Raypak RAYTHERM P-926 - Manual (Page 18)

18
External Auxiliary Bypass
Valve (Where Required)
926-1223 Models Only
An auxiliary bypass valve should be used when flow
rates exceed 120 gpm (usually a high performance
pump size larger than two HP will exceed this flow
rate). This valve is required to complement the func-
tion of the automatic bypass valve, particularly when
starting the heater in winter or early spring when the
spa or pool temperature is below 55°F. It also serves
to eliminate needless pressure drop through the
heater and accompanying reduction in the flow rate to
the spa jets, etc.
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.
Models 926-1223
The heater is also equipped with a manual bypass
built into the header. This is in addition to the automat-
ic bypass valve. This may be used with flow rates up
to 120 gpm and adjusted as below.
Temperature Controls
High Limits
The pool heater is equipped with two high limits. Both
high limits, the non-adjustable auto reset high limit and
adjustable manual reset high limit are attached to the
outlet side of the in/out header.
Pool Stat
The pool heater is equipped with a pool thermostat
that is attached to the inlet side of the in/out header to
control the pool temperature.
From Heater To Heater
To Pool From Filter
Fig. 23: Auxiliary Bypass Valve
NOTE: Do not use a gate valve as an auxiliary
bypass valve on any heaters.
NOTE: Sooting or liming caused by improper
bypass adjustment voids the warranty.
Bypass Valve
Open Position Closed Position
Fig. 24: Manual Bypass Valve
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 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.