Raypak 514-824 - Manual (Page 20)

PRESSURE SWITCH
The pressure switch, or heater actuator, insures that the
heater operates only when the filter pump is in operation.
It is factory set at 1.75 PSI for deck level installations.
When the heater is located below the level of the spa or
pool it may be necessary to reset the pressure switch to
compensate for the no-flow static head. If it is necessary
to reset the pressure switch, we recommend the following
procedure:
PRESSURE SWITCH ADJUSTMENT:
1. With pump and heater on, turn adjustment
knob (clockwise) until a click is heard from the
gas valve.
2. Turn adjustment knob (counter clockwise)
1/4 turn.
3. Turn pump off and on several times. Heater
should shut off immediately. If it does not,
repeat steps above until proper adjustment is
made.
ADJUSTMENT KNOB
Fig. # 8069.1
PRESSURE SWITCH ADJUSTMENT RANGE
Fig. # 8152.0
NOTE: If heater is installed outside of the limits shown,
a flow switch must be used in place of the pressure
switch when mounted and wired adjacent to the heater.
20
5' Max
5' Max
TWO SPEED PUMPS
In some cases, the flow on the low speed is insuffi-
cient to operate the heater. This is apparent when the
pressure switch cannot be further adjusted of if the heater
makes banging noises. In these cases, the pump must
be run at high speed when heating the water.
CAUTION: Do not operate the heater without the
function of a properly adjusted pressure switch.
HIGH LIMITS
The heater is equipped with two automatic high limits.
Set to operate at 135°F and 140°F.
NOTE: An erratic high limit is often characteristic of
internal heat exchanger problem, i.e. scale build-up,
U.G. operation. Refer to troubleshooting sections.
Fig. # 9275
HIGH LIMIT REMOVAL
1. Shut off main electrical power switch to heater.
2. Remove inspection panels.
3. Drain heater.
4. Remove defective high limit and replace with a
new high limit.
5. Reverse above procedure to re-install.
PILOT SAFETY
The heater employs a pilot safety which closes the
main gas valve within 8/10ths of a second whenever the
pilot flame is interrupted. Pilot flame is automatically lit
when the device is powered. Unit performs its own safety
check and opens the main valve only after the pilot is
proven to be lit.
BURNER DRAWER REMOVAL
1. Shut off main electrical power switch to heater.
2. Shut off gas upstream of heater.
3. Remove front door.
4. Disconnect gas line from gas valve.
5. Remove (2) screws that mount burner tray to
unit, and (2) screws that secure gas valve to
jacket.
6. Disconnect wires that terminate at gas valve.
7. Slide out burner tray.
8. Reverse above procedure to reinstall.