AERCO Electronic Controls System (ECS) - Manual (Page 41)

Electronic Control System (ECS) and Type CXT-E Valve
7. TROUBLESHOOTING
VD2: 02/28/14 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, New York 10913 • Phone: 800-526-0288 Page 41 of 82
AC-105 OMM-0003_0D
7. TROUBLESHOOTING
7.1 INTRODUCTION
This Section provides the troubleshooting procedures necessary to isolate faults to the most
probable cause(s) for a malfunction of the Electronic Control System (ECS) or Electronic
Control Valve Type CXT-E. Prior to performing the troubleshooting steps and procedures
specified in this Section, perform the following preliminary checks:
NOTE:
In addition to the procedures contained in this Section, also check the
Troubleshooting Sections of the AERCO Heat Exchanger Manual
and any other ancillary equipment manuals included with the
installation.
7.1.1 Electronic Control System (ECS) Preliminary Check:
a) Check to ensure that all ECS electrical cable connections are secure.
b) Ensure that the CXT-E Control Valve actuator is connected to the Control Box cable plug.
7.1.2 Electronic Control Valve, CXT-E Preliminary Check:
a) Verify that all connections have been made in accordance with Figure 2-1 (Steam Flow)
or Figure 2-2 (Hot (Boiler) Water Flow).
b) Ensure that the Control Valve is installed with the flow arrow on the Valve Body pointing
in the direction of flow.
c) Ensure that both the upstream and downstream shutoff valves are fully open.
7.2 TROUBLESHOOTING PROCEDURES
The troubleshooting procedures are provided in Table 7-1 (Control Valve CXT-E) and Table 7-2
(ECS) which follow. Also, when troubleshooting ECS faults related to the Temperature
Controller (Eurotherm, Model 2408), additional information concerning process fault and
diagnostic alarms is included in Appendix A. When a fault occurs, proceed as follows:
1) Refer to the FAULT INDICATION column in the following tables and locate the fault that
best describes the existing conditions.
2) Proceed to the PROBABLE CAUSE column and, if more than one item is listed, start with
the first item shown for the fault condition.
3) Perform the corresponding checks and procedures listed in the CORRECTIVE ACTION
column for the first PROBABLE CAUSE.
4) Continue checking each additional PROBABLE CAUSE for the existing fault until the fault
has been corrected.
5) Refer to the applicable procedures in Section 8 – CORRECTIVE MAINTENANCE if
component removal and/or replacement is required.