Flow Rates; External Automatic Bypass Valve; External Auxiliary Bypass Valve; Auxiliary Bypass Valve Adjustment - Raypak X94 Installation & Operating Instructions Manual

FLOW RATES

MODEL PIPE SIZE
410 1-1/4"–1-1/2" - 2"
*When flow rates exceed maximum GPM an external auxiliary
bypass valve is required. See external auxiliary bypass valve sec-
tion for details.
Table 10: Flow Rates

EXTERNAL AUTOMATIC BYPASS VALVE

An external automatic bypass valve is provided with
the heater. The bypass valve automatically responds
to changes in water flow in the piping system. The
proper amount of water flow is maintained through the
heater under varying system flows dictated by the con-
ditions of the pump and filter.
Fig. 15: External Automatic Bypass Valve

EXTERNAL AUXILIARY BYPASS VALVE

(Where Required)
An auxiliary bypass valve should be used when flow
rates exceed 125 GPM (473.2 LPM). Usually a high-
performance pump larger than two horsepower will
exceed this flow rate. This valve is required to comple-
ment the function of the automatic bypass valve, par-
ticularly when starting the heater in winter or early
spring when the spa or pool temperature is below 50°F
(10ºC). 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
Pool/Spa
AUXILIARY BYPASS VALVE
(DO NOT USE GATE VALVE)
Fig. 16: Auxiliary Bypass Valve
MIN. GPM MAX. GPM*
40 125
(151.4 LPM) (473.2 LPM)
To Heater
From
Pool/Spa

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.

PRESSURE RELIEF VALVE PIPING

The heater is supplied with a pressure relief valve,
sized for the maximum output of the heater, and set at
125 psig. The pressure relief valve outlet must be
plumbed to a safe point of discharge.
Fig. 17: PRV Piping
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 dis-
charge connection throughout its entire length and
must pitch downward from the valve. No shut-off
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.
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