Paloma PH2-20R OFN, Engineering Handbook

Page: 142 / 172

6
The Manifold control system is designed with system redundancy
in mind. If a failure were to occur within a tankless water heater,
the system will shut that unit down, bypass it, and display an error
noti
fi cation on the remote control display.
When an error occurs the remote will fl ash the error code, unit
number or temperature. This shows that the system has taken that
heater out of service and is continuing operation with the remaining
units.
To review the heater trouble codes, open cover on the MIC-185 , on
the main control board, the LED display will show the error code on
the right, and the unit on the left.
Some errors can be corrected by power cycling the system, turn off
the power at the remote control, disconnect power to the MIC-185
and all water heaters. Reconnect power to all water heaters
fi rst,
then the MIC-185, wait for the start up cycle to complete and power
on the system, If failure still occurs contact Technical Service.
Section 2.1 COMMON ERROR CODES
Code Description/Resolution
82 EEPROM Error / Contact Technical Services
76 Remote Control Communication Error / Contact
Technical Services
1L Lime Condition / Follow Flush Procedure in Water
Heater Use and Care Manual
Manifold System Operation / Installation
Section 2.0 - When Trouble Occurs
NOTICE: Follow instructions provided with the water heater for
installing the water heater and main remote control. The main
remote control is provided with the water heater.
Section 3.0 - Location
The MIC-185 Manifold Control System
can be installed indoors
or outdoors. The cabinet is designed to be weather resistant.
The system requires the use of a Main Remote Control (UMC-117),
one is included with each water heater, that must be installed in-
doors and per instructions provided with the water heater. Only in-
stall one Remote Control with this manifold system.
Section 3.1 - Mounting the Manifold Controller Cabinet
Make sure the location of the manifold controller allows easy access
for service and operation.
Wall studs should be utilized when mounting the manifold control-
ler to the wall. Alternately, a suitable piece of wood may be placed
inside or outside of the wall to span the distance between the wall
studs. Fasten the manifold controller cabinet mounting brackets to
the wood. In case of dry wall or concrete wall use appropriate dry
wall anchors or lag bolts.
Install a wood screw to hang the cabinet by the upper bracket, leave
the head of the screw out with a clearance of 1/8” (3 mm) from the
wall. Hang the cabinet by center slot of the upper bracket on the
screw. Use a level to square the cabinet and using a wood screw
and washer, af
fi x the lower bracket to the wall (Left and right). Re-
peat to af fi x the top bracket. See Figure 3.1.a for typical mounting of
the manifold controller.
Figure 3.1.a - Mounting Controller Cabinet
Screw for Installation
Hanging, leave head
sticking out 1/8”
Wood Screw or
Appropriate Fastener
with Washer
Upper Mounting
Bracket
Lower Mounting
Bracket
(Underneath)
Section 1.5 - Maximum Temperature Adjustment
The factory default temperature setting is 120°F. Follow these in-
structions to set the system to allow Higher Temperature operation.
Follow the instructions below if it is determined that a setting of up to
140°F (185°F with a Commercial Conversion Kit) is required.
Turn on the remote control. Turn off the gas and water shutoff valves.
Press the UP arrow temperature adjustment button on the remote
control for several times and set the temperature at 120°F (49°C).
Press and hold the UP button on remote control for more than 5 sec-
onds. Number (120) on the display of the remote control will begin
to blink.
While the number is blinking, push the UP arrow temperature adjust-
ment button and the Down arrow temperature adjustment button at
the same time. The display of the remote control will show “140”.
Push the UP or Down button to set desired temperature.
Turn on the gas and water shut off valves.
Check and ensure safe operation and performance of the water
heater.
For temperatures with a max of 185°F, each Tankless water heater
is required to have a Commercial Conversion kit installed.
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