Lochinvar GAS HEATER FOR COMMERICAL POOL APPLICATIONS - Manual (Page 40)

Commercial Pool Heaters
40
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