Burnham ALPINE Installation, Operation And Service Instructions page 55

Viii. Electrical (continued)
Low Voltage (24 VAC) Connections - see Figure 35.
3. The terminal block TB-2 in conjunction with
terminal screw identification label is attached to
the junction box front and located inside Sage2.1
Control compartment on the left side.
4. The connections are (listed identification label top to
bottom):
a. 1 – "Heating Thermostat"
b. 2 – "Heating Thermostat"
c. 3 – "DHW Temperature Switch"
d. 4 – "DHW Temperature Switch"
e. 5 – "Outdoor Sensor"
f. 6 – "Outdoor Sensor"
g. 7 – "Header Sensor"
h. 8 – "Header Sensor"
i. 9 – "Remote Firing Rate"
j. 10 – "Remote Firing Rate"
k. 11 – "External Limit"
l. 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, AWM
Style 2092, 300Volt 60°C shielded cable. Connect
one end of the shielding on this cable to ground.
WaRning
When making low voltage connections, make
sure that no external power source is present
in the thermostat or limit circuits.
power source is present, it could destroy the
boiler's Microprocessor Control (Sage2.1). 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 boilers current draw is provided in Table
18. 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.
Table 18: Boiler Current Draw
Model Number
ALP080
ALP105
ALP150
ALP210
ALP285
ALP399
ALP500
if such a
Nominal Current
(amps)
<2
<2
<2
<3
<5
<5
<4
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