AERCO Electronic Controls System (ECS) - Manual (Page 35)

Electronic Control System (ECS) and Type CXT-E Valve
6. ROUTINE MAINTENANCE
VD2: 02/28/14 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, New York 10913 • Phone: 800-526-0288 Page 35 of 82
AC-105 OMM-0003_0D
6. ROUTINE MAINTENANCE
6.1 INTRODUCTION
The following paragraphs provide the AERCO recommended routine maintenance procedures for the
Electronic Control Valve Type CXT-E and the Electronic Control System (ECS).
6.2 CXT-E CONTROL VALVE ROUTINE MAINTENANCE
6.2.1 Monthly Maintenance
Once each month, check the Control Valve for leakage as follows:
1) Refer to Figure 6-1 and check the Packing Nut and Valve Top for evidence of leakage.
CAUTION
Over-tightening the Packing Nut may trap the Valve Stem and
slow or stop Valve motion.
a) If there is leakage between the Packing Nut and Valve Top, tighten the Packing Nut
until the leakage stops. DO NOT FORCE the Packing Nut.
b) If tightening the Packing Nut does not stop the leak, the Packing Nut and Packing
Assembly must be replace in accordance with the procedures specified in the Control
Valve CORRECTIVE MAINTENANCE Section.
INDICATOR
PLATE
VALVE
TOP
PACKING
NUT
P/O LINKAGE
ASSEMBLY
LOWER
SHAFT
Figure 6-1. Valve Shaft Seals
6.2.2 Semi-Annual Maintenance:
Every six months, check the following items:
1) Refer to Section 3 - ADJUSTMENT and perform the Actuator adjustment procedure
specified. Verify that the Actuator strokes the Control Valve from the fully closed to the fully
open position.
2) Clean the Strainer in the heating fluid line (Figure 2-1 or Figure 2-2) in accordance with the
instructions furnished with the Strainer.
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