54
11 - GENERAL MAINTENANCE AND CLEANING
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 xing screw
B DHW priority sensor with lter
C
Boiler/system drain tap (150 unit only)
(C-1 & C-2: access to tap C - bottom of boiler)
D Boiler / system lling tap (150 unit only)
E DHW temperature NTC probe
F Low water cutoff
11.7 Cleaning The Cold Water Filter
Boiler is tted with cold water lter located on DHW hydraulic
assembly (B). To clean:
• Drain domestic hot water system. (C - 150 only)
• 165 Drain is eld supplied/installed.
• Remove nut on DHW priority sensor unit using 18mm
wrench. (B)
• Pull out ow sensor and its lter.
• Remove any impurities.
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 ush water pipe work. Clean lters in heating
return and supply water isolating valves.
• Repressurize the system.
11.9 Final Assembly
• Place front jacket in position over boiler. Ensure bottom is
located behind the control panel. 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 DCC-150
Model DCC-205
B
A
Hydraulic Assembly (B)
F
E
NOTICE
When replacing and/or cleaning “O-rings” on hydraulic
assembly (DHW), use only Molykote 111 as a lubricant,
not oil or grease.
240011947 REV B, [03/31/2018]
To Next Page
Loading...
