251 ICM POST PURGE TIMERS

251 ICM  POST PURGE TIMERS
High Power, On Delay
Off Delay Fan Control
for HVAC Systems
ICM 251
POST PURGE TIMERS
•ON delay lets air reach proper level prior to energizing fan
•OFF delay purges ducts of residual air to increase efficiency
CTVR
SPECIFICATIONS
MODE OF OPERATION
Input
•Voltage: 18-30 VAC
•Frequency: 50-60 Hz
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.
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.
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
C
Untimed Load
Initiate
Switch
C
COM
SF
R
L
PF
Input
120-240 VAC
24
VAC
NO
NC
G
SS
PS
Limit
Switch
R
ICM CONTROLS
www.icmcontrols.com
7313 William Barry Blvd.
North Syracuse, NY 13212
800.365.5525
LII015-1
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