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valve seat. If the valve does not properly seat and continues to weep, contact a qualified service technician to inspect the
valve and system.
If water does not flow from the valve when you completely lift the lever, the valve or discharge line may be blocked.
Immediately shut the boiler down per instructions on page 2 and call a qualified service technician to inspect the valve and
system.
Check the Burner
Clean the exterior of the burner.
Flushing the CH Closed Loop Heat Exchanger
Flushing the heat exchanger is a complicated procedure that should only be performed by a qualified service technician. It is
recommended to flush the heat exchanger annually if water hardness exceeds 12 grains per gallon (considered extremely hard water).
If water hardness falls below 12 grains per gallon it is recommended to flush the heat exchanger every two to three years.
NOTE: Improper maintenance WILL VOID boiler warranty.
1. Disconnect electrical power to the boiler.
2. Close the shutoff valves on both CH supply and CH return lines (V1 and V2). See Figure 59.
3. Connect one hose (D1, Figure 59) to the valve (V3) and place the free end in a bucket. Connect one of the hoses (D3) to the
circulation pump outlet and the cold water inlet line to valve V4. Connect the other hose (D2) to the circulation pump inlet and place the
free end in the bucket.
4. Pour tankless cleaning solution into the bucket. Use an FDA approved cleaner for potable systems on the heat exchanger. Place the
drain hose (D1) and hose D2 to the pump inlet in the cleaning solution.
5. Open service valves (V3 and V4) on the hot water outlet and cold water inlet lines.
6. Turn on the circulation pump. Operate the pump and allow the cleaning solution to circulate through the boiler for at least 1 hour at a
rate of 4 gallons per minute.
7. Rinse the cleaning solution from the heat exchanger as follows:
a.
Remove the free end of drain hose D1 from the bucket.
b.
Close service valve V4 and open shutoff valve V2.
c.
Do not open shutoff valve V1.
d.
Allow water to flow through the boiler for 5 minutes.
e.
Close shutoff valve V2.
8. Disconnect hoses from lines. Properly dispose of used cleaning solution.
9. Remove the CH filter from the boiler and clean out any residues.
Figure 59 – A – Valve, and B – Hose Connection Details
Maintaining the Condensate System
The condensate trap assembly MUST BE PROPERLY INSTALLED according to these instructions when operating the boiler.
Operating the boiler without the condensate trap assembly will cause flue gases to leak and result in serious personal injury or death.
74
WHL-032 REV. 6.2.16
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