Aprilaire 700 Application Manual page 12

AIR CondITIonInG – AIR HAndlInG unIT
WITH ACCeSSIBle SuPPly And ReTuRn PlenuMS
Recommended Series: 800, 800 with 850 Fan Pack
CAuTIon – Condensation damage.
Cold surfaces of cooling coils and ductwork will cause condensation.
Size the Model 800 absorption distance appropriately for the cold temperatures or lock out humidifier during AC calls.
Plenum Temperature
For plenum temperatures below 90°F.
For more effective humidification, lock out the humidifier during an AC call and run with Blower Activation only.
Inlet Water Temperature
Model 800 Steam humidifier MUST be plumbed to COLD water only.
Variable Speed Blowers
The more hot air delivered to the dispersion tube, the faster steam is absorbed into the air stream. Systems with low continuous fan speeds
will have reduced absorption unless the fan speed setting is increased. Set the continuous fan speed to approximately the same speed as a
heat call setting.
Blower Activation
The Blower Activation feature on the Model 62 humidifier control will sample the household air if the HVAC system has been idle for one hour
and will energize the HVAC fan to allow the humidifier to run for two hours or until the desired humidity level is reached, whichever comes
first. If humidity levels are not reached during a normal heating call, the Blower Activation feature will extend the blower call for two hours or
until the humidity call is satisfied, whichever comes first.
The Model 800 Steam Humidifier must be plumbed to COLD water only, in order to temper drain water.
Third Party Controls
The Model 800 supplies 24VAC internally. If a third party control that supplies 24VAC is used with the Model 800, use an isolation relay to
switch power. DO NOT apply 24 VAC to the HUMIDISTAT terminals.
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