Maintenance
7-3
“Y” Strainer
“Y”strainer flush
•
The “Y” strainer (1-1) requires regular maintenance every time system is set up or 1000
hours of operation.
•
Remove the end plug from the end of the strainer outlet valve (1-2).
•
Position a 5-gallon container at the outlet valve.
•
With the pump running, crack the strainer valve a number of times. A quick on/off
action of the valve will provide the short bursts required to backwash and clean the
strainer. The removal of a couple of gallons of heat transfer fluid should be adequate.
NOTE: Be certain not to run the reservoir empty, as this would allow air to enter the
system.
•
The extracted heat transfer fluid can be reused. Before pouring the fluid back into the
reservoir, the fluid must be filtered to remove impurities. Filtering the fluid through a
cotton cloth or paper is adequate.
“Y”strainer screen cleaning procedure
•
Clean the screen (2-1) located inside the “Y” strainer prior to every installation.
•
Remove the end plug from the end of the strainer outlet valve (1-2).
•
Position a container at the outlet valve. A couple of 5 gallon containers should do.
•
With the pump “off”, drain off the “HTF” until there is no more flow.
•
Remove the top of the “Y” strainer and extract the screen (2-1)
•
The screen should be cleaned using warm water and a soft bristled brush.
•
Reassemble and ensure that all fittings are tight
•
The extracted heat transfer fluid can be reused.
•
Air will have to purged from the system. Refer to “Operation, Purging Air from
the “HTF” Circulation System” for instructions.
Temperature Control
•
Verify the operation of the temperature control by checking the temperature of the heat transfer fluid leaving the water heater when the
water heater is not firing.
•
Turn the temperature control set point down to the temperature noted.
•
If the burner does not turn on, continue reducing the temperature control set point until the burner turns on or a “click” is heard at the
temperature control housing. Note the setting of the temperature control.
•
Read the temperature of the fluid once the burner turns off. If the difference between the set point and the actual temperature is more
than 10°F, replace the temperature control.
•
If a click is heard but the burner does not turn on, check the wiring from the temperature control to the control box, then have the main
gas valve tested.
Water Flow Switch
•
Test by turning off the pump while the burner is on. The burner should immediately turn off.
Flame Roll-out Switch
•
Test by exposing it to heat by holding a match or lighter below the capillary tube while the system is running. This should cause the
system to shut down.
1-1
1 - back washing Y-strainer
2-1
2 - Y-strainer screen
1-2
