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MULTI-UNIT SYSTEM
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.
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:
• The dark squares should not need adjustment.
• This is the connection diagram between 540 (T-H3) and multi-unit controller for
2 to 20 water heaters. Above is a sample for 3 water heaters.
• The multi-unit controller automatically allocates the unit # (1-20) to each water
heater that is part of the Multi-Unit System.
• InaMulti-UnitSystem,connectthe“[1]”connectorandthe“[2]”connectorwith
the communication cable (refer to p. 33) or 18 gauge wire cables. The total cable
length can be up to 250 ft. (76.2 m) long.
OFF
ON
1
1
1
2
2
2
PARENT
PARENT
PARENT
1
2
3
4
5
6
Connectors Connectors Connectors
OFF
ON
OFF
ON
Lower bank of
DIPswitches
Lower bank of
DIPswitches
Lower bank of
DIPswitches
1
2
3
4
5
6
1
2
3
4
5
6
Communicaon cable
Remote controller cable
Unit 1
Unit 2 Unit 3
Remotecontroller
Terminals for
water heaters
9008300005
(TM-MC02)
Remotecontroller
terminals
Cold IN
Hot Out
540
(T-H3)
9008300005
(TM-MC02)
Installaon
Installaon Manual
• For detailed instructions on the multi-unit controller, refer to the
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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