Hydraulic Unit (Dhw); Cleaning The Cold Water Filter; Final Commissioning; Final Assembly - Dunkirk DCBF-100 Manual

11.6 Hydraulic Unit (DHW)

For special areas, where water is harder than 200 ppm
or 12 grains/ gallon, install polyphosphate dispenser or
equivalent treatment system, compliant with current
regulations.

11.7 Cleaning The Cold Water Filter

Boiler is fitted with cold water filter located on DHW
hydraulic assembly (B). To clean:
• Drain domestic hot water system. (C - 115 & 150)
• 165 Drain is field supplied/installed.
• Remove nut on DHW priority sensor unit using 18
mm wrench. (B)
• Pull out flow sensor and its filter.
• Remove any impurities.
NOTICE
When replacing and/or cleaning "O-rings" on
hydraulic assembly (DHW), use only Molykote
111 as a lubricant, not oil or grease.

11.8 Final Commissioning

• Allow heating system to heat. Balance the system
to achieve temperature difference across heating
supply and return pipes at the boiler.
• Check system for proper volume and pressure. See
page 4 for acceptable volume and pressure.
• Turn off boiler.
• Thoroughly flush water pipe work. Clean filters in
heating return and supply water isolating valves.
• Repressurize the system.

11.9 Final Assembly

• Place front jacket in position over boiler. Secure in
position at top using screws previously removed.
• If boiler is to be left in service with the User, set
controls and room thermostat.
• If boiler is not to be handed over immediately,
close boiler gas service valve and turn off electrical
supply.
• If there is possibility of boiler being left during frost
conditions drain boiler and system. See section
11.3 Component Replacement and Cleaning.
Manufacturer recommends attaching a label to the
boiler drawing attention to the fact that the system
has been drained.
11 - GENERAL MAINTENANCE AND CLEANING
Model DCCF-115 & 150
H H F F E E
Hydraulic Assembly (Combi-150)
A DHW Exchanger Screw
B DHW Priority Sensor
C Boiler/System Drain Tap
D Controlled Fast Fill
E DHW Temperature NTC Probe
F Low Water Pressure Cutoff
G DHW Cold Inlet
H DHW Outlet
Model DCCF-205
E
F
Hydraulic Assembly (B)
A DHW Exchanger Fixing Screw
B DHW Priority Sensor With Filter
Boiler/System Drain Tap (150 Unit Only)
C (C-1 & C-2: Access To Tap C - Bottom Of
Boiler)
D Boiler / System Filling Tap (150 Unit Only)
E DHW Temperature NTC Probe
F Low Water Cutoff
60
A A
B B
D D C C
LEGEND
A
B
LEGEND
240013375 REV A, [07/01/2021]
G G