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Commercial Pool Heaters
OPERATION Continued
Figure 44 – Vertical Pool Heater Piping
Figure 45 – Horizontal Pool Heater Piping
OPERATING TEMPERATURE CONTROL
The pool heater is equipped with a microprocessor based adjustable
digital temperature control to provide ON/OFF operation. The
temperature control is located behind the overlay on the front of
the control panel. Operation is based on temperature inputs from
immersion sensors, and, if desired, an external thermostat. The
temperature control will turn on and off based upon the
temperature measured by the pool return sensor. This sensor is
factory installed in a bulbwell located in the inlet piping to the pool
heater, upstream of the 3-way automatic bypass valve. The
temperature control will turn on and off based upon an external
thermostat connected between terminals R1 and W1 on the
terminal board. The temperature control will also turn off if the
temperature measured by the pool heater output sensor exceeds a
limit (default = 200°F) or if the temperature measured by the
optional pool supply sensor exceeds another limit (default = 100°F).
In addition, the temperature control will operate a factory installed
3-way automatic bypass valve. This is done to maintain a minimum
temperature at the inlet to the pool heater (default = 130°F),
automatically protecting the pool heater from condensation of the
flue products. If the boiler inlet temperature is not satisfied within
15 minutes the controller will shut the unit down. To reset the unit,
press any key. No manual valve adjustments are required.
An LCD is provided to display various readings and operating
parameters. Three (3) pushbuttons are available to change the
display and to program parameters (Figure 46).
Figure 46 – Temperature Control Display and Programming
Keys
Specifications
• Set Point Adjustment Range:
OFF, 55°F up to 105°F (13°C up to 41°C).
• Differential Adjustment Range:
1°F up to 20°F (1°C-11°C)
• Temperature Accuracy: +/- 1°F.
• Display Resolution: 1°F via Liquid Crystal Display (LCD).
• Sensor: NTC Thermistor, 10k ohms @ 77°F (25°C).
• Operating Humidity: < 90% RH Non-condensing.
• Operating Ambient Temperature:
-20° to 140°F (-30° to 60°C).
The programming keys are as follows:
Select - Allows the user to select the reading or parameter being
displayed. Each time the key is pressed, a different indicator will
appear which describes the value being shown. These are detailed
as follows:
Up and Down Arrows - While in the Adjust mode, the user can
increase or decrease the parameter being shown.
The default display mode is the View mode, indicated in the upper
right-hand corner of the display.
The default value shown is the Pool Temperature, indicated by the
arrow pointing to the POOL text on the overlay. If the pool return
sensor has been installed and connected, this will be the
temperature of the water coming from the pool.
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