Raypak 268, Installation & Operating Instructions Manual

Page: 37 / 44

Power On
Is the water
temperature displayed?
NO
YES
Push MODE
switch to select
" Pool " or " Spa "
Push Temp
arrow to scroll to
desired temperature
NO
Water temperature
and set
temperature
displayed?
YES
“ Heating ” will
display briefly
NO
NO
YES
YES
Flame icon displayed
and flashing?
OR
Water temp displayed?
(pilot lit and rectified)
Heater Fired?
END
• Check On/Off switch (under lid on control panel)
• Check for 120/240 volts to the transformer
(time clock, circuit breaker, wire connections)
• Check for 24 volts to Circuit Board (P6 connector)
“ Remote ” and Water Temperature displayed
(a remote control is controlling the heater)
Note: Disconnect the remote by turning the
remote function off. See page 30 for instructions.
NO
YES
Is a fault code displayed and flashing?
Diagnostic Readouts
“ Sensor Failure ,” “ Sensor Open ” or “ Sensor Short ” -
Temperature sensor out of range (replace sensor)
Verify power at MV on P-4 Terminal on digital circuit board.
Verify power to valve MV voltage. (Replace valve.)
“ Spark ”
Sensor Failure
Inspect thermister, wires, and connector at Terminal P1
Check resistance value of the thermister. Reference to chart below.
Replace thermister if not within 10% of values shown below.
If okay, replace Circuit Board.
Temp Degrees F 40 50 60 70 80 90 100 106
Resistance (k)
261.1 199.0 153.1 118.8 93.0 73.3 58.3 51.0
If okay, replace Circuit Board
Sensor resistance at various temperatures
“ Water Sw Open ” Water flow switch. Verify water flow and pressure
CLEAN FILTER / STRAINER - backwash if neccessary.
“ Hi Limit 1 Fault ” High limit switch. Verify water flow. Inspect internal
“ Hi Limit 2 Fault ” Thermostat (Unitherm Governor) and bypass valve.
“ Rollout Sw Open ” Rollout Sensor - Check for blocked heat exchanger and soot.
Atmospheric Units - Replace fusible link.
Lo NOx Units - Press manual reset button.
“ Clock/Fireman Sw ” Fireman or Remote switch connected to safety loop is in the
OFF mode.
“ Vent/Field Sw #1 ” Vent switch open. Check connections to the board.
If extractor installed, troubleshoot extractor.
“ Ignition Lockout ” Ignition lockout. Check power at pilot valve. Check spark (bad
ignition circuit or hi-tension wire). Verify clean pilot orifice and
clearance from igniter to ground hood.
“ Ignition Failure ” Ignition failure. Verify gas to the heater. Verify valve operation
(gas present at tube fitting).
CONTROL LOGIC - FLOW CHART
37