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CHAPTER 8
CHAPTER 8 - WIRING
1. Remove the factory-installed brown jumper wire at
the Manual Reset Limit terminals that will accept
the additional boiler limit.
2. Remove the factory-installed orange jumper wire at
the Auto Reset Limit terminals that will accept the
additional boiler limit.
3. Connect the external limit wires to the Manual Reset
Limit or Auto Reset Limit low voltage terminals
located on the lower right corner of the CTRLMax
control module housing as shown in Fig. 33 on page
49.
8.3.7 External Modulation Control
The EXALT ring rate can be controlled by an external
modulating boiler controller. See Chapter 13 on page
77 for external modulation signal wiring and setup.
8.3.8 System Sensor Wiring
An optional system temperature sensor can be placed
on the central heating loop to control the temperature
in the central heating loop instead of the boiler
loop. When connected, the EXALT will automatically
modulate to maintain the target temperature in the
central heating loop. The boiler supply temperature
sensor will continue to be used as a high temperature
limit.
Locate the system temperature sensor where it
can accurately measure the supply temperature to
the heating system. Inaccurate system tempera-
ture readings could lead to overheating or under
heating resulting in property damage.
1. Connect the system temperature sensor wires to
low voltage terminals X5-3&4 located at the bottom
of the CTRLMax control module as shown in Fig. 33
on page 49.
CAUTION
8.3.9 Cascade Wiring - Optional
The CTRLMax control includes the ability to operate up
to six Solo boilers together as one without the need for
external controllers. Consult the Fig. 10 on page 20
for more information.
8.3.10 Modbus
The CTRLMax control includes the ability to
communicate with building management systems
(BMS) through a Modbus interface. Consult the EXALT
CTRLMax Control Supplement for more information.
Modbus communication will only occur if the external
device is properly wired to the EXALT as follows:
X7-1 = RS-485 –
X7-2 = RS-485 Ground
X7-3 = RS-485 +
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