Multi-Unit System - A.O. Smith T-H3S-DV Installation Manual And Owner's Manual

Multiple 540 (T-H3) models can be combined for a Multi-Unit System, along with the multi-unit
controller (Part 9008300005 (TM-MC02)). The multi-unit controller can control from 2 units to 20
units for commercial or residential applications. For a 20-unit system, the computer can modulate
between the usages of 13,000 BTU/h (Propane) or 15,000 BTU/h (Natural gas) to 4.0 Million BTU/h.
9008300005
(TM-MC02)
Cold IN
An individual cut-off switch is recommended for each unit in a Multi-Unit System for the purpose
of maintenance.
Multi-Unit System connection diagram
Multi-unit controller with the remote controller wiring:
Remote controller
9008300005
Remote controller
Remote controller cable
terminals
Terminals for
water heaters
Communication cable
he dark squares should not need
• T
his is the connection diagram between 540 (T-H3) and multi-unit controller for
• T
2 to 20 water heaters. Above is a sample for 3 water heaters.
he multi-unit controller automatically allocates the unit # (1-20) to each water
• T
heater that is part of the Multi-Unit System.
• In a Multi-Unit System, connect the "[1]" connector and the "[2]" connector with
the communication cable (refer to p. 33 and 34) or 18 gauge wire cables. The
total cable length can be up to 250 ft. (76.2 m) long.
• For
instructions that are packaged with the multi-unit controller.
• When the 710 (T-M32) and 540 (T-H3) are connected together to the
multi-unit controller as a Multi-Unit System,refer to the installation
manual of the multi-unit controller for more details.
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MULTI-UNIT SYSTEM

Unit 1
Connectors
(TM-MC02)
Lower bank of
DIPswitches
adjustment.
detailed instructions on the multi-unit controller, refer to the
37
Unit 2
Connectors
Lower bank of
DIPswitches
Page
Installation Manual
Installation
540
(T-H3)
Hot Out
Unit 3
Connectors
Lower bank of
DIPswitches