Air Products Gasguard 250, Installation Manual

Page: 32 / 68

Gasguard
®
250 VMB System Installation Manual
Air Products and Chemicals, Inc. Page 4 - 2
Figure 4.0: Electrical Diagram
4.1 Grounding Method
The equipment must be grounded in accordance with Article 250 - Grounding in
the National Electrical Code 1993. The customer is responsible for connections to
earth ground. A ground lug is supplied on the controller as well as the plenum of
the gas cabinet for customer hookup to the facilities grounding network. Figure
4.1 shows a suggested grounding method for a typical system. This drawing may
not be applicable to your specific system.
Figure 4.1: Suggested Grounding Method
ON
OFF
T1 T2
T7
T11
Power Switch
Solenoid 1-8 Solenoid 9-16
Digital Outputs
Fuse 1.5 Amp
AC/DC Power
Supply
Digital Inputs
Ground
Line
Neutral
AC In