lp-673 Rev. 000 Rel. 001 Date 8.30.18
50
Figure 49 - Flushing the Water Heater
•
Lift the relief valve lever. 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 water heater down per instructions on
page 2 and call a qualified service technician to inspect the
valve and system.
•
If relief valve seats properly, restore power to the water
heater. Observe operation for five minutes and ensure it
operates properly.
Check the Burner
Clean the exterior of the burner.
Flushing the Water Heater
Flushing the heat exchanger is a complicated procedure that should
only be performed by a qualified service technician.
NOTE:
Improper maintenance WILL VOID water heater warranty.
1. Disconnect electrical power to the water heater.
2. Close the shutoff valves on both hot water outlet and cold
water inlet lines (V1 and V2). See Figure 56.
3. Connect one hose (D1, Figure 56) 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.
Maintenance Report
In unusually dirty or dusty conditions, care must be taken to keep
water heater cabinet door in place at all times. Failure to do so VOIDS
WARRANTY!
Allowing the water heater to operate with a dirty combustion
chamber will hurt operation. Failure to clean the heat exchanger
as needed by the installation location could result in water heater
failure, property damage, personal injury, or death. Such product
failures ARE NOT covered under warranty.
The combustion chamber insulation in this product contains ceramic
fiber material. Ceramic fibers can be converted to cristobalite in
very high temperature applications. The International Agency for
Research on Cancer (IARC) has concluded, “Crystalline silica inhaled
in the form of quartz or cristobalite from occupational sources is
carcinogenic to humans (Group 1).”
• Avoid breathing dust and contact with skin and eyes.
• Use a NIOSH certified dust respirator (N95). This type of
respirator is based on the OSHA requirements for cristobalite at
the time this document was written. Other types of respirators
may be needed depending on job site conditions. Current
NIOSH recommendations can be found on the NIOSH website:
http://www.cdc.gov/niosh/homepage.html. NIOSH approved
respirators, manufacturers, and phone numbers are also listed
on this website.
• Wear long-sleeved, loose fitting clothing, gloves, and eye
protection.
• Apply enough water to the combustion chamber lining to
prevent dust.
• Wash potentially contaminated clothes separately from other
clothing. Rinse clothes washer thoroughly.
NIOSH stated First Aid.
• Eye: Irrigate immediately.
• Breathing: Fresh air.
The water heater requires minimal periodic maintenance under
normal conditions. However, in unusually dirty or dusty conditions,
periodic vacuuming of the cover to maintain visibility of the display
and indicators is recommended.
Periodic maintenance should be performed once a year by a qualified
service technician to assure that all the equipment is operating safely
and efficiently. The owner should make necessary arrangements with
a qualified heating contractor for periodic maintenance of the water
heater. Installer must also inform the owner that the lack of proper
care and maintenance of the water heater may result in a hazardous
condition.
4. Pour tankless water heater cleaning solution into the bucket.
Ensure the cleaning solution is approved for potable water
systems. 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 pump. Operate the pump and allow the cleaning
solution to circulate through the water heater for at least 1 hour
at a rate of 4 gallons per minute. This will remove any possible
harmful scale deposits.
7. Rinse the cleaning solution from the water heater 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 water heater for 5
minutes.
e. Close shutoff valve V2.
8. Disconnect all hoses.
9. Remove the cold water inlet filter from the water heater and
clean out any residues.
10. Reinsert the filter and ensure the filter cap is securely
tightened.
11. Connect electrical power to the water heater.
12. Open a hot water faucet. Run the water heater continuously
for five minutes to ensure all cleaning solution is purged from the
system. Check for leaks and ensure the water heater is operating
properly.
13. Properly dispose of used cleaning solution.