Specifications

 Factory installed Top Vent Pressure Sensing Tube
 Supplied Rear Vent Pressure Sensing Tube
 Removal of Top Vent air bafe and pressure sensing tube.
 Removal of Top Vent air bafe and pressure sensing tube.

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XG0771 - 040513
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Section 3-1-2: Converting the Pressure Sensing Tube
and Air Bafe
When the R520*/R620* is converted from Top Vent to Rear Vent,
the pressure sensing tube must be removed and replaced with
supplied Rear Vent pressure sensing tube and air bafe must be
relocated as described below.
1. Remove two screws from the air bafe installed over the Top
Vent from inside the rebox. Once air bafe is removed, replace
the two screws back into the same position.
Note: Not all models are equipped with an air bafe. Only convert
if available.
2. Remove Top Vent pressure sensing tube but loosening the
compression nut with a 1/2" wrench.
3. Position the supplied Rear Vent pressure sensing tube as
4. Install air bafe over Rear Vent from inside the rebox with two
screws provided at the Rear Vent.
shown in Figure 7a. Hand tighten the compression nut by
hand and then a half-turn with a wrench.
Do not over tighten.