Description; General Description; Ca Equipment Location -- Front Section; Calibration, Gas Charge And Pressurization/Gage Ports - Carrier 69NT40-489-100 Series Operation And Service Manual

8.1 GENERAL DESCRIPTION

8.1.1 CA Equipment Location - - front Section
Many of the Controlled Atmosphere (CA) components
are accessible from the front of the unit. These items,
see Figure 56, include the intake air filter and pressure
relief (breather) valve mounted in the right upper access
panel, three access ports, flow meter, and the controlled
atmosphere control box.
8.1.2 Calibration, Gas Charge and Pressurization/
Gauge Ports
The calibration gas,
pressurization/gauge ports are all located on the front of
the unit, see Figure 56. A second CO
located in the evaporator section, see Figure 57, page
90.
9
2
2
8
7
1. Air Intake Filter, Pressure Relief (Breather)
Valve & Access Panel
2. CA Warning Labels
3. Refrigeration Unit Control Box
4. Pressurization/Gauge Ports (For Container Leak
Check)
5. Flow Meter (gas calibration)
Figure 56. Controlled Atmosphere Components - - Front Section
SECTION 8

DESCRIPTION

CO charge and
2
charge port is
2
5
6
4
Functions of the various ports are:
Pressurization/gauge ports are used to leak
S
check the container by pressurizing with one
port and attaching a pressure gauge onto the
other port and monitoring for leakage.
A calibration gas port is used with the
S
Controlled Atmosphere (CA) Controller and a
calibration gas tank to calibrate the oxygen
sensor and to check the carbon dioxide
sensor.
Carbon dioxide charge ports are used for
S
applications requiring increased concentration
levels of carbon dioxide.
6. Gas Calibration Port (Used to calibrate the O
sensor and to check the CO
7. Front Carbon Dioxide Gas Charge Port
(Used to attach a CO
8. Controlled Atmosphere Control Box
9. Fresh Air Makeup Vent & Access Panel
89
1
2
3
2
sensor)
2
bottle)
2
T-305