Installation Sheet

29 Page
Installaon
Installaon Manual
 Each heater's No.8 DIP switch, located on the center computer board's lower bank of DIP switches,
should be in the OFF position.
 The diagram above shows an example of a Multi-Unit controller connected to six water heaters.
 The multi-unit controller automatically allocates the unit number (1-10) to each water heater
that is part of the Multi-Unit System. Make sure each 7-Seg LED of all the units’ center computer
boards displays the unit number. The lower LED will illuminate when the heater has linked to the
controller.
 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.
MULTI-UNIT SYSTEM
Multiple 910 models can be combined for a Multi-Unit System, along with the multi-unit controller
100112691(TM-MC02). Each multi-unit controller can control from 2 to 10 units for commercial or
residential applications. For a 10-unit system, the computer can modulate from 15,000 BTU/h to
3.8 million BTU/h.
An individual cut-off switch is recommended for each unit in a Multi-Unit System for the purpose of
maintenance.
Mul-unit
controller
Hot Out
Cold In
Multi-Unit System connection diagram
Multi-unit controller and temperature remote controller wiring:
For detailed instructions on the multi-unit controller, refer to the
instructions that are packaged with the multi-unit controller.
NOTICE
Multi-communication terminals
Each terminal : Max. 4 units
Multi-unit
controller
Communication cable
Water
heater
1
Water
heater
2
Water
heater
3
Water
heater
4
Water
heater
5
Water
heater
6
1
2
123
6
4
5
O
N
123
6
4
5
O
N
1
2
1
2
1
2
1
2
1
2
Temperature
remote
controller
Temperature
remote controller
terminals
DIP switch settings for Multi-Unit System
Lower bank of DIP switches
NO.8: 0FF
(Default)
ON
87654321