AERCO Electronic Control Valve - Manual (Page 21)

VA-115 INSTRUCTIONS – ELECTRONIC CONTROL VALVE, CXT-E
7-1
7 - TROUBLESHOOTING
INTRODUCTION
This Section provides the troubleshooting procedures necessary to isolate faults to the most probable
cause(s) for a malfunction of the 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 (if used) or any other ancillary
equipment manuals included with the installation configuration.
1. Verify that all piping connections have been made in accordance with Figure 2-1 (Steam Flow) or
Figure 2-2 (Hot (Boiler) Water Flow).
2. Ensure that the Control Valve is installed with the flow arrow on the Valve Body pointing in the
direction of flow.
3. Ensure that both the upstream and downstream shutoff valves are fully open.
4. Check to ensure that the 3-pin Molex connector on the CXT-E Actuator is properly connected to an
AERCO Electronic Control System (ECS) or other type of Controller being used. Proper electrical
connections are as follows:
• Pin 1: Common
• Pin 2: +24 VDC
• Pin 3: 4-20 mA Control Signal
TROUBLESHOOTING PROCEDURES
The troubleshooting procedures for the Control Valve, Type CXT-E are provided in Table 7-1. When a
fault occurs, proceed as follows:
1. Refer to the FAULT INDICATION column in the Table 7-1 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.