T-H3 Installation Manual

39 Page
MULTI-UNIT SYSTEM
Multiple 540 models can be combined for a Multi-Unit System, along with the multi-unit controller (Part
100112691 (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 3.98 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:
 DIP switch settings: Default position (It does not need adjustment.)
 This is the connection diagram for a 540 model and a multi-unit controller in the Multi-Unit System.
The example above shows three water heaters.
 The multi-unit controller automatically allocates the unit # (1-20) to each water heater in the Multi-
Unit System.
 In a Multi-Unit System, connect the “[1]” connector and the “[2]” connector with the communication
cable (refer to p. 9) or 18 gauge wire cables. The total cable length can be up to 250 ft (76.2 m) long.
 In a Multi-Unit System, 540 models can only be connected with other 540 models or 710 models.
 The multi-unit controller allocates random numbering. See the controller instructions to learn how
to renumber the system units sequentially.
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
DIP switches
Lower bank of
DIP switches
Lower bank of
DIP switches
1
2
3
4
5
6
1
2
3
4
5
6
Communicaon cable
Remote controller cable
Unit 1
Unit 2 Unit 3
Remote controller
supplied with controller
Terminals for
water heaters
100112691
(TM-MC02)
Remote controller
terminals
Cold IN
Hot Out
540
100112691
(TM-MC02)
Installaon
Installaon Manual
 For detailed instructions on the multi-unit controller, refer to the instructions
that are packaged with the multi-unit controller.
 If 710 and 540 models are to be connected together in a Multi-Unit System, refer to
the installation manual of the multi-unit controller for more details.
NOTICE