69
INTEGRATED FURNACE CONTROL
2.) The humidistat must determine that there is a need for
humidification.
Note: Dipswitch S2-8 (labeled “ODD”) enables(“ON”) or
disables (“OFF”) de-humidification operation.
However, it has no effect on humidification operation. If
this switch is set to the “ON” position and no humidistat is
installed, the cooling airflow will be reduced by
approximately 15% giving less than optimal performance
and possibly causing problems. It is not recommended to
leave this switch in the “ON” position without a humidistat
installed. Control of dehumidification in cooling and/or
humidification in heating can be done with a variety of
methods depending on whether there is a communicating
thermostat or a humidistat available and depending on the
type of operation desired.
With systems configured with communicating thermostats
and condensers, dehumidification is controlled by the
thermostat and is not affected by the position of dipswitch
SW2-1 or the voltage at the thermostat input T2 labeled
“HUM STAT” on the furnace. To determine which wiring
diagram and method to use, select from the following
configurations:
A. HUMIDIFICATION CONTROL ONLY WITH NO
DEHUMIDIFICATION (REQUIRES OPTIONAL
HUMIDIFIER).
A1. WITH COMMUNICATING THERMOSTAT
Humidifier control is included with EcoNet control center.
To wire the furnace for humidification control using an
EcoNet communicating thermostat, refer to the wiring
diagram in Figure 49 Option A. Be sure not to install the
jumper between “R” and “HUMSTAT” on the furnace
control. Installing this jumper will operate the humidifier
any time there is a heat call. Without the jumper, the
humidification call from the thermostat must be active and
a heat call must be present with the blower running.
A2. WITH NON-COMMUNICATING THERMOSTAT
A2-1 CONTINUOUS HUMIDIFIER OPERATION DURING
HEATING.
For continuous humidifier operation during heating, refer
to Figure 49 Option B and make sure to install the jumper
between the thermostat terminals labeled “R” and “HUM
STAT”. A separate humidistat is not required for this
configuration and the humidifier will turn on whenever
there is a call for heat and the blower is running.
FIGURE 45
ELECTRONIC AIR CLEANER AND HUMIDIFIER TERMINALS
An optional 24VAC humidistat can be installed asshown in Figures 46 thru 49. With the optional
humidistat,two separate conditions must be met before humidificationcan begin 1). There must be a call
for heatand the blower must be engaged and 2.) The humidistatmust determine that there is a need for
humidification.
Note: Dipswitch S2-8 (labeled “ODD”) enables(“ON”) or disables (“OFF”) de-humidification operation.
However, it has no effect on humidification operation.If this switch is set to the “ON” position and no
humidistat is installed, the cooling airflow will be permanentlyreduced by approximately 15% giving less
than optimal performance and possibly causing problems.It is not recommended to leave this switch in
the“ON” position without a humidistat installed.Control of dehumidification in cooling and/or
humidificationin heating can be done with a variety of methodsdepending on whether there is a
communicatingthermostat or a humidistat available and depending onthe type of operation desired.
With systems configured with communicating thermostatsand condensers, dehumidification is controlled
by the thermostat and is not affected by the position ofdipswitch SW2-1 or the voltage at the thermostat
inputT2 labeled “HUM STAT” on the furnace. To determinewhich wiring diagram and method to use,
select fromthe following configurations:
A. HUMIDIFICATION CONTROL ONLY WITH NODEHUMIDIFICATION (REQUIRES OPTIONAL
HUMIDIFIER).
A1. WITH COMMUNICATING THERMOSTAT
Humidifier control is included with EcoNetcommunicating thermostats. To wire the furnacefor
humidification control using anEcoNet communicating thermostat, refer tothe wiring diagram in Figure 46.
Be sure notto install the jumper between “R” and “HUMSTAT” on the furnace control. Installing this
FIGURE 48
ELECTRONIC AIR CLEANER AND HUMIDIFIER TERMINALS
ST-A1194-77-00
HUMIDIFICATION/DEHUMIDIFICATION
Int
eg
rat
ed
Fu
rn
ace
Co
ntr
ol
