULD BE PERFORMED BY A QUALIFIED

SERVICE PERSON.

Neither fan nor

compressor

running.

Dehumidification

is being called for.

Compressor is

not running.

Dehumidification

is being called for.

Fan is running.

1. Defective compressor

run capacitor.

2. Loose connection in

compressor circuit.

3. Defective compressor

overload.

4. Defective compressor.
5. Defrost thermostat open.

Compressor

cycles on and off.

Dehumidification is

being called for.

1. Low ambient

temperature and/or

humidity causing unit

to cycle through

defrost mode.

2. Defective compressor

overload.

3. Defective compressor.
4. Defrost thermostat

defective.

5. Dirty air filter(s) or air

flow restricted.

6. Defective fan or relay.

1. Dehumidifier unplugged

or no power to outlet.

2. Humidity control set

too high.

3. Loose connection in

internal or control wiring.

4. Defective compressor

relay.

5. Defective control

transformer.

6. Open circuit between

FLOAT terminals.

Summary of Contents for B120DHV

Page 1: ...y Installation Operation Instructions The B98DHV and B120DHV are ventilating dehumidifiers that integrate into the heating and cooling system to provide the ultimate in comfort health and property protection through Dehumidification Fresh Air Ventilation Optional Air Filtration B98DHV B120DHV 800 558 1711 ...

Page 2: ...tallation 9 Fresh Air Ventilation 10 Determine Ventilation Requirements 11 Controls 12 Air Filtration 14 MERV Rating Chart 15 Service 16 Warranty 19 TABLE OF CONTENTS FOR REPAIR TECH SUPPORT 1 800 558 1711 follow prompts Broan is committed to manufacturing quality products To maintain our standards product specifications may change without notice 926 West State Street Hartford WI 53027 www Broan N...

Page 3: ...L IMPROPER INSTALLATION MAY CAUSE PROPERTY DAMAGE OR INJURY INSTALLATION SERVICE AND MAINTENANCE MUST BE PERFORMED BY A QUALIFIED SERVICE TECHNICIAN DEHUMIDIFIER IS HEAVY HANDLE WITH CARE AND FOLLOW INSTALLATION INSTRUCTIONS NEVER OPERATE A UNIT WITH A DAMAGED POWER CORD IF THE POWER CORD IS DAMAGED IT MUST BE REPLACED BY THE MANUFACTURER ITS SERVICE AGENT OR A SIMILARLY QUALIFIED PERSON IN ORDER ...

Page 4: ...hes a 115 VAC electrical outlet with a minimum of a 15 Amp circuit capacity Locate the dehumidifier in an area where field wiring the control low voltage to the unit will be possible It is recommended that a backdraft damper be used in the discharge duct of the Dehumidifier especially when connecting to the supply ducting system The backdraft damper prevents supply air from counter flowing through...

Page 5: ... B C Air Flow Rear View Front View A B Fresh Air Ventilation Duct Fresh air ventilation is optional A 6 diameter duct is attached to the unit The 6 duct should be capped if fresh air is not desired If setting up the unit to provide fresh air ventilation see page 10 Return Air Inlet A 10 diameter duct collar is attached to the unit Supply Air Outlet The back panel of the dehumidifier can be rotated...

Page 6: ...ALLOW THE 24V TERMINAL TO CONTACT THE COM DMPR TERMINALS ON THE DEHUMIDIFIER OR DAMAGE TO THE TRANSFORMER WILL RESULT Electrical Precautions Do not install the control where it may not accurately sense the relative humidity such as near HVAC supply registers near exterior doors on an outside wall near a window or near a water source The screw terminals on the Dehumidifier and the control are label...

Page 7: ...ate is automatically pumped to a remote location when the water level in the pump s reservoir rises to close the float switch The pump also contains a safety float switch The white leads from this switch extend from beneath the pump cover This switch should be installed in series with the field wire that connects to the common lead from the Dehumidifier to the control panel If the pump fails this ...

Page 8: ...onnections is recommended to reduce noise and vibration transmitted to rigid ductwork in the structure Use a minimum 10 diameter round or equivalent rectangular duct for total duct lengths of up to 25 Use a minimum 12 diameter round or equivalent rectangular duct for longer lengths Grills or diffusers on the duct ends must not excessively restrict airflow Effective dehumidification may require tha...

Page 9: ... a backdraft damper If the existing system has multiple returns instead of installing a dedicated return to the Dehumidifier it is possible to select one to disconnect from the existing HVAC system and use it for the dedicated Dehumidifier return Select a return from a central location in the house that is always open to the rest of the structure DO NOT use a return from a room where doors are kep...

