6. Clean and flush the flow regulator with clean water or
air to remove sediment.
7. Replace the flow regulator cartridge into the housing
with the screen facing towards to open end of the
housing.
8. Fully insert the housing back into the CHB unit until
the locking tabs are below the grooves in the CHB
body.
9. Turn counter clockwise until the resistance is felt.
10. Pressurize the DHW side of the boiler and open a hot
water tap to drain air from the system. Check for leaks
around the flow regulator housing.
H. PLATE HEAT EXCHANGER MAINTENANCE
The Series PBC™ uses a high efficiency Plate Heat
Exchanger (PHE) to heat the domestic hot water side of
the unit. The high efficiency nature of the PHE leaves it
susceptible to calcium build up and passage narrowing if
the domestic water is not properly treated before passing
through the PHE. Regular cleaning of the PHE will greatly
extend the lifetime and ease of maintenance for the PHE.
The steps below can be taken to remove and clean the
PHE.
Complete Removal Cleaning
1. Power of the Boiler.
2. Isolate and drain BOTH the Central Heat loop of the
Boiler and the Domestic side of the boiler.
3. Optional: Close the gas shutoff valve to the unit and
disconnect the gas line from the gas valve. The entire
burner plate can be pulled by removing the 4 10mm
nuts on the front of the main heat exchanger. This will
give much more access to the PHE.
4. Using a 4mm or 5/32” Allen wrench, remove the two
flanged screws on the front of the CHB. Hold the
PHE in place when removing the screws. Pull the
PHE up and out of the unit being careful to not get
water onto any of the components.
5. The PHE has 4 gaskets that seal the connections.
Remove and check these gaskets for wear or
degradation. Replace if necessary.
6. The PHE can be cleaned using a solution of
“Rydlyme” (recommended for best results) (available
online www.rydlyme.com) or “CLR” (available at
most hardware stores).
7. Thoroughly flush the PHE with clean water.
8. Replace the gaskets.
9. Place the PHE back in place behind the CHB and
tighten the two screws back in place.
10. Optional: Re-install the burner plate and gas line
connections. Return gas pressure to the unit ensuring
there are no leaks.
11. Return water pressure to the unit and ensure all air is
removed from the Central Heat Side of the boiler.
12. Open the domestic outlet drain (or a nearby faucet’s
hot water valve) and flush the PHE for 1 minute to
ensure all cleaning solution is removed.
13. Close water flow and power on the boiler.
Quick Cleaning (With Webstone kit or isolation
and drain valves installed)
1. Power off the unit.
2. Close both inlet and outlet DHW isolation valves.
3. Open both DHW inlet and outlet drain valves.
4. Flush a solution of “Rydlyme” (recommended for best
results) (available online www.rydlyme.com) or “CLR”
(available at most hardware stores) through the PHE
repeatedly to loosen any debris or buildup.
5. Flush system with clean water. Do not allow cleaning
water into dwellings piping.
6. Once flushing water is running clear, close all drain
valves.
7. Open isolation valves and a hot water tap. Allow
water to flow for one minute to ensure all cleaning
solution is out of the system.
8. Close tap and power on boiler.
52
MAINTENANCE
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