Pre-Gassing Procedure; Initialize Everfresh Atmospheric Conditions - Carrier EverFRESH Operation, Service And Parts Manual

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Do not inject gas into the container unless there is an exhaust port. Charging disk (part # 79-

04098-03) has one port for injecting gas and one for exhaust. Both ports need to be opened. If

the charging disk is not available, the manual fresh air vent must be opened. Damage to the

unit and risk of personal injury exists if a pressure relief pathway is not established.

7.1

Initialize EverFRESH Atmospheric Conditions

The purpose of this procedure is to create optimal conditions that have been studied and shown to slow the

ripening cycle of some commodities by the use of nitrogen (N2) and carbon dioxide (CO2) gas cylinders.

Procedure:

1. Install the Carrier Transicold disk with charging ports (part # 79-04098-03) if available. Refer to

Connect the charging hose and leave the second port open.

2. If Carrier Transicold disk is not installed, open the manual fresh air vent to allow for charging of gas.

For units equipped with a Vent Position Sensor (VPS):

a. Bring up Cd71 on the display and set to OFF mode to disable all EverFRESH operations.

b. Bring up Cd45 and open the manual fresh air vent until the display reads 10 CFM.

For units not equipped with a Vent Position Sensor (VPS):

a. Open the manual fresh air vent until the indicator points to approximately 9 CFM.

3. Bring up Cd71 and enable Purge mode. This is done to establish the amount of time to purge the unit of O2

and CO2. Refer to

If not using Purge mode, the CO2 and O2 levels can be viewed in Cd44.

4. Purge mode is now active.

5. To establish a lower level of O2 in the unit, charge the container with N2 gas to displace the excess O2.

Connect the hose from the N2 regulator to the unit equipped gas injection port. Then, start releasing N2 gas

until the O2 percentage reaches the desired level.

If injection pressure is too high, there is a risk of clearing the unit defrost condensate trap. If this hap-

pens, the condensate trap will need to be refilled with water. If the condensate trap has been cleared

of water, then a leak exists that will hinder atmosphere control.

6. To establish the proper level of CO2 in the unit, charge with CO2 gas. Connect the purging hose to the CO2

regulator. After injection, the sensor may read much lower than this for at least 30 minutes.

Increasing the CO2 pressure too high will run the risk of freezing the regulator. Due to mixing and sen-

sor lag, the CO2 level will continue to rise for some time after stopping the CO2 regulator.

7. Once the Purge mode timer is expired, remove the gas injection hose connections and close the manual

fresh air vent. If gas concentrations reach desired levels prior to the timer expiring, set Purge mode in Cd71

to OFF prior to closing the manual fresh air vent. When the timer is expired or Purge mode is set to OFF to

disable it, the unit will revert to Fresh mode using the setpoints entered for Purge mode.

Section 7