AERCO SmartPlate - Manual (Page 84)

SmartPlate Installation, Operation & Maintenance Manual
CHAPTER 8 – CORRECTIVE MAINTENANCE
Page 84 of 138 AERCO International, Inc.  100 Oritani Dr.  Blauvelt, NY 10913 OMM-0069_0E
PRI: 11/26/2013 Phone: 800-526-0288 SP-100
b. Hose and wash off screen.
c. Reinstall screen and replace Strainer end cap.
1. Close both Isolation Ball Valves in the Boiler Water piping (Figure 8-23).
2. Connect a hose to the Blow-Down/Drain Valve at the lower Strainer and open it to drain
the piping. It may be necessary to temporarily loosen a union on the Control Valve to
allow air into the piping.
3. Refer to Figure 8-10 and loosen the two compression fitting nuts on the Differential
Pressure Gauge tubes which are inserted into the brass Strainer body.
4. Pull and wiggle the tubes and Gauge and lift the assembly straight upward to remove it
from the Strainer.
5. Next, loosen the nuts on the Gauge body fittings and extract the tubes for use on the
replacement Differential Pressure Gauge.
NOTE
The tube fittings are pass-thru type fittings that allow the tube to
slide through the fitting without hitting a stop. Prior to installation,
make sure that the replacement Gauge has the same type of
fittings.
6. Install the tubes on the replacement Differential Pressure Gauge.
7. Insert the free ends of the tubes into the Strainer body and tighten the compression
fittings. DO NOT over-tighten the compression fittings.
8. Tighten the Control Valve union that was loosened in step 2.
9. Close the Blow-Down Drain Valve and open both Isolation Ball Valves (Figure 8-23).
10. Place the Heater back in service and check for leaks. If the Strainer is clean and the flow
is within specification for the SmartPlate Heater Model, the pointer on the Differential
Pressure Gauge should be in the Green zone on the dial.
Figure 8-25. Differential Pressure Gauge/Strainer/Ball Valve Combo