Specifications magic-pak: hw/hwc – Armstrong World Industries HWC PREMIER 183 User Manual
Page 40
SPECIFICATIONS
Magic-Pak: HW/HWC
2-30
SRM-HW/HWC 2/99
3.
The unit continues cooling as long as both
Y
and
G
are energized. When the cooling call is satisfied,
the circuit between
Y
,
G
and
R
is interrupted. The
contactor
immediately opens, interrupting power to
the
compressor
and the
outdoor cooling fan
.
4.
With the low voltage signal to terminal
G
on the
blower control board
interrupted, the board starts
a countdown to blower “off”. After approximately 90
seconds, the cooling speed relay opens and the
circulating air blower
shuts down (see note at the
end of this section).
Low Voltage
1.
On a call for cooling, the
thermostat
closes the
circuit between
R
and terminals
G
and
Y
.
2.
The 24-volt signal energizes terminal
G
on the
blower control board
, starting the fan “on” timer.
After approximately 15 seconds, the relay closes
(see note at the end of this section). This sends line
voltage to the
COOLING
speed terminal on the
board, which starts the
circulating air blower
.
3.
The signal from
Y
energizes the
contactor
, starting
the
compressor
and the
outdoor cooling fan
.
4.
When the cooling call is satisfied, both
G
and
Y
de-
energize. The
contactor
opens immediately,
causing the
compressor
and the
outdoor cooling
fan
to stop.
5.
The
circulating air blower
stops approximately 90
seconds after the
G
terminal on the
blower control
board
de-energizes (see note at the end of this
section).
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 the
G
terminal on the
blower control board
.
2.
With
G
energized, the
blower control board
starts
a countdown to fan “on”. Approximately 15 seconds
later (or immediately - see note at the end of this
section), the fan starts.
3.
The
blower control board
closes a relay on the
board, sending line voltage to the terminal on the
board marked
COOL
. 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 at the end of this section). 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.