ICM Controls ICM251 Installation guide

ICM Controls
Brand
ICM Controls
Model
ICM251
Type
Installation guide
ICM
251
POST PURGE TIMERS
CTVR
SPECIFICATIONS
Input
•Voltage: 18-30 VAC
•Frequency: 50-60 Hz
Output Ratings
• RelayContacts
 –N.O.: 20 amps @ 240 VAC
 –N.C.: 10 amps @ 240 VAC
Time Delays (Adjustable Only)
• ONDelay: 1-180 seconds
• OFFDelay: 12-390 seconds
INSTALLATION
1. Disconnect power.
2. Connect terminals as shown in the
wiring diagram below.
3. Select desired delay on make and
delay on break periods.
4. Reapply power, check operation.
• ON delay lets air reach proper level prior to energizing fan
• OFF delay purges ducts of residual air to increase efficiency
MODE OF OPERATION
Power must be applied at all times. Upon
closure of the initiate switch 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 initiate switch opens, the delay on break
period begins. Once complete, the load is
de-energized and all time delays reset. If the
initiate switch recloses during the delay on
break period, the load remains energized
and the delay on break period is reset.
Removal of the input power resets all timing
functions. Should the initiate switch open
during the delay on make period, the delay
on make period is reset to zero.
Limit Switch: Continuous ON when opened.
If the initiate switch is open when the limit
switch closes, the delay on break period
times out and the load is de-energized.
WIRING DIAGRAM
Untimed Load
Initiate
Switch
R
C
Limit
Switch
PF
PSSS
SF
24
VAC
Input
120-240 VAC
COM
NC
NO
G RC
L
High Power, On Delay
Off Delay Fan Control
for HVAC Systems
7313 William Barry Blvd.
North Syracuse, NY 13212
ICM CONTROLS 800.365.5525
www.icmcontrols.com LII015-1
  • Page 1 1

ICM Controls ICM251 Installation guide

ICM Controls
Brand
ICM Controls
Model
ICM251
Type
Installation guide
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