Dectron ht 800 service manual

Lack of such connection and the necessary adjustments below should be temporary. The controller will return to normal approximately 35 seconds after the last button is pushed. Your HT controller comes pre-programmed from the factory for the conditions determined at time of sale.

If conditions have changed so that it is necessary to change whether or not the unit will have an auxiliary pool water heater connected see Installation - Wiring - Control Signals , or whether or not the unit will have an outdoor air tempera- ture sensor connected see Installation - Wiring - Control Signals , or whether or not the unit has an airflow sensor, follow these steps.

Choose one of the display codes according to the chart. May 53 Data subject to change without notice. This page is intentionally left blank. Apply electric power If the disconnect switch for the remote condenser is not already ON, turn it ON now. This starts the compressor crankcase heaters. Start blower On some units, the blower runs whenever electric power is applied to the unit. On other units, it will be necessary to press on the controller display until illuminates.

The blower will start after a short delay. If the blower does not turn the proper direction, a qualified person should discon- nect electric power and interchange any two of the branch circuit wires at the DRY-O-TRON. Do not move any factory installed wires. Check Air Distribution Be sure the air flow rate is correct before proceeding. Be sure that the air flow at each diffuser is correct.

This is necessary for the compressor crankcase heater function. For other units, turn ON the compressor emergency switch. May 55 Data subject to change without notice. This energy recycling dehumidification system has been completely tested under design conditions at the factory. Start-up must be performed by a qualified factory trained service and installation technician. Once start-up is completed, all portions of the Start-up Report and Warranty Registration form must be completely filled in and a copy must be sent to the Dectron representative or to the Dectron factory in order to register and validate the warranty.

Do NOT turn on the electric power unless the power supply voltage matches that specified on the unit nameplate. Be certain that there is no construction dust in the space or in the return duct.

The numerical value in the screen is then the value of the indicated sensor. Indoor temperature is displayed by default. Displayed variable is present indoor relative humidity. Displayed variable is present spa inlet water temperature.

Displayed variable is present pool inlet water temperature. May 57 Data subject to change without notice. To access the secondary sensors, press and at the same time, and hold them until illuminates. Use the table below to interpret the display. Displayed variable is the temperature of the air leaving the evaporator. Displayed variable is spa outlet water temperature.

Displayed variable is pool outlet water temperature. Some primary sensors have set points associated with them. Open navigation menu.

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Uploaded by Sunil Pawar. Did you find this document useful? Is this content inappropriate? Report this Document. Flag for inappropriate content. Download now. Related titles. Carousel Previous Carousel Next. Jump to Page. Search inside document. If the blower does not turn the proper direction, a qualified person should discon- nect electric power and interchange any two of the branch circuit wires at the DRY-O-TRON input lugs.

John Juquen. Sivaneshen Jeevakrishnan. Nend Kjhlk. Arputharaj Maria Louis. Anonymous ajQr0qX. Arlex Ricardo Guillen Petit. Alfredo Enriquez. Nikola Lanjak. Denise Koh Chin Hui. Fareeha A K. Manual De Utilizare. Replace HT controller as soon as possible. The HT controller will no longer have authority over the system. If desired, the HT controller can be removed and the emergency cycle will continue. After the emergency jumper is removed, there will be a second delay before anything happens.

The blower will run continuously even if it was originally OFF. This cycle will continue for 48 hours, allowing time for the replacement of the HT During this cycle the blower motor will be protected by the overload. The compressor will be protected by the overload and by pressure and temperature limits as Data subject to change without notice.

Set point parameters are outside the acceptable limits. Code 41 Humidity set point out of range Code 42 Pool-water temperature set point out of range Code 43 Spa-water temperature set point out of range 1. Code 44 Ventilation changeover temperature set point out of range Code 45 System mode out of range 1. No value for this parameter. Code 96 No demand. Code 97 Ventilation low outdoor temperature Code 00 Compressor will start Demand for space heating.

This code will be displayed three times prior to a Code 3. This code will be displayed three times prior to a code 4. Auto reset is delayed. No reason for compressor to operate. Unit is in ventilation mode. All parameters are fine. Compressor is ready to start. Pool or spa solenoid valve is stuck in other position. Pool or spa water temperature sensor is out of calibration.

Inadequate water flow 5. Spa heat priority, and unit cannot keep up with spa demand. Pool or spa is larger or warmer than specified. See configuration and calibration page of owners manual for pool and spa water sensor calibration. Check performance of pump or be sure water by pass valve is not wide open. Pool or Spa water is too warm Data subject to change without notice. Low condenser pressure Fouled heat exchanger Compressor not responding to demand.

Pool or spa temperature set point is too high. Incorrect ORI valve water heating intensity setting 3. Room temperature too high 4. Room relative humidity too high 5. Water heating solenoid valve stuck in heating position. See HT Diagnostics Code 3 for adjusting method. Correct as necessary. Eliminate source of air accumulation. See HT Diagnostics Code 3 for setting method. Unit not cooling 1. Return air sensor is out of calibration This sensor is a combination return air and relative humidity sensor.

