Lennox International Inc. 505 - Manual (Page 11)

Page 11
EDA INSTALLATION/ SERVICE INSTRUCTIONS
Cooling Mode (Dehumidification OFF)
Figure 10 illustrates refrigerant flow in cooling mode (dehu-
midification mode OFF),
The liquid refrigerant from the outdoor unit enters the EDA
module . Since there is no demand for dehumidification,
the 3−way diverting valve assembly directs the flow back
out of the EDA module to the indoor unit expansion valve.
Cooling Cycle with EDA Coil Inactive (Model EDA−036C shown)
OUTDOOR UNIT INDOOR UNIT
INDOOR
COIL
air flow
INDOOR
BLOWER
VAPOR
LINE VALVE
CHECK/
EXPANSION
VALVE
See note 1 See note 1
See note 2 See note 2
7/8 x 7/8 x
3/8 TEE CHARGE COMPENSATOR
(NOT holding refrigerant)
See note 3.
LIQUID
LINE
VALVE
Figure 10
3−WAY
DIVERTING
VALVE
NOTE 1. In Cooling Mode, no air temperature change across EDA coils.
NOTE 2. In Cooling Mode, no liquid line temperature change across EDA coils.
NOTE 3. Charge compensator and 1/4" line not required on all systems. See Engineering Handbook.
CHECK/FLOW
RESTRICTOR
(flow restricted)
Heating Mode (Heat Pump Applications)
Figure 11 illustrates refrigerant flow in the heating mode.
In heat pump application heating mode, a system that in-
cludes an EDA unit will operate as a conventional heat
pump. The EDA unit does not operate in this mode.
Heat Pump Heating Cycle with EDA Coil Inactive (Model EDA−036C shown)
OUTDOOR UNIT
INDOOR UNIT
INDOOR
COIL
air flow
INDOOR
BLOWER
VAPOR
LINE VALVE
CHECK/
EXPANSION
VALVE
See note 1 See note 1
See note 2 See note 2
7/8 x 7/8 x
3/8 TEE CHARGE COMPENSATOR
See note 3.
LIQUID
LINE
VALVE
Figure 11
NOTE 1. In Heating Mode, no air temperature change across EDA coils.
NOTE 2. In Heating Mode, no liquid line temperature change across EDA coils.
NOTE 3. Charge compensator and 1/4" line not required on all systems. See Engineering Handbook.
CHECK/FLOW
RESTRICTOR
(flow restricted)