Page 10: ...s required It may be necessary to use 8 duct work if additional fresh air is required In cold climates or at times when the dew point is low ventilation can be used to dehumidify the structure making the Dehumidifier capable of year round drying FRESH AIR VENTILATION Outdoor Air 90 F 65 RH Indoor Air 70 F 50 RH Mixed Air Mixed Air 75 F 75 F 65 RH 65 RH Mixed Air 75 F 65 RH Outlet Air 75 F 65 RH Ho...

Page 11: ...VENTILATION Determine Ventilation Requirements The MINIMUM ventilation requirement is calculated using ASHRAE 62 2 2016 Use one or both of the options below to determine your ventilation requirement Follow all local and national building and safety codes Option 2 Calculating Airflow Requirement Using Table 4 1 from ASHRAE 62 2 2016 Table 4 1 from ASHRAE 62 2 2016 Record the required CFM __________...

Page 12: ...4V TERMINAL FROM THE DEHUMIDIFIER TO CONTACT THE COM TERMINAL ON THE DEHUMIDIFIER OR DAMAGE TO THE TRANSFORMERS WILL RESULT Circuit Breaker To prevent damage to the 24 volt control transformer the Dehumidifier comes with a resettable circuit breaker Check wiring for any electrical short and repair before resetting breaker Resetting the circuit breaker without correcting the electrical short may re...

Page 13: ...he accessory to the DMPR OR COM and 24V terminals Between the COM lead and the 24V TERMINAL is a 40VA transformer This low voltage power source powers the relay coils which control the fan and compressors This 24VAC transformer can also be used to power HVAC accessories external to the dehumidifier COM 24VAC Power Transformer Neutral Side FAN Fan Control 24V Transformer High Side DEHU Dehumidifica...

Page 14: ... Remove the filter by gently pulling it straight out of the unit Insert new filter by gently pushing it straight into the unit Make sure the AIR FLOW arrow on the filter is pointing into the unit Step 3 Insert filter door into tabs and swing door closed to lock the latch into place Filter Fresh Air Intake Optional Return Side View Top View Side View Magnetic Strip nal Fresh ake eturn Supply Top Vi...

Page 15: ...ed Legionella microfine fiberglass or 11 60 65 95 Humidifier Dust Better Commercial Buildings synthetic media 12 36 in deep 6 12 pockets Lead Dust 10 50 55 95 Milled Flour Box Filter Rigid Style Cartridge Filters 6 to 12 deep may use lofted or paper media Auto Emissions Hospital Laboratories 9 40 45 90 Welding Fumes 8 30 35 90 3 0 10 0 pm Particle Size Commercial Buildings Pleated Filters Disposab...

Page 16: ...onnect the terminals 8 Connect the 24V and DEHU terminals together fan and compressor should run Disconnect the terminals 9 If this test works then the field control wiring is ok 10 If the problem persists then the control is most likely faulty WARNING WARNING ELECTRICAL SHOCK HAZARD ELECTRICAL POWER MUST BE PRESENT TO PERFORM SOME TESTS THESE TESTS SHOULD BE PERFORMED BY A QUALIFIED SERVICE PERSO...

Page 17: ... or in area of low relative humidity the dehumidifier will produce little to no water 7 Collecting the water removed in a 24 hour period will give a measurement of performance WARNING WARNING ELECTRICAL SHOCK HAZARD ELECTRICAL POWER MUST BE PRESENT TO PERFORM SOME TESTS THESE TESTS SHOULD BE PERFORMED BY A QUALIFIED SERVICE PERSON Fan is not running Dehumidification or fan is being called for 1 Lo...

Page 18: ...t charge weight and refrigerant type Refrigerant Charging SERVICE Symptom Possible Reason Troubleshooting Procedure CAUTION CAUTION TROUBLESHOOTING SHOULD BE PERFORMED BY A QUALIFIED HVAC TECHNICIAN Troubleshooting Continued 1 Verify power to the unit at power outlet 2 Look for short in control wiring 3 Check wire connections at control and unit 4 Reset circuit breaker button on dehumidifier WARNI...

Page 19: ...hanges to a Product or Component that may be required by any codes laws or regulations that may become effective after initial purchase of the Product by Customer Customer Responsibilities As a further condition to obtaining warranty coverage hereunder the Customer must send a valid warranty claim to Broan such that Broan receives such claim prior to the end of the applicable warranty period Broan...

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