Raypak P-926, P-1826, P-2100, P-4001 Installation And Operating Instructions Manual page 14

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 function 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 accompa-
nying reduction in the flow rate to the spa jets, etc.
FROM
HEATER
TO POOL
AUXILIARY BYPASS VALVE
(DO NOT USE GATE 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
The heater is also equipped with a manual bypass built
into the header. This is in addition to the automatic
bypass valve. This may be used with flow rates up to
120 GPM and adjusted as below.
NOTE: Sooting or liming caused by improper bypass
adjustment voids the warranty.
TO
HEATER
NOTE: To avoid water damage or scalding due to valve
TO POOL
operation, drain pipe must be connected to valve outlet
Fig. #8150
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.
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.
LOW WATER CUT-OFF
Automatically shuts down burner whenever water level
drops below probe. 30 second time delay prevents
premature lockout due to temporary conditions such as
power failure or air pockets. Standard on Cal Code
heaters.
14
BYPASS VALVE
OPEN POSITION CLOSED POSITION
MANUAL BYPASS ADJUSTMENT
INLET/OUTLET
HEADER
Fig. #8223.0
Fig. #8222.0
Fig. #6043