Supplementary User Guide

7.0 Cascade

CH/DHW Boilers

7.5.7 CH/DHW Boilers Default: 0

The CH/DHW Boilers setting specifies how many boilers in a Split

Cascade System will respond to a domestic hot water call. The CH/DHW

Boilers always begins with the Master boiler. The remaining boilers of

the Cascade System will only respond to central heating calls. This

allows the Cascade System to satisfy both central heating and domestic

hot water calls at the same time. At the completion of a domestic hot

water call, the CH/DHW Boilers will again be available to respond to

central heating calls. Press the LEFT or RIGHT buttons to adjust the

CH/DHW Boilers setting then press the OK button to store the setting.

Splitting the Cascade System into CH only and CH/DHW boilers

requires the boilers to be piped as shown in Figure 25 on page 48.

The CH/DHW boilers must be piped to both CH and DHW loads

directly for proper operation.

DHW Priority must be set to Enabled in DHW Settings of the

Cascade Master for proper operation.

All CH/DHW Boilers will respond to a domestic hot water call. It is

important that the domestic load is capable of transferring all of the

heat generated to prevent excessive boiler cycling.

7.5.8 Automatic Rotation Default: Enabled

Automatic Rotation allows the lead stage automatic rotation function to

be disabled. Press the UP or DOWN buttons to select Enabled or

Disabled then press the OK button to store the setting.

• Enabled – The lead boiler automatically rotates every time a call for

heat is received when a Switch option is chosen in CH Demand or

every 24 hours when a Constant option is chosen in CH Demand.

• Disabled – The lead boiler is always the Master boiler followed by

each Slave boiler.

NOTICE

Automatic Rotation

Enabled

Disabled