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To avoid water damage or scalding due to relief valve operation, a discharge line must be connected to the valve outlet and directed to
a safe place of disposal. This discharge line must be installed by a qualified service technician or heating/plumbing installer in
accordance with the appliance installation manual. The discharge line must be terminated so as to eliminate possibility of severe burns
or property damage should the valve discharge.
Read the temperature and pressure gauge to ensure the system is
pressurized. Minimum is 10 psi. Maximum is 25 psi. Lift the relief
valve top lever slightly, allowing water to relieve through the valve
and discharge piping.
If water flows freely, release the lever and allow the valve to seat.
Watch the end of the relief valve discharge pipe to ensure that the
valve does not weep after the line has had time to drain. If the
valve weeps, lift the lever again to attempt to clean the 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 appliance 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 DHW Heat Exchanger
Flushing the DHW heat exchanger is a complicated procedure that should only be
performed by a qualified service technician. It is recommended to flush the DHW 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 appliance warranty.
1. Disconnect electrical power to the appliance.
2. Close the shutoff valves on both hot water outlet and cold water inlet lines (V1 and V2).
See Figure 53.
3. Connect one hose (D1, Figure 54) 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 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 appliance for at least 1 hour
at a rate of 4 gallons per minute.
7. Rinse the cleaning solution from the DHW 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 appliance for 5 minutes.
e.
Close shutoff valve V2.
8. Disconnect hoses from DHW lines. Properly dispose of used cleaning solution.
9. Remove the cold water inlet filter from the appliance and clean out any residues.
10. Reinsert the filter and ensure the filter cap is securely tightened.
Figure 53 – Valve Detail
Figure 54 – Hose Connection Detail
71
WHL-015 REV. 1.13.17
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