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2. In new installations, run wiring (if necessary) to
the thermostat location.
3. Connect the wires to the terminals on the back of the
thermostat. For internal schematic diagram, see Fig. 2.
Fig. 2—Thermostat internal schematic
R
COOL
OFF
HEAT
FIELD WIRING CONNECTION
1
JUMPER 1 TO Y WITH INCLUDED JUMPER FOR AUTOMATIC
FAN IN COOLING MODE ONLY.
2
JUMPER 1 TO 2 WITH INCLUDED JUMPER FOR AUTOMATIC
FAN IN HEATING AND COOLING MODE.
NOTE: IF JUMPER IS NOT MADE TO EITHER Y OR 2, THEN NO
AUTOMATIC FAN WILL OCCUR IN EITHER HEATING OR
COOLING MODE. (G IS NOT AFFECTED BY THIS.)
4. Remove thermostat cover by pulling outward on
right edge of cover until it snaps free of the thermostat
base. Carefully remove and discard the foam plastic
shipping insert that protects the switch and bimetal
assembly during shipping.
5. Set the adjustable heat anticipator indicator to
match the current draw of the primary heating control
(see Heat Anticipator Setting).
6. Push excess wire back through the hole and plug
any opening with insulation to prevent drafts that may
affect thermostat performance.
7. Loosely fasten the thermostat (with wallplate, if
applicable) to the wall or outlet box with a screw through
the left mounting hole. Adjust the thermostat so that it is
approximately level and fasten the second screw through
the right mounting hole. Do not tighten.
8. For optimum performance, level the thermostat
using a spirit level or plumb line. Tighten the mounting
screws.
9. Replace the thermostat cover.
IMPORTANT: An incorrectly leveled thermostat will
cause the temperature control to deviate from
setpoint.
69-1585
ON
FAN
G
AUTO
1
COOL
Y
OFF
HEAT
W
O
4.7 K COOL
ANTICIPATOR
COOL
HEAT
.18 - 1.0
HEAT
ANTICIPATOR
2
B
TEMPERATURE SETTING
Push the temperature setting lever to the desired
control point on the temperature scale. The same lever
controls the temperature setting for either heating or
cooling.
SYSTEM AND FAN SWITCHING
1
This thermostat features SYSTEM and FAN switches
for control of the heating-cooling and fan systems.
The SYSTEM switch controls system operation as fol-
lows:
COOL: Cooling system only operates.
HEAT: Heating system only operates.
2
OFF: Both heating and cooling systems are discon-
nected.
The FAN switch controls fan operation as follows:
AUTO: With terminals 1 and 4 jumpered, fan oper-
ates in response to the thermostat in cooling; fan
operates in response to the plenum fan control in
heating. With terminals 1 and 2 jumpered, fan
operates in response to the thermostat in heating
and cooling. Jumper is included with thermostat.
ON: The fan runs continuously.
To switch positions, use thumb and index finger to
slide lever to desired position. Switch lever must stop
directly over desired function indicator mark for proper
circuit operation.
HEAT ANTICIPATOR SETTING
IMPORTANT: This thermostat has an adjustable heat
M8917
anticipator and will operate properly ONLY IF
THE ANTICIPATOR IS ADJUSTED TO MATCH
THE CURRENT DRAW OF THE PRIMARY CON-
TROL. Use this thermostat only on systems with
current draws that fall within the range of the heat
anticipator. Do not use this device on millivolt
systems.
A current rating is usually stamped in the nameplate
of the primary control. Set the adjustable heat anticipa-
tor indicator to match the value given on the nameplate.
If current rating is not available, proceed as follows
to determine the rating:
1. Turn off power.
2. Wire thermostat, but do not mount it on the wall.
3. Connect ammeter between W wire and W terminal
on the thermostat (in series with the primary control).
4. Prepare the system for operation.
5. Turn on power.
6. Turn system switch to heat.
7. Increase thermostat setpoint as necessary to get
system operating.
8. With the system operating through the ammeter,
wait one minute, then read the ammeter.
9. Turn the system switch to OFF, and turn off power.
10. Adjust the heat anticipator to match the reading on
the ammeter.
11. Disconnect the ammeter, reconnect the W wire,
and mount the thermostat. Continue with system check-
out.
2
Setting and Adjustment
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