AERCO SmartPlate User Manual
Page 48
SmartPlate Installation, Operation & Maintenance Manual
CHAPTER 7 – TROUBLESHOOTING
Page 48 of 138
AERCO International, Inc.
100 Oritani Dr. Blauvelt, NY 10913
OMM-0069_0E
PRI: 11/26/2013
Phone: 800-526-0288
SP-100
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 MXG-461 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. Remove Valve Electronics Module cover
(Figure 4-1) and verify that 24 VAC power
is present at pin 1 of terminal strip.
Restore power if necessary. Proceed to
Table 7-2 and check Over-Temp Switch
and 24 VAC Transformer circuit breaker to
ensure they have not tripped.
2. Verify presence of a 0 to 10 VDC control
signal at pin 5 of terminal strip. If control
signal is not present, troubleshoot
ECS/SP per Table 7-2.
T2
System over-heats by
more than 10°F above the
desired setpoint.
Outlet temp is below
Over-Temp limit setting
1. Control Valve is in
the MANUAL mode.
2. Control Valve not
fully closed.
3. Temp. Controller not
set properly or
defective.
4. Control Valve not
calibrated correctly
5. Heat Exchanger
scaled on DHW side.
1. Ensure Control Valve is set to the AUTO
mode.
2. Check the 0 – 10 VDC control signal
being supplied to Actuator. If signal is
greater than 0 VDC when heater outlet
temperature is 10°F (or more) above the
desired setpoint, proceed to next item in
list.
3. 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.
4. Refer to Chapter 4, para. 4.2 and auto-
calibrate the valve by pressing the button
(Figure 4-2). If Valve stem does not fully
stroke up and down, contact AERCO for
assistance.
5. Clean and de-scale Heat Exchanger.