Installation / Operation Instruction Manual

BLP SERIES Install, Operation, and Maintenance Manual
SECTION 5: TROUBLESHOOTING
Rev-1 Bradford White • 200 Lafayette St. • Middleville, MI 49333 Page 70 of 83
BrutePlate Manual Phone: [phone] • Website: www.BradfordWhite.com 02/26/2020
SECTION 5: TROUBLESHOOTING
The following table summarizes problems that may be encountered over the life of a BLP Series unit, and the procedures to remedy those
problems. The left-hand column lists the symptoms. The remaining columns are suggested procedures or “remedies” that should be followed to
identify and correct the problem.
SYMPTOM
PROBABLE CAUSE(S)
REMEDY
Water heater is
not able to
maintain the
required
temperature at
the rated
capacity.
1. The water heater temperature controls
not set properly.
2. Control valve is not opening and closing
properly.
3. Boiler water supply temperature is low.
4. Boiler water flow rate is low.
5. Boiler water inlet strainer is clogged.
6. The heat exchanger is scaled on boiler
water side.
7. Water heater and control valve being
used at higher than rated design capacity.
8. Recirculating pump malfunctions/failed.
9. Improper signal to control valve from
control panel.
1. Check the set point settings on the controller. Readjust the set
point settings if below the required temperature. Refer to
programming sequence in section 3.11 for complete settings
information.
2. See the adjustment and testing instructions contained in the
supplied Installation/Operations Manual. Repair or replace the
valve if necessary. Refer to Sections 3.5 and 4.6 Control Valve
Technical Information if hard copy is not available. Make sure valve
is in Automatic mode.
3. Check to make sure the boiler water inlet temperature gauge
reading is equal to the design conditions. Readjust the boiler supply
water temperature if necessary.
4. Measure the boiler water supply flowrate using flowmeter and
check the pump to make sure the flowrate is not lower than the
design conditions.
5. Check the differential pressure/dirt gauge and blowdown the
strainer until the gauge is in GREEN region.
6. Clean the heat exchanger per instructions in Section 4.3. Call
Bradford White or your authorized representative for instructions on
repair or replacement if necessary. Also ensure the water quality
levels are within the allowable limits.
7. Check to make sure the operating conditions do not exceed the
design conditions. Reduce the load or resize the heat exchanger.
8. Recirculation piping temperature should be same as the hot water
outlet temperature when recirculation pump is operating properly.
Check the power supply or repair/replace the pump if needed.
9. Open the valve cover and check 4-20mA control signal is present
at valve terminals. Troubleshoot panel to restore proper signal to
control valve if it malfunctions.