Paloma PH2-20R OFN Engineering Handbook page 153

Section 3.2 - Manifold Control Cable Installation
The manifold controller communicated with each tankless water
heater in the system through a communication cable. Each end of
the cable connects to the control board and tankless water heater
control board using a molex connector. The cable can only be con-
nected one way, do not force the connections as damage to both the
cable and control boards can occur.
NOTICE: The tankless water heaters connected to this system
must be of the same type and model, do not connect heaters of
different types or capacities to this system.
This instructions assumes the tankless water heaters have been
installed according to their respective instructions in a parallel mani-
fold installation.
Figure 3.2 - Manifold Control Cable Installation - Master
Connector "F"
on Water Heater
Control Board
Manifold
Control Cable
Connect the small molex connector of the short manifold control
cable, provided with the controller, to the Number 1 position on the
manifold controller board.
Connect the large molex connector of the short manifold control ca-
ble to the Connector "F" on the tankless water heater control board.
Change the DIP1 switch #4 setting on the control board of the water
heater to "ON" position (UP) in order to switch the water heater to
the manifold installation mode. DO NOT alter any other DIP switch.
See fi gure 3.2.a for DIP switch location on water heater PCB.
Section 3.2.a - Control Cable Installation at tankless heater.
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.
The communication cable is a specialized cable designed specifi -
cally to connect to the tankless water heater and manifold controller.
The communication cable has two Molex plugs, one at either end.
One plug, the end marked "water heater side" and having the larger
connector, will connect only the water heater terminal. The other
end, with the smaller connector, will only connect to the manifold
controller. Do not attempt to use any other cable or wire than a man-
ufacture approved communication cable. Do not install the cable
backwards or force the connectors in to the sockets, damage to the
water heater and/or manifold controller can occur.
Manifold System Installation
Water Heater Manifold
Control Cable Slots 1 - 6
Remove the front cover from the tankless water heater; there are 4
(four) screws holding the front cover on to the unit.
Route the water heater end of the communication cable through one
of the holes with a grommet at the bottom of the water heater.
Connect the communication cable to the connector marked "F" on of
the water heater control board. See fi gure 3.2.a for location of con-
nector "F" on either the fi rst and second or third generation models.
Figure 3.2.a - Control Cable Installation at Water Heater
Control Board Layout for third generation models
DIP 1 Number 4
Switch in the "ON"
Position
Wire Clamp
Secure the cable with the wire clamp and screw included with the
cable to the edge of the control board as illustrated in fi gure 3.2.a.
NOTICE: The DIP switch settings on the water heaters
must be changed for the water heaters to be controlled
by the manifold controller.
Change the DIP1 switch #4 setting on the control board of the water
heater to "ON" position (UP) in order to switch the water heater to
the manifold installation mode. DO NOT alter any other DIP switch.
See fi gure 3.2.a for DIP switch location on water heater PCB.
Attach front cover of water heater.
Repeat these steps for each of the water heaters in the manifold
system.
DO NOT turn on the power to the water heaters until
all communication cables are connected to the water
heaters and the manifold controller.
7
Dip Switch
Adjustment
Top Set
Connector
"F"
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