John Wood Takagi - 240H-340H-540H - Manual (Page 30)

30
Page
MULTI-UNIT SYSTEM
Multiple T-H3-DV / 540H units can be combined for a multi-unit system, along with the multi-unit
controller (TM-MC02). The multi-unit controller can control 2 to 20 units. 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:
• T he dark squares should not need adjustment.
• T his is the connection diagram between T-H3-DV / 540H and multi-unit controller
for 2 to 20 water heaters. Above is a sample for 3 water heaters.
• T he multi-unit controller automatically allocates the unit # (1-20) to each water
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. 27) or 18 gauge wire cables. The total cable
length can be up to 76.2 m (250 ft.) long.
For detailed instructions on the multi-unit controller, refer to the
instructions that are packaged with the multi-unit controller.
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
Communication cable
Remote controller cable
Unit 1 Unit 2 Unit 3 Remote controller
Terminals for
water heaters
TM-MC02
Remote controller
terminals
Cold IN Hot Out
T-H3-DV / 540H
TM-MC02
Installation
Installation Manual