Pentair ETi 400 Installation And User Manual page 29

DIRECT AIR INTAKE KIT (P/N 475971) INSTALLATION
IMPORTANT: For indoor heater installations with Direct Air Intake duct using 4 in PVC duct it is required to order and install
the Direct Air Intake Kit (P/N 475971).
To install the Direct Air Intake Kit (see Figure 22), the steps are as follows:
1. Remove the side panel from the heater to access the Vent Terminal (see illustration below). Using a flat-blade
screwdriver, insert press and turn the screwdriver to unlock the panel.
2. Remove the Air Intake Vent cover from the top of the heater.
3. Insert the spigot part of the street wye up through the air intake hole in the top panel.
4. Insert the 45° elbow into the 3 in pipe section of the assembly that has the street wye.
5. Adjust the 45° elbow to align each 3 in pipe section with the air orifice.
6. Push the air intake assembly into the air orifices. Note: Be sure the top part of the elbow is concentric to the air
intake hole in the top panel (see Figure 23).
7. Place the 3 x 4 in reducer to the street wye plate of the elbow and secure it with the 3 sheet metal retaining
screws.
3 in x 4 in
Remove air Intake
air intake reducer
cover
Side panel
latch lock
Figure 22.
Rev. A 9/2016
Step 4
Step 1 & 2
Figure 23.
ETi 400 High Efficiency Pool and Spa Heater Installation and User's Guide
Section 2: Installation Instructions
Street Wye
Street Elbow
Air Orifices
29
Step 3