Electrical Supply; Air Supply; Domestic Hot Water Mode; For Utica Boiler Mac-150 And Mah-125 With Indirect Tank - UTICA BOILERS MAC-150 Manuel D'installation, D'utilisation Et D'entretien

3.6

ELECTRICAL SUPPLY

The boiler requires a 120V 60Hz power supply. Ensure the electrical supply is polarized.
The boiler must be grounded.
There must only be one common isolator, providing complete electrical isolation, for the boiler and any external controls.
Using PVC insulated cable 12 AWGx3C 221°F 105 ºC.
All wiring must be installed in accordance with requirements of National Electrical Code and any additional national, state, or local
code requirements having jurisdiction. All wiring must be N.E.C. Class 1. Boiler must be electrically grounded in accordance with
the National Electrical Code, ANSI/NFPA No. 70-latest edition.
In Canada, installation must conform to CSA C22.1 Canadian Electrical Code Part 1 and any local codes.
3.6.1 Install Room Thermostat
Install room thermostat on an inside wall. Never install where it will be influenced by drafts, hot or cold water pipes, lighting fixtures,
television, sun rays or near a fireplace.
3.7

AIR SUPPLY

The boiler does not require any air vents in the room in which it is installed, or when installed in a closet.
3.8

DOMESTIC HOT WATER MODE

For Utica Boiler MAC-150 and MAH-125 with indirect tank

WARNING
Water temperature over 125° F (51°C) can cause severe burns instantly, or death from scalds. Children, disabled, and
elderly are at highest risk of being scalded. See user's instructions before setting the water temperature.
• Priority is given to the domestic hot water supply. A demand at a tap or shower will override any central heating requirement.
• The 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. (MAC-150 only)
• The combustion fan will then come on and begin to run at ignition speed.
• 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.
• The 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.
3.9

FROST PROTECTION MODE

The frost protection mode is integrated into the appliance when left in the domestic hot water or central heating position. If the
temperature falls below 41°F / 5° C the boiler will fire on its minimum setting until a flow temperature of 86°F / 30° C is reached.

3.10 PUMP PROTECTION

The pump will automatically operate for 1 minute in every 24 hours to prevent seizing.

3.11 GAS PIPING

Run the gas supply line in accordance with all applicable codes.
Locate and install the manual shutoff valve before the gas valve as shown in section 3: "GENERAL BOILER INFORMATION", in
accordance with state and local requirements.
NOTICE
A sediment trap must be provided upstream of the gas controls.
15 240011317, Rev. F [03/31/2017]