CTRLMax Manual
57
CHAPTER 8
Fig. 24 - System Sensor Direct Immersion
Fig. 25 - System Sensor Dry well Installation
CHAPTER 8 - CASCADE
Install the temperature sensor as follows:
1. Remove the white plastic cover from the sensor
2. Cut a small slit in the gasket seal on the end of the
sensor.
3. Route 18 AWG 2-wire cable or similar cable through
the seal gasket into the enclosure.
4. Push down on the orange wire terminal retainers to
insert the wires into the sensor terminals. Release
the orange wire terminal retainers and conrm that
the wires are rmly attached to the sensor termi-
nals.
5. Select a location for the sensor on the common
supply header downstream of all boilers in the sys-
tem. Clean the pipe with ne sandpaper or emery
cloth to ensure the pipe is clean and sensor will
make good contact with the pipe.
6. Actuate the white cover onto the sensor and strap
the sensor to the pipe using the included wire tie.
7. Wire the sensor to terminals 3 & 4 of X5 on the con-
trol module of the Master boiler.
8.4.3 Cascade Communication Cable
A communication cable PACAB01 must be installed be-
tween each boiler in the Cascade System. The cable has
a 4 pin molex connector on one end and a 6 pin molex
connector on the other end. The 4 pin molex connector
plugs into the Cascade Master X16 connector on the
control module of the Master boiler or prior Slave boiler
in cascades of three or more boilers. The 6 pin molex
connector plugs into the Cascade Slave connector of
the Slave boiler. Reference Fig. 28 on page 68, Fig.
30 on page 70 and Fig. 32 on page 72 for wiring
details.
8.4.4 Low Voltage Wiring Connections
• Thermostat Wiring – CH1 and CH2 calls must
be wired into the Cascade Master.
• Outdoor Sensor Wiring – The outdoor tem-
perature sensor must be wired into the Cascade
Master.
• Domestic Hot Water Wiring – A DHW call
must be wired into the Cascade Master.
• Additional Boiler Limits – Boiler Limits must
be wired into each boiler in the Cascade Sys-
tem. When a boiler limit opens, that particular
boiler will lockout and will be removed from
Cascade System operation. The other boilers in
the Cascade System will continue to operate if
they are not in a lockout.
• External Modulation Control – An External
Modulation Signal must be wired into the Cas-
cade Master. The modulation signal will control
the ring rate of the entire Cascade System, not
just the Cascade Master.
• Modbus Wiring – A building management sys-
tem (BMS) connection must be wired into the
Cascade Master to obtain cascade system and
Master boiler information.
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