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SECTION 6 STANDALONE MODES OF OPERATION
When the combo units are satisfying the domestic load, they are in the Constant Setpoint mode of
operation. When the combo units switch over to space heating, their mode of operation changes to
follow the ACS command. For more information concerning the operation of the ACS, consult the AERCO
Control System Manual (OMM-0081, GF-131); for information on mounting and wiring the ACS Relay
Box, see section 2.14 in that manual.
6.5.1 Combination Control System Field Wiring
Wiring for this system is between the ACS, the ACS Relay Box, and the terminals in the I/O Box. Wire the
units using a shielded twisted pair of 18 to 22 AWG wire. When wiring multiple units, each unit's wiring
must conform to the above.
6.5.2 Combination Control System Setup and Startup
To setup a boiler for Combination mode:
1.
As a prerequisite, verify that the unit is not a BST Client or Manager. Go to:
Advanced Setup → BST Cascade → Cascade
2.
On the Controller, go to:
3.
Press
SH Operating Mode
Press the Remote Signal parameter and choose Network. While it is possible to change other
temperature-related functions for Combination mode, these functions are preset at the factory. These
default settings work well in most applications. It is suggested that AERCO be contacted prior to
changing settings other than the unit's setpoint.
•
Main Menu → Advanced Setup → Unit →Application
and choose
Combination.
•
Configuration,
Unit Mode = Off.
•
Main Menu →
Configuration.
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