Manual

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: