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8
Electrical
(continued)
F. Multiple Boiler Wiring
1. 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.
2. Required Equipment and Setup
a. Header Sensor (P/N 101935-01 or 103104-
01).A header sensor must be installed and
wired to the Sequencer Master boiler. The
header sensor is installed on the common
system piping and provides blended
temperature information to the Sequence
Master. Refer to Figure 6-16 for installation
location and Figure 6-14 or 6-15 for
installation detail.
9
System Start-up
!
WARNING
Explosion Hazard. Asphyxiation Hazard.
Electrical Shock Hazard.
Start-up of this boiler should be undertaken only
by trained and skilled personnel from a qualified
service agency. Follow these instructions
exactly. Improper installation adjustment, service
or maintenance can cause property damage,
personal injury or death.
A. Verify that the Venting, Water Piping,
Gas Piping and Electrical System are
Installed Properly.
instructions contained in this manual.
B. Confirm all Electrical, Water and Gas
Supplies are Turned Off at the Source
and that vent is clear of obstructions.
C. Confirm that all Manual Shut-off Gas
Valves
between the boiler and gas source are
closed.
68
Refer to installation
APEX
Installation, Operating, & Service Instructions
b. Ethernet Cables
Ethernet cables are used to connect the
boiler network together. These are standard
"straight through" cables that can be
purchased at electrical distributors.
Alternately, the network can be wired
together by simply wiring Modbus Boiler-to-
Boiler terminals A, B, and C between each
boiler. Refer to Figures 8-5, 8-6 and 8-9 for
wiring location.
G. External Multiple Boiler Control System
As an alternate to the control internal sequencer,
the 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 8-10 and 8-11)
are provided as examples of typical multiple boiler
control systems.
D. Heating System Cleaning and
Treatment
!
CAUTION
Component Damage.
Proper flushing, cleaning, and water side
maintenance is highly recommended to protect
boiler heat exchanger. Scaling and sediment
build up may not be covered under warranty.
1. Flush entire heating system to remove sediment,
flux, and traces of boiler additives
2. It is recommended to clean the heating system
with an approved cleaner such as the following
or an equivalent:
· Fernox F3 Cleaner
· Sentinel X400 System Restorer
Follow the manufactures instructions for proper
dosage and use.
Note: Cleaning the system prior to removing the
old boiler or by isolating the new boiler from the
system while cleaning it will be more beneficial
106308-05 - 3/23
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