Installation Manual

H-Series Demand Duo™ 2 Installation and Operation Manual 31
1. Route the communication cable from the digital controller through the bottom side of the tankless
water heater.
2. Plug the communication cable into the serial port located at the front top side of the tankless PC
Board.
To connect the communication cable:
PC
Board
serial
port
Communication
Cable
Figure 3: PC Board Assembly
Primary
PC Board
Secondary
PC Board
EZ Connect
Cable
Accessory
Cable
Accessory
Port
Accessory
Port
“EZ Connect”
To connect the EZConnect™ cable:
1. On the primary water heater, connect
the Accessory Cable to the Accessory
Port at the bottom of the PC Board
(Figure 3).
2. Connect one end of the EZConnect™
Cable to the Accessory Cable labeled
“EZ Connect” (Figure 3).
3. Connect the other end of the
EZConnect™ cable to the top
Accessory Port on the PC board of the
secondary water heater (Figure 3).
4. Securely tighten the EZConnect™
cable to the bottom of both water
heaters by using the cable clamp and
screw.