Home > HVAC Components > Time Delays - ICM Post-Purge Fan Delay Timers Series 251, 252, 253, 254, 255

Time Delays - ICM Post-Purge Fan Delay Timers Series 251, 252, 253, 254, 255

Adjustable OFF delay timer, controls the circulating fan in heat pump, and AC forced air systems...
The Series 253 provides reliable OFF delay timing in a rugged package. The OFF delay is knob-adjustable from 12-390 sec.
• Knob-adjustable OFF delay: 12-390 sec.
• OFF delay purges ducts of residual air at the end of the heating/cooling cycle
• Helps increase overall system efficiency
• Epoxy-encapsulated circuitry
• Solid state reliability
• Low cost
recognized: E118867 certified: LR 30320
• Controls the circulating fan in heat pump, air conditioning & forced air systems. 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.
• Power must be applied before and during the time delay period. When the initiate contact closes, the load energizes and remains
energized as long as the initiate contact is closed. The time delay begins when the initiate contact opens. At the end of the time
delay period, the load is turned off. If the initiate contact recloses during the time delay period the load remains energized and the
time delay is reset to zero. Removal of input power during the delay turns off the load and resets the time delay to zero. A one
second interrogation delay is provided to avoid nuisance trips due to thermostat bounce or tampering.
Specifications:
Input
• Control voltage: 18-30 VAC
• Frequency: 50/60 Hz
• Power consumption: 2 watts max.
Output
• Ratings: max. 1 amp, min. 40 μa, inrush 10 amps
• Voltage drop: 1.25 V max. @ 1 amp
Time Delay
• Type: knob-adjustable only
• Range: OFF delay: 12-390 sec.
Mechanical Mounting: surface mount using (1) #8 or #10 screw
Environmental
• Operating temperature: -40° to +75°C, -40° to +167°F
• Transient protection: meets IEEE 587 standards for categories A & B without false output or degradation (6Kv 0.5 μs x
100 KHz ring wave)(6Kv 1.2 x 50 μs impulse wave)

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S1-ICM251
PART #: ICM251 - RELAY FAN
Usually Ships in 2 to 3 Business Days

List Price: $40.89
Our Price: $26.62
Savings: $14.27
S1-ICM253
PART #: ICM253 - RELAY FAN
Usually Ships in 2 to 3 Business Days

List Price: $42.11
Our Price: $27.42
Savings: $14.69
S1-ICM254
PART #: ICM254 - RELAY FAN
Usually Ships in 2 to 3 Business Days

List Price: $37.00
Our Price: $24.09
Savings: $12.91
S1-ICM255
PART #: ICM255 - RELAY FAN
Usually Ships in 2 to 3 Business Days

List Price: $32.00
Our Price: $20.83
Savings: $11.17