Pentair ETi 400 Guide D'installation page 9

Replacing Combustion Blower (Continued)
11. Remove and discard the blower gasket and
unscrew the four 4x10 MM torx screws.
12. Replace the blower adapter, install the new blower
adapter and secure it to the heat exchanger with
the four 4x10 MM torx screws.
13. Install the new blower gasket into the blower
adapter. Be sure the gasket is aligned properly on
the blower adapter, see Figure 4.
14. Remove the one short section of ¾" NPT pipe from
the blower and install it to the new blower using
paste.
15. Remove the air orifice from the blower being
replaced and install it into the new blower and
secure it with the 10-16 screws.
For Technincal Support, call (800) 831-7133.
WARNING! Fire and explosion hazard. The Air Orifice is
sized specifically for the air/gas mixture required by the
burner. Do not modify the Air Orifice or replace it with an
orifice of a different size. Exhaust from an improperly
sized air orifice will contain toxic levels of carbon monoxide
gas and flue gases, which can cause serious injury or
death. CARBON MONOXIDE GAS IS A DEADLY, is a
dangerous, poisonous gas you cannot see or smell.
WARNING! Fire and explosion hazard. The Combustion
Air Blower handles a combustible air/gas mixture. When
servicing this part, check all seals for tightness to ensure
the Blower is not leaking. Pentair strongly recommends
after replacing an air orifice initially and periodically test
it for proper operation. This testing can be accomplished
by using a hand-held carbon monoxide meter and/or by
consulting with a gas professional.
16. Detach the air flow switch from the blower being
replaced and install it into the new blower and
secure it with 6-32 screws.
17. Install the blower by sliding the flange holes through
the blower adapter studs. Secure the blower with
the four 5/16-18 hex nuts.
18. Reconnect the wires to the air flow switch and the
wires to the blower at the connector.
19. Install the new plastic tubing (included in the kit) to
the air flow switch, blower and gas valve, see
Figure 5.
Continue to next page.
Safety Precautions
ETi 400 High Efficiency Heater Combustion Blower Replacement Kit Installation Guide
Figure 3.
Figure 4.
Figure 5.
9