Lennox EDA - Dehumidification Requirements; 3 Enabling Thermostats for Humiditrol; Cs7500 Residential Thermostat

20
Overcoolingrangesfrom2ºFbelowthecoolingsetpoint(MINsetting)downto2ºF
abovetheheatingsetpoint(MAXsetting).Halfwaybetweenthetwosettingsisthe
MID setting.
Table 6. Humiditrol Comfort Adjust Parameters
Humiditrol Comfort Adjust parameters Indoor temperature is greater than:
Maximumovercooling 2%aboveheatingsetpoint
Midpointovercooling
HeatSetpoint+CoolSetpoint
2
Minimumovercooling 2°Fbelowcoolingsetpoint
2.8. Dehumidication Requirements
Humiditrol can only operate when the thermostat is set to COOL orAUTOand
meetstheparametersdescribedinthefollowingtable.Ifthethermostatissetto
HEATmode, no dehumidication will occur! Thermostat cycles heating ON and
OFFtomaintainheatingsetpoint.
Table 7. Thermostat Operation with Humiditrol Enabled
Thermostat set to COOL mode-
Dehumidication will only occur if:
Thermostat set to AUTO changeover-
Dehumidication will only occur if:
• Outdoorsensoronroomthermostat
installedandsetup
• Dehumidicationenabledoninstaller
settings
• Dehumidicationdemandispresent
• Coolingdemandisnotpresent
• Outdoortemperatureislessthen95ºF
• Indoortemperatureisnotcoolerthan
65ºF
• Outdoorsensoronroomthermostatinstalledand
setup
• Dehumidicationenabledoninstallersettings
• Dehumidicationdemandispresent
• Coolingdemandisnotpresent
• Outdoortemperatureislessthen95ºF
• Indoortemperatureisnotcoolerthan65ºF
• Indoor temperature is not cooler than 2ºF above
heatingsetpoint.
Iftheconditionsabovearemet,24VACis
removedfromtheHumiditrol”D”terminal
andcoolingbegins(Indoorvariablespeed
motorrunsatdehumidicationspeedand
outdoorunitbeginsthecoolingcycle).
CoolingcallshavepriorityoverHumiditrol
calls.
Inthiscase,24VACisremovedfromtheHumiditrol
”D”terminalandcoolingbegins(Indoorvariable
speedmotorrunsatdehumidicationspeedand
outdoorunitbeginsthecoolingcycle).Coolingcalls
havepriorityoverHumiditrolcalls.Humiditrolmode
overcoolingisuseradjustableandisdescribedin
Using Humiditrol Comfort Adjust.
HumiditrolmodeovercoolingisuseradjustableandisdescribedinUsingHumiditrolComfort
Adjust.
NO
Is
indoor
temperature
greater than 2ºF
below cooling set
point
?
Is
indoor temp.
greater than the heat
setpoint plus the cool
setpoint divided by 2?
YES
NO
one or both
is true
neither
is true
Is
there a
dehumidification
demand
?
DEACTIVATE
ALL EQUIPMENT
RUN EQUIPMENT
IN NORMAL
HEATING MODE
RUN EQUIPMENT
IN NORMAL
COOLING MODE
Is
EITHER true:
outdoor temp. > 95ºF;
indoor temp. < 65ºF
?
Humiditrol
Comfort Adjust
setting is:
RUN
HUMIDITROL
START
Is
there a heating
demand
?
YES
NO
YES
Is
there a cooling
demand
?
NO
YES
YES
NO
Is
indoor
temperature
greater than 2ºF
above heating set
point
?
YES
NO
DEACTIVATE
ALL EQUIPMENT
LEGEND:
CSP = Cooling Set Point
HSP = Heating Set Point
Figure 20. Thermostat Operation with Humiditrol Enabled
3. enablInG thermostats for humIdItrol
3.1. CS7500 Residential Thermostat
NOTE - Humiditrol operation requires
use of an outdoor sensor. If sensor is not
connected enable plus Humiditrol selected.
played in the information display.
1.Touch menu option from the
home screen.
2.Touch and hold the settings option on the
menu. This will display the installer settings
confirmation screen. Touch confirm
ue.
installer settings
confirm
<
installer settings must be set
by qualified person.
A selection option under Installer settings > Humidity settings > Dehumidify > Dehumidify mode must be enabled
before
tive humidity (RH). The installer settings include:
Installing Outdoor Sensor
Install the
light or other heat sources that may affect its sensitivity.
NOTE - The outdoor sensor uses standard thermostat wiring; it may be wired using two wires of a multi-wire cable
with a wire run not to exceed 300 feet or 100 meters.
1.Connect outdoor sensor to terminals Tc and To on thermostat.
2.Outdoor sensor also has to be enabled under menu > settings > outdoor sensor = yes or no.
1.NORMAL
2.MAX
3.AUXILIARY DEHUMIDIFIER
4.HUMIDITROL
5.OFF
Figure 21. ComfortSense 7500 Thermostat—Add and Adjust Humiditrol