Westinghouse WBRC 140 Series Installation, Start-Up, Maintenance, Parts, Warranty page 63

• If you notice flue gas leaking from the opening, this indicates
a dry condensate drain trap. If problem persists, contact
a qualified service technician to inspect the boiler and
condensate line and refill the condensate trap.
• If applicable, check the condensate neutralizer and ensure it is
full of condensate neutralizing marble chips.
Check the Air Vent
Loosen cap one counterclockwise turn to allow air vent to operate.
See Figure 55. If the air vent works freely without leaking, close the
valve by turning clockwise. If vent does not operate correctly, contact
a qualified service technician to replace the vent.
Check Primary and Gas Piping
• Remove the boiler cover and perform a gas leak inspection
following Operating Instructions, page 2, this manual. If gas
odor or leak is detected, follow procedures on page 2. Call a
qualified service technician.
• Visually inspect for leaks around the boiler water connections
and around the heat exchanger. Visually inspect the external
system piping, circulators, and system components and
fittings. Immediately call a qualified service technician to repair
any leaks
WARNING
!
Have leaks fixed at once by a qualified service technician. Failure to
comply could result in substantial property damage, severe personal
injury, or death.
Operate Pressure Relief Valve
• Before proceeding, verify that the relief valve outlet has been
piped to a safe place of discharge, avoiding any possibility of
scalding from hot water.
• Shut power off to the boiler. To avoid scalding, wait for boiler to
cool before operating the relief valve.
WARNING
!
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 in accordance with the boiler installation
manual. The discharge line must be terminated so as to eliminate
possibility of severe burns or property damage should the valve
discharge.
• 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 boiler 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 boiler. Observe
operation for five minutes and ensure it operates properly.
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.
Figure 55 - Air Vent Detail
Figure 56 - Flushing the CH Closed Loop Heat Exchanger
1. Initiate a CH thermostat call to position the 3 way valve in CH
Mode.
2. Disconnect electrical power to the boiler when the blower icon
appears on the display panel.
3. Close the shutoff valves on both CH supply and CH return lines
(V1 and V2). See Figure 56.
4. 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.
5. 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.
6. Open service valves (V3 and V4) on the hot water outlet and cold
water inlet lines.
7. 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.
8. 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.
9. Disconnect hoses from lines. Properly dispose of used cleaning
solution.
10. Remove the CH filter from the boiler and clean out any residues.
11. Repeat process on the DHW loop of the boiler.
Flushing the DHW 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 hot water outlet and cold water
inlet lines (V1 and V2). See Figure 57-A.
3. Connect one hose (D1, Figure 57-B) to the valve (V3) and place the
free end in a bucket. Connect one of the hoses (D3) to the circulation
whl-648 Rev. 001 Rel. 003 Date 10.8.19
63