Lennox International Inc 505 Leak Testing, Evacuating, Charging, 3−way Diverting Valve Operation

Leak Testing, Evacuating, Charging

IMPORTANT

Prior to starting the outdoor unit for charging, be

IMPORTANT sure the 3-way valve is energized and in the ing" (forward) position (see figure 7).

The 3−way diverting valve actuator shaft setscrew	3. Very little charge is required for the additional volume
(see figure 7) is factory set and is not to be adjusted.
	of the EDA unit. When in normal cooling, the compo-
	nents will all be occupied by vapor that has very little
3−way Diverting Valve Operation	weight. At most (depending on the model) an addition-
NOTE − During system operation, the 3-way valve requires	al 1/4 pound of refrigerant may be required.
24-volt power to drive between cooling and dehumidifica-	4. When shifting from dehumidify mode to cooling, or
tion.	vice versa, wait at least 10 minutes for the system to
The 3−way diverting valve is actually two valves connected	reach stable operating pressure before checking tem-
by a common shaft, designed to open one valve while clos-	peratures and pressures, or adjusting refrigerant
ing the other, and vice versa. For evacuating (with power	charge.
off), the diverting valve can be REPOSITIONED using its	NOTE − Prior to starting the outdoor unit for charging,
actuator lever, a long setscrew that has been factory-set to
	set the thermostat to call for cooling (dehumidification
a precise point on the common shaft. Do not loosen (un-
	OFF). It will take about 90 seconds for the 3−way di-
screw) the setscrew. Should the setscrew become
	verting valve to energize and shift to the cooling posi-
loose, carefully follow the note in figure 6 to position
	tion. To ensure that the 3-way diverting valve is ener-
and tighten it.
	gized and in the
	the position of the 3-way diverting valve actuator shaft
Re−aligning Setscrew	setscrew in figure 7; if properly shifted, the setscrew
	will be in the forward position.
NOTE − Actuator shaft setscrew is factory set and must not be ad-
justed. If the set screw should become loose, use a pliers to grip the	Setting 3−Way Diverting Valve to
shaft where shown (1) and rotate the shaft (in direction of the black
	Evacuate Position
arrow) until the pin stops (inset shows pin and stops). Press the red
button (2) in the direction of the white arrow and move the lever (3)	1. PUSH RED TAB IN DIRECTION INDICATED.
to the forward position and tighten setscrew to 60 in-lbs torque.	2. PUSH ACTUATOR SHAFT DOWN TOWARD THE
	CENTER−OF−TRAVEL POSITION
2
1	1

3

2

STOP
PIN
SHAFT
STOP
	COOLING
Figure 6	(FORWARD)
	EVACUATE
	(CENTER)
Leak Testing, Evacuating, Charging	DEHUMIDIFICATION
1. Set the 3−way diverting valve actuator shaft to the cen-	(REARWARD)
ter (evacuate) position for leak testing and evacuation	Figure 7
(see figure 7). IMPORTANT! The actuator shaft
must be set as described to allow the EDA to evac-	5. The charge must be checked with the system in cool-
uate more quickly.	ing operation (dehumidification OFF). After testing
2. Refer to instructions provided with the outdoor unit for	and charging as required, set the thermostat to force
leak testing, evacuating and charging procedures.	a demand for dehumidification.
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EDA 01/06