AERCO Electronic Control Valve - Manual (Page 9)

VA-115 INSTRUCTIONS – ELECTRONIC CONTROL VALVE, CXT-E
2-1
2 - INSTALLATION
INTRODUCTION
The installation procedures contained in this section apply to all sizes of AERCO Electronic Control
Valves, Type CXT-E, ranging from 1 inch to 4 inches. These procedures can be used for both steam and
hot (boiler) water flow systems.
ELECTRONIC CONTROL VALVE TYPE CXT-E INSTALLATION
Basically, the installation procedures for the Electronic Control Valve consist of:
• Installing the CXT-E Electronic Control Valve and associated steam or hot (boiler) water piping and
components.
• Connecting external electrical power and control signals to the Control Valve Actuator
Proceed as follows:
1. Refer to Figure 1-1 for dimensions of the Control Valve furnished with the Packaged Water Heater.
2. Next, refer to the recommended installation drawing in Figure 2-1 for steam flow, or Figure 2-2 for hot
(boiler) water flow.
3. Install the Control Valve with the Actuator Linkage in the vertical, upright position as shown in Figure
2-1 or 2-2.
4. For maintenance purposes, unions are required with threaded ends to simplify removal from the
steam or hot boiler water line.
5. Blow out all pipe lines to clear them of dirt chips, scale or other foreign matter which could adversely
affect Valve operation when in service.
6. Install an in-line strainer upstream of the Valve as shown in Figure 2-1 (steam) or Figure 2-2 (hot
boiler water). This will protect against foreign matter reaching the Valve during service operation.
7. If the Valve is controlling steam, ensure that the steam line is properly trapped to prevent
accumulation of condensate ahead of the Valve.
8. Install Shutoff Valves (metal-seated, gate-type) upstream and downstream of the Control Valve to
permit removal from the line for maintenance.
9. Pressure gauges should be installed on both sides of the Control Valve as shown in Figure 2-1
(steam) or Figure 2-2 (hot water).