Return The Heater To Service; Maintaining Pool Temperature; Energy Saving Tips - Pentair ETi 400 Instructions D'installation

Section 4: Maintenance and Care
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6. Drain the plastic inlet/outlet manifold through the outlet pipe. If the pipe does not drain naturally to the pool, install a drain
cock in the outlet pipe to drain the manifold.
7. Use a blower to remove all remaining water in the heater.
8. Cover air inlet grate with a plastic bag to prevent bugs, leaves, etc., from getting into the heater.
NOTICE: Water trapped in the heater can cause freeze damage. Allowing the heater to freeze voids
the warranty.

RETURN THE HEATER TO SERVICE

To return the heater to service after winterizing:
1. Connect the INLET and OUTLET unions to the system plumbing, see page 16. Check that they are connected correctly and
there are no water leaks.
2. Reinstall the two WATER PRESSURE SWITCHES in the CPVC plumbing inlet assembly, see page 16
3. Place the DRAIN PLUG back into the port at the manifold assembly.
4. Before starting the heater, circulate water through the heater for several minutes until all air noises stop. See also BEFORE
START-UP (page 12) and CARE AND MAINTENANCE (page 53).
See additional notes under Important Notices in Introduction page 12.

MAINTAINING POOL TEMPERATURE

To maintain pool temperature, make sure that the heater switch and valving are reset to pool settings after using the spa.

ENERGY SAVING TIPS

1. Keep the pool or spa covered when not in use. This will reduce heating costs, reduce water evaporation, conserve
chemicals and reduce load on the filtering system.
2. Reduce pool thermostat to 78° F (25° C) or lower; reduce spa temperature to 100° F (38° C). This is accepted as being
the most healthy temperature for swimming by the American Red Cross.
3. Use a time clock to start the filter pump at 6 a.m. or later. The swimming pool loses less heat after daybreak.
4. For pools used only on weekends, lower the thermostat setting by 10° F to 15° F (5° C to 8° C) during the week to
reduce heat loss. A properly sized heater will restore normal temperature within one day.
5. Turn the heater off when the pool will not be used for an extended period.
6. Follow a regular program of preventive maintenance for the heater each new swimming season. Check operation of
the heater and its controls.
ETi 400 High Efficiency Pool and Spa Heater Installation and User's Guide Rev. C 4/2017