OMM-0153_E
• 5/11/2023 Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST Page 86 of 124
CENTURION Installation, Operation & Maintenance Manual
SECTION 8: WATER HEATER MANAGEMENT
8.9 Troubleshooting
TABLE 8.9: WHM Troubleshooting
FAULT INDICATION
PROBABLE CAUSE
CORRECTIVE ACTION
Manager LEDs are
flashing on 2
Controllers
1.
Two Edge Controllers
have their WHM Mode
menu option set to WHM
Manager.
1.
Check the WHM Mode entries in the units
which have their displays flashing. Change one
of the WHM Mode settings to WHM Client.
MANAGER
LED on
one or more WHM
units is
Off
.
1.
Improperly connected or
faulty RS485 Modbus
wiring.
2.
Improper Comm address.
3.
Unit Comm address is not
unique.
1.
Check the polarity of the RS485 Comm
connections on the I/O board of the affected
unit. Also, ensure that all Modbus wiring
connections to the unit are secure.
2.
Verify that the address of the affected unit is
within the allowable range (1 thru 16).
3.
Check to ensure that none of the units have the
same Comm address.
Actuator-controlled
Sequencing Valve
does not open
1.
Control cable not
connected to valve
actuator.
2.
24 VDC power not being
supplied to valve
actuator.
3.
Defective valve actuator.
1.
Ensure that the control cable from the unit’s I/O
Box is connected to the valve actuator.
2.
Remove the enclosure cover from the valve
actuator and verify that 24 VDC is present at
Terminal 2 of the actuator.
3.
Replace valve actuator. Following replacement,
the actuator stroke will have to be calibrated to
ensure it fully opening and closing.
8.10 Sequencing Valve Description & Operation
Installation of the Sequencing Isolation Valve (P/N
21008C
) is described in Section 2.13.
Figure 8-15: Actuator-Controlled Sequencing Valve (P/N 21008C)
The Actuator Housing contains a cover which is removed by simply loosening a single captive
screw. Removing the cover provides access to a PC Board containing wiring connections and
control circuitry components as shown.
ACTUATOR
3”
BRASS BALL
VALVE
