Pentair ETi 400 - Page 30

ETi 400 High Efficiency Pool and Spa Heater Installation and User’s Guide Rev. C 4/2017
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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 23), the steps are as follows:
1. Remove the side panel from the heater to access the Vent Terminal (see illustration below). Using a at-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.
Figure 23.
Figure 24.
Section 2: Installation Instructions
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 orice.
6. Push the air intake assembly into the air orices. Note: Be sure the top part of the elbow is concentric to the air
intake hole in the top panel (see Figure 24).
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.
DIRECT AIR INTAKE KIT (P/N 475971) INSTALLATION
Side panel
latch lock
3 in x 4 in
air Intake
reducer
Remove
air intake
cover
Street Wye
Street Elbow
Step 1 & 2
Step 3
Step 4
Air Orifices
Upper Blower Inlet
Air Orifice
Lower Blower Inlet
Air Orifice