Pentair ETi 250 - Valves; Manual By-Pass; Automatic By-Pass

ETi 250 High Efficiency Pool and Spa Heater Installation and User’s Guide
22
VALVES
When any equipment is located below the surface of the pool or spa, valves should be placed in the circulation piping
system to isolate the equipment from the pool or spa. Check valves are recommended to prevent back-siphoning. Back-
siphoning is most likely to occur when the pump stops, creating a pressure-suction differential. Do NOT sanitize the
pool by putting chlorine tablets or sticks into the skimmer(s). When the pump is off, this will cause a high concentration
of chlorine to enter the heater, which could cause corrosion damage to the heat exchanger.
CAUTION
Exercise care when installing chemical feeders so as to not allow back siphoning of chemical into the heater, filters
or pump. When chemical feeders are installed in the circulation of the piping system, make sure the feeder outlet line
is down stream of the heater, and is equipped with a positive seal noncorrosive Check Valve, (P/N R172288), between
the feeder and heater.
MANUAL BY-PASS
Figure 17.
(*) Compare
T by observing the Temperature Pressure gauges
located inside the heater (see page 15), and the water inlet
temperature displayed on the Control Board LCD.
WARM WATER OUTLET
COLD WATER INLET
COLD
WATER
FROM POO
L
WARM WATER TO POOL
1. Set Manual By-Pass Valve.
2. Remove Handle.
ETi
250
GPM (min. / max) Max. T (°F) / Min T (°F)
30 / 120 35 / 25*
Where the water ow rate exceeds the maximum 120 GPM,
a manual bypass should be installed. After installing the
valve, adjust the valve to bring the ow rate within the
acceptable range. Then remove the valve handle or lock
it in place to avoid tampering. See Figure 17.
Table 1: Heater Water Pressure.
AUTOMATIC BY-PASS
Figure 18 shows a plumbing diagram for an automatic BY-PASS (using an IntelliValve
®
valve). This in conjunction with an
IntelliFlo VSF pump can provide added longevity of the heater and increased cost savings of operation. A 3-Port valve
with an IntelliValve actuator is installed at the heater inlet. A check valve is installed at the heater oulet so that water
cannot ow back into the heater. See instructions for Automatic Bypass valve kit (P/N 462048) for setting the open and
closed position of the IntelliValve.
Figure 18.
Installation