SPD Indoor Pool Dehumidifier For Humidity Control.

SPD swimming pool dehumidifier for indoor pool rooms.

SPD Dehumidifier for Swimming Pool; Features:

SPD Series swimming pool dehumidifier are ducted dehumidifier which can be easily suspended or wall mount in indoor swimming pool area. This unit is very effective machine for indoor swimming pool humidity control. Unit provided with wall mount LCD controller which connected to unit with help of special socket. Casing of unit made of steel and painted with powder coating. SPD indoor pool dehumidifier has very compact design. At inlet a filter is proved for cleaning of air. This filter can be easily roomed and clean. Unit equipped with rotary compressor and exhaust fan. SPD indoor pool room dehumidifier can be easily ceiling suspended with help of four fixing brackets provided at its four corners. It is light weighted and easy to install. SPD series available for small residential pool to big commercial pool. SPD-240L is best commercial pool dehumidification systems.

commercial pool dehumidification systems

How SPD Indoor pool Room Dehumidifier Works?

indoor swimming pool humidity controlThe SPD dehumidifier for indoor pool rooms uses a refrigeration system similar to air conditioners to remove heat and moisture from incoming air, and add heat to the air that is discharged. Hot, high pressure refrigerant gas is routed from the compressor to the condenser coil (See below Figure). The refrigerant is cooled and condensed by giving up its heat to the air that is about to be discharged from the unit. The refrigerant liquid then passes through a strainer and capillary tubing which causes the refrigerant pressure and temperature to drop. It next enters the evaporator coil where it absorbs heat from the incoming air and evaporates. The evaporator operates in a flooded condition, which means that all the evaporator tubes contain liquid refrigerant during normal operation. A flooded evaporator should

maintain nearly constant pressure and temperature across the entire coil, from inlet to outlet. The mixture of gas and liquid refrigerant enter the accumulator after leaving the evaporator coil. The accumulator prevents any liquid refrigerant from reaching the compressor. The compressor evacuates the cool refrigerant gas from the accumulator and compresses it to a high pressure and temperature.

Controller of SPD Indoor pool room dehumidifier.

Controller of commercial pool dehumidification systemsThe SPD dehumidifier features a built-in humidistat control as well as the ability to wire a remote mounted control to the unit. The control used to operate the unit should be located in an area where the control can accurately sense the humidity of the area where humidity control is desired. If the SPD dehumidifier is located in the area where humidity control is desired, consider using the built-in control. Adjust the humidity control so that the unit maintains the desired level of humidity. If the SPD dehumidifier is located outside of the area where humidity control is desired, consider using a remote wired humidity controller that is located in the area where humidity control is desired. Failure to do so may cause the unit to sense the humidity from the wrong area.

Installation of SPD Dehumidifier for indoor pool room.

SPD series unit can be installed in five to six different ways on basis how it connected to HVAC system or not connected to HVAC system. There are following types of installations:

MAIN RETURN TO MAIN RETURN: In this configuration SPD unit connected in parallel with main return duct. Intake is from return and dry air discharge is also to return duct.

MAIN RETURN TO MAIN SUPPLY: In this configuration SPD connected in parallel with AC unit. Intake of air is from main return duct and discharge of dry air into main supply duct. In this configuration need to install backdraft damper at discharge of SPD to avoid backdraft when dehumidifier is off and AC is working.

dehumidifier installation for pool room humidity control

DEDICATED RETURN TO MAIN SUPPLY: In this configurations use when we like to dehumidify specifica area of facility. Unit take intake from dedicated return from dat specific area of facility and discharge dry air into main supply duct. Here again need to install backdraft damper at discharge of SPD unit.

DEDICATED RETURN TO MAIN RETURN: This configuration is similar to previous one except discharge of dry air is in to main return duct in stead of main supply duct.

UNDUCTED OR DEDICATED SUPPLY & DISCHARGE: This configuration recommended when humidity needs to reduce in closed room. In such case  if room is small unit can be installed without any ducting. If room is big then it is recommended to do ducting for inlet and outlet.

