Aprilaire 800 steam humidifier manual

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Safety Cautions. Materials List. Installation Instructions. Start-up Procedure. Operating Modes.. Shut Down Procedure.

Display Panel. Read this manual before installing. This product must be installed by qualified HVAC and electrical contractors and in compliance with local, state, federal, and governing codes. Improper installation can cause property damage, severe personal injury, or death as a result of electric shock, burns, or fire. Read this manual before performing service or maintenance procedures on any part of the system.

Failure to follow all cautions and instructions could produce the hazardous situations described, resulting in property damage, personal injury, or death. Failure to follow the instructions in this manual can cause moisture to accumulate, which can cause damage to structure and furnishings.

This steam humidification system has extremely hot surfaces. Discharged steam is not visible. Contact with hot surfaces, discharged hot water, or air into which steam has been discharged can cause severe personal injury. To avoid severe burns, follow procedures in this manual when performing service or maintenance procedures on any part of the system.

Disconnect electrical power before installing supply wiring or performing service or maintenance procedures on any part of the humidification system. Failure to disconnect electrical power could result in fire, electrical shock, and other hazardous conditions. These hazardous conditions could cause property damage, personal injury, or death.

Contact with energized circuits can cause property damage, severe personal injury, or death as a result of electrical shock or fire. Do not remove access panels unless electrical power is disconnected. Follow the shutdown procedure in this manual before performing service or maintenance procedures on any part of the system. If the humidifier starts up responding to a call for humidity during maintenance, severe injury or death from electrical shock could occur.

Follow the procedures in this manual before performing service or maintenance procedures on this humidifier. Sharp edges may cause serious injury from cuts. Use care when cutting plenum openings and handling ductwork. Do not set humidity higher than recommended. Condensation may cause damage to structure and furnishings. See Figure 1 for representation of fill and drain. The blower activation function on the ADHC allows the control to turn on the HVAC system blower to maintain the proper RH level even when the furnace or air handler is in stand-by mode..

See ADHC installation manual.. Humidity can be distributed directly into the living space via the Fan Pack.. When the Model 65 Manual Digital Humidistat detects RH below the set point, the humidifier energizes the electrodes to provide steam via the steam manifold at the bottom of the Fan Pack..

Steam is dispersed by the fan located behind the grille above the steam manifold.. The fan will operate for two minutes after the call for humidity ends, to disperse any residual steam.. See the ADMC installation and operating manual for details.. This humidifier is able to produce steam at various capacities depending on the voltage and current applied.. The unit can be wired to use an input voltage of , or Volts and input amperage can be set to Configure the unit appropriately for the application see Table 1 for capacity specifications..

Variation is found among water samples but generally the higher the mineral content, the higher the conductivity.. The humidifier makes steam when plumbed to low-conductivity water but it takes longer to reach nominal current..

Two canisters are available for use with the Steam Humidifier.. If the Steam Humidifier has a yellow Steam light in the first two weeks of running with a new canister, the Steam Humidifier is taking a long time to reach its nominal current; changing to the Model 80LC canister will prevent this from happening in the future..

The Model 80LC should not be used with softened water.. If the Steam Humidifier is draining too frequently, the water conductivity is too high; changing to the Model 80 canister will reduce the drain frequency.. As water in the canister boils and turns into steam, minerals are left behind..

Minerals remaining in solution increase the conductivity of the water.. Minerals also deposit onto the submerged portions of the electrodes rendering those areas ineffective..

As this occurs, the level of water in the canister rises to expose uncoated electrode surface.. There are benefits and trade-offs to consider when the application allows a choice between hard and softened water:.

Hard water: The benefit of hard water is less frequent draining and filling than with soft water, which results in better energy and water efficiency and more consistent steam output.. However, canister replacement could be more frequent with hard water, because mineral deposits coat the electrodes.. The harder the water, the more frequent the need for a new canister.. Softened water: The benefit of softened water is longer canister life depending on water chemistry than with hard water, because softened water does not coat the electrodes nearly as much as hard water..

However, softened water ions stay in solution to much higher concentrations than hard water ions.. This requires more frequent draining and filling, which results in lower energy efficiency, higher water consumption and less consistent steam output.. Each humidifier requires its own steam hose and dispersion tube. Do not connect steam hoses from more than one humidifier together. Back-pressure from one humidifier can lower the water level in the canister in the other humidifier and cause operational problems.

Do not install the dispersion tube in a duct with greater than 2 in. High duct pressure can cause backpressure in the canister which can result in unstable unit operation. When choosing a location for the dispersion tube three things must be considered: Location in duct, elevation with respect to the humidifier, and distance from humidifier to dispersion tube.. Absorption distance, the unobstructed straight line distance needed for steam to be fully absorbed, is dependent on air velocity, air temperature and relative humidity in the duct..

Determine absorption distance based on the lowest duct temperature, lowest air velocity and highest humidity that the system will see. The dispersion tube must be located in a straight section of duct far enough upstream of any obstructions or bends in the duct..

Use Table 3 to determine the appropriate absorption distance.. Operation during AC calls is not recommended because of the potential for condensation in the ductwork.. Configure controls to lock out the humidifier during AC calls and use the blower activation feature on the ADHC to allow the humidifier to run with the blower only.. Call Aprilaire Tech Support at for additional information on steam absorption..

The dispersion tube must be mounted with the plate on a vertical surface with the tube angled up as shown in Figure The steam tubelets must face up regardless of the airflow direction in the duct.. On horizontal duct runs install the dispersion tube low in the duct, on vertical runs center the tube on the duct.. Note: If dispersion tubes for two humidifiers are installed in one duct, double the dispersion distances..

If three dispersion tubes are installed, triple the dispersion distance.. Position dispersion tubes so one does not discharge directly onto another.. With the constant downward slope, any condensation that forms in the steam hose will drain back into the steam canister..

See Figure Failure to follow steam hose recommendations in this manual can result in reduced or erratic performance, increased noise and condensate in the duct. If the dispersion tube must be mounted below the humidifier or if the steam hose needs to run up and over an obstruction, a drip tee with drain trap, Part , must be installed as shown in Figure When using the Fan Pack, install Part close to the humidifier outlet to help prevent noise from gurgling as shown in Figure The capacity of the humidifier is reduced by the length of the steam hose or pipe due to condensation..

The maximum recommended length of steam hose is 6 feet.. Table 4 provides humidifier. Refer to governing codes for drain pipe size and materials. Support steam hose so there are no sags or low spots. Hose Clamp Dispersion Tube. Extreme temperatures may cause the humidifier to leak which can damage furnishings or structure..

Mount humidifier in a location that allows access for servicing, and clearance to remove front panel for replacing the canister and side panel for access to the electrical components during installation.. See Figure 8 for minimum clearances around humidifier.. The humidifier should be mounted as close to the dispersion tube as possible..

Table 4 shows how capacity is reduced as the distance between the humidifier and dispersion tube increases.. The humidifier can be mounted to a wood surface, or to sheet metal ductwork if it is structurally stable.. Do not mount humidifier to fiber duct board.. Sound isolation may be desired when mounting to sheet metal ductwork.. The humidifier must be mounted to a vertical surface and must be mounted level in the upright position.. Unpack carton.. Open front panel by removing screw and lifting panel up and away from humidifier..

Disconnect three wires from top of canister by pulling straight up..