20
A
CAUTION:
Do not use tools to remove (twist) the
ProTek Shield Assy or the wing nut on the stud of the
ProTek Shield Assy. Non-warrantable damage may
occur.
Follow the steps below to replace the ProTek Shield Assy:
1. Shut off the pool pump and bleed pressure from the
system.
2. Close isolation valves to minimize pool/spa water
loss.
3. Remove wing nut from bottom stud on ProTek Shield
Assy.
4. Remove bonding wire ring terminal from stud.
5. Rotate ProTek Shield Assy counter-clockwise (by
hand) to unscrew it from the assembly.
6. Inspect/replace as necessary and reverse above
procedure to reinstall.
Hand tighten only!
Do not
use tools.
NOTE:
Make sure the O-ring is properly seated in the
O-ring groove before installation.
Unitherm Governor Operation
A
CAUTION:
The patented Unitherm Governor is
a thermostatic mixing valve specifically designed to
maintain constant heater internal temperature between
120°F (49°C) and 135°F (57°C) despite continually
changing flow rates from the filter and changing pool
temperatures. This range is needed to reduce the
amount of condensation from the fin tubes which will
occur if the heater runs for any length of time below
100°F (38°C) water from the pool. It is also needed to
inhibit scale formation in the tubes by maintaining
temperatures well below accelerated scaling
temperatures.
GASKET
UNITHERM
GOVERNOR
UG PLUG
UG PLUG O-RING
Figure 19. Unitherm Governor
High-temperature CPVC header flanges and header
flange nuts are provided. If there is any possibility of back-
siphoning when the pump stops, it is highly recommended
that a check valve (or valves) also be installed in the
system. It is also recommended to have a downstream ball
or gate valve to regulate heater flow and pressure.
Before attaching the 2-inch unions to the inlet/Out header,
make sure the O-rings are properly seated in the grooves.
Use Aqualube or equivalent non-petroleum-based lubricant
on the O-ring.
Hand tighten the unions
. Glue PVC piping
directly to the unions.
OUTLET
WATER
SENSOR
WATER
PRESSURE
SWITCH
HEADER
INLET
WATER
SENSOR
PROTEK
SHIELD
ASSY
Figure 17. Inlet/Outlet Header
ProTek Shield Assembly
This heater is equipped with a ProTek Shield Assembly
located horizontally on the right side of the Inlet water
connection.
This component provides protection to the heat exchanger
against galvanic corrosion, when properly bonded to the
heat exchanger. It should be replaced when the weight of
the ProTek Shield is reduced to about 40% of the original
weight (1.46 lbs.).
F10715
Figure 18. ProTek Shield Assembly
A
CAUTION:
STOP the pool pump before attempting
to remove ProTek Shield Assembly. Failure to do so may
result in damage to ProTek Shield Assy, loss of pool
water, or personal injury.
Summary of Contents for AVIA 264A
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