Rheem Raypak 207A Installation And Operation Manual page 28

Time Clock/Fireman's Switch
To operate the heater with a time clock, connect the timer
to the fireman's switch connection in the heater's wiring.
The time clock should be of the dual-switch type and set to
shut off the call for heat to the pool heater 15 to 20 minutes
prior to shutting down the pool pump.
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 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.
Do not exceed 50' (15 m) of total wiring using 18 AWG
stranded copper wire rated for 105°C minimum.
NOTE: When using a time clock, the 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 pressure 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
installation.
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, do the following:
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.
8. While the heater is running, check the adjustment
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.
28
Figure 52. Water Pressure Switch Assembly
MAY REQUIRE ADJUSTMENT
FOR HIGHER PRESSURE
5 ft. (1.52 m) MAX
Figure 53. 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.
CAUTION: Do not operate the heater without the
A
function of a properly adjusted water pressure switch
or flow switch.
F10671
MAY REQUIRE ADJUSTMENT
FOR LOWER PRESSURE
5 ft. (1.52 m) MAX
POOL OR SPA