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22
CAST IRON HEADERS (ASME MODELS)
Heater must be located so that any water leaks will not
damage the structure of adjacent area. High tempera-
ture 2" plastic pipe (CPVC) may be threaded directly
into the header flanges. This is not the same as the
Schedule 80 PVC pipe which is also gray. PVC may be
used immediately after the supplied CPVC adapters.
DO NOT use petroleum-based assembly fluids (such
as petroleum jelly or lubricating oil). If assembly lube is
required, use a silicon base such as AquaLube etc.
There are two sets of flange gaskets supplied with
your heater. Use the appropriate gaskets for all your
heater connections. Discard unused set.
WARNING:
NEVER install PVC directly into header
flanges. Use the 2" CPVC adapter supplied loose
with the heater.
Fig.# 8095.1
Fig.# 8097.1
INLET/OUTLET HEADER - ASME
Flange Gasket
Header Flange
UNITHERM GOVERNOR OPERATION
CAUTION:
The patented Unitherm Governor is a thermostatic
mixing valve specifically designed to maintain con-
stant heater internal temperature between 105° and
115°F despite continually changing flow rates from
the filter and changing pool temperatures. This nar-
row range is needed to prevent damaging condensa-
tion on the burners which will occur if the heater runs
for any length of time below 100°F. It is also needed
to inhibit scale formation in the tubes by maintaining
temperatures well below accelerated scaling temper-
atures.
U.G. Plug
(Polymer)
Unitherm
Governor
Gasket
Fig.# 2011
Fig.# 8093.1
POLYMER HEADERS (STANDARD MODELS)
Before attaching the 2-inch unions to the inlet/outlet
header, make sure the O-rings are properly seated in
the grooves. Use AquaLube or equivalent non-petro-
leum-based lubricant on the O-ring. Hand tighten the
unions. Glue PVC piping directly to the unions.
INLET/OUTLET HEADER - POLYMER
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 suggested
that a check valve (or valves) also be installed in the
system.
O-Ring
Header Flange
(CPVC)
Header Flange Nut
(CPVC)
Fig.# 2002.1
GASKET DESIGN #1: Accepts 1-1/2" copper tube or
1-1/4" galvanized pipe as a slip connection.
GASKET DESIGN #2: Accepts 2" copper tube as a slip
connection. The flange is threaded for 2" screw in pipe
connections. Also used with the 2" CPVC adapters.
#1 #2
Header
Header Flange
(Supplied)
CPVC Connector
(Supplied)
Plumbing