Pentair ETi 400 User manual

1
ETi®400
HIGH EFFICIENCY HEATER
QUICK REFERENCE GUIDE
• Control Pad Overview ............... 1
• Regular Maintenance ............... 1
• Installation Requirements........2
• Frequently Asked Questions.....3

1CONTROL PANEL OVERVIEW
Set P
oint
Controls
Digital
Display
• POOL ON: Press button to base heater operation on Pool Temperature. LED
indicates heater is responding to Pool Temperature set point.
• SPA ON: Press button to base heater operation on Spa Temperature. LED indicates
heater is responding to Spa Temperature set point.
• HEATER OFF: Press button to switch o󰀨 the heater.
• HEATING LED: Illuminates when burner is active. Blinking LED indicates heater is
calling for heat but not ring. If LED remains illuminated, but burner fails to activate,
one of the Service LEDs will illuminate and indicate a system fault.
• SERVICE SYSTEM LED: Indicates insu󰀩cient water ow through heater. Ensure lter
and skimmers are clean. If LED remains illuminated, switch OFF heater and contact a
qualied service professional.
• SERVICE HEATER LED: Indicates a fault in heater or its controls. Switch OFF heater
and contact a qualied service professional.
TO VIEW ERROR CODES:
1. Press and release POOL ON and TEMP UP buttons simultaneously. The most
recent error code will display.
2. Use the TEMP UP or TEMP DOWN buttons to scroll through the last 5 error codes.
Note: To erase an error code, press POOL ON and SPA ON simultaneously while the
heater is o󰀨.
TO VIEW STACK FLUE TEMPERATURES:
1. Press and hold the POOL ON or SPA ON button for 5 seconds. Stack Flue 1 (SF1)
temperature will display, along with a dot in the upper left corner).
2. Press the TEMP UP button to display Stack Flue 2 (SF2) temperature.
For a list of all ETi heater replacement parts, and their
associated part numbers, consult the latest Pentair product
catalog or ETi 400 Installation and User's Guide.
START OF EVERY POOL SEASON:
1. Inspect heater panels
and venting system for
restrictions to air and
exhaust ow.
2. If installed within an
enclosure, ensure enclosure
air intakes are open and
clear of obstructions.
3. Test Pressure Relief Valve.
See image to the right.
4. Test Water Pressure
Switch. Refer to the ETi
400 Installation and User’s
Guide for specic test procedures.
EVERY 12 MONTHS:
1. Have a qualied service
professional clean and vacuum
out any soot or deposits from
Heat Exchanger. If necessary,
use a biodegradable descaler
solution to break up mineral
deposits.
Inspect the heat exchanger
insulation for damage.
2. Have a qualied service
professional inspect burner
spark electrode and ame
sensor for damage.
LEVER
UPWARDS
Spark
Electrode
Flame Sensor
REGULAR MAINTENANCE
187˚F (86˚C)
Thermal Fuses Activate
170˚F (77˚C)
SFS Activates
150˚F (66˚C)
Heating Pool
140˚F (60˚C)
Heating Spa

2
MAX AIR INTAKE AND EXHAUST LINE LENGTHS
4" Pipe 120 ft
(36.3 m) −# of 90º elbows x12 ft (3.7 m) −# of 45º elbows x6 ft (1.8 m)
6" Pipe 300 ft
(91.4 m) −# of 90º elbows x12 ft (3.7 m) −# of 45º elbows x6 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
CO2O2
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).

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*476253*
P/N 476253 REV. A 7/28/20
FREQUENTLY ASKED QUESTIONS
• Which fuel does my heater use?
Inspect the heater's gas orice. The outer face of the gas orice will be marked with either
FN (Natural Gas) or NL (Propane).
• What certications does the ETi 400 meet?
The ETi heater is certied by The American Society of Mechanical Engineers (ASME). The heater
also complies with CSD-1 standard and CSA certied for ANSI Z21.56 /CSA 4.7. Certication sheets
are either included with the heater manual, or inside the packing slip attached to each heat exchanger.
• What makes the ETi 400 heat exchanger special?
The direct-re heat exchanger is made of extremely durable and highly corrosion-resistant titanium. The heat
exchanger's temperature rise is 30°F +/- 5°F (-1°C +/- 15°C).
• How e󰀩cient is the ETi 400 heater?
The ETi 400 has one of the highest thermal e󰀩ciencies in the pool industry. 96% of the heat generated during the
combustion process is transferred directly to pool water. This high e󰀩ciency improves your heat up time and reduces
your energy cost as shown by the formulas below:
3
TIME =Pool/Spa Volume X8.34 X ΔT
Heater BTU X 0.96
ENERGY
COST =Heater BTU XTime
100,000 X Gas Price
Time: Hours required to heat pool
Pool/Spa Volume: Volume of pool in gallons
ΔT: Desired temperature rise
Heater BTU: Heater BTU rating
Gas Price: Local gas price (therm/dollar)
• Will the outside of my heater become hot?
Thanks to the heater's high e󰀩ciency most of the heating capacity goes directly into your pool, but a small amount is expelled
as exhaust. This means the heater's plastic and metal outer surfaces remain close to room temperature.