SmartPlate EV Installation, Operation and Maintenance Manual
CHAPTER 7
– TROUBLESHOOTING
OMM-0147_C
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TROUBLESHOOTING PROCEDURES Instructions
5. Refer to the applicable procedures in Chapter 8
–
Corrective Maintenance
if component
removal and/or replacement is required.
TABLE 7-1. Troubleshooting
– Control Valve and Piping Assembly
No.
Fault Indication
Probable Cause
Corrective Action
T1
System not operating.
Control Valve is closed
and outlet water temp. is
far below setpoint.
1. No power supplied to
Control Valve.
2. Control signal not being
supplied from Temp.
Controller.
1. See Control Valve wiring diagram in
Section 4.2.1
T2
System over-heats by
more than 10°F above the
desired setpoint.
Outlet temp is below
Over-Temp limit setting
1. Control Valve not fully
closed.
2. Temp. Controller not
set properly or
defective.
1. Check the 4 to 20 mA control signal being
supplied to Actuator. If signal is greater
than 4 mA when heater outlet
temperature is 10°F (or more) above the
desired setpoint, proceed to next item in
list.
2. Refer to Chapter 4
–
Adjustments
and
check current setting of Temp. Controller.
Readjust if necessary. If adjustment does
not clear fault, proceed to Table 7-2 and
continue.
T3
System outlet water
temperature is below
desired setpoint
1. Boiler water inlet
strainer is clogged
2. Boiler water temp is too
low.
3. Boiler water flow rate
too low.
4. Temp Controller is not
properly set.
1. Check the strainer. Blow down the
strainer.
2. Check the Boiler Water IN temperature
on the Control Box display indicator.
Verify that the temperature is equal to the
boiler water temperature to which the unit
was sized.
3. Check system pump and measure flow
rate to the Water Heater with an ultra-
sonic meter.
4. Refer to Chapter 4, section 4.2.3 and
check the current setpoint temperature
setting on the Temp Controller. If the
setting is below the desired setpoint,
readjust as necessary.
