IM 781-2 Page 19
Field Wiring
Following are descriptions of the various field-wiring requirements. A typical CSM field-wiring diagram is shown in Figure
24. Wiring must comply with the National Electrical Code and all local codes and ordinances. Failures caused or
contributed to by wiring not in accordance with these instructions will not be covered by warranty.
Power Wiring
Building power is wired directly to the transformer supplied with the CSM. Wire the CSM to an external switch or breaker,
as there is no disconnect switch in the unit. Some local codes require the switch to be in sight of the unit. The switch must
be capable of 120VAC service (240VAC depending on model) to switch the transformer primary.
About the CSM Transformer
The CSM ships with a 120VAC (or 240VAC depending on model), 50/60 Hz transformer and 12V battery. The
transformer provides power to the controller in a 14-CT-14 configuration (28VAC center tapped). The power connector
has been disconnected for shipping.
The following should be noted about the CSM transformer:
!
WARNING
Shock and equipment damage hazard.
Connect wiring to the supplied transformer. All connections must be made in accordance with national and
local electrical codes. Use copper conductors only.
Do not power other devices from the transformer of the CSM. The transformer must be dedicated to running
the CSM.
Do not attempt to use any other power source or otherwise defeat the isolation provided by the integral
transformer. A two-wire power source, including a 24V transformer, can cause permanent damage or greatly
shorten the life of the unit.
Verify that neither side of the transformer's secondary winding is connected to earth ground or building
neutral.
Making the Power Connection to the CSM Transformer
With the 6-position power connector disconnected from the PCB, unscrew the nut and locking washer and remove the
metal enclosure of the transformer.
Note: Code typically requires high voltage “Class 1” wiring to be confined behind the transformer’s enclosure divider.
Replace this barrier after completing the wiring. Do not pinch wires underneath the barrier when re-installing the barrier.
On 120 VAC models, using the provided wire nuts, connect 120 VAC, 50/60 Hz power to the transformer and power
connector using the information in Table 1.
Table 1. 120 VAC models building power termination
Building Power Source Termination point
Type of Wire Typical Color of Wire
Ungrounded—Hot Black Either wire of the 120V transformer
Grounded—Neutral White Other wire of the 120V transformer
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