PENTAIR ETI 400 (02) PDF Document

The control panel buttons on your PENTAIR ETI 400 have the following functions:

POOL ON: Press this button to base heater operation on the Pool Temperature. The LED indicates the heater is responding to the Pool Temperature set point.

SPA ON: Press this button to base heater operation on the Spa Temperature. The LED indicates the heater is responding to the Spa Temperature set point.

HEATER OFF: Press this button to switch off the heater.

TEMP UP / TEMP DOWN: These are the Set Point Controls.

The indicator LEDs on your PENTAIR ETI 400 control panel signify the following:

HEATING LED: Illuminates when the burner is active. A blinking LED indicates the heater is calling for heat but not firing. If the LED remains illuminated, but the burner fails to activate, one of the Service LEDs will illuminate and indicate a system fault.

SERVICE SYSTEM LED: Indicates insufficient water flow through the heater. Ensure the filter and skimmers are clean. If the LED remains illuminated, switch OFF the heater and contact a qualified service professional.

SERVICE HEATER LED: Indicates a fault in the heater or its controls. Switch OFF the heater and contact a qualified service professional.

To view error codes on your PENTAIR ETI 400, follow these steps:

1. Press and release the POOL ON and TEMP UP buttons simultaneously. The most recent error code will be displayed.

2. Use the TEMP UP or TEMP DOWN buttons to scroll through the last 5 error codes.

To erase an error code on your PENTAIR ETI 400, press the POOL ON and SPA ON buttons simultaneously while the heater is off.

Follow these steps to view the stack flue temperatures:

1. Press and hold the POOL ON or SPA ON button for 5 seconds. The Stack Flue 1 (SF1) temperature will display, along with a dot in the upper left corner.

2. Press the TEMP UP button to display the Stack Flue 2 (SF2) temperature.

The following are key temperature thresholds:

140°F (60°C): Heating Spa

150°F (66°C): Heating Pool

170°F (77°C): SFS Activates

187°F (86°C): Thermal Fuses Activate

At the start of every pool season for your PENTAIR ETI 400, perform the following maintenance:

1. Inspect heater panels and the venting system for restrictions to air and exhaust flow.

2. If installed within an enclosure, ensure enclosure air intakes are open and clear of obstructions.

3. Test the Pressure Relief Valve.

4. Test the Water Pressure Switch. Refer to the ETi 400 Installation and User’s Guide for specific test procedures.

Every 12 months, the following maintenance should be performed by a qualified service professional:

1. Clean and vacuum out any soot or deposits from the Heat Exchanger. If necessary, use a biodegradable descaler solution to break up mineral deposits. Inspect the heat exchanger insulation for damage.

2. Inspect the burner spark electrode and flame sensor for damage.

The maximum line lengths are calculated based on the pipe size and the number of elbows used.

For 4″ Pipe: Start with 120 ft (36.3 m), then subtract 12 ft (3.7 m) for each 90° elbow and 6 ft (1.8 m) for each 45° elbow.

For 6″ Pipe: Start with 300 ft (91.4 m), then subtract 12 ft (3.7 m) for each 90° elbow and 6 ft (1.8 m) for each 45° elbow.

Note: All horizontal sections must slope towards the heater 1/4″ per foot. This allows condensate to drain through the neutralizer cartridge properly.

Schedule 40 PVC, Schedule 80 CPVC, and stainless steel are all approved venting materials. PVC joints must be glued in compliance with the 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).

The maximum combustion intake length matches the maximum venting length calculated.

Intake and exhaust pipes must be a minimum of 36″ (91.4 cm) apart.

If using a 4″ pipe, a Combustion Air Intake Kit (P/N 475971 – sold separately) MUST be installed. Refer to the ETi 400 Installation and User’s Guide for specific installation procedures.

The PENTAIR ETI 400 has the following water flow requirements:

Minimum: 40 GPM

Ideal: 60-80 GPM

Maximum: 120 GPM

Front and back outer panels can be swapped, allowing water connections to be oriented as needed.

To reduce flow rates, an external bypass valve is required when the water flow is above 120 GPM.

Bottom panels and the internal gas valve can be swapped, allowing the gas inlet to be oriented as needed.

Gas Supply Requirements

Note: Maximum pressure change should not exceed 2″ WC. Minimum running pressure should not fall below 4″ WC.

Max Gas Supply Line Length

Combustion Parameters

A 15 Amp Circuit is Required.

The 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).

To determine the fuel type for your PENTAIR ETI 400, inspect the heater’s gas orifice. The outer face of the gas orifice will be marked with either FN (Natural Gas) or NL (Propane).

The PENTAIR ETI 400 heater is certified by The American Society of Mechanical Engineers (ASME). The heater also complies with CSD-1 standard and is CSA certified for ANSI Z21.56 /CSA 4.7. Certification sheets are either included with the heater manual or inside the packing slip attached to each heat exchanger.

The direct-fire heat exchanger in the PENTAIR ETI 400 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).

The PENTAIR ETI 400 has one of the highest thermal efficiencies in the pool industry. 96% of the heat generated during the combustion process is transferred directly to the pool water. This high efficiency improves your heat-up time and reduces your energy cost as shown by the formulas below:

TIME = (Pool/Spa Volume X 8.34 X ΔT) / (Heater BTU X 0.96)

ENERGY COST = (Heater BTU X Time / 100,000) X Gas Price

Where:

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)

Thanks to the PENTAIR ETI 400 heater’s high efficiency, most of the heating capacity goes directly into your pool, with only a small amount expelled as exhaust. This means the heater’s plastic and metal outer surfaces remain close to room temperature.