Paloma PH2-20R OFN Engineering Handbook page 154

Section 3.2.b - Control Cable Installation at the controller
Disconnect the power from all tankless water heaters. Leave the
power disconnected until all the tankless water heaters in the sys-
tem have been connected to the manifold controller system.
Route the manifold controller end of the communication cable , the
one with the small molex connector, through one of the holes with
a grommet at the bottom of the main tankless water heater cabinet.
Only three cables will fi t through a single opening, there are two
opening for cables.
Connect the communication cable to one of the six (6) connectors
across the bottom of the manifold control board. See fi gure 3.2.b for
location of the connections.
Secure the cable in the cabinet with one of the wire straps and
screws as illustrated in fi gure 3.2.b. Excess cable may be bundled
under the water heater.
Repeat these steps for each of the water heater control cables in the
manifold system.
Figure 3.2.b - Control Cable Installation at Controller
Main Control Board
Cable Through
Grommeted Hole
DO NOT turn on the power to the water heaters or
controller until all communication cables are connected
to the water heaters and the manifold controller.
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Manifold System Installation
Status LED
Control Cable
Connectors
Wire Clamp
Section 4 - System Start Up
Once the tankless water heaters have been setup and remote con-
trol has been installed as instructed in Section 3, you may begin the
startup process.
Remove the front cover from the main tankless water heater with the
manifold controller; there are 4 (four) screws holding the front cover
on to the unit.
Shutoff all water fl ow from the system.
Turn on the gas supply to the tankless water heaters.
Plug in or turn on the power supply to all the tankless water heaters.
Wait 30 seconds after the last unit has had the power turned on.
An LED indicator will light up "solid" above each connector were a
control cable is plugged in to the manifold control board. If the LED
indicator next to a connector begins to blink or does not light then
an error has occurred with the communication to the water heater.
Check the diagnostic display for an error code and recheck all con-
nections. Make sure the #4 Dip switch is in the "ON" Position at each
water heater. If an error occurs then the entire start up process will
need to be repeated.
Press the power button on the remote control, it should now display
the water temperature.
Turn on or start a low hot water demand or fl ow. The burner on
indicator light on the remote should come on once the system has
started to fi re.
Increase the hot water demand or fl ow to turn on additional units in
the system. Continue to increase the fl ow rate until all the units in
the system are running.
Once the system is running, stop the water fl ow, disconnect power
to all the tankless water heaters, and reinstall the covers. Reconnect
power and verify operation.
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