Install Instructions

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Bulletin No. 1531064-4
RANSG@
DESC R I PTIO I\UAPP LICATION
RANCO
A10
control is
used
in
applications where Fl-A
requirements
DO NOT
exceed 16 amp
@ 120/240VAC.
Switch is SPST.
RANCO A30 control is used in applications
where FLA
requirements DO NOT exceed 20
amps @ 120l24OVAC.
Switch
is
SPST.
RANCO
A22 control
general
is built with a
S
PDT
switch and
can be used to control air conditioning
cooling and heating
circuits. The A22
carries the
following ratings:
Cooling
FLA 20
ampso 12m40
vAc
t
.ol
A22
Single
pole,
double
throw
(SPDT)
J
o '
2-3 close on
rise;
open on drop
=
2-1 close on drop; open
on
rise
fhe
422 may
be built as a SPST switch with either
terminal
l
or3omitted.
CAUTION
To
prevent possible
electrical shock or
equipment damage, disconnect electrical
power
to unit before and during installation.
DO NOT restore
electrical
power
to
unit until
the
control
is
properly
installed
and
grounded.
DO NOT locate the control in an explosive
atmosphere
as a safety
hazard can result due
to
possible
spark
generation
in the control.
Controls are
not to be located in areas of
splashing
water
or enreme
moisture, dirt or dust,
or
in
a
corrosive
or explosive
atmosphere.
These
environments can shorten
control
life-
4.
5.
o. neriluve
uoiluul,
relalililrg
lilE
surews ailu dily
hardware required
for
the replacement.
INSTALLATION
OF
NEW
CONTROL
'
1. Taking
care to not twist the control body secure it
to the
original
mounting.
SENSING ELEMENTS
There
are severalforms of sensing elements
used
on
the A
series, but
there are only two basic types:
limit-
ed
vapor{ill
and
cross ambient.
LIMITED VAPOR-FILL
TYPE
C.pillsy-Typ. Rcmole
Eulb.Typo
Limited vapor-fill sensing elements always
sense
from the coldest section including the control
body if it becomes coldest.
When
sensing an evaporator or similar surface,
make
certain that the
bulb or at least 6" of capil-
lary is in
good
contact
with it. DO NOT crush
or de-
form
the sensing element
when
clamping
it.
Sensing may be improved
by
insulating
the sens-
ing section
and area
from
the environment.
v
Air
C<il
.'#l
lD-
1.
2.
A1OIA22IA3O
SERIES
r
)
DIRECT
REPLACEMENT
'
coNTRoLS
PREINSTALLATION
STEPS
1.
Disconnect electrical
power.
2. Refer
to the equipment
manufacture/s service
manual.
3.
Note
position
and
routing
of the control's sensing
element.
Record
the electrical
wire
to
terminal connections.
lf the
sensing
elemenl enters a
pressurized
fitting
or well, cautiously
relieve
the
pressure
and
remove
the
fluid
prior
to
removal
of the control.
Rcmote
Eulb.Typo
OVER