Lennox EDA - Using Humiditrol Comfort Adjust; Leak Testing, Evacuating, Charging; Insulating And Sealing The Unit; Other System Components

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2.4.2. Leak Testing, Evacuating, Charging
1. Setthe3-waydivertingvalveactuatorshafttothecenter(evacuate)positionfor
leaktestingandevacuationasillustratedinthefollowinggure.IMPORTANT!
TheactuatorshaftmustbesetasdescribedtoallowtheHumiditroltoevacuate
morequickly.
2. Refertoinstructionsprovidedwiththeoutdoorunitforleaktesting,evacuating
andchargingprocedures
3. VerylittlechargeisrequiredfortheadditionalvolumeoftheHumiditrolunit.
Wheninnormalcooling,thecomponentswillallbeoccupiedbyvaporthathas
verylittleweight.Atmost(dependingonthemodel)anadditional1/4poundof
refrigerantmayberequired.
4. When shifting from dehumidify mode to cooling, or vice-versa, wait at least
10minutesforthesystemtoreachstableoperatingpressurebeforechecking
temperaturesandpressures,oradjustingrefrigerantcharge.
NOTE: Prior to starting the outdoor unit for charging, set the thermostat to call for
cooling (dehumidication OFF). It will take about 90 seconds for the 3-way
diverting valve to energize and shift to the cooling position. To ensure
that the 3-way diverting valve is energized and in the “cooling” (forward)
position, observe the position of the 3-way diverting valve actuator shaft
pinch bolt in the following gure; if properly shifted, the pinch bolt will be in
the forward position.
1
2
COOLING
(FORWARD)
EVACUATE
(CENTER)
DEHUMIDIFICATION
(REARWARD)
1. PUSH RED TAB IN DIRECTION INDICATED.
2. PUSH ACTUATOR SHAFT DOWN TOWARD THE
CENTER-OF-TRAV EL POSITION
Figure 19. Setting 3-Way Diverting Valve to Evacuate Position
5. The charge must be checked with the system in cooling operation
(dehumidication OFF). After testing and charging as required, set the
thermostattoforceademandfordehumidication.
2.5. Insulating and Sealing the Unit
IMPORTANT
Allpiping,meteringdevices,andconnectionsmustbeinsulatedtopreventmois-
turedamagecausedbysweating.
Sealthe unitso thatwarm airis not allowed into thecabinet.This isespecially
importantwhentheunitisinstalledinanunconditionedarea.Makesuretheliquid
lineentrypointsaresealedwitheitherrefrigeranttubeinsulatingmaterialorwith
Permagum.
2.6. Other System Components
2.6.1. Blower Control
When Humiditrol units are to be applied with an indoor unit that has a variable
speedmotor(VSM),thenrefertotheindoorunitinstallationinstructionforsetting
blowerspeed.
2.6.2. Thermostat and Sensor
RefertotheComfortSense7500,iComfortE30,M30orS30ThermostatInstallation
andSetupGuidefornon-communicatinginstallation,wiring,andsetup.
NOTE: Lennox communicating outdoor units have an outdoor sensor installed.
If these units are connected to a Lennox communicating thermostat, an
optional outdoor sensor is not needed.
IMPORTANT
EitheraCS7500oriComfortfamilythermostatalongwithaproperlyconnected
outdoortemperaturesensorarerequiredfortheHumiditrolunittofunctionprop-
erly.
Installtheremotesensorontheoutsideofanorthernwallofthehome,awayfrom
directsunlightorotherheatsourcesthatmayaffectitsabilitytoaccuratelysense
outdoortemperature.
2.7. Using Humiditrol Comfort Adjust
IfHumiditrolisenabledintheinstallersettings,thentheHumiditrolAdjustmentin
theUserSettingsaffectsovercoolingoperation(see“Table6.HumiditrolComfort
Adjust Parameters” on page 20 and “Figure 20. Thermostat Operation with
HumiditrolEnabled”onpage20describetheparametersandillustrateHumiditrol
operationundertypicalsettings).