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YOUR HONEYWELL THERMOSTAT
Your new Honeywell CT50A Heating Thermostat will replace most 15
to
30 V,
2-wire
heating system thermostats. The CT5OA will control most gas or oil heating systems
(NOT for heating/cooling or heat pump systems).
Your new Honeywell CT51A Heating/Cooling Thermostat will replace most 15 to
30
V.
4-wire, heatingkooling system thermostats. The CT51A is suitable only for
gas
or oil
heatingkooling systems (NOT for heat pump systems).
Your new Honeywell CT53A Heating Thermostat is suitable for 250,500 or
750
millivolt
(mV) heating systems only.
WIRE AND MOUNT
-NEW THERMOSTAT
-
3
Connect one of the 2 wires from the wall
to
each of the
two
terminals on the back
of the thermostat. Tighten the screws.
Connect4wires from thewall to matching terminalson backof thermostat.Tighten
the screws.
CAUTION
Connect wires to
R
and W for 750 mV systems. CQnRect to R and Y
P a r 250 or 500
Grasp the thermostat cover at the top and bottom with one hand. Pull
outwardon the topedgeofthe thermostatcover until itsnaps freeofthe thermostat
Carefully remove and discard the red plastic pin located above the mercury switch.
This pin protects this switch during shipment.
Fasten thermostat
to
the wall with one of the screws supplied, using the top
Place your level across the top of the
level it. Start the second
screw,
supplied, in the center of the bo
Ole.
Recheck for level positioning then firm1
ounting screws.
0
mV systems. Tighten the screws.
Q.
0
I7
1
mounting hole.
If Installing CT50A, CT5lA
MAKE SURE you have the current (anticipator setting) for your system.This is the
number you wrote in the box in step 2. If you were unable
to
find the current draw
P
or step 2 this information can be found printed on the primary control at the furnace.
The primary control is usually a gas valve, zone valve, or a relay or burner control box
with the thermostat wires connected
to
it.
(See
illustrations O f 3 types of primary controls
below).
On the CT50A CTSlA
TERMINAL SCREWS
ICTSlA SYOWN\
TOP MOUNTING HOLE
ADJUSTABLE HEAT
ANTICIPATOR SETTING LEVER
(CT5OA, CT5lA ONLY)
MOUNTING CLIPS
(FOR COVER)
FAN SWITCH
(CT51A ONLY)
SYSTEM SWITCH
(CT51A ONLY)
OIL BURNER CONTROL
BOTTOM MOUNTING HOLE
TEMPERATURE SETTING LEVER
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