Lennox International Inc. 505 - Manual (Page 6)

Page 6
EDA 01/06
Required Parts (all applications)
EDA Unit, with check/flow restrictor & label
Appropriate SignatureStat t Thermostat
46M98 − Outdoor Sensor
84X49 − Twisted Pair Wire
Appropriate Insulation and Piping Kit
Required Parts (2−Stage Heat Pump appl.)
12P61 − 75VA Transformer (for HP applications)
Installation Process
YES
NO
NO
YES
ENSURE ALL POWER IS OFF
INSTALL EDA UNIT IN DUCT
SYSTEM
INSTALL THE CHARGE
COMPENSATOR (IF REQUIRED)
IN CONVENIENT LOCATION
(SEE FIGURE 5)
MAKE ALL REFRIGERATION
CONNECTIONS, BEING SURE
TO INSTALL THE CHECK/FLOW
RESTRICTOR (SEE FIGURE 5)
LEAK CHECK THE SYSTEM
WITH 3−WAY VALVE ASSEMBLY
SET TO EVACUATE" (SEE
FIGURE 7)
INSULATE ALL REFRIGERANT
LINES
EVACUATE THE SYSTEM AS
DESCRIBED IN THE OUTDOOR
UNIT INSTALLATION
INSTRUCTIONS
INSTALL OUTDOOR SENSOR
PROCURE
MISSING PARTS
ARE
ALL REQUIRED
PARTS
AVAILABLE
?
IS
THE
OUTDOOR
TEMPERATURE
BELOW
95ºF
?
SET COOLING SETPOINT ON ROOM THERMOSTAT
TO 2 DEGREES ABOVE INDOOR TEMPERATURE
(OUTDOOR UNIT WILL TURN OFF)
NOTE − A Humiditrol ® EDA−equipped system is allowed
to operate and cool room temperature below set point
(but only by 2ºF) when trying to satisfy a persisting hu-
midity set point.
DEHUMIDIFICATION
IS DE−ACTIVATED;
CHECK FOR
CORRECT
OPERATION AT A
TIME WHEN
AMBIENT
TEMPERATURE IS
BELOW 95ºF.
OUTDOOR UNIT:
COMPRESSOR IN HIGH STAGE;
FAN IN LOWEST SPEED;
EDA:
3−WAY VALVE ASSEMBLY TO DEHUMIDIFICATION"
POSITION
INDOOR UNIT:
FAN IN DEHUMIDIFICATION SPEED
CHECK THE TEMPERATURE DIFFERENCE
ACROSS THE EDA COIL AND THE LIQUID LINE
TEMPERATURES AS NOTED IN FIGURE 9 ON
PAGE 10
Check Dehumidification Operation
MAKE WIRING CONNECTIONS
AS SHOWN IN FIGURES 12 & 13
(SEE PAGES 14 AND 15)
INSTALL EDA" LABEL ON
OUTDOOR UNIT
POWER UP THE INDOOR UNIT
CHECK THAT 3−WAY VALVE
ASSEMBLY IS SET TO
COOLING" POSITION AS
SHOWN IN FIGURE 7
ENABLE HUMIDITROL ON
ROOM THERMOSTAT (SEE
FIGURE 8)
SET THERMOSTAT FOR
MAXIMUM COOLING
OPEN REFRIGERANT VALVES
TURN OUTDOOR UNIT MAIN
POWER ON
CHECK CHARGE AND CHARGE
AS NEEDED (SEE PAGE 8)
start
EDA Installation & Checkout Flow Chart
Figure 4
SET DEHUMIDIFICATION SETPOINT TO 5% BELOW
CURRENT ROOM RELATIVE HUMIDITY