U.S. Boiler Company Alpine ALP500C, Installation, Operating And Service Instructions

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Viii. Electrical
DangEr
Electrical Shock Hazard. Positively assure all electrical connections are unpowered before attempting
installation or service of electrical components or connections of the boiler or building. Lock out all
electrical boxes with padlock once power is turned off.
Warning
Electrical Shock Hazard. Failure to properly wire electrical connections to the boiler may result in
serious physical harm.
Electrical power may be from more than one source. Make sure all power is off before attempting any
electrical work.
Each boiler must be protected with a properly sized over-current device.
never jump out or make inoperative any safety or operating controls.
The wiring diagrams contained in this manual are for reference purposes only. Each boiler is shipped
with a wiring diagram attached to the front door. refer to this diagram and the wiring diagram of any
controls used with the boiler. read, understand and follow all wiring instructions supplied with the
controls.
nOTiCE
all wire, wire nuts, controls etc. are installer supplied unless otherwise noted.
A. General.
Install wiring and electrically ground boiler
in accordance with authority having jurisdiction or, in
the absence of such requirements, follow the National
Electrical Code , NFPA 70, and/or Canadian Electrical
Code Part 1, CSA C22.1 Electrical Code. Provide over
current protection not greater than 15A.
B. A separate electrical circuit
must be run
from the main electrical service with an over-current
device/disconnect in the circuit. A service switch is
recommended and may be required by some local
jurisdictions. Install the service switch in the line
voltage “Hot” leg of the power supply. Locate the
service switch such that the boiler can be shut-off
without exposing personnel to danger in the event of an
emergency.
C. Power Requirements
Nominal boiler current draw is provided in Table
34. 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)
ALP399C < 7
ALP500C < 6
ALP600C < 8
ALP700C < 8
ALP800C < 8
Table 34: Boiler Current Draw
D. Boiler wiring.
Refer to Figures 40 and 41.
1. Connect to field wiring
inside the junction box,
located on the upper left side of the boiler as shown
in Figure 37. Inside the junction box are two printed
circuit boards (PCB’s), 120 VAC Connections on the
left and Low Voltage Connections on the right.
2. 120VAC connections
(line voltage) are located
on left PCB and are shown in Figure 38. Do not
exceed 5.6A total pump current draw (
DHW + boiler pumps). One 6.3A slow-blow pump
fuse and spare are provided.