Prestige ACVMax Control Supplement

7.0 Cascade

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 gas-

ket 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 confirm that the wires are firmly attached to the sen-

sor terminals.

5. Select a location for the sensor on the common supply header

downstream of all boilers in the system. Clean the pipe with fine

sandpaper or emery cloth to ensure the pipe is clean and sensor

will make good contact with the pipe.

6. Press 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 control module

of the Master boiler.

7.3.3 Cascade Communication Cable

• A communication cable PACAB01 must be installed between each

boiler in the Cascade System. The cable has a 4 pin molex connec-

tor 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

Figures 22, 24 and 26 on pages 45, 47 and 49 for wiring details.

7.3.4 Low Voltage Wiring Connections

• Thermostat Wiring – CH1 and CH2 calls must be wired into the

Cascade Master.

• Outdoor Sensor Wiring – The outdoor temperature 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 System. When a boiler limit opens, that par-

ticular 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 Cascade Master. The modulation signal will control the

firing rate of the entire Cascade System, not just the Cascade Master.

• Modbus Wiring – A building management system (BMS) connection

must be wired into the Cascade Master to obtain cascade system and

Master boiler information.