SET HEAT ANTICIPATOR
Set anticipator to match the setting of your old thermostat you
noted in Step 3, or, the anticipator should be set to match the
current rating stamped on your main heating control. The heat
anticipator is adjustable from 0.15 to 1.2 amps. Adjust the
anticipator by rotating the contact arm (see fig. 5). The anticipator
setting is indicated by the numbers on the base that the pointer
points to. If you are unsure where to set the anticipator contact
the heater manufacturer for a recommended setting.
Move the pointer
counterclockwise to lengthen
heating system
cycles; move
clockwise to shorten
heating cycles. Adjustments
should not be greater than 1/2 marking at a time.
Snap on Cover:
Carefully align the cover with the base and
snap the cover onto the base.
NEW THERMOSTAT OPERATION
1C20 Heat Only –
After power is turned on, slide temperature
lever to desired setting. To turn heat off, slide lever all the way
to the left until it clicks.
1C26 –
This thermostat is easy to operate. Fig. 6 shows how the
heating/cooling system and fan operate when the switches are
in various positions. After power is turned on, use the system
switch to select either heating or cooling, or to turn the heating/
cooling system off. Use the fan switch to control fan operation.
When the fan switch is in the
AUTO
position, the fan will cycle
with the heating or cooling system (the fan will not run if the
system switch is in the
OFF
position and the fan switch is in the
AUTO
position). When the fan switch is in the
ON
position, the
fan will run continuously, regardless of system switch position
(even if the system switch is set to
OFF
, the fan will run if the
fan switch is in the
ON
position).
ELECTRICAL DATA
Switch Rating
........................ 24 VAC (30 VAC max.)
Heating ................................... 0.15 to 1.2 Amps
Cooling ................................... 0 to 1.5 Amps
Switch Action
........................ Snap Action
Anticipator Rating:
Heating ................................... Adjustable from 0.15 to 1.2 Amps
Cooling ................................... Fixed
SPECIFICATIONS
THERMAL DATA:
Temperature Range
............... 50°F to 90°F (10°C to 32°C)
Operating Humidity Range
... 0 – 90% noncondensing
5
6
7
FAN
AUTO ON
SYSTEM
COOL OFF HEAT
Shows switch position
OPERATION
No heating; no cooling; no fan
No heating; no cooling; fan runs continuously
Cooling system cycles from thermostat; fan runs
continuously
Cooling system and fan cycle from thermostat
Heating system cycles from thermostat; fan cycles
from fan control on furnace
Heating system cycles from thermostat; fan runs
continuously
Figure 6. Subbase switching and thermostat/system
operation (1C26 only)
24VAC
50/60 Hz
.43 Amps
Typical Oil Primary
24VAC
50/60 Hz
.35 Amps
Typical Zone Valve
Figure 5. Anticipator adjustment
Rotate contact arm
to adjust heat anticipator
Arrow points to the
current rating of
the primary coontrol
NOTE
For Milivolt Application:
Rotate contact arm
to rest on this rivet.
