Raypak 406A Installation And Operation Manual page 32

For millivolt heaters, the fireman's switch connection is
a wire nut located in the Violet/Black wiring between the
manual toggle switch and the gas valve. heaters, splice
into the red/white wire to connect the time clock.
For digital heaters, the fireman's switch connection is
located on the 14-pin header connected to the digital
control board. Splice into the red wire jumper tagged –
Where necessary add "Fireman's" switch circuit here – to
connect the time clock.
The fireman's switch connection on both millivolt and
digital heaters must be a dry contact and must not
supply power to the heater. Powering the fireman's
switch connection externally may damage the heater,
and is not covered by warranty.
Millivolt heaters: Do not exceed 15 ft (4.5 m) of total wiring
using 14 AWG stranded copper wire rated for 105°C
minimum.
Digital heaters: Do not exceed 50 ft (15 m) of total wiring
using 18 AWG stranded copper wire rated for 105°C
minimum.
NOTE: When using a time clock, the digital heater will
display "Clock/Fireman Sw" when the fireman's switch
is open, indicating that the time clock has shut off the
call-for-heat.
Water Pressure Switch
The water flow switch ensures that the heater operates
only when the filter pump is in operation. It is located on the
In/Out header. It is factory-set at 1.75 PSI for deck-level
installations.
Water Pressure Switch Adjustment
When the heater is located below the level of the spa or
pool, it may be necessary to adjust the pressure switch to
compensate for the no-flow static head. If it is necessary
to adjust the water pressure switch, utilize the following
procedure:
1. Make sure the pool filter is clean before adjusting the
switch.
2. Set the heater control to the OFF mode.
3. Turn the filter pump ON and confirm that the pressure
switch is closed (use a multimeter to check). If the
pressure switch fails to close, either the switch setting
is too high or not enough pressure is being supplied
by the filter pump.
4. Turn the heater ON.
5. Manually turn the pressure adjustment knob clockwise
until the heater shuts off. (A flat screwdriver may be
necessary if knob is too tight.)
6. Slowly turn the adjustment knob counter-clockwise
until the heater calls for heat again.
7. Turn an additional 1/2 turn counter-clockwise.
32
PRELIMINARY
8. While the heater is running, check the adjustment
Figure 57. Water Pressure Switch Assembly
MAY REQUIRE ADJUSTMENT
FOR HIGHER PRESSURE
5 ft. (1.52 m) MAX
Figure 58. Pressure Switch Adjustment Requirements
Two-Speed Pumps
In some cases, the flow on the low-speed is insufficient
to operate the heater. This is apparent when the water
pressure switch cannot be further adjusted or if the heater
makes banging noises or shuts off on high limit. In these
cases, the pump must be run at high speed when heating
the water.
UNCONTROLLED DOCUMENT IF PRINTED
by turning the pump off and on several times. The
burners should shut off immediately when the pump
is turned off. If it does not, repeat the above steps
until proper operation is observed.
POOL OR SPA
F10671
MAY REQUIRE ADJUSTMENT
FOR LOWER PRESSURE
5 ft. (1.52 m) MAX