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4.17 Electrical Wiring Connections
This appliance must be electrically grounded. Ensure the electrical receptacle that the combination boiler will
be plugged into, is properly grounded; if wiring directly.
Do not attach the ground wire to either the gas or the water piping as plastic pipe or dielectric unions may
isolate the Combination boiler electrically.
The wiring diagrams contained in this manual are for reference purposes only.
Refer to these diagrams and diagrams from external controls used with this appliance. Read, understand,
and follow all wiring instructions.
Do not disconnect the power supply when the unit is in normal operation. Damage caused by freezing is
not covered under the warranty.
Manual(Rocker) switch maximum allowable current for each circulator is 16 amps at 125VAC.
( Housing : Nylon #66 UL 94V-2 , Rocker : Nylon #66 UL 94V-2, Terminal : Copper Alloy )
Terminal block (External power connector) :
DFT-20A-10P (20 amps at 300VAC)
WARNING
Install wiring and electrically ground boiler in accordance with authority having jurisdiction or, in the
absence of such requirements, follow the National Electrical Code, NFPA 70, and/or CSA C22.1
Electrical Code-Part 1 in Canada.
ELECTRICAL SHOCK HAZARD — For your safety, turn off electrical power supply at service
entrance panel before making any electrical connections to avoid possible electric shock hazard.
Failure to do so can cause severe personal injury or death.
Manual
Power
Switch
Thermostat
Connection
External
Input
Main Power
CH/Boiler
Pump
Outdoor
Sensor
0 - 10V
L N G
L N G
T T
O / S
0-10V
INPUT
R W
Terminal Block