Other methods of ducting with fresh air or with forced air HAVC are as follow:


Fresh air may be brought into the structure by connecting an insulated duct from outside the structure to a tee located in the inlet duct of the SPD dehumidifier. Advantages of this form of ventilation include

  • Outside air is filtered before entering the building.
  • Outside air will be dehumidified before entering if the SPD dehumidifier is running in dehumidification mode.
  • Drawing air from outside and blowing inside aids in slightly pressurizing the structure. This helps prevent dirty and humid air from entering elsewhere. It also reduces the potential for carcinogenic radon gas to enter and provides a small amount of make-up air for open combustion and exhaust devices like the clothes drier, fireplace, and water heater.
  • Exhaust fans are recommended in the bath rooms and Kitchen. In cold climates or areas where the outdoor dew point is low at times, ventilation can be used to dehumidify the structure, making the SPD dehumidifier capable of year-round drying. This is accomplished by bringing the dry, low dew point air into the structure during these times. This approach is often more economical than running the dehumidifier to remove excess moisture from the structure. In cold climates, adequately ventilating is critical to reduce the inside moisture content and avoid moisture accumulating in the wall cavities.

TIP: if your house experiences condensation on the interior surface of the windows during the winter, increasing the amount of ventilation will often solve the problem. Large quantities of outside air will impact SPD indoor pool dehumidification systems performance positively or negatively, depending upon the inside and outside air conditions. The outside air duct should be connected to the front of the unit. With a standard tee, the amount of outside air can be restricted with a blade damper.

Installation in a Basement or Crawlspace with an existing forced Air HVAC system.

Basement Installation: Install a separate return for the SPD dehumidifier in a central area of the structure. Duct the other side of the tee to the air supply of the existing HVAC system with a back draft damper.Dehumidifier for indoor pool room to reduce humdityCrawlspace Installation: Install a separate return for the SPD dehumidifier in a central area of the structure. Duct the other side of the tee to the air supply of the existing HVAC system with a back draft damper.

Instead of installing a separate return to the SPD dehumidifier for pool room humidity control, and if the existing system has multiple returns, it is possible to select one to disconnect from the existing forced air system and use it for the dedicated SPD dehumidifier return. Always select a return from a central location in the structure in an area that is always open to the rest of the structure. Do not use a return from a room that may have its door closed much of the time or, alternatively, install a separate return from the open part of the house.

Installation in an Attic with an existing forced air HVAC system.

When installing the SPD dehumidifier above a finished area or where water leakage could cause damage, use a secondary drain pan with an overflow interrupter switch. The preferred method of installation is to create a separate return for the SPD dehumidifier in a central area of the structure. Duct the supply of the SPD dehumidifier to the air supply of the existing HVAC system.Dehumidifier for indoor swimming pool humidity control

Installation in a Structure with no existing forced air HVAC system.

When installing the SPD dehumidifier in a structure that does not have a forced air HVAC system, a single return for the SPD dehumidifier should be installed in central open area of the structure. DO NOT locate the return in a bathroom or a kitchen. The supplies of the SPD dehumidifier should be located in the remote areas of the structure (such as bedrooms, den, etc.). By ducting this way, the air inside the structure will circulate through the SPD dehumidifier to be filtered and dehumidified.

Maintenance of SPD pool room humidity controller.

The SPD dehumidifier is equipped with a G4 filter. This filter should be checked every three months. Operating the unit with a dirty filter will reduce dehumidifier capacity and efficiency and may cause the compressor to cycle off and on unnecessarily on the defrost control. DO NOT operate the unit without a filter or with a less effective filter. Operating the unit without a filter or with a less effective filter may cause internal damage to the unit and invalidate the product warranty. To replace the filter, remove the filter door from one of the sides of the SPD dehumidifier by pushing the snap button in and gently pulling to door away from the body of the unit, then pulling up to disengage the door flange from the slot, removing the door. Remove the filter by gently pulling straight out of the unit. Insert new filter in the same manner by pushing it gently straight into the unit. Replace filter door by inserting the bottom tab into the slot, aligning the door and pushing it gently against the unit until the snap button secures the door.