Install Instructions

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APP LICATION/D
E
SC
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O
N
Ranco's C12-2ffi1control
is
an adjustable
thermostat
which
tolds bacK
additional
stages of supplemental
heat
until the outdoor temperature
falls
below the
control's
setpoint. There are
many ways in which
the
control can be
wired into
the
system. However, the
C12-2001
is
typically
wired through the relay circuit in
conjunction
with
the
indoor
thermostat.
Most indoor
thermostats
used with heat
pumps
willcomplete a cir-
cuit
to the supplemental
heat if
the
indoor
temperature
drops
approximately 2"F or
more
below the indoor
thermostat's
setting.
The"C1? series controls utilizes a SPDT snap-action
switch.
Terminal
numbers
1
and
2
are
normally
closed
and open
with a
decrease
in temperature. Terminal
numbers
2
and 3 close with a decrease
in
tempera-
ture.
Gl2-2001
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INSTALLATION
There are two types: A)
Replacement
B) Retrofit
A)
Replacing
and existing
"hold-back" thermostat.
Disconnect electrical
power.
Remove
inoperative
control
noting terminal
wire
connections
and
placement
of control's
capillary and bulb.
Install replacement controlcapillary
and bulb
in same manner
as original control.
Goil
excess
capillary
in
a 3"
diameter and secure
in
a location
where it will not interfere
with
electrical wiring.
1.
2.
4.
Bulletin No. 1531072