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Fig. 4—Internal schematic and typical hookup diagram for systems with separate heating and cooling
transformers.
H1
ANTICIPATOR
The FAN switch controls fan operation as follows:
AUTO: For gas- or oil-fired systems, the fan operates
in response to the plenum fan control in heating; fan
operates in response to the thermostat in cooling.
For heat pump systems, the fan operates in response
to the thermostat in both heating and cooling.
ON: The fan runs continuously.
To switch positions, use thumb and index finger to
slide lever to desired position. Stop switch lever directly
over desired function indicator mark for proper circuit
operation.
TEMPERATURE SETTING
Move 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.
HEAT ANTICIPATOR SETTING
IMPORTANT: This thermostat has an adjustable heat
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 Powerpile
(millivolt) systems.
A current rating is usually stamped in the nameplate of
the primary control. Set the adjustable heat anticipator
indicator to match the value given on the nameplate,
except on thermostats used in systems as shown in Fig. 3.
See Heat Anticipator Settings (Fig. 3 only).
If current rating is not available, proceed as follows to
determine the rating:
1. Turn off power.
2. Wire thermostat, except for connection to W termi-
nal, but do not mount it on the wall.
H1
C1
TEMP. FALL
C1
ANTICIPATOR
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
FAN
SWITCH
ON
AUTO
SYSTEM
SWITCH
COOL
HEAT
OFF
OFF
HEAT
COOL
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 sys-
tem 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 checkout.
NOTE: The heat anticipator may require further adjust-
ment for best performance. To lengthen burner-on
time, move the indicator in the direction of the longer
arrows but not more than one-half scale marking at
a time. To shorten burner-on time, move indicator in
opposite direction.
HEAT ANTICIPATOR SETTINGS (Fig. 3 only)
Heat Pump Systems (for about 3 cycles per hour)
Using 'B' Terminal
Set adjustable anticipator to 130 percent of combined
current draw of compressor and fan relays.
Using 'O' Terminal
Set adjustable anticipator to maximum scale setting.
Limit combined load current of compressor and fan relays
to 0.8 amp, because cooling anticipator provides anticipa-
tion during heat cycle in this hookup.
Gas- or Oil-Fired Systems (Without Auto Fan in Heat)
Set adjustable anticipator to current draw of heat relay or
valve.
3
R
C
FAN RELAY
G
COMPRESSOR
CONTACTOR
Y
R
H
HEAT RELAY
W
M1228
1
L1
(HOT)
L2
1
L1
(HOT)
L2
69-0505B—3
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