Raypak P-R185BL to P-R405BL - Manual (Page 20)

20
CAST IRON HEADRERS (ASME MODELS)
Heater must be located so that any water leaks will not
damage the structure of adjacent area. High temperature
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 colored gray. PVC may be used
immediately after the CPVC adapters.
DO NOT use petroleum base assembly fluids (such as
Petroleum Jelly or lubricating oil). If assembly lube is
required, use a silicon base such as Amoral etc.
There are two sets of flange gaskets supplied with your
heater. Use the appropriate gaskets for all your heater
connections. Discard unused set.
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
Fig. # 8095.1 Fig. # 8097.1
INLET/OUTLET HEADER - ASME
Header Flange
2" CPVC Adapters
PVC Pipe
ASME
Inlet/Outlet Header
Flange Gasket
Fig. # 8093.1
UNITHERM GOVERNOR OPERATION
CAUTION: NEVER install PVC directly into header
flanges. Use the 2" CPVC adapter supplied loose with
the heater.
CAUTION:
The patented Unitherm Governor is a thermostatic
mixing valve specifically designed to maintain constant
heater internal temperature between 105° to 115°F
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 100°F. It is also needed to inhibit scale
formation in the tubes by maintaining temperatures
well below accelerated scaling temperatures.
GASKET
UNITHERM
GOVERNOR
U.G. PLUG
(Polymer)