AHRI APEX, Installation, Operating And Service Instructions

Page: 65 / 124

65
Figure 31: Recommended Direct Immersion
Header Sensor Installation Detail
Figure 32: Alternate “Immersion” type Header
Sensor Installation Detail
VIII. Electrical
(continued)
G. External Multiple Boiler Control System
As an alternate to the Sage2.1 Control internal sequencer,
the Sage2.1 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 30A and 30B) are provided as examples
of typical multiple boiler control systems.
H. Multiple Boiler Operating Information
1. Required Equipment and Setup
a. Header Sensor (P/N 101935-01 or 103104-01)
A header sensor must be installed and wired
to the Master Sequencer “enabled” Sage2.1
Controller. The header sensor is installed on the
common system piping and provides blended
temperature information to the Sequence Master.
Refer to piping diagram Figure 23A on page 49
for installation location and Figure 31 or 32 for
installation detail.
b. RJ45 Splitters (P/N 103192-01)
RJ45 Splitters are required for installing
communications between three or more boilers.
When two boilers are connected the splitter is
not required.
c. 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 terminal J3, Modbus 2,
terminals A, B and V- between each boiler.
Refer to Figures 26 and 27 terminal J3 for wiring
location.