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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 identication label is attached to the junction
box combination cover/inside high voltage bracket.
2. The conductor insulation colors are:
a. Black – L1 line voltage “Hot”
b. White – L2 line voltage “Neutral” for boiler and
circulators
c. Red – Line voltage “Hot” for “Heating”
circulator, “System” circulator and “DHW”
circulator
d. Green – Ground connection
Low Voltage (24 VAC) Connections - see Figure 27.
3. The terminal block TB-2 in conjunction with
terminal screw identication label is attached to
the junction box front and located inside Sage2.2
Control compartment on the left side.
4. The connections are (listed identication
label top to bottom):
• 1 – “Heating Thermostat”
• 2 – “Heating Thermostat”
• 3 – “DHW Temperature Switch”
• 4 – “DHW Temperature Switch”
• 5 – “Outdoor Sensor”
• 6 – “Outdoor Sensor”
• 7 – “Header Sensor”
• 8 – “Header Sensor”
• 9 – “Remote Firing Rate -”
• 10 – “Remote Firing Rate +”
• 11 – “External Limit”
• 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. 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
VIII. Electrical (continued)
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.
F. External Multiple Boiler Control System
As an alternate to the Sage2.2 Control internal sequencer,
the Sage2.2 Control also accepts an input from an
external sequencer. Follow multiple boiler control system
manufacturer (Honeywell, Tekmar, etc.) instructions to
properly apply a multiple boiler control system. The
Tekmar Model 264 and Model 265 based control wiring
diagrams (Figures 31A and 31B) are provided as examples
of typical multiple boiler control systems.
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