18. Install the blower scroll over the blower wheel into the larger end of the
keyholes on the blower scroll plate. Turn the scroll to the right to lock
it on. Pull the black lever clip closest to you toward the front of the
unit. See Figure 6.
19. Install the new air sample filter and tubing onto the fitting located on
the blower plate. See Figure 6.
20. Check the color of the CO
2 sensor. If it is brass-colored, it is a T/C
sensor. If it is white-colored, it is an I/R sensor.
• To replace a T/C sensor gasket, first remove the 2 wingnuts and
pull the sensor down. Then pull up on the brown connector to
unplug the sensor. Remove the gasket and install the new one. Be
sure to use the correct gasket from the kit by matching the center
hole diameter. Reconnect the T/C sensor. Note that the brown
connector is keyed. Secure the CO
2 sensor with the 2 wingnuts.
• To replace an I/R sensor gasket, first remove the 2 wingnuts and
pull the sensor down. Then disconnect the 2 latches and pull the
sensor off the connector. Remove the gasket and install the new
one. Be sure to use the correct gasket from the kit by matching the
center hole diameter. Reconnect the I/R sensor. Note that the
connection is polarized. Secure the CO
2 sensor with the 2
wingnuts.
21. Replace the grommets on the top duct with new ones included in this
kit.
22. Install the top duct by feeding the temperature sensor and air sample
filter (and RH sensor, if applicable) through the appropriate holes in
the top duct as it is raised to the chamber ceiling. Be careful not to pull
the grommets through the duct. Insert the left side of the top duct into
the left duct sheet opening. Locate the mounting studs, blower scroll
and air sample filter into their appropriate holes in the top duct. Secure
the top duct with the wingnuts. See Figure 4.
23. Carefully pull the temperature sensor (and RH sensor, if applicable)
down until it can be fastened into the corresponding clip(s) on the top
duct.
7Preventive Maintenance Kit 2270105
Installation - Release 4
(continued)
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