20
Auxiliary Bypass Valve Adjustment
To set bypass, with clean filter, adjustment is made by
feeling the inlet and outlet pipes at the heater. Outlet pipes
should be slightly warmer than inlet and comfortable to the
touch. If pipe is hot, close bypass; if cold, open bypass.
Pressure Relief Valve Installation
To conform to local building codes, it may be necessary
to install a pressure relief valve. A 3/4" pressure relief
valve, having a capacity equal to the BTU output of the
model to be installed, is recommended for this heater. The
maximum acceptable pressure relief valve setting is 125
psi (862 kPa).
A 3/4" NPT connection is provided in the Polymer header
for installation of a pressure relief valve. The valve shall be
installed in a vertical position. Do not over-tighten. Install
pressure relief valve hand tight plus 1/2 turn.
F10662
IN/OUT HEADER
PRV DISCHARGE
CONNECTION
PRESSURE RELIEF VALVE
Figure 28. Field-Supplied Pressure Relief Valve Polymer
Header (Residential Units)
A 3/4" NPT connection is provided in the header for
installation of a 75 PSI (517 kPa) pressure relief valve.
The PRV is shipped loose in the accessory carton with the
pagoda top. The pressure relief valve shall be installed in
a vertical position.
F10663
PRESSURE RELIEF VALVE
Figure 29. Pressure Relief Valve Brass Header (ASME
Models)
The heater requires water flow and positive pressure to
fire and operate properly. It must therefore be installed
downstream of the discharge side of the filter pump.
See
and
. A typical installation is
plumbed as follows:
1. The inlet side of the filter is plumbed directly to the
discharge side of the filter pump;
2.
The outlet side of the filter is then plumbed to the inlet
of the heater; and
3. The outlet of the heater is plumbed to the return line
to the pool or spa. The pump, filter and heater are
thus plumbed in series (Salt generators and chemical
feeders must be downstream of the pool heater).
Plumbing from the heater back to the pool or spa must not
have any valves or restriction that could prevent flow when
the pump is operating.
A
A
CAUTION:
An additional source of heated water,
e.g. a solar system, must be connected to the main line
ahead of the heater inlet pipe in order for it to act as
the primary heat source. If the primary system provides
adequate heat to maintain setpoint, the heater will not
fire. Be advised that the control panel will then display
sensed water temperatures downstream of the primary
heating system, rather than the temperature of the water
exiting the pool.
Heater must be located so that any water leaks will not
damage the structure of adjacent area. PVC pipe may be
glued directly into the headers unions.
Heat Exchanger Reversal
Procedure for Residential Models
1. Remove right and left side access panels. See
F10652
Figure 30. Access Panels
NOTE:
To avoid water damage or scalding due to valve
operation, drain pipe must be connected to valve outlet
and run to a safe place of discharge. Drain pipe must
be the same size as the valve discharge connection
throughout its entire length and must pitch downward
from the valve. No shut-off valve shall be installed
between the relief valve and the drain line. Valve lever
should be tripped at least once a year to ensure that
waterways are clear.
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