Specifications magic-pak: hw/hwc – Armstrong World Industries HWC PREMIER 183 User Manual
Page 18
SPECIFICATIONS
Magic-Pak: HW/HWC
2-8
SRM-HW/HWC 2/99
8.
The 24-volt signal will only be supplied to the
limit
switch
circuit through pin 6 of the 6-pin ignition wire
harness and to the
pressure switch
circuit through
pin 2 of the 6-pin ignition wire harness.
9.
The system will repeat this sequence until the
pressure switch
closes and the 24-volt signal is
restored at pin 5 of the 6-pin ignition wire harness.
FAILED FLAME SENSE/TRIAL FOR IGNITION
When the
pressure switch
closes and a 24-volt signal
is sent to pin 5 of the 6-pin ignition wire harness, the
spark ignition cable
terminal and pin 4 of the 6-pin
ignition wire harness energize.
1.
As spark voltage is supplied to the
ignitor elec-
trodes
, the
gas valv
e opens and this causes the
burners to ignite.
2.
The
ignition control
continues to energize spark
voltage until a flame sense signal is supplied to the
flame terminal on the
ignition control
.
3.
If a flame sense signal is not received at the flame
terminal on the
ignition control
, the
spark igni-
tion cable
terminal remains energized for 10
seconds.
4.
After the 10-second trial for ignition, the
ignition
control
de-energizes the
spark ignition cable
terminal and pin 4 of the 6-pin ignition wire harness.
This causes the
gas valve
to close and the elec-
trode spark to stop.
5.
Once the 24-volt signal is sent to pin 4 of the 6-pin
ignition wire harness, a 30-second
circulating air
blower
“on” delay starts. After the delay is timed
out, the
circulating air blower
starts.
6.
After the
spark ignition cable
terminal de-ener-
gizes, the
ignition control
initiates a 30-second
combustion blower
inter-purge delay.
7.
After 30-second inter-purge, the
ignition control
energizes the
spark ignition cable
terminal and
pin 4 of the 6-pin ignition wire harness. If the flame
sense signal is received at the flame terminal of the
ignition control
, the unit continues heat call.
8.
If the flame sense signal is not received, the system
goes through three trials following the above
sequence.
9.
After three trials, the system goes into lockout and
only the
high limit switch
circuit and
pressure
switch
circuit remain energized during the 60-
minute lockout period.
10. If the flame sense is lost during the heat cycle, the
gas valve
de-energizes immediately and the
system goes into the trial sequence.
CALL FOR COOLING
Line Voltage
1.
L2 power passes through the fixed closed
L2-T2
terminals on the
contactor
to the
RUN
terminal of
the
compressor
and the
COMMON
terminal of the
capacitor
.
2.
L1 power is sent to the
L1
terminal of the
contactor
.
When the
Y
signal energizes the
contactor
, the
T2
terminal becomes energized. L1 power is sent to
the
compressor
COMMON
terminal and the
condenser fan
. This energizes the
compressor
and
condenser fan
motors.
3.
When pin 1 (
Y
terminal) of the 5-pin thermostat
harness receives a 24-volt signal from the
thermo-
stat
, a 5-second
circulating air blower
delay
starts.
4.
After the 5-second delay, the
ignition control
energizes the cooling speed relay. This sends L1
power to the
ACB COOL
terminal of the
ignition
control
.
5.
L1 power is sent to the
circulating air blower
terminal block, energizing the
circulating air
blower
motor.
6.
When the
R
,
Y
and
G
circuit is interrupted by the
thermostat
, the
contactor
is immediately de-
energized. This interrupts L1 power to the
com-
pressor
and
condenser fan
motors, stopping
both.
7.
The
ignition control
starts a 90-second
circulat-
ing air blower
“off” delay, after which the
ACB
COOL
terminal de-energizes. This interrupts L1
power to the
circulating air blower
motor, causing
it to stop.
Low Voltage
1.
The
thermostat
energizes the
R
,
Y
and
G
circuit,
sending a 24-volt signal to the
contactor
coil and to
pin 1 of the 5-pin thermostat harness connected to
the
ignition control
.
2.
The
contactor
closes immediately upon receiving
the 24-volt signal, causing the
compressor
and
condenser fan
motors to start.
3.
The 24-volt signal is also sent to pin 1 of the 5-pin
thermostat harness, initiating a 5-second
circulat-
ing air blower
“on” delay.
4.
After the 5-second delay, the
ignition control
energizes the cooling speed relay and the
circulat-
ing air blower
starts.
5.
When the cooling call is satisfied, the
thermostat
interrupts the
R
,
Y
and
G
circuit. The
contactor
de-energizes immediately, causing the
compressor
and the
condenser fan
to stop. The
ignition
control
starts a 90-second
circulating air blower
“off” delay.