Paloma DUOnex 2-Unit System - Manual

connector will only fi t one way. Press until the connector
snaps into place.
Secure the DUOnex™ Cable with the clamp and screw
provided to the bottom of the control board (see fi gure 1).
Change the #4 dip switch setting to the “ON” position
(see fi gure 1 inset).
Pass the other end of the DUOnex™ Cable through the
grommeted hole in the bottom of the second unit.
Plug the cable into the connector marked “F” in the
upper right hand corner of the control board (see fi gure
1). The connector will only fi t one way. Press until the
connector snaps into place.
Secure the DUOnex™ Cable with the clamp and screw
provided to the bottom of the control board (see fi gure 1.)
Change the #4 dip switch setting to the “ON” position
(see fi gure 1 Inset)
Attach the front cover on each unit, and turn on the
power, gas, and water.
Turn on the remote control and wait about one minute.
If there is no error code displayed, the setting is com-
pleted.
Set the temperature at 110ºF (43ºC) and test the units by
turning on a tub or shower fi xture.
Notice: The DUOnex™ System is designed to electroni-
cally control two tankless water heaters operating as one.
Depending upon the hot water demand, one or both units
may be in operation. To test both units, increase the hot
water fl ow by turning on more than one hot water appliance
or fi xture.
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5.
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Install two tankless water heaters of the same model to-
gether, in a parallel plumbing application (see fi gure 2),
according to the instructions in the Instruction Manual.
Make sure power is disconnected and turn off gas and
water to both water heaters, then remove the front
cover from each unit.
Feed one end of the DUOnex™ Cable through the
grommeted hole in the bottom of the fi rst heater.
Plug the cable into the connector marked “F” in the
upper right hand corner of the PCB (see fi gure 1). The
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Tankless Water Heater DUOnex™ 2-Unit System
Installation Instructions
It is very important that all persons who are expected to install, oper-
ate or adjust this DUOnex™ System and/or water heater, read these
instructions along with those instructions provided with the tankless
water heater.
Recognize this symbol as an indication of Important Safety
Information!
Refer to the Instruction Manual provided with your tankless
water heater for the proper installation procedures.
!
The DUOnex™ System is designed for use with the following models:
PH-16 FIS PH-28RIFS/ROF-1 PTG2-42PV
PH-20R IFS/OF/DVS PH-28CIFS/COF-1 PTG-53PV/X/DV
PH-28R DVS/C DVS PTG-74PV/X/DV-1
1
Printed in U.S.A.
This kit contains:
1 - DUOnex™ Cable, 2 - Cable Clamps, and 2 - Screws
ON
1 2 3 4 DIP1
ON
OFF 1 2 3 4
SW1 SW2
SW3
ON
1 2 3 4
DIP1
ON
OFF
1 2 3 4
Control Board - Figure 1
DUOnex™
Cable
Cable clamp
and screw
Connector
“F”
Dip
Switch
NOTICE: A remote control is included with each
water heater. When using the DUOnex™ System, only
one (1) remote control is needed. Connect one remote
control to either water heater following the instructions
provided in the Instruction Manual. Keep the unused
remote control as a spare. The installed remote control
will control temperature and functionality at both
water heaters.
Figure 1.inset
Dip Switch
Position #4
PII 31-51791 (06/06)
LED
R