Raypak P-R185BL to P-R405BL Manuel d'utilisateur télécharger pdf (Page 21)

PRESSURE RELIEF VALVE INSTALLATION

To conform to local building codes, it may be necessary

to install a pressure relief valve. A 3/4" pressure relief

valve having a capacity equal to BTU/HR output of the

model to be installed is recommended for this heater. The

maximum acceptable pressure relief valve setting is 125

psi.

A 3/4" NPT connection is provided in the plastic header

for installation of a pressure relief valve. The valve shall be

installed in a vertical position. Do not over tighten. Install

pressure relief valve hand tight plus 1/2 turn.

POLYMER HEADER

Pressure Relief Valve

PRV Discharge

Connection

Inlet/Outlet Header

Fig. #2004

A 3/4" NPT connection is provided in the header for

installation of a pressure relief valve. The valve shall be

installed in a vertical position.

ASME HEADER

(Cast Iron)

NOTE: To avoid water damage or scalding due to valve

operation, drain pipe must be connected to valve outlet

and run to a safe place of discharge. Drain pipe must be

the same size as the valve discharge connection

throughout its entire length and must pitch downward

from the valve. No shutoff valve shall be installed

between the relief valve and the drain line. Valve lever

should be tripped at least once a year to ensure that

waterways are clear.

INTERNAL AUTOMATIC BY-PASS VALVE

In addition to the Unitherm Governor, a built-in automatic

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.

EXTERNAL AUXILIARY BYPASS VALVE

(Where Required)

An auxiliary bypass valve should be used when flow rates

exceed 125 GPM (usually a high performance pump size

larger than two horsepower will exceed this flow rate).

This valve is required to complement the function of the

automatic bypass valve, particularly when starting the

heater in winter or early spring when the spa or pool

temperature is down below 50°F. It also serves to

eliminate needless pressure drop through the heater and

accompanying reduction in the flow rate to the spa jets,

etc.

From Heater To Heater

To Pool From Pool

AUXILIARY BYPASS VALVE

(DO NOT USE GATE VALVE)

PRV Discharge

Connection

Inlet/Outlet Header

Pressure Relief

Valve

Fig. # 8095.0

Fig. # 8150.0ss

Fig.#2003

AUXILIARY BYPASS VALVE ADJUSTMENT

To set bypass: With clean filter, adjustment is made by

feeling the inlet and outlet pipes at the heater. Outlet

pipes should be slightly warmer than inlet and comfort-

able to the touch. If pipe is hot, close bypass; if cold, open

bypass.

SPRING

BYPASS DISC

BYPASS

BODY

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Raypak P-R185BL to P-R405BL Manuel d'utilisateur Page 21

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