Time Clock/Fireman's Switch; High Limits; Flow Switch; Blocked Vent Switch - Raypak X94 Installation & Operating Instructions Manual

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 6-pin header connected to the digital control board.
Splice into the red wire jumper tagged "Where neces-
sary 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 cov-
ered by warranty.
Do not exceed 50' (15.24 m) of total wiring using 18
AWG stranded copper wire rated for 105ºC (221ºF)
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.

HIGH LIMITS

The heater is equipped with two automatic high limits.
Both are located in the inlet/outlet header. Both are set
to open at 135°F (57ºC).
NOTE: An erratic high limit is often characteristic
of an internal heat exchanger problem, e.g. scale
build-up, defective bypass. Refer to Troubleshooting
section (starting on page 44).
HIGH LIMIT REMOVAL
1. Shut off main electrical power switch to heater.
2. Remove front door.
3. Remove defective high limit and replace with a
new high limit.
4. Replace inspection panel.
Fig. 30: High Limit

FLOW SWITCH

This standard, dual-purpose control, mounted and
wired in series with the main gas valve, shuts off
heater in case of pump failure or low water flow.
Fig. 31: Flow Switch

BLOCKED VENT SWITCH

This heater is equipped with a blocked vent pressure
switch to prevent the operation of the heater when the
vent is blocked.
Fig. 32: Blocked Vent Switch

ADJUSTING VALVE MANIFOLD PRESSURE

1. Gas manifold pressure is measured at the pres-
sure tap between the gas valve and gas orifice
(See Fig. 32).
2. To increase the manifold pressure and increase
the ratio of fuel to air turn the adjustment screw
counterclockwise (toward the +) (See Fig. 31). For
example, a reading of -2.0" WC (-0.5 kPa) can be
increased to -1.5" WC (-0.4 kPa) by turning the
adjustment screw counterclockwise.
manifold pressure will increase the CO
age in the flue gases.
3. To decrease the manifold pressure and decrease
the ratio of fuel to air turn the adjustment screw
clockwise (toward the -) (See Fig. 31). Decreasing
manifold pressure will reduce the CO
in the flue gases.
NOTE: Manifold pressure will decrease when the
intake air filter becomes dirty. Replace the filter
when manifold pressure drops to less than -2.5" WC
or intake suction pressure is less than -1.0" WC.
42
Increasing
percent-
2
percentage
2