P-K DURATION II
™ Indirect Domestic Water Heating System
19
5 MAINTENANCE
5.1
M
AINTENANCE AND
I
NSPECTION
S
CHEDULE
Proper lockout/ tag out procedure must be employed when servicing this unit.
Label all wires prior to disconnection when servicing controls. Wiring errors can
cause improper and dangerous operation.
Determine the cause of any lockout or errors before resetting the boiler. If able to
determine cause of lockout, then appropriate corrective action should be taken. If unable to determine cause of
the problem, call a qualified service technician.
Verify proper operation after operation servicing.
5.1.1
Daily
Observe operating temperature and general conditions.
Listen to the performance of the P-K Duration II system.
o
If you hear a “sloshing” noise that means air is present in the system. Ensure the vent cap on the
automatic air vent are open.
o
If the pumps are making noise, ensure they are not deadheaded or cavitating. Refer to Section
5.2 for troubleshooting information.
5.1.2
Weekly
Check for leaks in the boiler piping and the domestic piping. Correct immediately if discovered.
5.1.3
Monthly
Check all relief valves by slightly opening the stem. Once you see a small amount of water exit the
discharge, close the relief valve’s stem. Once the stem is closed, ensure there is no additional water that
exits the relief valve.
Verify the domestic temperature sensor reading is accurate on the Temperature Controller.
Ensure the high temperature limit aquastat is functioning properly.
5.1.4
Annually
The brazed plate heat exchanger can scale up with calcium and other minerals present in the domestic
water. This will inhibit heat transfer and it may be necessary to clean or replace the brazed plate heat
exchanger.
Remove and inspect the circulating pumps for signs of deterioration. Repair or replace if needed.
Clean and inspect the P-K Duration II system for any signs of cracks, leaks, or loose connections. Repair
or replace if needed.
5.2
T
ROUBLESHOOTING
5.2.1
Circulation Pump Deadhead
Deadheading occurs when the circulation pump is unable to deliver any flow. Ensure that any isolation valves
installed in the system are OPEN.
