49
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.
LEGEND
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
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 - 150 only)
•
Remove the flow sensor on top of assembly.
• Remove nut on DHW priority sensor unit using 18 mm
wrench. (B)
•
Pull out flow sensor and its filter.
• Soak in white vinegar and water mixture for 20 minutes.
11.8 Final Commissioning
• Perform Automatic Calibration function as detailed in
section 9.8.
• 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.
• 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: Component Replacement Or Periodic Cleaning.
Manufacturer recommends attaching a label to the boiler
drawing attention to the fact that the system has been
drained.
Model DCCF-150
Hydraulic Assembly (Combi-150)
NOTICE
When replacing and/or cleaning “O-rings” on hydraulic
assembly (DHW), use only Molykote 111 as a lubricant,
not oil or grease.
11 - GENERAL MAINTENANCE AND CLEANING
H
G
240012564 REV A, [05/15/2019]
A
B
F
E
D
C