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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 locat-
ed 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 INSTINCT ring rate can be controlled by an exter-
nal 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 INSTINCT will automatically mod-
ulate 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 tem-
perature 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 communi-
cate with building management systems (BMS) through
a Modbus interface. Consult the INSTINCT CTRLMax
Control Supplement for more information.
Modbus communication will only occur if the external
device is properly wired to the INSTINCT as follows:
X7-1 = RS-485 –
X7-2 = RS-485 Ground
X7-3 = RS-485 +
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