Armstrong World Industries HWC PREMIER 183 - Manual (Page 30)

SPECIFICATIONS Magic-Pak: HW/HWC
2-20
SRM-HW/HWC 2/99
5. The circulating air blower shuts off approximately
90 seconds after G terminal on the blower control
board is de-energized (see note below).
FAN ON
Low Voltage
1. When the switch on the thermostat is moved to the
“FAN ON” position, a 24-volt signal is sent to G .
2. With G energized, the blower control board starts
a countdown to fan “on”. After approximately 15
seconds, the fan starts (see note below).
3. The blower control board closes a relay on the
board, sending line voltage to the terminal marked
COOL on the board. This starts the circulating air
blower .
4. When the switch at the thermostat is moved to the
“OFF” position, the 24-volt signal to the blower
control board is interrupted. With no signal at the
G terminal, the blower control board starts a
countdown to fan “off”. Approximately 90 seconds
later, a relay on the
blower control board opens
(see note below). This interrupts the power to and
stops the
circulating air blower .
Note: Heatcraft blower control boards have a G “on”
delay of 15 seconds and an “off” delay of 90
seconds.
Tridelta blower control boards have no
“on” time delay and a 60 -130 second “off” delay.