SmartPlate Installation, Operation & Maintenance Manual
CHAPTER 6
– SCHEDULED MAINTENANCE
OMM-0069_0H
• SP-100 • 1/30/2020 Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST Page
44
of
134
OVER-TEMP SWITCH CHECK Instructions
2. Verify that an Over-Temp Alarm is generated and the following events occur:
a) The Control Valve (Siemens MXG-461) closes.
b) The Over-Temp Switch generates an audible alarm.
3. Following successful completion of the Over-Temp alarm check, return the Over Temp
Switch setting to its original setting (20°F above the unit’s setpoint).
6.5 STRAINER INSPECTION AND CLEANING
Every 6 months, check and clean the Strainers in both the Boiler Water and Domestic Water
piping of the unit. Perform the following steps for each Strainer:
STRAINER INSPECTION AND CLEANING Instructions
1. Attach a hose to the blow-down valve at the base of the Strainer. Cycle the blow-down
valve open and closed 6 times.
2. If the Strainer cannot be cleared using the procedure described above, refer to Chapter 8
–
Corrective Maintenance
, section 8.12.
6.6 CONTROL VALVE OPERATIONAL CHECK
Refer to Chapter 4, section 4.2 and recalibrate the Control Valve. Also, check the LED indicator
to ensure the Valve is functioning correctly.
NOTE:
To avoid repeated draining of the Water Heater, perform the annual scheduled maintenance
checks specified in section 6.9 at the same time.
6.7 TEMPERATURE SENSOR CHECKS
SmartPlate Water Heaters contain a Feed-Forward Temperature Sensor in the Mixing Box and
a Dual Temperature Sensor in the DHW Outlet Port. Once each year, these Sensors should be
checked to ensure there is no scale build-up.
TEMPERATURE SENSOR CHECKS
Instructions
1. Turn the POWER switch on the side of the ECS/SP Control Box to
OFF
to disconnect AC
power from the unit.
2. Close the Inlet and Outlet Isolation Valves on the Boiler Water and DHW lines of the unit.
3. Connect a hose to the Drain Valve and run it to a convenient floor drain. Open the Drain
Valve near the DHW Outlet to drain the water from the pipes and heat exchanger.
4. Disconnect and remove the Single Feed-Forward Sensor from the Mixing Box and the Dual
Outlet Temperature Sensor from the DHW Outlet Port (Figure 6-1).
