9: System Operation - FAFCO 500 Series Installation Manual

POTENTIAL PUMP DAMAGE
If the circulation module is turned on
by this controller when no water is in
the system the pumps can be
permanently damaged.
Controller Features:
1. Sensor Error Codes
2. Temperature Display Button
3. Continuous Digital Display of Water Storage
Tank Temperature
4. Solar Switch
5. Max Water Temp Switch
6. Solar On Light
Controller Operation:
The system operates automatically, continuously displaying the upper tank WATER TEMPERATURE. The system will
activate whenever the roof temperature is at least 10 hotter than the lower tank temperature. The system will continue
to operate automatically until the tank reaches the selected MAX WATER TEMP or the roof temperature is only 4 de-
grees hotter than the lower tank temperature. At that time, the system will shut-off automatically, the green SOLAR ON
light will go off, and the WATER TEMPERATURE will continue to be displayed. The system will reactivate whenever
the roof temperature is at least 10 hotter than the lower tank temperature.
Solar Setting:
The SOLAR switch is normally set in the AUTO position, and should remain set this way for automatic operation. The
TEST position is normally for installation and maintenance purposes only and should only be used to test the system.
The OFF position is for maintenance only.
Maximum Tank Temp Setting:
This switch permits the user to set a maximum storage tank water temperature. This will depend on household
requirements or safety concerns. If the water reaches the set maximum temperature during solar operation, the solar
system will shut off automatically. Optional maximum temperature settings are 120° F, 135° F and 150° F.
Temperature Display:
The upper tank temperature is continuously displayed. View other temperatures by pressing the TEMP DISPLAY
push button. "U", "L" or "r" will be displayed representing the upper tank, lower tank or roof, followed by the tempera-
ture. Display will revert back to upper tank temperature after a short time period.
Sensor Monitoring:
A faulty or disconnected UPPER TANK, LOWER TANK or ROOF sensor will be indicated by the display flashing SE-
U, SE-L or SE-r. The system will automatically shut off, and the display will flash until the sensor has been repaired,
replaced or re-connected.
System Self Monitoring
The system continuously monitors for water temperature increase while the pumps are operating. If the controller
senses the water is not heating after 4 hours of system operation, the system will shut off and display "FLO" indicating
the water or heat transfer fluid is not flowing properly through the system. Contact your installer for system evaluation
and repair.
Operating Indicators
To determine if the system is operating properly and providing solar heated water, verify the top tank water temperature
is warm. For single tank systems, verify the top tank water temperature is higher than lower tank water temperature
when the system is activated.
The control component of your FAFCO solar water heating system features
state-of-the-art microprocessor technology and many flexible features to maxi-
mize the effectiveness and utility of your solar water heating system, with special
emphasis on "user friendliness" and reliability for years to come.
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