Figure 3.1 Everfresh Air And Gas Flow Diagram - Carrier EverFRESH Operation, Service And Parts Manual

cargo space. The Nitrogen Sampling orifice regulates the flow of nitrogen to the EverFRESH Nitrogen Valve (EN).
The controller will open EN to allow the gas to flow into the sensor package for testing at the O2 Sensor. Elevated
amounts of oxygen indicate the Nitrogen Membrane may be clogged. The EN is only energized during Pre-trip test
P20-5 N2 Check. Otherwise, when the EN is closed during normal operation, gas is forced out of the Nitrogen
Supply orifice. After having the oxygen level tested, the nitrogen flows through the CO2 Sensor and is then
exhausted back into the cargo air stream above the fan deck.
On systems equipped with a CO2 Injection option, the CO2 Injection Valve (CSV) will control to the CO2 setpoint.
As CO2 levels drop below the setpoint, the CSV will open to raise CO2 levels.
2
17
Fan Deck
14
16
15
Compressed Ambient Air
Clean Dry Air
Nitrogen
Oxygen & Carbon Dioxide
Cargo Air
Carbon Dioxide
1) Air Compressor
2) Condensing Loop
3) Water Separator & Particulate Filters
4) Water Drain Valve (WDV)
5) Membrane Pressure Transducer (MPT)
6) EverFRESH Air Valve (EA)
7) Fresh Air Supply to Cargo Space
8) Nitrogen Membrane Separator
9) O2 and CO2 Sent to Ambient
10) Nitrogen Supply to Cargo Space
11) Nitrogen Orifices (supply and sampling)
T-374

Figure 3.1 EverFRESH Air and Gas Flow Diagram

11
13
5
12
7
6
21
22 20
10
3
19
4
18
1
12) EverFRESH Nitrogen Valve (EN)
13) O2 Sensor
14) CO2 Sensor
15) Sensor Filter Assembly
16) Cargo Air Sensor Inlet
17) Cargo Air Sensor Outlet
18) CO2 Injection Bottle (not included with equipment)
19) CO2 Injection Pressure Transducer (IPT)
20) CO2 Injection Valve (CSV)
21) CO2 Supply Orifice Cap
22) CO2 Supply to Cargo Space
- - - - -
3–2
8
9