63
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 strainer 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.
• Soak in white vinegar or replace as necessary.
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 using screws previously removed.
• If boiler is to be left in service, 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
11.4 Draining the boiler.Manufacturer recommends
attaching a label to the boiler drawing attention to
the fact that the system has been drained.
Model MACF- 150 Shown
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
LEGEND
A
DHW Exchanger Fixing Screw
B
DHW Priority Sensor With Filter
C
Boiler/System Drain Tap (150 Unit Only)
(
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
Model MACF-205
B
A
Hydraulic Assembly (B)
F
E
240013503 REV A, [03/15/2022]
Summary of Contents for UTICA BOILERS MACF-115
Page 2: ...MACF 150...
Page 4: ...MAHF 125...
Page 77: ...73 A 1 MODEL 75 100 Heat Only APPENDIX A WIRING DIAGRAMS 240013503 REV A 03 15 2022...
Page 78: ...74 A 2 MODEL 125 Heat Only APPENDIX A WIRING DIAGRAMS 240013503 REV A 03 15 2022...
Page 79: ...75 APPENDIX A WIRING DIAGRAMS A 3 MODEL 165 Heat Only 240013503 REV A 03 15 2022...
Page 80: ...76 APPENDIX A WIRING DIAGRAMS A 4 MODEL 115 Combi 240013503 REV A 03 15 2022...
Page 81: ...77 A 5 MODEL 150 Combi APPENDIX A WIRING DIAGRAMS 240013503 REV A 03 15 2022...
Page 82: ...78 A 6 MODEL 205 Combi APPENDIX A WIRING DIAGRAMS 240013503 REV A 03 15 2022...
Page 117: ...33 PN 240012875 REV D 03 15 2022 MODEL 75 100 HEAT ONLY 75 100 HEAT ONLY WIRING DIAGRAM...
Page 118: ...34 PN 240012875 REV D 03 15 2022 MODEL 125 HEAT ONLY 125 HEAT ONLY WIRING DIAGRAM...
Page 119: ...35 PN 240012875 REV D 03 15 2022 MODEL 165 HEAT ONLY 165 HEAT ONLY WIRING DIAGRAM...
Page 120: ...36 PN 240012875 REV D 03 15 2022 115 COMBI WIRING DIAGRAM MODEL 115 COMBI...
Page 121: ...37 PN 240012875 REV D 03 15 2022 MODEL 150 COMBI 150 COMBI WIRING DIAGRAM...
Page 122: ...38 PN 240012875 REV D 03 15 2022 MODEL 205 COMBI 205 COMBI WIRING DIAGRAM...
Page 128: ...44 PN 240012875 REV D 03 15 2022 LOW WATER CUTOFF LOW WATER CUTOFF DETAIL NO NO YES...
Page 133: ...49 PN 240012875 REV D 03 15 2022 3 FAULT SOLUTION SECTIONS...