Install Instructions

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service switch such that the boiler can be shut-off
without exposing personnel to danger in the event of
an emergency. Connect the main power supply and
ground to the 3 boiler wires (black, white and green)
located in the junction box at top left side of the boiler
jacket.
C. Refer to Figures 27 and 28 for details on the
internal boiler wiring.
Line Voltage (120 VAC) Connections - see Figure 27.
1. The line voltage connections are located in the
junction box on the left side of the vestibule. The
terminal block TB-1 in conjunction with terminal
screw identication label is attached to the junction
box combination cover/inside high voltage bracket.
2. The connections are:
• TB1-1: Ground
• TB1-2: L1 Line Voltage (Hot)
• TB1-3: L2 Line Voltage (Neutral)
• TB1-4: System Circulator (Hot)
• TB1-5: System Circulator (Neutral)
• TB1-6: Boiler Circulator (Hot)
• TB1-7: Boiler Circulator (Neutral)
• TB1-8: DHW Circulator (Hot)
• TB1-9: DHW Circulator (Neutral)
Low Voltage (24 VAC) Connections - see Figure 27.
3. The terminal block TB-2 in conjunction with
terminal screw identication label is attached to
the junction box front and located inside Sage2.2
Control compartment on the left side.
4. The connections are (listed identication
label top to bottom):
• TB2-1: “Heating Thermostat”
• TB2-2: “Heating Thermostat”
• TB2-3: “DHW Temperature Switch”
• TB2-4: “DHW Temperature Switch”
• TB2-5: “Outdoor Sensor”
• TB2-6: “Outdoor Sensor”
• TB2-7: “Header Sensor”
• TB2-8: “Header Sensor”
• TB2-9: “Remote Firing Rate +”
• TB2-10: “Remote Firing Rate -”
• TB2-11: “External Limit”
• TB2-12: “External Limit”
5. If the outdoor sensor is connected to terminals
5 and 6 “Outdoor Sensor”, the boiler will adjust the
target space heating set point supply water temperature
downwards as the outdoor air temperature increases.
VIII. Electrical (continued)
If used, this sensor should be located on the outside of
the structure in an area where it will sense the average
air temperature around the house. Avoid placing this
sensor in areas where it may be covered with ice or
snow. Locations where the sensor will pick up direct
radiation from the sun should also be avoided. Avoid
placing the sensor near potential sources of electrical
noise such as transformers, power lines, and uorescent
lighting. Wire the sensor to the boiler using 22 gauge
or larger wire. As with the sensor, the sensor wiring
should be routed away from sources of electrical noise.
Where it is impossible to avoid such noise sources, wire
the sensor using a 2 conductor, UL Type CM, AWM
Style 2092, 300 Volt 60°C shielded cable. Connect one
end of the shielding on this cable to ground.
NOTICE
When making low voltage connections, make
sure that no external power source is present
in the thermostat or limit circuits. If such a
power source is present, it could destroy the
boiler’s microprocessor control (Sage2.2). One
example of an external power source that could
be inadvertently connected to the low voltage
connections is a transformer in old thermostat
wiring.
D. Power Requirements
Nominal boiler current draw is provided in Table 21.
These values are for planning purposes only and represent
only the boiler’s power consumption. To obtain total
system power consumption add any selected circulator
and component current draws.
Model Number
Nominal Current
(amps)
ALP080B <2
ALP105B <2
ALP150B <2
ALP210B <3
ALP285B <5
Table 21: Boiler Current Draw
E. Multiple Boiler Wiring
Install over-current protection in accordance with authority
having jurisdiction or, in the absence of such requirements,
follow the National Electric Code, NFPA 70, and/or
Canadian Electrical Code Part 1, CSA C22.1. Do not
provide over-current protection greater than 15 amperes. If
it becomes necessary to provide greater amperes (because
of the number of boilers provided) use separate circuits
and over-current protection for additional boilers.