SmartPlate Installation, Operation & Maintenance Manual
CHAPTER 7
– TROUBLESHOOTING
OMM-0069_0H
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TABLE 7-1. Troubleshooting
– Control Valve MXG-461 and Piping Assembly
No.
Fault Indication
Probable Cause
Corrective Action
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 differential pressure
gauge. If ga
uge is in the “RED” area,
blow down the strainer and re-check until
gauge is in the “GREEN” area.
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.
T3
(Continued)
5. Control Valve is not
opening properly.
6. Heat exchanger is
fouled on boiler water
side.
7. Heat exchanger is
scaled on boiler water
side
8. Heat exchanger is too
small for load.
5. Remove Electronics module cover on
Valve and view the Status LEDs. See
Table 7-1A to check the Valve status.
6. Proceed as follows:
a. Close isolation valves
b. Clean strainers
7. Clean or de-scale heat exchanger.
8. Reduce load or resize heat exchanger.
T4
Wide variation in Water
Heater outlet temperature
during wide variations in
flow
1. ECS/SP mixed water
temperature sensor is
not functioning properly
2. DHW internal
Recirculation Pump is
not functioning properly
1. Refer to Table 7-2 and check the
operation of the mixed water temperature
sensor.
2. Proceed as follows:
a. Check the fuse on the side of the
ECS Control Box and replace if
blown.
b. Check input power to Recirculation
Pump.
c. Check the temperature of the copper
tube above the Pump. It should be the
same as the outlet DHW temperature.
If cold, repair or replace pump as
required.