Raypak 405B Operations Instructions download pdf (Page 20)

CONNECTIONS (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)

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Raypak 405B Operations Instructions Page 20

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