Isolation And Check Valves; Manual Bypass Valve; Pressure Relief Valve (Prv) - Pentair ULTRATEMP ETi 220 Installation And User Manual

8

Isolation and Check 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.
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 Valve
Where the water flow rate exceeds the maximum
120 GPM, a manual bypass should be installed. After
installing the valve, adjust the valve to bring the flow
rate within the acceptable range. Then remove the
valve handle or lock it in place to avoid tampering.
Lower Gas Engine
Pressure Relief
Valve (Installed)
ULTRATEMP ETI™ Hybrid Heater Installation and User's Guide
Figure 10
Manifold Plug
Figure 11

Pressure Relief Valve (PRV)

Explosion hazard! Any heater installed
with restrictive devices in the piping system
downstream from the heater, (including check valves, isolation valves,
flow nozzles, or therapeutic pool valving), must have a relief valve
installed as described in this section.
Canadian code, and some U.S. local codes, may
require installation of a Pressure Relief Valve (PRV).
Purchase and install a Hybrid Pressure Relief Valve
Kit (P/N 475943) complying with the ANSI/ASME
Boiler and Pressure Vessel Code, having a capacity
equal to the Btu/hr rating of the heater.
Note: The relief pressure of the valve MUST NOT
EXCEED 50 PSI. The relief valve must be installed
vertically.
To install the pressure relief valve:
Note: Be sure to use threaded seal tape (PTFE) or
equivalent, on all threaded metal pipe connections.
1. Remove the heater service panel.
2. Remove the lower gas engine manifold 3/4" brass
plug. See Figure 10.
3. Thread the Schedule 40 brass pipe and 45-degree
elbow [1], included in the PRV kit, into the lower
gas engine manifold. The elbow should be oriented
so that the elbow's female thread is horizontal. See
Figure 11.
4. Thread the second Schedule 40 brass pipe and
90-degree elbow [2] into the 45-degree elbow [1].
Ensure that the open end of the 90-degree elbow is
oriented vertically. See Figure 11.
5. Install the Pentair pressure relief valve (P/N
072138), included in the PRV kit, or an equivalent
50 PSI 3/4" ASME-Type IV relief valve [3] into the
90-degree elbow [1]. See Figure 11.
Note: Ensure the relief valve is oriented so the
outlet is facing straight into the heater and will not
direct towards the service panel.
6. Inspect the valve annually to ensure proper
operation. Replace if improper operation is
determined.