Nordyne MS3BC018KA Installation Instructions download (Page 5 of 8)

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Manual type:Installation Instructions
Pages:8
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Page 5 of 8
Usingextremecaution,
applypowertotheunit
andinspectthe wiringfor evidenceof open,
shorted,and/orimproperlywiredcircuits.
Functional
Checkout:
CAUTION:
If
equipped
with
a
compressor
crankcase
heater,
wait 24
hours
prior to
performing
a
function
checkout
to allow
for
heating
of
the
compressor
crankcase.
Failure to comply may result
in damage
and could
cause
premature
failure
of the system.
Indoor
Blower
--
Set the thermostat
function
switch to COOLING
and the fan switch to ON.
Verify
that the indoor
blower
is operating
and
that airflow is not restricted.
Set the fan switch
back
to AUTO.
Low-Pressure
Switch
--
A
low-pressure
switch
is
factory-installed
in
select
models
only.
If provided,
this switch
is located
in the
suction
line
internal
to the outdoor
unit. The
switch
is designed
to protect
the compressor
from
a loss
of
charge.
Under
normal
condi-
tions, the switch
is closed.
If the suction
pres-
sure falls below 5 psig, then the switch will open
and de-energize
the outdoor
unit.
The switch
will
close
again
once
the
suction
pressure
increases
above 20 psig.
Please note that the
switch
interrupts
the thermostat
inputs
to the
unit.
Thus,
when
the switch
opens
and then
closes,
there will
be a 5 minute
short
cycling
delay
before
the outdoor
unit will
energize.
Cooling
--
Gradually
lower
the
thermostat
temperature
setpoint
below
the
actual
room
temperature
and observe
that the outdoor
unit
and indoor blower
energize.
Feel the air being
circulated
by the indoor blower
and verify that it
is cooler
than ambient
temperature.
Listen for
any
unusual
noises.
If present,
locate
and
determine
the source of the noise and correct as
necessary.
Short
Cycle
Protection
(Select
models
only)
--
With the system
operating
in COOL-
ING mode,
note the setpoint
temperature
set-
ting of the thermostat,
and gradually
raise the
setpoint
temperature
until the outdoor
unit and
indoor
blower
de-energize.
Immediately
lower
the setpoint temperature
of the thermostat
to its
original setting and verify that the indoor blower
is energized
and that the outdoor
unit remains
de-energized.
Verify that, after approximately
5 minutes,
the outdoor
unit energizes
and that
the temperature
of the air supplied to the facility
is cooler
than ambient
temperature.
Heating
--
If provided
with heating equipment,
lower
the thermostat
setpoint
temperature
to
the lowest
obtainable
setting and set the ther-
mostat function switch to HEATING.
The indoor
blower
and
outdoor
unit should
stop
running.
Increase
the setpoint
temperature
of the ther-
mostat
to the maximum
setting.
Verify that the
heating
equipment
has been
energized
(i.e.,
fossil
fuel burner
operating,
etc.)
and that the
indoor
blower
energizes
after a short period of
time.
Feel the air being circulated
by the indoor
blower
and verify that it is warmer
than ambient
temperature.
Listen
for any unusual
noises.
If
present,
locate and determine
the source of the
noise
and
correct
as
necessary.
Orifice
Usage
12 SEER
Split
System
Air
Conditioner
Restrictor
System
Charge
Size (In.)
R-22 oz.
Model
Number
1-1/2
Ton
2 Ton
2-1/2 Ton
3 Ton
3-1/2 Ton
4 Ton
5 Ton
0.060
0.063
0.068
0.077
0.085
0.090
0.099
88
96
113
118
125
130
145