Alpine Installation, Operating, and Service Instructions

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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 identification label is attached
to the junction box front and located inside
Sage2.X Control compartment on the left side.
4. The connections are (listed identification
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. 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 fluorescent 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,
VIII. Electrical (continued)
AWM Style 2092, 300 Volt 60°C shielded cable.
Connect one end of the shielding on this cable
to ground.
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.X Control internal
sequencer, the Sage2.X 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.
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.X). One example of an external
power source that could be inadvertently
connected to the low voltage connections is a
transformer in old thermostat wiring.