Lennox EDA - Cooling Mode (Dehumidification Off); Heating Mode (Heat Pump Applications); 5 Air Resistance

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4.2. Cooling Mode (Dehumidication OFF)
Thefollowinggure illustratesrefrigerantow incoolingmode (dehumidication
mode OFF), The liquid refrigerant from the outdoor unit enters the Humiditrol
module.Sincethereisnodemandfordehumidication,the3-waydivertingvalve
assembly directs the ow back out of the Humiditrol module to the indoor unit
expansionvalve.
OUTDOOR UNIT
INDOOR UNIT
INDOOR COIL
INDOOR
BLOWER
VAPOR
LINE
VALVE
CHECK/
EXPANSION
VALVE
See note 2
See note 2
7/8 x 7/8 x 3/8
TEE (furnished)
CHARGE COMPENSATOR
(NOT holding refrigerant) See note 3.
LIQUID
LINE
VALVE
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 Product Specifications.
CHECK/FLOW
RESTRICTOR
(flow restricted)
AIR FLOW
see note 1
AIR FLOW
see note 1
Figure 25. Cooling Cycle with Humiditrol Coil Inactive (Model EDA-036C
Shown)
4.3. Heating Mode (Heat Pump Applications)
Thefollowinggureillustratesrefrigerantowintheheatingmode.Inheatpump
applicationheatingmode,asystemthatincludesanHumiditrolunitwilloperateas
aconventionalheatpump.TheHumiditrolunitdoesnotoperateinthismode.
AIR FLOW
see note 1
INDOOR UNIT
INDOOR COIL
INDOOR
BLOWER
VAPOR
LINE
VALVE
CHECK/
EXPANSION
VALVE
See note 2
See note 2
7/8 x 7/8 x 3/8 TEE
(furnished)
CHARGE COMPENSATOR
See note 3.
LIQUID
LINE
VALVE
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 Product Specifications.
CHECK/FLOW
RESTRICTOR
(flow restricted)
OUTDOOR UNIT
AIR FLOW
see note 1
3-WAY
DIVERTING
VALVE
Figure 26. Heat Pump Heating Cycle with Humiditrol Coil Inactive (Model
EDA-036C Shown)
5. aIr resIstance
The following table shows air volume and total air resistance for the available
Humiditrol models.
Table 8. Air Resistance
Model No. Air Volume Total Air Resistance
EDA-024B
cfm L/s in. w.g. Pa
400 190 0.05 12
600 285 0.10 25
800 380 0.15 37
1000 470 0.22 55
EDA-036C
600 285 0.05 12
800 380 0.08 20
1000 470 0.11 27
1200 565 0.15 37
1400 660 0.20 50
EDA-060D
1000 470 0.05 12
1200 565 0.06 15
1400 660 0.08 20
1600 755 0.10 25
1800 850 0.11 27
2000 945 0.13 32
2200 1040 0.15 37