DRaIn lIne
Attach the 7/8” I .D . drain tubing provided to the drain assembly at the bottom of the humidifier . Secure with the hose clamp provided . Do not
over tighten .
Make sure the drain line has a constant downward slope from the humidifier to the drain and is not kinked or blocked .
If floor drain is not available, use condensate pump (Part #4856) to route water to a suitable drain .
note:
The humidifier uses cold water to temper drain water to less than 140°F .
aUToMaTIC DIGITal ConTRol anD ConTRol wIRInG
The control circuit operates on 24VAC .
The ADHC (Automatic Digital Humidifier Control) Model 62 must be mounted in the return air duct at least 6” upstream of any fresh air intake
ducts or sources of moisture and at least 12” from the steam dispersion tube if it is mounted in the return . Follow instructions provided with the
control . Connect “H” terminals on ADHC to “HUMIDISTAT” terminals on humidifier circuit board . The “H” terminals on the Model 62 provide a
dry contact switch to energize the humidifier, if 24V is applied to the Humidistat terminals on the Model 800, the control board will be damaged .
If the application requires a wall-mounted humidistat in the conditioned space, use Manual Humidistat Part #4655 or Digital Manual Humidistat
Part #65 . In order to allow the humidifier to turn on the HVAC system blower when humidity is required with either of these humidistats, use
Blower Activation Relay Part #4851 .
If protection from over-humidification is desired, install optional high humidity limit switch Part #4594 at least 4 feet downstream of the
dispersion tube . If airflow verification is desired, install optional airflow proving switch Part #4592 in duct . The high humidity limit switch and the
airflow proving switch are wired in series with the ADHC (humidistat) circuit . See
figure 7
.
InSTallaTIon InSTRUCTIonS
(ConTInUeD)
24 VAC from HVAC
Equipment “R” & “C”
Communication with
Aprilaire 8570 Thermostat
Outdoor Temperature Sensor
Heat Signal from HVAC Equipment
Fan Signal from Thermostat
Fan Signal to HVAC Equipment
MODEL 62 DIGITAL HUMIDIFIER CONTROL
24V TERMINALS
OPTIONAL:
AIR FLOW PROVING SWITCH #4592
Connect 1/4" plastic tubing from H (High) side
of proving switch to the airflow sensing probe
located 1.5 duct diameters downstream of
blower. Leave L (Low) side open to amosphere.
OPTIONAL:
HIGH HUMIDITY LIMIT SWITCH #4594
Switch breaks C to NC connection when
measured RH is above setpoint RH.
H Gf
R C A B ODT
G
W
H
FA
N P
ACK
HUMIDIS
TAT
C NO NC
C
NO
NC
fIGURe 7 – Model 800 accessory wiring
90-1544
11
