Pentair ETi 400 - Page 3

2
MAX AIR INTAKE AND EXHAUST LINE LENGTHS
4" Pipe
120 ft
(36.3 m)
−
# of 90º elbows
x
12 ft
(3.7 m)
−
# of 45º elbows
x
6 ft
(1.8 m)
6" Pipe
300 ft
(91.4 m)
−
# of 90º elbows
x
12 ft
(3.7 m)
−
# of 45º elbows
x
6 ft
(1.8 m)
Note: All horizontal sections must slope towards the heater 1/4" per foot. This
allows condensate to drain through the neutralizer cartridge properly.
VENTILATION REQUIREMENTS
• Schedule 40 PVC.
Schedule 80 CPVC
and stainless steel are
all approved venting
materials. PVC joints
must be glued in
compliance with National
Fuel Gas Code.
• If installed within an
enclosure and vented
outside, the termination
cap provided with the heater must be used.
If venting vertically, the termination cap may require a rain cap (not
provided).
AIR INTAKE REQUIREMENTS
• Max combustion intake length matches max venting length
caculated above.
• Intake and exhaust pipes must be minimum of 36"
(91.4 cm) apart.
• If using 4" pipe, Combustion Air Intake Kit (P/N 475971
-- sold separately) MUST be installed. Refer to the ETi
400 Installation and User’s Guide for specic installation
procedures.
INSTALLATION REQUIREMENTS
Air Intake
Flue Exhaust
Air Intake Kit
(P/N 475971)
WATER FLOW REQUIREMENTS
• Front and back outer panels can be swapped,
allowing water connections to be oriented as
needed.
• To reduce ow rates, an external bypass valve is
required when water ow is above 120 GPM.
GAS REQUIREMENTS
• Bottom panels and internal gas valve can be swapped, allowing gas inlet to be
oriented as needed.
• Gas Supply Requirements
MIN MAX
NATURAL GAS 4" WC 10.5" WC
PROPANE 4" WC 12" WC
Note: Maximum pressure change should not exceed 2" WC. Minimum running pressure
should not fall below 4" WC.
• Max Gas Supply Line Length
3/4" 1" 1-1/4" 1-1/2"
NATURAL GAS N/A 20 ft (6.1 m) 90 ft (27.4 m) 200 ft (61 m)
PROPANE 20 ft (6.1 m) 60 ft (18.3 m) 220 ft (67.1 m) 450 ft (137.2 m)
• Combustion Parameters
CO
2
O
2
NATURAL GAS 7.8 - 9.2% 4.8 - 7.2%
PROPANE 9.6 - 10.2% 5.4 - 6.3%
OTHER INSTALLATION REQUIREMENTS
• 15 Amp Circuit Required.
• Heater produces 2-4 gallons (7.6 - 15.1 L) of condensate per hour. Condensate
neutralizers are not always required, but we strongly recommend installing a
Condensate Neutralizer Kit (P/N 475612).