28 USE ONLY GENUINE REPLACEMENT PARTS
NORMAL OPERATION FOR POOL & SPA MODES: The control continually compares the water temperature with the set point
and the high limit temperature. When the water temperature is more than 1°F below the set point a call for heat is generated and a
heating cycle is initiated.
1. The control checks for open contacts at the blower vacuum switch.
2. The control energizes the blower and the igniter. The igniter heat-up time is approximately 20 seconds. The blower is running a
pre-purge cycle during this time.
3. The control checks for closed contacts at the blower vacuum switch.
4. When the igniter reaches the proper temperature a 4-second trial for ignition begins. The control opens the gas valve and
monitors flame current. The igniter is turned off when flame is sensed or after 4 seconds.
5. The blower vacuum switch, temperature limit switches, vent pressure switch, water pressure switch, the water temperature
sensor, and the flame sensor are constantly monitored during a call for heat to assure the heater is operating properly.
6. When the thermostat is satisfied and the call for heat ends the control immediately de-energizes the gas valve.and flame
extinguishes.
7. The control operates the blower during a 30-second post-purge period.
FAHRENHEIT OR CELSIUS: The temperature can be displayed in Fahrenheit or Celsius. To change the display, use the “MODE”
button to place the heater in “STANDBY”. Then press and hold the “( + )” and “MODE” buttons until the display shows the °F/°C
selection. Press the “( - )” button to toggle between selections. To accept the selection, press the “MODE” button. If the user does
not act, the selection will be automatically accepted after 60 seconds.
TEMPERATURE ADJUSTMENT: This control allows the user to have 2 individual pre-set temperature settings, “SPA” and “Pool”.
To adjust the temperature while in “SPA” or “POOL” mode, use the ( + ) and ( - ) buttons. The numeric display will flash while the
temperature is being adjusted. When the numeric display is not flashing, the actual measured water temperature is being displayed.
The temperature settings for both “SPA” and “POOL” modes are initially set at the factory to 65°F. The minimum allowed settings for
“SPA” and “POOL” modes are both 65°F. The maximum allowed settings for “SPA” and “POOL” modes are adjustable up to 104°F
using the TEMPERATURE MAXIMUM SET POINT feature (see below).
TEMPERATURE MAXIMUM SET POINT: The digital thermostat in this pool heater allows the user to lock the maximum
temperature setting allowed. This feature is useful for preventing unauthorized users from manually adjusting the temperature
settings higher than desired. On a new heater, the maximum allowed temperature lock settings are initially set at the factory to 90°F
for “POOL” mode, and 104°F for “SPA” mode. To adjust these settings, use the following procedure:
1. Use the MODE button to put the heater in “STANDBY” mode.
2. Press and hold both the ( + ) and ( - ) buttons at the same time.
3. After 3 seconds, the thermostat enters maximum temperature lock adjustment mode.
4. The “SPA” indicator light illuminates and the numeric display shows the current “SPA” mode maximum temperature lock
setting. Both the “SPA” indicator light and the numeric display flashes rapidly when in adjustment mode.
5. Use the ( + ) and ( - ) buttons to set the desired maximum temperature lock setting. When finished, press the MODE button.
6. The “POOL” indicator light illuminates and the numeric display shows the current “POOL” mode maximum temperature lock
setting. Both the “POOL” indicator light and the numeric display flashes rapidly when in adjustment mode.
7. Use the ( + ) and ( - ) buttons to set the desired maximum temperature lock. When finished, press the MODE button.
8. The heater will return to “STANDBY” mode
FAILURE TO LIGHT – RETRY: If the first ignition attempt fails during a normal heating cycle the control will make two (2) additional
ignition attempts:
1. The control de-energizes the gas valve after the 4-second ignition trial ends.
2. The control operates the blower during a 30-second post-purge period.
3. The control monitors for open contacts at the blower vacuum switch.
4. The control performs a gas valve relay check.
5. A normal ignition sequence resumes with Item #2 in NORMAL OPERATION FOR POOL & SPA MODES (see above). If the
third ignition trial fails the control enters a safety lockout (or “hard” lockout) after the post purge period of the third failed trial.
6. The error code “IF” is displayed and the “SERVICE” indicator is illuminated.
a. The control automatically resets and clears the “IF” error code without any user intervention after60 minutes. If there is a
call for heat after reset, the control will make three (3) trials for ignition. If ignition is not established the control will again
enter safety lockout for 60 minutes. This cycle will continue until ignition is established or the call for heat is removed.
b. The user can reset the control and clear the “IF” error code by pressing the “MODE” button to move through “STANDBY”
and return to the previous mode (“POOL” or ”SPA”).
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