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8
Electrical
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.
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.
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
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
8-1. 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.
58
APEX
!
DANGER
!
WARNING
must be run
D. Boiler Wiring
Installation, Operating, & Service Instructions
Table 8-1: Boiler Current Draw
Nominal Current
Model Number
APX425C
APX525C
APX625C
APX725C
APX825C
Refer to Figures 8-5 and 8-6.
1. Connect to field wiring inside the junction box,
located on the upper left side of the boiler as
shown in Figure 8-2. 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. 120 VAC connections (line voltage) are located
on left PCB and are shown in Figure 8-3. Do
not exceed 5.6A total pump current draw
(system + DHW + boiler pumps). One 6.3A
slow-blow pump fuse and spare are provided.
(amps)
< 7
< 6
< 8
< 8
< 8
106308-05 - 3/23
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