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A
Power connection to the boiler.
Hot
Connection to
the terminal.
B
Circulation terminal
Priority 1 (Indirect Tank)
Hot Neutral Hot Neutral
Priority 1
(Indirect Tank)
Power supply for circulator
AC120Volts Max. 2.2Amp.
Connection to
the terminal.
120VAC output
C
Signal line connection
Aquastat
(Indirect Tank)
Connection to
the terminal.
Connect the signal line from
the indirect tank (Aquastat)
Pump Cautions
W
- Use the circulating pumps listed below or their equivalents. Add a pump if these are too small. The pump terminal
in the unit is rated for 2.2 Amps.
(See p. 25 for instructions for pumps that require greater than 2.2 Amps).
Taco Model 0013:F3 (1/6 HP) Grundfos Model 26-99F (1/6 HP) Size the circulating pump based on the pressure
loss of the boiler and the piping.
- Install the circulating pump near the return to the boiler.
24
Neutral
GND
Power Input
AC120Volts
Ground
120VAC
Input
Burner
Priority 2
(Heating)
For External Lamp
No Power supply (Only Contact)
Thermostat
Priority 1
Priority 2
(Heating)
T - T Connection
(DC15V 0.1Amp.)
Connect the signal line from
the room thermostat
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Priority 2 (Heating)
Hot Neutral Hot Neutral
Power
Priority 1
(Indirect Tank)
Power supply for circulator
AC120Volts Max. 2.2Amp.
Connection to
the terminal.
D
External Lamp
Hot Neutral Hot Neutral
Priority 1
Priority 2
(Indirect Tank)
(Heating)
Power supply for circulator
AC120Volts Max. 2.2Amp.
Connection to
the terminal.
When burning,
the lamp turns
to "ON".
CAUTION
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Burner
Power
Priority 2
(Heating)
For External Lamp
No Power supply (Only Contact)
120VAC output
Burner
Power
For External Lamp
No Power supply (Only Contact)
When the power on/off button
is "ON", lamp turns to "ON".
Input up to
Input up to
120VAC 1Amp.
120VAC 1Amp.
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