Temperature Controls; External Auxiliary Bypass Valve; Auxiliary Bypass Valve Adjustment - Raypak raytherm p-1826 Installation & Operating Instructions Manual

External Auxiliary Bypass
Valve (Where Required)
926-1223 Models Only
An auxiliary bypass valve should be used when flow
rates exceed 100 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 heat-
er and accompanying reduction in the flow rate to the
spa jets, etc.
Fig. 23: Auxiliary Bypass Valve
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.
NOTE: Do not use a gate valve as an auxiliary
bypass valve on any heaters.
Models 926-1223 with UG
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 100 gpm and adjusted as below.
NOTE: Sooting or liming caused by improper
bypass adjustment voids the warranty.
Open Position
Fig. 24: Manual Bypass Valve on UG models
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.

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.
Poolstat
The pool heater is equipped with a poolstat that is
attached to the inlet side of the in/out header to control
the pool temperature.
18
Bypass Valve
Closed Position