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Application – Powers 744 Series Accritem Rigid and Remote Bulb Blind Controllers - Rigid Bulb User Manual

Page 7

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7

Figure 8.

Additional information on controller action and applications.

Continued

Operation

n

APPLICATION

HEATING

COOLING

MIXING

DIRECT Acting

Normally OPEN valve

Normally CLOSED valve

Hot piped to Normally OPEN

port of valve

Valve OPENS on air failure

Valve CLOSES on air failure

Valve opens to HOT flow

on air failure

REVERSE Acting

Normally CLOSED valve

Normally OPEN valve

Hot piped to Normally CLOSED

port of valve

Valve CLOSES on air failure

Valve OPENS on air failure

Valve opens to COLD flow

on air failure

ACTION: