Manual 2100-467K
Page
17 of 24
three Phase scrOll cOmPressOr
start uP InFOrmatIOn
(Models PA13362-B; PA13422-B, -C; PA13482-B, -C;
PA13602-B, -C)
All units with three phase scroll compressors are
equipped with a three phase line monitor to prevent
compressor damage due to phase reversal.
The phase monitor in this unit is equipped with two
LED’s. If the “Y” signal is present at the phase monitor
and phases are correct, the green LED will light.
If phases are reversed, the red fault LED will be lit and
compressor operation is inhibited.
If a fault condition occurs, reverse tow of the supply
leads to the unit. Do not reverse any of the unit factory
wires as damage may occur.
sequence OF OPeratIOn
blOWer OnlY
– When the “Fan” switch on the
room thermostat is placed in the “On” position (circuit
R-G makes), the blower will energize and run until the
“Fan” switch is placed back into the “Auto” position.
This will allow for constant air circulation at a lower
airflow during times when the unit is not in operation
for cooling or heating.
cOOlInG
– On a call for cooling from the room
thermostat (circuit R-Y makes), the blower will
energize (circuit R-G is automatic when R-Y makes) as
well as the compressor, and outdoor fan motor. Note
that if the “Fan” switch on the room thermostat is in the
“On” position and the blower is already in operation,
then the motor will ramp up to the required speed for
cooling.
heatInG (1st stage)
– On a call for heating
from the room thermostat (circuit R-W1 makes), the
blower will energize (circuit R-G is automatic when
R-W1 makes). This will place the system into heating
operation to maintain the thermostat set temperature.
Note that if the “Fan” switch on the room thermostat
is in the “On” position and the blower is already in
operation, then the motor will ramp up to the required
speed for heating.
heatInG (2nd stage)
– If the operation of the 1st
Stage electric heaters will not maintain the set room
temperature, then the thermostat will call for additional
heat to help maintain the set temperature. On a call
for second stage heating from the room thermostat
(circuit R-W2 makes), additional electric heaters will
be energized if installed.
InDOOr blOWer mOtOr
These models feature a variable speed (ECM) motor
providing high efficiency, low sound levels and soft
start capabilities. The motor is self adjusting to provide
the proper airflow rate at duct static pressures up to
0.50" WC without user adjustment or wiring changes.
On command from the wall thermostat the motor will
start slowly and ramp up to full speed over a period of
10-15 seconds.
When the thermostat is satisfied the blower will operate
for approximately 1 minute, and then slow down and
stop.
cOmPressOr cOntrOl mODule
The compressor control is an anti-short cycle/lockout
timer with high and low pressure switch monitoring and
alarm output.
aDJustable DelaY-On-maKe anD breaK
tImer
On a call for compressor operation the
delay-on-make
period begins which will be 10% of the
delay-on-
break
setting. When the delay-on-make is complete
and the high pressure switch (and low pressure switch
if employed) is closed, the compressor contactor is
energized. Upon shutdown, the delay-on-break timer
starts and prevents restart until the delay-on-break and
delay-on-make periods have expired.
hIGh Pressure sWItch anD lOcKOut
sequence (standard Feature)
If the high pressure switch opens, the compressor
contactor will de-energize immediately. The lockout
timer will go into a
soft lockout
and stay in soft lockout
until the high pressure switch closes
and
the delay-
on-make time has expired. If the high pressure switch
opens again in this same operating cycle the unit will
go into
manual lockout
condition and the alarm circuit
will energize. Recycling the wall thermostat resets the
manual lockout.
start uP anD OPeratIOn
