19
30-09-04
155 Model Only
Inlet/Outlet Header
DAN MAINES
Flange Gasket
Header Flange
S80
1
2
There are two sets of flange gaskets supplied with
your heater. Use the appropriate gaskets for all your
heater connections. Discard unused set.
DESIGN 1: Accepts 1½" copper tube or 1¼"
galvanized pipe as a slip connection.
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.
185, 265 & 405 Models Only
Ensure the O rings are properly seated before
tightening hand tight. They maybe lubricated with
silicone grease. Glue plastic pipe directly in to the
unions.
UNITHERM GOVERNOR OPERATION
Does not apply to 105 Model
The patented Unitherm Governor is a thermostatic
mixing valve specifically designed to maintain con-
stant heater internal temperature between 40.6 to
46.1°C despite continually changing flow rates from
the filter and changing pool temperatures. This
narrow range is needed to prevent damaging
condensation on the burners which will occur if the
heater runs for any length of time below 37.8°C. It is
also needed to inhibit scale formation in the tubes by
maintaining temperatures well below accelerated
scaling temperatures.
INTERNAL AUTOMATIC BY-PASS VALVE
Does not apply to 055 Model
In addition to the Unitherm Governor, a built-in auto-
matic by-pass valve is provided in the in/out header.
While the Unitherm Governor responds to the
changes in water temperature in the heater, the
internal by-pass valve automatically responds to
changes in water pressure in the piping system.
Proper amount of water flow is maintained through
the heater under varying pressures dictated by the
conditions of the pump and filter.
055 Models Only
055hdr.tif
Inout.tif
gasket.tif
IN
OUT
IN
OUT
105 Model Only
The 105 accepts direct connection to 1
½" plastic pipe
using the adapters provided.
105 headers.tif
Inlet/Outlet Header
1
½" NPT
Inlet/Outlet
Connections
ugov.tif