See configuration and calibration page of service manual for return air sensor calibration. This could occur on abnormally hot days, and prevents the unit from tripping on high pressure.

To check the valve adjustment. Close the isolation valves for the outdoor condenser. The head pressure should rise to the setting of the by pass valve. Adjust the valve if necessary clockwise to increase pressure, counter-clockwise to decrease pressure. Closed isolation valves for outdoor condenser 5. Room load exceeds the cooling capacity of the unit. No demand 2.

Anti-short-cycle timer prevents start-up for 3 minutes. Compressor overload is turned off or has tripped three phase units only.

Compressor thermal protector is open. Open water-pressure switch circuit 6. Loose control or power wiring 7. Compressor crankcase full of liquid refrigerant 9. Low voltage may cause failure to start Long inadequately sized branch circuit conductors may cause low voltage at inrush.

Check for water flow. Check pressure switch adjustment. Consult Dectron for use of hard-start kit single phase units only. Defective start capacitor single phase units only Defective capacitor relay single phase units only Defective compressor 1. Incorrect duct design can produce stratification of room air. Incorrect duct design can cause improper evaporator air velocity.

Incorrect duct design can reduce air flow below operating range. Incorrect blower speed can cause improper total air flow. Dirty air filters can seriously reduce the total air flow. Room air temperature being too high can reduce the dehumidification effect. Reduced pool water flow rate can cause excessive condenser pressure. Insufficient refrigerant can reduce the refrigeration effect. Excessive length of tube connecting to remote condenser if so equipped can cause refrigerant undercharge.

Excessive amounts of refrigerant can reduce the refrigeration effect. Air-side clogging of the air reheat heat exchanger can reduce total air flow and heat transfer. Reduced heat transfer of a remote aircooled condenser if so equipped can cause excessive condenser pressure.

Non-condensable gases in the refrigeration system can reduce the refrigeration effect. Closed manual shut-off valves can reduce the refrigeration effect.

Always filter any outdoor air brought into the unit. Do not locate the return grille near a spa or hot tub. Clogged filter-driers can reduce the refrigeration effect. Set point too low 2. Excessive outdoor-air intake 3. Room temperature too high Supply air temperature too low 1. Set point too high 2. Outdoor condenser dirty or fan s not operating 4. Auxiliary duct heater ON with no heating demand 5. Air-conditioning diverting valve stuck 1. Unit is in air-conditioning mode 2.

Assure fan operation. Verify operation of air-conditioning diverting valve see verification instructions for the 3-way valve above. Allow at least 10 hours for it to heat up before initial start-up. Expansion valve incorrectly adjusted. Liquid flooding at the compressor is a very serious problem that will quickly lead to a compressor failure. There are only a limited number of ways in which liquid refrigerant can return to the compressor.

The thermal expansion valve is misadjusted or defective and is not metering the refrigerant properly. The pumpdown valve on units so equipped is leaking during the off cycle allowing the evaporator to accumulate liquid. Oil failures caused by this problem will only occur inthe first 5 minutes after the compressor starts.

Assure that proper steps have been taken to assure oil return. See installation diagram. Low condenser pressure 1. Room air temperature too low 2. Room humidity too low 3. High suction pressure 4. ORI valve water heating intensity incorrectly set 5. Insufficient refrigerant in system 1. Room air temperature above normal can cause increased load on the evaporator. Room relative humidity above normal can cause increased load on the evaporator.

A closed evaporator- by pass damper can cause high air velocities in the evaporator. Improper duct design can cause high air velocities in the evaporator. Correct duct design as necessary. Excessive total air flow can cause high air velocities in the evaporator.

A worn or damaged compressor may produce less refrigerant pumping. Evaporator icing Excessive noise Unit runs continuously no damage will result 1. Dirty air filters reduce air flow. Low room temperature 3. Low air flow 4. Low refrigerant charge 5. Improper duct design 1. Lack of unit support isolators allows vibration to be transmitted to floors, etc. Lack of duct isolators allows vibration to be transmitted to the ducts.

Improperly closed access panels can produce a whistling noise as air leaks into the cabinet. An incorrectly set expansion valve can cause liquid refrigerant flood back to the compressor, with accompanying noise. Liquid refrigerant in crankcase can cause excessive noise on startup 7. Failure of a blower bearing can produce a rumbling noise.

Set points out of range 2. Heavy pool use can cause the water evaporation rate to increase dramatically. A defective liquid line solenoid valve can prevent pump down mode if so equipped from terminating.

Allow at least 10 hours for the crankcase heater to warm up before initial startup. Replace as necessary. These types of pools do not maintain an effective chlorine level for very long.