Paloma PH2-20R DVSN, Engineering Handbook

Page: 144 / 172

8
Manifold System Installation
Figure 3.3.a - Control Cable Installation at Water Heater
Number 4 Dip Switch
in the “ON” Position
Control Board Layout for fi rst and second generation models
Control Board Layout for third generation models
Dip Switch
Adjustment
Connector
“F”
Wire Clamp
Number 4 Dip Switch
in the “ON” Position
Dip Switch
Adjustment
Top Set
Connector
“F”
Wire Clamp
Disconnect the power from both the Manifold Controller and the
tankless water heater. Leave the power disconnected until all the
tankless water heaters in the system have been connected to the
manifold controller system.
The communication cable is a specialized cable designed speci fi -
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 three
wires, red, black, and white, will connect only the water heater ter-
minal. The other end, not marked but having two red wires, a white,
and black wire, will only connect to the manifold controller. Do not
attempt to use any other cable or wire than a manufacture 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.
Remove the front cover from the manifold controller; there are 4
(four) screws holding the front cover on to the unit.
Route the manifold controller end of the communication cable
through one of the holes with a grommet at the bottom of the con-
troller cabinet.
Connect the communication cable to one of the six (6) connectors
on the right had side of the manifold control board. See
fi gure 3.3.b
for location of the connections.
Section 3.3.b - Control Cable Installation at the controller
Figure 3.3.b - Control Cable Installation at Controller
Control Cable
Connectors
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.
Wire Clamp
Cable Through
Grommeted
Hole
Section 3.4 - Expansion Card Installation (optional)
When more than six (6) water heaters are needed in a manifold, an
optional manifold controller expansion card is available for installa-
tion in the cabinet. This expansion card will allow for the connection
of an additional fourteen (14) tankless water heaters to the system.
Disconnect the power from both the manifold controller and the
tankless water heaters. Leave the power disconnected until all the
tankless water heaters in the system have been connected to the
manifold controller system.
Remove the front cover from the manifold controller; there are 4
(four) screws holding the front cover on to the unit.
Mount the manifold controller expansion card in the top of the con-
troller cabinet, the two legs of the expansion card sit on the tabs, and
the card is secured with a single screw at the top. See
fi gure 3.4.a.
With the card securely mounted attach the wiring harness to the
card. There are 6 small molex connectors, each one of a difference
size, to each respective socket at the top middle of the expansion
card. Do not attempt to use any other cable or wire than the wiring
harness provided with the expansion card. Do not install the wires
backwards or force the connectors in to the sockets, damage to the
manifold controller can occur.
Main Control Board
Secure the cable in the cabinet with one of the wire straps and
screws as illustrated in
fi gure 3.3.b. Excess cable may be bundled
inside the controller cabinet.
Repeat these steps for each of the water heater control cables in the
manifold system.
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