124 customer.honeywell.com 70-6925
Averaging Relay ...................................................................................................... 143
Ratio Relay ............................................................................................................. 144
Pneumatic Potentiometer ........................................................................................ 144
Hesitation Relay ...................................................................................................... 145
Electrical Interlocking Relays .................................................................................. 145
Electric-Pneumatic Relay ................................................................................... 145
Pneumatic-Electric Relay ................................................................................... 145
Electronic-Pneumatic Transducer ........................................................................... 146
Pneumatic Switch ................................................................................................... 146
Manual Positioning Switch ...................................................................................... 146
Pneumatic Control Combinations .................................................................................................................................. 147
General ................................................................................................................... 147
Sequence Control ................................................................................................... 148
Limit Control ............................................................................................................ 148
Manual Switch Control ............................................................................................ 149
Changeover Control For Two-Pressure Supply System ......................................... 149
Compensated Control System ................................................................................ 150
Electric-Pneumatic Relay Control ........................................................................... 150
Pneumatic-Electric Relay Control ........................................................................... 150
Pneumatic Recycling Control .................................................................................. 151
Pneumatic Centralization .................................................................................................................................. 152
Pneumatic Control System Example .................................................................................................................................. 153
Start-Stop Control Sequence .................................................................................. 153
Supply Fan Control Sequence ................................................................................ 155
Return Fan Control Sequence ................................................................................ 155
Warm-Up/Heating Coil Control Sequence .............................................................. 156
Mixing Damper Control Sequence .......................................................................... 157
Discharge Air Temperature Control Sequence ....................................................... 157
Off/Failure Mode Control Sequence ........................................................................ 157
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