Fri, Nov 15, 2019
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PoolPak® FAQ

Q. Can I use my PoolPak® in a salt water pool?

A. Yes. PoolPak® units work with salt water pools. In addition to monitoring the salt concentration, regular chlorine testing is still required as salt systems do not reduce the level of chloramines that can be produced. Regularly scheduled maintenance of the salt water system to ensure proper operation should be encouraged.

Q. What is the recommended differential pressure between the pool area and the surrounding spaces?

A. A slight negative pressure of 0.05 to 0.15 in. of water column is recommended in the pool area relative to surrounding spaces to prevent moisture and chlorine odors from migrating to other areas of the building. PoolPak® supply and return airflow are set up at the factory to maintain the recommended differential pressure.

Q. By using a pool cover are we then allowed to downsize my PoolPak® unit?

A. No. The use of a pool cover does not affect the size of the PoolPak® required since it is sized for the load for when the pool is in use.

Q. Is the return grille located near the surface recommended for indoor pools?

A. It has been found that chloramine-saturated air blankets the pool surface and often does not adequately re-circulate through the dehumidification system. By positioning return(s) near the surface of the pool and drawing off the chloramine layer while not creating uncomfortable air currents, indoor air quality can be greatly improved.

Q. What is the recommended chloramine level for my pool?

A. The Pool-Spa Operator’s Handbook recommends that the chloramine levels not exceed 0.2 ppm. The corrosion process caused by the chloramines in the air is accelerated when the chloramines level rises above 0.2 ppm

Q. Should air be directed over pool surface?

A. Air movement at the water surface increases the evaporation rate. The U.S. Olympic Committee (USOC) does however recommend some air movement at the water surface to break up the chloramine layer above the pool helping swimmers breathe.

Q. What is a cold wall sensor and what does it do?

A. One of the more significant control features of the PoolPak® is its ability to prevent condensate from forming on certain walls of the natatorium. This benefit is accomplished by mounting a temperature sensor in the natatorium on the inside of a wall that will encounter the lowest natatorium temperatures. This sensor is typically mounted on the inside of a window frame door frame of a north-facing wall or a skylight. As the outdoor temperature drops, the interior temperature drops. This condition is monitored by the wall sensor. When the cold surface temperature approaches the condensing temperature (or dewpoint) of the air in the natatorium, the PoolPak®’s controls automatically reset the humidity set-point downward in order to lower the dewpoint of the air to prevent condensation from forming on the natatorium walls.

Q. What is SCC (stress corrosion cracking) and is it true that SCC can only occur with stainless steel?

A. Stress corrosion cracking causes microscopic cracks in steel, which can propagate quickly and cause immediate failure. Evidence suggests that it can only affect stainless steel under tensile stress with structural components such as fasteners, rods or wires that support a load or from which a load is suspended. Good design characteristic will protect you from catastrophic SCC failure.

Q. What is used in PoolPak® to scrub the nasty chlorine compound?

A. PoolPak® dehumidification system does not or will not eliminate the harmful chlorine compounds that cause the chlorine odor and metal corrosion. Only a comprehensive pool water chemistry program and continuous monitoring will keep your pool crystal clear and odor free.

Q. What do I do when more cooling is required than the unit can provide?

A. If the PoolPak® selected has a sensible cooling capacity close to the required sensible cooling load, a unit one size larger would be the most cost effective solution. If the cooling requirement is significantly more than the selected PoolPak® supplies, the difference can be made up by a separate cooling circuit added either to the PoolPak® or in the duct. In some cases, an evaporator with a higher sensible heat ratio can be used, preventing the need to upsize your PoolPak®.

Q. Can we forego the pool water heater since pool water heating is provided by the unit?

A. No. PoolPak® control strategy gives air heating first priority and water second. Running a heat pump to heat pool water is much less efficient and cost effective than using a boiler.

Q. Why is the outside air introduced into the dehumidification system after the evaporator coil?

A. There are a couple of reasons as to why OA is introduced into the dehumidification system after the evaporator coil. Reason #1: Cold outdoor air may condense the return air at undesirable places in the system or ductwork. Reason #2: The variability of the outdoor air will influence the design and performance of the evaporator coil. When colder outdoor air mixes with the return air from a pool room, it lowers the mixed air conditions that flow over the evaporator coil. This lower condition reduces the capacity of the system. To eliminate these issues, a typical design is to introduce the outdoor air between the evaporator and hot gas reheat coil.

Q. What are UV Pool water treatment systems and how do they work?

A. UV systems are installed directly in the recirculation line of the pool. Over this short interval, the pool water is exposed to ultraviolet (UV) light at a certain dosage that decomposes contaminants. UV light targets certain chemical components of the wastes and microorganisms created by bathers to cause this decomposition. However, as great as UV systems can be at cleaning up the pool, there are a couple things to keep in mind. UV systems do not replace the need for a chlorine residual. UV systems must be properly designed and sized depending on the pool size and bather load. UV systems require regularly scheduled maintenance to ensure proper operation. For more details on UV systems, please view this article.

Q. What are Ozone Pool water treatment systems and how do they work?

A. Ozone systems are typically installed as a 10-25% bypass to the main recirculation line of the pool. The ozone system relies on a separate module to generate ozone and then injects this ozone into the bypass line. Most systems contain mixing chambers or contact tanks to allow ozone to fully react with pool water. Ozone reacts with contaminants from bathers by a chemical process known as oxidation. Chemical components of bather wastes are decomposed to their inert elements. Keep in mind, ozone systems do not eliminate the need for a chlorine residual. Similar to UV systems, ozone systems must also be designed and sized to handle a certain pool size and bather load. Ozone systems also require regular maintenance and care to ensure proper functioning and safety devices are in working order. For more details on Ozone systems, please view this article.

Q. What is a purge feature and why do I need it?

A. The PoolPak® has a purge cycle to fully ventilate the natatorium at the airflow (CFM) specified for the unit’s supply fan. The feature is typically used to facilitate the pool shocking process by purging nitrogen from the space. It has been reported that using a fan to sweep off the blanket of nitrogen gas that forms over the pool’s surface during shocking has assisted in the shocking process.

Q. How does my PoolPak® handle the additional spectator load for when a swim meets is held?

A. An event mode can be set up in your PoolPak® unit to change the ventilation air quantity to meet the demands of an event or situation where additional outside air is needed.