32
Pressure gauge
- to indicate the system pressure to be
maintained.
6.7 Central Heating System
Boiler is designed for use in a sealed central heating system.
Design the system to operate with flow temperatures of up to
176°F (80° C), take pump head, expansion tank size, mean
radiator temperature, etc. into account.
Boiler is supplied with the following components: Pressure
relief valve - 30.0 psi (2.1 bar). Boiler internal pressure switch
will shut boiler off below 7.5 psi / 0.5 bar and above 43.5 psi
/3.0 bar.
6.8 Domestic Hot Water Mode
Utica Boiler MACF-150 & 205 and MAHF-125 & 165 with
indirect tank
•
Once the fan reaches ignition speed the control board will
allow power to flow to the spark generator and gas valve
creating ignition in the combustion chamber. The flame
sensor will acknowledge the presence of the flame in the
combustion chamber and send a signal to the control
board.
•
Temperature sensors will send a signal to the control board
allowing the control board to increase/ decrease the speed
of the fan. The combustion fan will in turn modulate the
gas rate accordingly.
•
When the domestic hot water demand ceases the burner
will extinguish, unless there is a demand for central
heating.
6.9 Frost Protection Mode
Frost protection mode is integrated into the appliance when
electricity is connected to the boiler, regardless if power is "on"
or "off".
If temperature falls below 41°F / 5° C boiler will fire on its
minimum setting until flow temperature of 86°F / 30° C is
reached.
6.10 Pump Protection
Pump will automatically operate for 1 minute in every 24 hours
to prevent seizing.
FIGURE 6-6
6 - HYDRONIC PIPING
Cold Water
Supply
CH/System
Pump
•
Priority is given to the domestic hot water supply.
Demand at tap or shower will override any central heating
requirement.
•
Flow of water will operate the DHW flow switch which
requests the 3 way valve to change position. This will allow
the pump to circulate the primary water through the DHW
plate heat exchanger. (MACF-150 & 205 only)
•
Combustion fan will then come on and begin to run at
ignition speed.
WARNING
Burn, Scald Hazard! Water temperature over 125°F
(51°C) can cause severe burns and scalding. See
User's Manual before setting water temperature.
Failure to follow these instructions could result in death
or serious injury.
!
240012874 REV A, [01/31/2020]
Содержание MACF-150
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Страница 65: ...63 A 2 MODELS 150 Combi APPENDIX A WIRING DIAGRAMS 240012874 REV A 01 31 2020 ...
Страница 66: ...64 A 4 MODELS 205 Combi APPENDIX A WIRING DIAGRAMS 240012874 REV A 01 31 2020 ...
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Страница 68: ...66 NOTES 240012874 REV A 01 31 2020 ...
Страница 90: ...20 150F 205F WITH ZONE PUMPS WIRING DIAGRAM 150F 205F WITH ZONE PUMPS PN 240012875 REV A 01 31 2020 ...
Страница 92: ...22 150F 205F WITH ZONE VALVES WIRING DIAGRAM 150F 205F WITH ZONE VALVES PN 240012875 REV A 01 31 2020 ...
Страница 98: ...28 MODEL 125F Heat Only 125F FLOOR STANDING HEAT ONLY WIRING DIAGRAM PN 240012875 REV A 01 31 2020 ...
Страница 99: ...29 MODEL 150F Combi 150F FLOOR STANDING COMBI WIRING DIAGRAM PN 240012875 REV A 01 31 2020 ...
Страница 100: ...30 165F FLOOR STANDING HEAT ONLY WIRING DIAGRAM MODEL 165F Heat Only PN 240012875 REV A 01 31 2020 ...
Страница 101: ...31 205F FLOOR STANDING COMBI WIRING DIAGRAM MODEL 205F Combi PN 240012875 REV A 01 31 2020 ...
Страница 106: ...36 Low Water Cutoff Detail LOW WATER CUTOFF NO NO YES PN 240012875 REV A 01 31 2020 ...
Страница 114: ...44 NOTES PN 240012875 REV A 01 31 2020 ...