194
Electrical
OFF Delay Only Fan Control
Part #
Features & Applications
Specifications
Cross Reference
24-ICM253
• UL 873 recognition for compressor applications.
• Post-purge fan delay timer.
• OFF delay purges ducts of residual air at the
end of the heating/ cooling cycle.
• Interrogation delay eliminates nuisance trips
due to thermostat bounce/ tampering.
• Control: 18-30 VAC.
• 1 amp.
• 10 amp inrush.
• Adjustable time delays: 12
to 390 sec.
Gemline
• IC216
Mars
• 32393
To Bypass A Switch Or Device During Startup
Part #
Features & Applications
Specifications
Cross Reference
24-ICM175
• Designed to bypass a low pressure switch or
other device during start-up.
• Ideal for low ambient start-ups.
• Key component for "winter start" kits.
• Helps to reduce nuisance lockouts.
• Universal AC voltage operation.
• Knob-adjustable time delays.
• Epoxy-encapsulated circuitry.
• Compact 2" × 2" package.
• Control: 18-240 VAC.
• Frequency: 50/ 60 Hz.
• 1 amp maximum.
• 40 mA minimum.
• 10 amp inrush.
• Knob-adjustable time
delays: 10 to 1,000 sec.
Mars
• 32395
Supco
• TDP68
Bypass Timer
Applications
Timing Diagram
Mode Of Operation
• "On delay interval timer"
• "Normally closed delay on make"
• Designed to bypass a control or device
during startup. Typically used to bypass
a low pressure switch during compressor
heat pump startup or to bypass an oil
pressure switch upon startup. Helps to
eliminate nuisance lockouts.
• With power applied to the input, the load
energizes immediately and remains
energized for the length of the time delay,
regardless of the state of the switch being
bypassed. At the end of the time delay, the
condition of the load is determined by the
state of the switch.
OFF Delay Timing Purges Residual Air
Applications
Timing Diagram
Mode Of Operation
• "OFF delay ON break"
• Controls the circulating fan in
heat pump, air conditioning &
forced air systems. OFF delay
allows conditioning air to reach
the proper comfort level prior
to energizing the fan, helping
to ensure comfort. OFF delay
timing function continues to
run the fan at the end of the
heating/ cooling cycle, thereby
purging ducts of residual air and
increasing system efficiency.
Fan Blower Controls
Continued - Next Page!
• Power must be applied before & during time delay
period. Upon closure of thermostat the delay on
make period begins. Once complete, the load
is energized, and remains energized as long as
the initiate switch is closed. When the thermostat
switch opens, the delay on break period begins.
Once complete, the load is de-energized and all
time delays reset. If the initiate contact recloses
during the delay on break period, the load
remains energized and the delay on break period
is reset. Removal of input power resets all timing
functions. Should the initiate contact open during
the delay on make period, the delay on make
period is reset to zero.
Fan Blower Controls
Solid State Components
