FAFCO 500 Series Installation Manual page 24

8: System Start-up (Continued)
STEP 2: ATTACH POWER CORD
Before ICM power cord attachment using the toggle switches on the top of the circuit
board, set the SOLAR switch to OFF and the MAX WATER TEMP switch to 120 °F.
Route the power/ground cord into the ICM next to the lower left flexible hose. Attach
the ground wire to the terminal marked ground in the lower left corner of the circuit
board. This grounding wire also provides lightning protection for the system. Route the
power cord behind the lower pump from left to right and plug the power cord into the
jack in the lower right corner on the back of the circuit board.
STEP 3: ATTACH SENSOR WIRES TO ICM
Route the three sensor wire pairs into the ICM next to the lower left flexible hose.
Connect the three sensor wire pairs to their respective terminals: Upper Tank Sen-
sor, Lower Tank Sensor, and Roof Sensor. Note: There is no positive or negative.
Use cable ties to secure the ground, power and sensor wires to the circuit board
standoff post. Plug the power supply into the wall outlet. The water temperature in
the water heater or solar storage tank will be displayed. If any of the sensor wires
is not securely fastened in the terminal, a fault code will be displayed instead of the
temperature. Note: The fault codes are SE-r (Sensor Error) for the roof, SE-U for
the upper tank sensor and SE-L for the lower tank sensor.
STEP 4: TEST THE SYSTEM
Move the SOLAR switch to the TEST position to turn the pumps on. The green
SOLAR ON light will illuminate. Verify both pumps are operating. If the pumps are
not flowing, ensure there is no air trapped in the lines. Raise the outlet side of the
solar collector off the roof to allow any trapped air to escape. Ensure the reservoir
is installed at the highest point in the system and there are no other high spots
that can trap air in the system. The TEST mode has a 4 hour time-out feature
that shuts the pumps off and the display will flash tESt. The pumps can be restarted by moving the switch to the OFF
position until the display stops flashing tESt, then move the switch back to the TEST position.
STEP 5: VERIFY TEMPERATURES
The upper tank temperature is continuously displayed. View other temperatures by
pressing the TEMP DISPLAY push button. "U", "L" or "r" will be displayed represent-
ing the upper tank, lower tank or roof, followed by the temperature. In TEST mode
the last temperature viewed will continue to be displayed until the TEMP DISPLAY
button is pressed.
STEP 6: ACTIVATE SYSTEM
Move the switch to the AUTO position to put the system into automatic operation
mode. The upper tank temperature will display continuously, lower tank or roof tem-
perature can be viewed by pressing the TEMP DISPLAY button. Display will revert
back to upper tank temperature after a short time period.
STEP 7: REPLACE ICM COVER
Gently place the cover on the ICM. Route all sensor and power wires through the
opening on the left side of the cover behind the flexible hose. Push the cover on
until the four side tabs engage.
23