Aerco SmartPlate User Manual download pdf (Page 44)

SmartPlate Installation, Operation & Maintenance Manual

CHAPTER 6 – SCHEDULED MAINTENANCE

Page 44 of 138 AERCO International, Inc.  100 Oritani Dr.  Blauvelt, NY 10913 OMM-0069_0E

PRI: 11/26/2013 Phone: 800-526-0288 SP-100

Example:

BW inlet temperature = 180ºF

Domestic water setpoint = 140ºF

Calcium Hardness level = 40 mg/L

Heat exchanger Cleaning Frequency: Start out with semi-annually (every six months) schedule

(180ºF BW falls under semi-annually and the DHW setpoint and calcium hardness level fall

under annually). Observe the next few cleanings on how much scale is removed to determine if

an annual (yearly) cleaning frequency is more appropriate.

The domestic water differential pressure can also be checked to determine if the heat

exchanger needs cleaning. Check the differential pressure on the domestic water side of the

SmartPlate Heater as follows:

1. Turn OFF the external power circuit breaker to the SmartPlate and also turn OFF the

POWER Switch on the side of the ECS/SP Control Box.

2. Connect a hose to the DHW Drain Valve (Figure 6-2).

3. Close both Isolation Ball Valves on the DHW piping.

4. Open the Heater Drain Valve.

5. Remove the 1/4” NPT plug from the DHW Strainer to allow air to enter the piping while

draining.

6. When domestic water has drained, remove the 1/4” NPT plugs from the domestic water

inlet and DHW outlet isolation ball valves.

7. Refer to Figure 6-2 and Install pressure gauges at each 1/4" NPT connection on the DHW

piping where the 1/4" plugs were removed. Both gauges should have PSI scales which

have upper limits of 1.5 to 2 times the water inlet pressure and a resolution sufficient to

recognize a 5 psi pressure difference.

8. Close the DHW Drain Valve that was opened in step 4.

9. Connect a hose to the Blow-Down Valve on the Inlet Strainer. Open this Blow-Down Valve

on the Strainer to vent air during the filling process.

10. Open the lower Isolation Ball Valve (DHW Outlet).

11. Next, close the Blow-Down Valve on the Inlet Strainer and open the upper Isolation Ball

Valve (DHW Inlet).

12. Check the pressure readings on the gauges to ensure that the difference is 5 psig or less

at the design flow rate of the heater.

13. If the difference between the pressure readings is greater than 5 psig, this indicates that

the heat exchanger requires de-scaling. Refer to paragraph 8.2.1 for Heat Exchanger De-

Scaling procedure. For Double-Wall Models with harder scale deposits, manual cleaning

by disassembly can be performed (see paragraph 8.6.2).

14. After de-scaling, if the difference between the pressure readings is still greater than 5

psig, replace the plates or heat exchanger as necessary. Refer to paragraph 8.4 for

Single-Wall Heat Exchangers or 8.9 for Double-Wall Heat Exchanger replacement

procedures.

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Aerco SmartPlate User Manual Page 44

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