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iN401 - iN501 Connecting
Multiple
Units
48
May
2019
-
Revision
00
13. Connecting Multiple Units
13.1 General Information
Multiple units can be connected together to supply large
demands of hot water.
The water heaters communicate through a cable connection
between each water heater. The benefits of connecting the
units are:
• When demand for hot water is low, fewer units will operate.
• If one unit has an error code, the others will continue to
operate.
• Changing the settings (temperature, time, etc.) on one unit
changes settings on all the units.
• It allows shut down of one unit for maintenance while the
others continue to operate.
13.2 Installation Procedure
1. Connect all the units to a gas supply pipe. Make sure the
pipe is properly sized in accordance with the BTU draw
and number of units being operated. Refer to “6. Gas
Connection” on page 14 for additional information.
2. Connect all the units to the power supply. Refer to “9.
Electrical Power” on page 31 for additional information.
Main Supply
Line
Drip
Leg
Drip
Leg
Drip
Leg
Drip
Leg
Manual
Shut-off
Valve
Manual
Shut-off
Valve
Manual
Shut-off
Valve
Manual
Shut-off
Valve
3. Install the combustion (fresh) air intake and exhaust
outlet pipes. Refer to “7. Air Intake Inlet and Exhaust Gas
Outlet Pipe Connections” on page 19 for additional
information.
4. Install and connect the hot water lines. If an optional hot
water storage tank is required, connect the hot water
lines to this tank. Make sure the water pipe is properly
sized in accordance with the number of units being
operated.
5. Install and connect the cold water lines. Make sure the
water line is properly sized in accordance with the number
of units being operated.
6. Connect and route the condensate drain lines to a suitable
discharge location. Refer to “8. Water Connections” on
page 28 for additional information.
7. Do Not
connect communication cables at this time.
8. Power up all the units and assign a unique number, one
through four to each unit. Set the STAGING to ON.
WARNING
Before making any adjustments or connections inside
the water heater cabinet, make sure the power is
disconnected. Unplug the water and/or turn the circuit
breaker OFF.
9. If necessary, press the Power button to turn OFF each
water heater in the system and disconnect power from all
the units in the system.
NOTE: It is necessary to wait a minimum of 30 seconds
here